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 GPS Receivers for PDAs and PCs
 Holux GPSlim 236 Reset HowTo + Pictures

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T O P I C    R E V I E W
cpqkgpsa Posted - 26 déc. 2005 : 06:12:08
Resetting Holux 236

I have recently opened my 236 unit to reset it and took some pictures for those who are interested.

Why? After synchronizing protocol and baud rate through the SiRFDemo utility my 236 would only send unrecognizable byte sequences over the Bluetooth connection. There was no way of resetting the protocol or baud rate with any software. I verified the raw output format was not in the Sirf binary protocol as some posts in this forum suggested.
The most likely reason for this behavior was that the Sync feature had set the Sirf chipset to a baud rate that exceeded the 236's builtin Bluetooth radio's capabilities. In this situation a software reset is probably only possible via a separately sold special USB cable. (A standard USB cable will not work).
Living in a place where obtaining such a cable would incur higher costs and a longer waiting time, I had to find another way to reset the unit.

After failed attempts to cause a reset by running down the internal buffer battery for several days (removed big battery), the best solution seemed to open the unit and physically reset the internal ram.

The biggest challenge was to find a way to open the case. After some trial and error (need strong finger nails), the unit opened from the side of the USB connector. You should be able to get a better understanding of the connecting mechanism from the pictures below.

Originally my intention was to unsolder one of the backup battery pins to reset the 236. However there is a faster way: the battery pins are very close together and after causing a short-circuit by connecting both pins for a fraction of a second, the unit was already reset! Although it would be preferable to cause a voltage loss by unsoldering the battery, causing a quick short-circuit should not damage the battery.

Hope the pictures are helpful to anybody in the same situation.

Cheers. Chris


Remember: Never use the "Synchronize Protocol & Baud Rate" menu option in SiRFDemo with the 236 connected via Bluetooth.












Update:

There is another common problem with the 236 which cannot be solved with the technique above. If your GPSlim236 has trouble to start or maintain a Bluetooth connection (Blue LED permanently OFF) then the following might help:

Open the case as described and press down the area indicated in the following picture, while you turn on the device. You might need to keep it pressed for a longer time if the blue light goes off again instead of blinking.
JayW has come up with this effective solution, which is however only a temorary remedy. He further suggests that soldering some PCB connections on the mainboard will permanently fix the problem.
There have also been suggestions that putting the unit into a refrigerator or near the aircondition can temporarily get the Bluetooth to life, however resoldering seems to be the first solution that would permanently fix the problem.



Remember that any surgery you perform on the 236 will most likely void your warranty. So if you still have warranty I would recommend to return the device and describe the erratic error. Make sure the 236 is tested over a longer time if they cannot immediately reproduce the problem, as some users stated they have been returned their defective unit as "functioning" since it would work flawlessly when tested by the seller.

Have a look at this thread for more information:
http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=64581#389452

Good Luck
91   L A T E S T    R E P L I E S    (Newest First)
macformat Posted - 07 mai 2012 : 07:35:04
hello do you have a diagram of the usb cable and if that worked?

thank you
quote:
Originally posted by txl

Hello all,

Of course I played with sirfdemo and of course I screwed up the unit...

But I have the data cable so is there a way to make it come back "from the dead" with the cable ?

Thanks a lot

TheHun Posted - 06 déc. 2008 : 11:20:46
JFYI, if you don't charge the GPSlim240 frequently, the Li-Ion goes below 2.4V real fast ( 6 months in my case ) and after that you can throw it away... Or do what I did : http://www.vassfamily.net/projects/GPSlim240/GPSlim240BatterFix.html
bbloff Posted - 02 août 2008 : 17:21:57
Update: The GPSlim 236 can run from external power with battery removed, had someone email me this information.

Would someone be able to quickly tell me (test) if the GPSlim 236 can operate from external power when battery is removed? I have the Holux M1000, I can remove the battery, leave the slide switch on, and have it auto power on/off with car or charger connection. Just wondering if this model can do the same thing, as I'm having stability issues with the M1000 (frequent drop outs). Many receivers (such as i-blue 737) simply won't turn on without a battery..
Cheers
wallacel Posted - 23 juin 2008 : 05:53:45
Me too. For those who have trouble after flashing via BT, my 236 was dead after flashing firmware 3.2.2. After resetting it comes alive again, thanks alot Chris!
sur_king Posted - 29 sept. 2007 : 06:36:32
Today, i experimented SirfIII Demo with my Holux gpslim 236 and got screwed up. I don't think that changing from NMEA to Sirf will make the unit unable to work! I go through SirfIII Demo and Holux manual and experimented changing many parameters in SirfIII Demo. But everything went vain and my GPS was not responding.

I thought that my GPS was almost dead and think of returning to the shop where i purchased. But when i google it, i find out this useful topic in this forum. I followed the reset procedure mentioned by Chris. Couple of times, i didn't get proper contact. But atlast, i just kept short circuiting for around 10 secs. Oh God! my GPS resets successfully and now its working fine.

I joined this forum particularly to thank Chris. Thank you very much Chris. A wonderful post!!!
spitz Posted - 05 août 2007 : 11:19:52
The hard-restart works flawless, the pins have to be shortened for about 5 secs.
Versions of Sifrdemo > 3.8 seem to me causing such a great mess. With 3.75 everything is ok.

After the restart I've noticed a strange behavior - with 5 locked sats. the longtitude is about 50 meters off the right position. After the restart yesterday the weather is really bad, but I don't think might be causing big difference.
kuzmewnko Posted - 11 juil. 2007 : 02:40:43
Could u plase send me this pictu
cford88 Posted - 06 juil. 2007 : 16:35:52
I also have a 236 but I have a different issue. I left the unit in the car for a while when it was cold and the battery died. Now I can't seem to get a fix on any satellite. I have done the reset and I can see data being transmitted to the PDA from the device usning SirfTech and GPSView but it will not lock. Does anyone have any information on what my problem could be or what I could try to get this thing working.
palmer74 Posted - 02 juil. 2007 : 11:31:39
Bonjour à tous,

Le 236 que j'ai acheté sur ebay souffrait de bugs incompréhensibles, après recherche sur tous les forums, il m'est apparu que ce n'était qu'une question de température. Après perçages de trous dans la coque : aucun changement.

Alors, pourquoi ne pas utiliser le système des PC ? Je ne parle pas d'y mettre un ventilateur ! lol mais d'y fixer un radiateur.
Ouverture de la coque, pas facile, faut forcer *, (et perte du bouton M/A), extraction de la carte, identification du proc' GPS (236) et collage dessus d'une petite plaque de laiton d'environ 2/3 mm d'épaisseur et de dimensions adéquates (découpe, limage).
Résultat : PLUS AUCUN PROBLEME.
A vos étaux ...

* Merci à cpqkgpsa pour les photos
dice336 Posted - 07 juin 2007 : 00:22:19
Thanks for the info.
bartn Posted - 02 juin 2007 : 00:24:30
I can attest that the new Holux GPSlim 240 model suffers from the same problem. I too tried to switch it to the binary Sirf protocol over bluetooth, from which moment I couldn't get it to work with any program. Since this model is much smaller and has a nice, slick casing, I won't be opening it up. I'll attempt the fridge technique and report what happens. I'll have to let it drain its main battery first, though, since that one cannot be removed in this model. I'll be getting a data cable sometime anyway, so if this fails I'll just have to do that sooner.
ron2000uk Posted - 09 mai 2007 : 05:09:47
Am I right in assuming that all the people who messed up the 236 was because of using SirfDemo over BT?
I use USB cable and fiddle with various settings. It lock up often but I can always reset it.
Does any mess up the GPS with a USB cable? (a proper one, not the supplied USB cable which is only for charging)
admin_0 Posted - 26 avr. 2007 : 04:56:45
Hi guys, I too have a Holux 236. I've had it for about 2 months I guess, and it has worked flawlessly until today. I used it with my Motorola Q to navigate to a client location, turned it off, did my work for about 2 hours. When I got back to the car, I turned it on to navigate to another site, but it would not pick up on my Q. The LEDs looked fine... the orange would blink, and the blue would blink quickly, and then slowly as I started my GPS app, but it could not detect a GPS signal. So I think it was connecting via BT, and according to the LED it had a lock, but it was not relaying any info for some reason.

So I took it home and plugged it into the PC via the provided USB cable (after I installed the drivers from the CD). And it would pop up the USB icon in the system tray, and it would disappear and re-appear constantly. I managed to click on it once before it disappeared and it said something about an unknown USB device, even though I am certain I installed the correct drivers.

So anyway, I tried the battery short reset method, and had no luck. I can still see the device via BT, pair it, connect to it, etc., and even thought the orange LED blinks, I get no GPS data from it. So I've removed the main batt and put it in my subzero freezer for the night. Hopefully that fixes it...
admin_0 Posted - 21 mars 2007 : 00:48:18
I accidentally let the battery die on my GPS unit, but oddly not in any SIRF mode that I know of, just using it as a GPS unit with my Palm using GeoNiche. And most likely GeoNiche was not open and the port closed.. None the less, I discovered it the next day still on and dead so I charged it, and got nothing but gibberish out of it when trying to connect to it.

Popped the case really easy with a jewelers screwdriver (careful! Mine went into the case, luckily there's not much to hit in the front) and put the screwdriver between the battery contacts for 1-2s to reset it. Happy now!

I might pack this screwdriver in my caching box, I'd loathe to get somewhere and realize this has happened again. I was going to grab a cache tonight when I found it. Ah well, it's good now, thanks for the pictures and instructions!
admin_0 Posted - 11 févr. 2007 : 21:38:28
Hi! Your reset procedure worked flawlessly with my Holux 236. I Short(!) Circuited (Through a long thin cable, just to make sure some resistance in the cable and give enough time to drain internal battery safely without damaging the battery) internal Battery for 10 seconds.
Great Help Thanks a Lot.

My problem was: Bluetooth communication with my Laptop and 236 or My Blackberry Pearl and 236 was flawless, Laptop and Blackberry both keep detecting 236 as a Bluetooth device. But Microsoft streets and Trips 2007 or Blackberry Maps failed to detect 236 as a GPS device.

After reseting 236, Now everything fine.
Cheers!
codydoerfler Posted - 22 déc. 2006 : 20:46:42
Dave, thak you so much for all of your help. After a trip to home depot to get a soldering iron and a few attempts at creating the jumper, I know have a fully functioning GPS unit that will never shut off!

Again, thanks for your help, you have saved me lots of money and stress!! Merry Christmas!

Cody
codydoerfler Posted - 22 déc. 2006 : 06:28:33
Yea, I have been messing with that black block that is inside the housing, and it is solid. The scrapes you see are of me trying to get it to move with my exacto knife.
Dave B Posted - 22 déc. 2006 : 06:23:57
You got it!

I would give another try on sliding that piece to the right inside the switch tho. I keep going back to your pic, and it looks like if you scrape, jiggle, or pry a little, it should move. But if not, the jumper points you show are correct for permanently 'ON'.
codydoerfler Posted - 22 déc. 2006 : 06:16:58
So, like this then?

http://home.comcast.net/~codydoerfler/jumper.jpg

Dave B Posted - 22 déc. 2006 : 05:56:20
Let's try this again. Lost all my typing on my last try.

NO! Those holes are the switch alignment holes. You'll have to jumper from the other side, on the back of the switch itself.

My error on the jumper positions, tho. It looks like the top and middle poles. The bottom one might not even be presently soldered.

Use this pic http://img277.imageshack.us/my.php?image=6303custom6qx.jpg
Dave B Posted - 22 déc. 2006 : 05:44:51
NO! Standby, Busy.
codydoerfler Posted - 22 déc. 2006 : 05:21:57
I think the swich is broke, nothing moves inside the houseing..

To go the soldering route.. are you talking about this:

http://home.comcast.net/~codydoerfler/Jumper.jpg

So I would put the jumper where I drew the red line?

Man... should have just put the thing in the freezer for a day!

Thanks again for your help!

Dave B Posted - 22 déc. 2006 : 05:05:16
It "IS" possible you have a different switch installed.

Looking at your photo. In the side of the switch, it appears there is a moveable black piece inside that you might be able to carefully slide to the right. It now appears to be in the leftmost position. If so, slide it all the way to the right. This should place the unit in "ON". You might also try placing it in the center, and see if the black plastic switch piece will engage it while centered.

Looking closely at the left edge of the switch housing, it does appear the housing is broken and the white slide is missing. Look around carefully. But it's doubtful if you could repair the switch if it's found.

The jumper points would be the ones presently soldered on the back of the switch (not the top and bottom of the switch, rather the top and bottom soldered points on the back of the switch.)
codydoerfler Posted - 22 déc. 2006 : 04:33:46
Thanks again.. this is driving me crazy, this is what I am up against:

http://home.comcast.net/~codydoerfler/DSC_0002.jpg

I cant tell where the white switch would have been attached.. I dont see any moving parts.

If I need to solder a jumper would it be from the top 2? I think having it on all the time is my best option, unless you have another idea.
Dave B Posted - 22 déc. 2006 : 03:17:54
Look at http://img277.imageshack.us/my.php?image=6295custom3tg.jpg and compare it with your's. Make sure you're looking at the correct side of the board.

The switch is labeled SW1, and is just below the button battery. If you've broken the switch, you'll have to solder a jumper between the top and bottom switch contacts to permanently turn the unit on. Or replace the switch, which may be hard to find.
codydoerfler Posted - 22 déc. 2006 : 02:28:00
Dave, thanks for your quick response, but I dont see a white switch like in the pictures. On mine, it is just flat, no place for a white switch to to be. Do you know of a way to turn on the unit without this white swich that is in the picture? how is it attached to the GPS? it is like it disapeared!
Dave B Posted - 22 déc. 2006 : 02:23:07
Go back to page 1 of this topic and look at the pictures. The small white square tab sticking out beyond the board is the switch. Make sure the black switch piece properly engages this before reassembling the back. Try it a couple times to be sure before final reassembly. Its possible to put the black switch piece back in place without properly engaging the switch, especially if the switch was in one position, and the black piece was in the other, or if installed on top of the switch.
codydoerfler Posted - 22 déc. 2006 : 01:42:10
Hello,

I tried to do the short circut thing, and did not loose the black power switch. But when I put it back together, the black powerswitch does not engage anything, I dont see any place on the interals to interact with the black power switch. What did I do wrong? Is there a way to turn it back on? Leaving it on all the time would not bother me.
DuBob Posted - 17 déc. 2006 : 07:10:24
like others i was messing around with sirfdemo and had a bt issue. actually, for me 3.75 works fine (so far) but i tried sirf demo 3.81 and that is when all went bad.

i had to short it out for ~5-8s, tried 1s, then 2, then 4 and then between 5-8 i was able to get it to clear the memory.

thanks for this post ;)
admin_0 Posted - 04 déc. 2006 : 21:57:38
Hello, I have a similar problem with Gpslim236, It works via blue tooth on my pc,I can see it on gps viewer, but it doesn't on my pda qtek s110.
On Pda, Gps viewer don't find the com port. I did the resetting opening the receiver, but nothing Happened. Any Suggestions ?
Pege63 Posted - 27 nov. 2006 : 14:46:40
Correction to last email re problems charging whilst swithced on.
I showed a mate at work re the sbove problem and hooked it upto the mini USB lead I use for my PDA phone and PC. Bingo now it worked ie on/off no difference so in this PC USB mode I can run it on whilst charging. Thought previous problem was a temporay glitch so tried using my home PDA (mini USB) charger and it DID NOT work again although its states output 5V 1A which is the same as the Holux charger that came with the unit. dragged out the Holux charger and NOW it WORKS !!! duhhhh !!!.
OK onto next test, y-day I tried the mini USB lead I use for the PDA phone for the car. Swithced it for the Holux version (it says 850mA) - now it works !!! makes no sense to me. More leads and chargers all over seems to be the outcome of all this but can not work out why ...
any ideas?
Pege63 Posted - 27 nov. 2006 : 12:28:08
I have a GPSlim 236 and its super compared to the Tomtom mk1.
I have no real problems (to date) BUT have one question that I hope you can help me with;
Its sbout charging, I'd expect that I would be possible to use it whilst charging it in the car but tried this y-day only to find that it turned itself off. ie leaving it ON and inserting the charger made the display go completely blank. switching it on after removing the lead does not work at all. I eventually worked out that the only way to get it going is to: leave it OFF, insert the lead again at which point I get the green charge LED, then remove the lead and switch it ON - weird !!! One reason for buying this unit was that in a review it was mentioned that it would run permanently wired into the car ie leave it ON and it will be ready at all times, great idea but nothing in the manual re this so I emailed Taiwan weeks ago (no reply...). Contrary to the article this appears to be a no-no, still surely one should be able to run the GPS whilst charging. Yes I know that it has a 10hr batt.life and no-one will drive for that long, my point is that sometimes power might be too low at the start of the journey without one knowing hence one might need to top it up during a journey. As it is I might end up in a layby for an hour or so or revert back to the paper maps..
Any ideas ??

( Use a Ipaq rx3715 + TTN5 )
Lapwolf Posted - 24 nov. 2006 : 08:55:46
Dave B,

I'm in a similar situation of returning a 236B for exchange to GPS4Evyone. They want me to only send the unit, no box, no accessories.

Assuming they gave you the same instructions, how did you package the unit for safe transport?

Thanks...
Marvin Hlavac Posted - 17 nov. 2006 : 23:22:52
Not a biggie. To solve the MS Streets & Trips problem, read S&T Tips & Tricks, tip # 28 titled 'Solution for GPS receivers not supporting 4,800 baud rate'. Follow the link »
Dave B Posted - 17 nov. 2006 : 23:01:12
GPS4Evyone replaced the GPS, new sn: 236B-63400437. The old one (sn: *311) finally reset after a week, but quit again on it's own.

The first cable they sent wouldn't install, so they replaced it also. New one works fine.

A pleasant surprise is that both the cable and Bluetooth function at the same time, and send data to the PC and PDA at the same time using 38400baud on both. Nice!!

Bad note is I can't use MS&T 2004 or Trip Maker Deluxe with it. Can't get the required 4800b or 9600b. Not a biggie, since I mainly use the GPS for flying.
Scriggle Posted - 03 nov. 2006 : 19:01:40
Good evening

I bought a GPS236 from gpsforless and BT gave up in 3 weeks. I sent it back and they told me 'as Holux UK have closed down they will have to send the unit back to Taiwan', GREAT that won't take long then will it.

I've sent E-Mails to 'info@holux.com.tw', 'wencheng_chung@holux.com.tw' and 'cp_cheng@holux.com.tw' asking for their opinion and guess what ... no reply!

Does anyone else know if Holux UK has really gone down the tube ?

I quite liked the 236 and hope that a replacement comes soon as I don't think there is much to replace it currently.

Thanks for listening.
Dave B Posted - 21 oct. 2006 : 00:13:04
Many Thanks!! My brand new 236B (mini version of 236) is now sitting sans battery, trying to get a reset. Trying to open the case is not yet an option, but if someone has gotten a 236'B' open, please state the procedure.

My only error was trying the SIRF setup in Memory-Map Pocket Navigator after a quick and easy setup for NMEA. MM shouldn't cause this, and Holux, or SIRF shouldn't be so sensitive to a mode switch.

I went ahead and ordered the data cable for future problems, but that shouldn't be necessary either.

Memory-Map Tech Support pointed me to this topic, so they are apparently aware of the problem. The E-bay supplier said to send it back if the problem persists.

mystery905 Posted - 17 oct. 2006 : 17:51:14
Thank you, Thank you, Thank you, cpqkgpsa !!!!

I just did your reset trick and my Holux is back in business. I did however have to do it a couple of times as I didn't short it long enough.

All I did in SirfDemo was change to Sirf mode, then I couldn't do anything else, even a factory reset from the program.

I was almost ready to buy a new GPS until I found this thread.

And I just registered so I could send my appreciation :)

admin_0 Posted - 13 oct. 2006 : 20:47:49
Hello there,
...I was an happy holux 236 owner when I decided to kill the unit by performing a firmware update (using the USB-SERIAL cable).
The procedure contained into the Holux.uk pdf was followed step by step: I did the flash with version "V5" of the firmware (found on the Holux.uk site). The process ended with the "target not responding" message quite soon (no progres bar).
Now on, each time I try to start the 236, I only got the BT blue led blinking; no way to obtain the orange led to even stay solid... It is permanently off. No way to have a fix.
All the attempts to reset the unit by all the suggested methods (eg. short the internal button battery etc.) failed.
What I have understood is basically the following:

1) if the update process is not easy, give it up and live with the bugs: sometimes a defective unit is better than a dead one
2) the holux 236 is basically two devices: a BT interface and a GPS antenna. If you damage one of the two, the second one may work but I don't know how to bring one or the other back to life after a wrong bios flash.

Now, I would like to know if there is someone who knows what to do...
Do you think that I have to throw the unit away?

Many thanks for your time.
ESTIMULO Posted - 18 sept. 2006 : 07:47:36
quote:
Originally posted by cpqkgpsa


There is another common problem with the 236. If your GPSlim236 has trouble to start or maintain a Bluetooth connection (Blue LED permanently OFF) then the following might help:

Open the case as described and press down the area indicated in the following picture, while you turn on the device. You might need to keep it pressed for a longer time if the blue light goes off again instead of blinking.
JayW has come up with this effective solution, which is however only a temorary remedy. He further suggests that soldering some PCB connections on the mainboard will permanently fix the problem.
There have also been suggestions that putting the unit into a refrigerator or near the aircondition can temporarily get the Bluetooth to life, however resoldering seems to be the first solution that would permanently fix the problem.



Remember that any surgery you perform on the 236 will most likely void your warranty. So if you still have warranty I would recommend to return the device and describe the erratic error. Make sure the 236 is tested over a longer time if they cannot immediately reproduce the problem, as some users stated they have been returned their defective unit as "functioning" since it would work flawlessly when tested by the seller.

Have a look at this thread for more information:
http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=64581#389452

Good Luck


anybody know what i need to solder to keep my bt working?
Thanks
admin_0 Posted - 15 sept. 2006 : 15:47:45
I had to register to say - THANK YOU!

After fiddling around trying to get SBAS working with my GPSlim 236 I clicked the dreaded 'Synchronize Protocol & Baud Rate' option and killed my week-old rather expensive toy.

Thanks to your guide it's now back up and running!

Thanks again - I don't think I could have afforded to replace it for quite a while...

-Blacklaw
cpqkgpsa Posted - 07 sept. 2006 : 09:56:59

There is another common problem with the 236. If your GPSlim236 has trouble to start or maintain a Bluetooth connection (Blue LED permanently OFF) then the following might help:

Open the case as described and press down the area indicated in the following picture, while you turn on the device. You might need to keep it pressed for a longer time if the blue light goes off again instead of blinking.
JayW has come up with this effective solution, which is however only a temorary remedy. He further suggests that soldering some PCB connections on the mainboard will permanently fix the problem.
There have also been suggestions that putting the unit into a refrigerator or near the aircondition can temporarily get the Bluetooth to life, however resoldering seems to be the first solution that would permanently fix the problem.



Remember that any surgery you perform on the 236 will most likely void your warranty. So if you still have warranty I would recommend to return the device and describe the erratic error. Make sure the 236 is tested over a longer time if they cannot immediately reproduce the problem, as some users stated they have been returned their defective unit as "functioning" since it would work flawlessly when tested by the seller.

Have a look at this thread for more information:
http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=64581#389452

Good Luck
fastbiker Posted - 24 août 2006 : 00:22:26
Great thread- glad I found it. I thought my gpslim was dead. I took the battery out and put the unit in the fridge for about 10 hours today and its back functioning great.

For anyone on the fence its always worked well for me, until for some reason it just stopped. now that its reset its back to navigating!

Thanks for this thread, and thanks to google!!

Andrew
admin_0 Posted - 23 août 2006 : 21:46:08
Another GPSlim236 saved. I just worked real slow with getting the case off, starting with the USB end. worked just fine. Don't put the case back on until you confirm it works. It took 3 or 4 times - I think the issue is getting a good connection between the two contacts.
Thank You.
Mister_B Posted - 19 août 2006 : 20:02:44
Good to know, thanks for posting back to let us know. I suppose some covers fit a lot tighter than others, mine popped off with minimal prying so possible damage to the unit wasn't a concern. Starting near the mini USB plug (and nearest corners) with a thin screwdriver seemed to be the key to a clean removal. As mentioned before though, take care that the little black switch doesn't run away from you, it would be a booger to find once it hit dark carpet. ;)
Next time I might try the refrigerator trick first, I believe it shortened the wait time to hours instead of days.
satnile Posted - 19 août 2006 : 11:12:44
I took out the battery for 6 days, this has succeeded to force hard reset and the receiver is working fine now. I am glad that I didn't force it open to do the short circuiting.

I advise anybody in a similar situation to be patient and wait for a hard reset to take place after removal of the battery, this could take up to 6 days.

BW


satnile
satnile Posted - 12 août 2006 : 10:09:19
Hi everybody,

Similar problem with my Holux 236, while switching to Sirf using SirfDemo it became unresponsive.

The unit's cover seems to be tightly secured, how much force should I apply to force it open? I am anxious that this may damage the cover, is the case just pressed tight with no pins to hold it that tight? Is there an easy manoever to open it gently?

Can the special USB cable be used with SirfDemo to fix the problem and how?

Why removing the battery for few days doesn't seem to force a hard reset, and it is only by short circuiting the internal small battery that this can be achieved?

Many thanks for you help in this annoying matter.

BW

satnile



Mister_B Posted - 30 juil. 2006 : 00:11:31
Had to stand outside with it for about 5 minutes, not too long of a wait. Checked it with the provided viewer as well as a couple of other apps, working fine again. I guess I'll hold off on further tweaking until the data cable arrives.

Thanks to the OP for the post and especially the pics.

Mister_B Posted - 29 juil. 2006 : 23:57:52
Ok, solved it myself, firewall was blocking imageshack for some reason.
Took about 6 seconds here too, the first few attempts were at 2, 4 and 5 seconds. Still waiting for it to acquire, I'll post again if successful.
Mister_B Posted - 29 juil. 2006 : 23:22:19
For some odd reason I can't seem to see the images in the first post, any chance of someone posting direct links or addresses to them for me? I was careful to not use sirfdemo to change anything but I wasn't aware you can also achieve "brickness" while using APLsirf. Glad I found this forum, hope to hear from someone soon.

I'll just be sitting here with my 236 case open. ;)
admin_0 Posted - 25 juil. 2006 : 15:31:57
hi... i reset my unit after i play many times with sirf star and when i try to open it from my pda..... guess... total broken...
after.. i search on google(holux 236 block) and i arrive right here... when i saw how to open the unit .. was very easy to short circuit the battery pins.. (6 secs).. and all works very fine...
THX for cpqkgpsa
DCreature Posted - 18 juil. 2006 : 01:25:00
What is the default baud rate the unit should be operating at?
wong604 Posted - 15 juil. 2006 : 21:46:14
Check
http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=21511&whichpage=50
out for a easier solution. Try placing the GPS without the big battery into a fridge for 20 minutes. See if that works.
mav155 Posted - 13 juin 2006 : 10:21:48
Wonderful! I did it!! Only two seconds and the receiver came back to life!
Thanks everybody!

Virtute duce, comite fortuna.
puki Posted - 10 juin 2006 : 16:39:52
mav,

i dont have a cable - as i dont have the need for it with bluetooth.

after you disassemble the receiver - take a small screw driver, and just hold it firmly against the two 'rods' going up to the battery for a second or so [mind you - i had to hold it for a couple].

how you know?

you hold the battery firmly up against the plate and have the 3 golden connectors touching the battery. flick the power switch, and it will turn on.

then with another hand - pair it, and use GPSView to see if you get any data. if you do - work complete.

if not - then repeat the procedure - whilst holding it for a second extra than before.

good luck.
mav155 Posted - 09 juin 2006 : 10:38:29
Ops, I've done the same thing, syncronizing protocol and baud rate via BT...Now I'd ask you some more details about this resetting procedure (I wouldn't damage the receiver because it isn't mine).
When I disassemble the receiver (powered off), I have to simply shortcircuit the two pins for a second? How do I see it has been resetted?
Forgive me, but I've never worked with circuits...
Last question: with a usb data cable is the reset easier?

Thanks a lot

Virtute duce, comite fortuna.
puki Posted - 06 juin 2006 : 02:32:30
now - to all those that have done this procedure and the original poster especially - a big thank you.

i love to tinker with things - so the first day i got my holux [last night] - i pressed what i shouldn't have in SirfDemo. Long story short - it locked up - and couldn't do anything about it.

ended up working again after performing the procedure outlined above - although i had to hold it for more than a second to get it to work.
gpspassion Posted - 22 mai 2006 : 01:17:32
I'd also pick either http://www.gpspassion.com/fr/articles.asp?id=190 ;-)

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frder Posted - 22 mai 2006 : 00:53:08
I vote for the excellent Royaltek 2001/2010.

francesco
paulkbiba Posted - 21 mai 2006 : 21:45:46
The "standard" has become, in my opinion, the GlobalSat BT338. The one I have works like a charm.

Moderator
Don't forget the GPSPassion Club!
pwillikers Posted - 21 mai 2006 : 21:11:51
I was about to buy a Holux 236 buy all the reset problems described here in gave me cause for pause. What is the most reliable SIRF Bluetooth GPS? By relible I mean, turns on, finds satellites, connects via BT everytime. Thanks.

Paul Williamson


Mitac Mio 168
w/ 1Gig SD card

CoPilot Live Pocket PC 6: acceptable - includes capable PC map/route app. for route planning. Entire US map fits on a 1 Gig SD card. PPC app. is configurable, with twenty-five waypoints per route, yeah baby! TTS guidance is marginal, menu layout should be more intuitive.
NAVMAN SmartST V2: unacceptable - no waypoints allowed in the route.
Delorme SAHH 2005: unacceptable - slow map redraw, kludgey map mgt., "find" is terrible.
MicroSoft ST 2006 PPC: unacceptable - abject garbage, kludgey map mgt., no on-PDA routing. What? Bill are you kidding?
cpqkgpsa Posted - 06 mai 2006 : 07:53:52
My 236 has similar difficulties getting a fix in certain situations. These are:
  • When I turn the GPS on in a place where it can not get a fix e.g. concrete building and leave the building a few minutes later. Seems after a certain time without lock the unit discards all cached position data and starts scanning from the very beginning.
  • When the GPS is being moved before it has acquired a fix. Usually the 236 is very quick in finding a fix after being turned on and left in a steady position for less than a minute. However if I start walking or riding a bicycle before I have a fix, chances are that it will take more than 10 minutes despite a halfways clear sky view.

In the above cases the 236 is by far outperformed by my old and cheap Garmin Etrex. I am somewhat disappointed about this and hope it can be fixed by a user deployable firmware.

The main thing the 236 does better than the Etrex is keeping a fix once acquired. That makes it possible to keep a fix from within some buildings and cuts down reacquisition time after unobstructed sky view is available again.

Sounds like others like Marvin are having similar difficulties. Anybody come across a firmware fix yet?
Marvin Hlavac Posted - 05 mai 2006 : 22:54:24
Sometimes when I go to an underground garage for 10 or 15 minutes I cannot get lock upon coming out. I was always under the impression though that this issue was no longer present with later firmware version. My unit is one of the early ones. However, when the issue happens all I need to do is turn it off and turn it back on. All is just fine immediately. But if I don't restart it I could wait perhaps even forever. Once out of curiosity I let it sit there for an hour, but it would not reacquire satellite signal fix. (Upon restarting it was immediately back to normal)

For me personally this is just a very minor inconvenience. GPSlim236 is still the receiver that best meets my needs ;-)


Marvin Hlavac______________
iG customization | AR and S&T Tips & Tricks
admin_0 Posted - 05 mai 2006 : 22:31:50
Thanks for the reset tip. I just got my Holux 236 yesterday and using it with my ipaq 4150 it was working fine last night. I then left it on charge overnight, then for some reason it wasn't finding a fix from the satellites after several attempts of rebooting, etc. It saw the sats and was connected via bluetooth but never locked in to any of them for hours.
After doing the manual reset you described by taking apart the unit (only took less than 30 seconds to do the whole thing) it then locked in and found a fix and all is back to normal!
grumble Posted - 03 mai 2006 : 11:10:21
Chris you are a star !!!!
Had completely borked my 236 and was trying the 'battery run down' method when I came across your post. Took about 3 secs of shorting for mine.
I will now add another warning. DONT use the Memory Map Sirf utility, guess what happens :)
txl Posted - 26 avr. 2006 : 08:25:45
Any news/ideas on the reset by cable ?

Thanks
ro-76 Posted - 26 avr. 2006 : 08:10:43
Just mailed mine back to the suplier yesterday!

I figured out that it was a hardware problem anyhow, because tapping the case, or gently squeezing it near the LEDs would sometimes correct the problem.

I'm getting a refund from my eBay seller and buying a new one from Nav4all.com.

Ro
Egmont Posted - 26 avr. 2006 : 04:00:31
I can't check my serial number, it's all packed up. I got an RMA.
I guess you should do the same.

Egmont
HP iPAQ4705 w/G10, BT338 & Holux 236
iQue3600
2610
among others
ro-76 Posted - 24 avr. 2006 : 21:30:50
quote:
Originally posted by Egmont


It took longer and longer for it to come on, I had to use the on/off switch multiple times for BT to come on and now the blue light just stays on, no blinking, no connection.
Has someone seen this before?



I also have a 1 week old 236 with a similar problem. Was working fine but now the bluetooth connection seems to be haywire. I either get no blue light, a constant blue light or the correct function.

I tried the reset thing earlier today, but didn't seem to fix the problem. In the past few minutes, I found that rapidly switching it off and on again seems to correct the problem after a few attampts.

My serial number is: 236-611XXXXX

Does anyone have any ideas?

Thanks,

Ro
Egmont Posted - 23 avr. 2006 : 00:20:56
I also got a 236 a few days ago and did not play with the demo ;-). The reception is phenomenal, just about 5 bars every where, but all is not rosy. Connected with the data cable to the laptop and GPSGate it works flawless, the problem is BT.
It took longer and longer for it to come on, I had to use the on/off switch multiple times for BT to come on and now the blue light just stays on, no blinking, no connection.
Has someone seen this before?

Egmont
HP iPAQ4705 w/G10, BT338 & Holux 236
iQue3600
2610
among others
txl Posted - 20 avr. 2006 : 16:44:25
Hello all,

Of course I played with sirfdemo and of course I screwed up the unit...

But I have the data cable so is there a way to make it come back "from the dead" with the cable ?

Thanks a lot
admin_0 Posted - 27 mars 2006 : 21:47:18
After having used the famous by now "Synchronize Protocol & Baud Rate" I was just about to throw the Gpslim236 out of the window, when I stumbled upon Chris' posting.
Thanks Chris you just saved me a unit.
admin_0 Posted - 27 mars 2006 : 15:52:28
Chris you are the best!

I too played around with the infamous SirfDemo software and lost connectivity permanently with my 236!

After leaving it on without the main battery for 2 nights I was all bummed out, but after finding your post and doing the quick shortcircuit it came back alive!

Thank you!!!

-Felipe
bjobr Posted - 13 mars 2006 : 23:47:08
I just received my 236 today and fiddled around in SiRFDemo. Of course I ended up with the same problem you had, and moped for a while. Then I found your excellent post and was up and running again in minutes!

Thanks, Chris!
komsan Posted - 21 févr. 2006 : 18:36:31
Cyberdude, I have found your post on Pocketgpsworld. Good to hear that your problem was fixed.
your question, Does your receiver lock to the satellites, i.e. the LED blinks?
Yes, it does. Red LED keeps blinking fine but no satellite, Lat/Long, Pdop or any info were shown on GPS application. I decide to discharge internal battery by leave out external Battery for 1 week, not sure it will work or not but it may a last method that I can do. I wonder why it worked well last month and then faulty without any reasons. I am sure I did not modify, change setting, accident falling or make any difference from the previous usage. Very strange!
I will post this problem on that forum as you advice and wait for the solution.
would you please leave your email address to me at komsan888@gmail.com ?
Thank you again
cyberdude Posted - 21 févr. 2006 : 18:10:39
I remember I needed 3 attempts to reset my receiver. Each time I shorted it a little longer. There is no way to tell if it has reset execpt by trying it or if you have the data cable you can check the values with SIRFDemo I think.

I had to reset mine as I was messing around with an app on my K-Jam which switch the receiver to SIRF mode (used for walking) and when trying to switch it back it seemed to corrupt my receiver.

If yours was working fine before (and you haven't messed around with it) then it's possible that your receiver is faulty.

Does your receiver lock to the satellites, i.e. the LED blinks?

If you haven't already done so, you can also try posting in the Holux Forum on Pocket GPS (http://www.pocketgpsworld.com/modules.php?name=Forums&file=viewforum&f=34)
The UK Holux tech support people read that forum and respond occasionally.
komsan Posted - 21 févr. 2006 : 17:22:08
Thank you Cyberdude for very fast reply
I did it as you described but still did not work.
My 236 is paired normally with BT PPC and SPP connected on Comport 8 correctly. Unfortunately, no data or anything has shown on GPS Status page all applications. It says " GPS Not found".
How do you know that the device is resetted after doing short circuit?
Mine, have to connect and running GPS application in order to see that GPS work or not, am I right?
I suspected that my unit is dead. very sad because I used perfectly for a month ago but when I used yesterday it just did not work.
Anyway, Thank you so much.
cyberdude Posted - 21 févr. 2006 : 15:51:14
Make sure the receiver is switched off. Then with a thin metal object, I used a small screw driver, touch the two soldered contacts coming off the small backup battery (shown in the image above). Make sure you touch both contacts at the same time and hold it for a second. I had to hold mine for about 3 seconds but I would try with less first. The receiver should be reset after that.

Good luck.
komsan Posted - 21 févr. 2006 : 15:40:07
Hi,
I also have a problem as Cyberdude.
"I can no longer connect to the assigned com port. I have paired the receiver to my PPC (i-Mate K-Jam running WM5) on com 7 but none of my GPS apps can see the receiver or receive any data from it and doing a scan shows nothing on com7."
My 236 does not work now with unknown reason. I have successfully opened the unit case by following above pics. Please clearly explain how to short circuit to reset it. What tools should I use? I did it but nothing happen, still the same.
Thank you
Sallykil Posted - 20 janv. 2006 : 08:59:18
Thank you, gentlemen. I will buy it, sounds like best thing out there in bluetooth GPS receiverland. At least I now know what to do when I completely foul up the little bugger with too much benighted instruction.

SallyK
cyberdude Posted - 16 janv. 2006 : 13:36:37
quote:
Originally posted by Sallykil

I was thinking of buying the Holux 236, but now you all have me thinking it is glitchy. I don't think I am comfortable popping it open and attempting an ad hoc short circuiting for a reset. Should i get the special USB cable when I order it? Sound like they need a reset pretty often. Any other recommended Bluetooth receivers that would be as sensitive?

SallyK



It's a great receiver. Now that mine is reset, it works faultlessly and I'm very happey with it. The reason I needed to reset mine was, that I was messing around with it setting it into SIRF mode, etc. I don't have the usb data cable so was using some software on my PPC and doing it over BT. I only found out afterwards that the software had a bug and couldn't set it back to NMEA mode. With all the messing around I tried, I think I messed up the synchronisation of the protocaol and baud rate - hence the required reset.

Moral of the story - don't fix it if it ain't broke

Go ahead and buy the receiver. Just use it out of the box and you'll be fine. If you are inclined to mess with it then get the data cable too.
Marvin Hlavac Posted - 15 janv. 2006 : 20:54:46
SallyK, I have had GPSlim236 for several months. I use it on almost a daily bases, up to 12 hours a day. I have had no problems, and at this time I don't think there is yet another GPS receiver out there which would meet my personal needs better than this one. So, if something should ever happen to it I would not hesitate to buy another GPSlim236 (unless something else comes on the market in the future which cathes my interest ;-)


Marvin Hlavac ~~~ To see my recent location click here :-)
iGkeys | iG Customization | S&Tkeys | ARkeys | S&T + AR Tips & Tricks
Sallykil Posted - 15 janv. 2006 : 19:30:03
I was thinking of buying the Holux 236, but now you all have me thinking it is glitchy. I don't think I am comfortable popping it open and attempting an ad hoc short circuiting for a reset. Should i get the special USB cable when I order it? Sound like they need a reset pretty often. Any other recommended Bluetooth receivers that would be as sensitive?

SallyK
cyberdude Posted - 14 janv. 2006 : 15:10:44
OK, I got it working. I had to short the terminals for about 3 seconds. But it's all ok now. Thanks for this thread cpqkgpsa. I thought I was doomed with a dead receiver.
cyberdude Posted - 14 janv. 2006 : 14:58:10
Does this reset the receiver back to factory settings?

I can no longer connect to the assigned com port. I have paired the receiver to my PPC (i-Mate K-Jam running WM5) on com 7 but none of my GPS apps can see the receiver or receive any data from it and doing a scan shows nothing on com7.

I tried the reset discussed above but it didn't solve my problem. My BT blue light flashes and the fact that I can pair it with my device must nean that the receive is transmitting. It's not my PPC either as I have tried on my partner's and it doesn't work either.
coyotebush Posted - 31 déc. 2005 : 11:48:23
Many thanks for the information! I got my "dead" unit running in just a couple minutes.

I figured it was a baud rate mismatch between the Bluetooth module and the Sirf chip. I was getting ready to order the serial cable which would hopefully allow me to match the baudrate.

- John Morris
Menlo Park, CA
cbmx6 Posted - 29 déc. 2005 : 18:13:56
Interesting, that certainly explains it. I didn't pay too much attention to the time values. The first "on time", after power on, was always too short to be able to get a bluetooth connection up. I've filed this under "learning experiences".

On the plus side, opening the case allowed me to darken the blue led with some tape.
cpqkgpsa Posted - 29 déc. 2005 : 01:59:07
Hi cbmx6:

I have had some trouble with the trickle power mode myself in the past, but was able to resolve it without opening the receiver. Here is my clue to what happens and why the unit appears to be non-responsive:

This is what the SiRF Binary Protocol Specifivation says about power save mode:

quote:
Computation of Duty Cycle and On-Time

The Duty Cycle is the desired time to be spent tracking. The On-Time is the duration of each tracking period (range is 200 - 900 msec). To calculate the TricklePower update rate as a function of Duty Cycle and On Time, use the following formula:

Update Rate = On-Time (in sec)/Duty Cycle


From my experiments it seems that between the intervals specified when switching to power save mode, the receiver actually shuts off completely and will not even process commands sent to it.
So in an extreme case when the receiver will only turn on every xx seconds, the chance of hitting an active period to send a reset is not very high.

So the best guess before opening the case would be to do some mouse acrobatics and try to switch back to continuous power mode in SiRFDemo until it works - or write a small utility program to do the job for you.

Chris

#36828;#22312;#27888;#23665;
cbmx6 Posted - 29 déc. 2005 : 00:26:30
Thank you very much Chris for posting that, especially with the pictures as it came in very handy for a reset I had to do today.

My own woes came from playing about with SiRFDemo and putting it into a power save mode it refused to come out of. No amount of serial port/bluetooth antics would get it to talk. Luckily a reset did the trick.

In my case a momentary short wasn't enough - I needed to short for a full second to get it to clear the ram. (Even so it still seems less invasive than a soldering iron.)

For future readers I would also say make sure you don't lose the power switch which easily falls out.
gpspassion Posted - 26 déc. 2005 : 11:06:51
Indeeed, but that old "dsynching problem" that plagued the first GR-230's in 2003 should be gone, my 236 doesn't have that problem, will have to check PN and SN numbers.

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paulkbiba Posted - 26 déc. 2005 : 06:29:03
Hey, Thanks! Fascinating!

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