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> C860 Charging Problem (not Battery), weird voltage measured on the terminals
seva
post Mar 24 2005, 08:31 AM
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(This is going to sound like a lot of other posts, but read on for more details)

Recently I got my C-860 back from Sharp via Japan Direct, I wanted them to look at the CF port, which may or may not have had a problem, anyhow everything was working fine in regards to charging before that, but after I got it back I couldn't turn the Zaurus on.

I thought this was my battery, so I ordered a new one, Zaurus turned on. After the battery discharged it wouldn't charge anymore, that's when I started looking on the forums about other similiar sounding problems.

I know there are a lot of people reporting problems charging, and have often found odd solutions, like flashing the current state of the battery into the D+M Batt Voltage Adjust menu.

However, it seems like I have a hardware issue, I measured voltage across positive and negative terminals on a normal Zaurus C-860 (my friend's) and mine; here's what I got:

CODE
Normal Zaurus:
   Charge off: 0.4V (or something close to that)
   Charge on: 4.2V

My Zaurus:
   Charge off: 3.0V
   Charge on: 2.5V


What is going on here? Any suggestions? I don't really want to send it back to Japan, because last time it took 3 months?!

For the record, my new battery seems to be fine, when charged in my friend's Zaurus, I can use it just fine until it's drained.

Thanks for reading, as a bonus here's a picture of two C-860s side by side, click for a larger version:


P.S. I meant to post this in the hardware sub-forum, mods feel free to move.
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cgrieves
post May 19 2005, 08:49 AM
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Seva did you ever have any luck getting your unit repaired or replaced??
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seva
post May 19 2005, 08:51 AM
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QUOTE(cgrieves @ May 19 2005, 08:49 AM)
Seva did you ever have any luck getting your unit repaired or replaced??
*


No, I've been pretty annoyed by this and haven't sent it back yet.

I'll try today.
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cgrieves
post Jun 8 2005, 01:48 AM
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QUOTE(seva @ May 19 2005, 04:51 PM)
QUOTE(cgrieves @ May 19 2005, 08:49 AM)
Seva did you ever have any luck getting your unit repaired or replaced??
*


No, I've been pretty annoyed by this and haven't sent it back yet.

I'll try today.
*



OK just wanted to keep this thread alive. I have a friend who emigrated from the UK to Japan some years ago, and apparently his girlfriend is a bit of an ogre..... apparently she never keeps receipts or boxes for electronic good, and when something goes wrong with an item, she goes into the shop where she thinks she bought it, throws it at the assistant without box or receipt, does a bit of a strop, and 99% of the time gets the item replaced. Not very ethical I know, but I am going to ship my C860 over to her and get her to try it.

Worth a try.

I am also going to try and get some info on how to get in touch with Sharp Japan.

Let me know if you have any joy with yours!
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tecks
post Jun 8 2005, 02:27 AM
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What kind of power suppply do have? I've had a third party one and changed in a weak moment the polarity ...
It took only seconds to kill the charge modul...... sad.gif

Ulli
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omega
post Jun 8 2005, 02:48 AM
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QUOTE
Normal Zaurus:
  Charge off: 0.4V (or something close to that)
  Charge on: 4.2V


I don't know what you were measuring, but battery voltage doesn't drop to 0.4 on a normal zaurus - the battery would have to be completely wrecked to have such a quick loss of charge...
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seva
post Jun 8 2005, 08:15 AM
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QUOTE(omega @ Jun 8 2005, 02:48 AM)
QUOTE
Normal Zaurus:
  Charge off: 0.4V (or something close to that)
  Charge on: 4.2V


I don't know what you were measuring, but battery voltage doesn't drop to 0.4 on a normal zaurus - the battery would have to be completely wrecked to have such a quick loss of charge...
*



... thanks for reading before posting.

I was measuring the charging circuit not the voltage from the battery.

P.S. JapanDirect didn't even bother to reply when I asked them to help me fix the Zaurus (and sent them a link to this thread), you may want to keep that in mind when you consider whom to purchase your next toy from.
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maslovsky
post Jun 8 2005, 02:56 PM
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CODE
My Zaurus:
  Charge off: 3.0V
  Charge on: 2.5V


This is easily fixed by replacing a few capacitors. Afriend of mine did that a few times.
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cgrieves
post Jun 22 2005, 04:23 AM
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QUOTE(maslovsky @ Jun 8 2005, 10:56 PM)
CODE
My Zaurus:
  Charge off: 3.0V
  Charge on: 2.5V


This is easily fixed by replacing a few capacitors. Afriend of mine did that a few times.
*


Whooooooaaaaaaaaa there cowboy!

I think this is the answer I am looking for.....

Maslovsky, my friend, my best friend.... biggrin.gif Is there any chance you can get some more info on what caps we need to replace? I'm have access to decent solder/desolder gear so this might solve all my problems!

There's a reward in it for you (can't think what yet, but we'll think of something!)

Cheers!
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Boris
post Jun 22 2005, 08:15 PM
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QUOTE(maslovsky @ Jun 9 2005, 04:56 AM)
This is easily fixed by replacing a few capacitors.

Could you please elaborate a little bit more ? Which capacitors ? An electrolytic ones ? If they die in the normal operation modes then shame on Sharp biggrin.gif
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maslovsky
post Jul 11 2005, 12:55 PM
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Sorry for some delay - my rfiend only recently found sometime to take my zaurus apart to try to fix fix sound problem. He told me he was going to take some picctures of the board and provide some instructions about what needs to be fixed for the charging problem...
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edi800
post Jul 12 2005, 12:56 AM
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Allright, cool - we are waiting :-)
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cgrieves
post Aug 4 2005, 06:55 AM
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Bump!

Don't want this thread to die!
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maslovsky
post Aug 4 2005, 12:11 PM
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Sorry guys, the pictures will be avaiable soon. My frient went on vacation before I reminded him about the pictures...
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bethanyb
post Aug 11 2005, 05:16 PM
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QUOTE(maslovsky @ Aug 4 2005, 12:11 PM)
Sorry guys, the pictures will be avaiable soon. My frient went on vacation before I reminded him about the pictures...
*



My c860 is not turning on. I didn't think this to be a battery issue until I read your post. Even when my Z is plugged into the wall outlet, it will not turn on. Do you think that could still be a battery issue?
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