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Old 07 January 2020, 08:34   #1
005AGIMA
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A500 Tank Mouse vertical movement issue

Mouse issue:

Left and right is fine. (dodgy at first and improved after blowing the wheel)

Both buttons are fine.

Up and down doesn't work.

Tested a known good mouse on my A500 and that worked fine (phew).

Took a can of compressed air to the open mouse. Didn't seem to make any difference...however....if I spray it while plugged in (yes I did this), the wheel spins fast and THAT gives up and down movement.

So now after much spraying and rolling, I some "some" up and down movement but very little and very sporadic.

Ideas? I really want to try and resurrect this mouse as it's the original from this pack and in excellent condition cosmetically.

The situation "seems" to improve the more I hit it with spray but I'm wondering if a known electrical fault should be looked at?

Additional:
Yes all the simplest things were tried first.

Old habits die hard. The VERY first thing I did was pull out the ball and inspect the condition (almost spotless) and move the rollers directly.

Most testing since then has been done with mouse open, turning the wheels directly.

Adding this info to the OP

Last edited by 005AGIMA; 09 January 2020 at 03:54.
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Old 07 January 2020, 09:03   #2
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The cable might have an internal break, usually near where it enters the mouse.
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Old 07 January 2020, 10:04   #3
solarmon
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This should be the schematic for the tank mouse:

(http://www.pavouk.org/hw/en_amigamouse.html)



If the left/right directions - i.e. (H)orizontal is working, but there are issue with the up/down directions - i.e. (V)ertical, that could an issue with:

1. The pins/cable for the V and VQ signals - i.e. pins 1 and 3.
2. The pull up resistors for the V and VQ signals.
3. The logic chip LM339 (Quad differential comparator).
4. The pull down resistors for V and VQ inputs to the LM339.
5. The V optical sender and receiver components.

So you should check these traces/pins/components.
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Old 07 January 2020, 11:36   #4
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Photoresistors can get old and the temperature decrease from spraying them could be making them perform better.
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Old 07 January 2020, 11:49   #5
PR77
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Quote:
Originally Posted by AmigaHope View Post
Photoresistors can get old and the temperature decrease from spraying them could be making them perform better.

Agreed. I also had an issue with the Photo resistors / interrupters.
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Old 07 January 2020, 14:18   #6
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I have one of these mice in a drawer with a very similar fault. I've tested everything and can confirm in my case anyway its the photo resistors.

Worth checking your cable first though just in case.
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Old 07 January 2020, 15:20   #7
005AGIMA
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Cheers guys. Have pulled out my multimeter and will have a poke around inside the mouse again tomorrow.
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Old 07 January 2020, 17:42   #8
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I had the problem in my tank mouse. One of the optical sensors was out of spec, which caused the IC chip receive the wrong voltage on one of the inputs.
I solved it by installing resistor in parallel to one of the input.
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Old 08 January 2020, 11:07   #9
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Quote:
Originally Posted by amiman99 View Post
I had the problem in my tank mouse. One of the optical sensors was out of spec, which caused the IC chip receive the wrong voltage on one of the inputs.
I solved it by installing resistor in parallel to one of the input.
Cheers mate. I saw another thread on the topic where someone replaced the bank of 5 resistors but I can't for the life of me find it now.

What ohm resistor did you use and where did you fit it?
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Old 08 January 2020, 11:26   #10
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Have a look at this blog post regarding replacing the phototransistors:

https://www.tsb.space/knowledge-base...se-fix-x-axis/
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Old 08 January 2020, 11:44   #11
005AGIMA
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Quote:
Originally Posted by solarmon View Post
Have a look at this blog post regarding replacing the phototransistors:

https://www.tsb.space/knowledge-base...se-fix-x-axis/
Ah fantastic. Thanks!
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Old 08 January 2020, 13:27   #12
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Probably a very silly question BUT did you thoroughly clean both weighted ball and the physical rod(s) and roller it turns against in the mouse ball cavity?

These old mechanical ball mice are notorious for having the rods that turn the interrupter wheels jam against the rotating ball due to an uneven build up of gunk on these rods. you can use Isopropyl alcohol and cotton buds to clean stubborn gunk off the ball, the roller, and the two x-y rods.

Having up and down work when compressed air is rotating the interrupter wheel indicates that your wired connections are probably fine.
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Old 08 January 2020, 14:48   #13
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Up and down should work perfectly even by just rubbing the tip of your finger against the roller in the mouse ball cavity. I'm assuming the 005AGIMA tried this already?

A common fault with tank mice is, that the pressure roller in the corner gets jammed and no longer presses the ball against the rollers reliably. Usually happens if the mouse gets dropped. Easy enough to un-jam, but again I'm assuming the easy stuff has been tried out already.

Last edited by Jope; 08 January 2020 at 14:58.
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Old 09 January 2020, 03:53   #14
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Hi guys. Yes all the simplest things were tried first.

Old habits die hard. The VERY first thing I did was pull out the ball and inspect the condition (almost spotless) and move the rollers directly.

Most testing since then has been done with mouse open, turning the wheels directly.

Adding this info to the OP
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Old 17 January 2020, 09:57   #15
005AGIMA
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Quote:
Originally Posted by solarmon View Post
Have a look at this blog post regarding replacing the phototransistors:

https://www.tsb.space/knowledge-base...se-fix-x-axis/
Thanks again for THIS LINK!

Purchased a pack of 10 OSRAM LPT 80 A phototransistors from RS Components online. Delivered next day for free (as in delivery was free) for about $11.

Installed 2 for the Y axis and the mouse is good as new. PERFECT!!!!!

Very very happy.
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Old 17 January 2020, 10:25   #16
solarmon
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Quote:
Originally Posted by 005AGIMA View Post
Thanks again for THIS LINK!

Purchased a pack of 10 OSRAM LPT 80 A phototransistors from RS Components online. Delivered next day for free (as in delivery was free) for about $11.

Installed 2 for the Y axis and the mouse is good as new. PERFECT!!!!!

Very very happy.
Well done for fixing it!
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Old 25 January 2020, 08:23   #17
005AGIMA
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Video of the mouse symptoms, fix, and result.

This is in no way a "how to" but hopefully some future user will find some of it helpful.
[ Show youtube player ]

Timecodes:
00:00 Intro/symptoms.
01:38 Troubleshooting - try another mouse.
02:40 Troubleshooting - compressed air clean.
07:19 Troubleshooting - resistors checked / looking at IR Diodes.
09:29 Swapping phototransistors including getting to them by opening the clips.
18:08 Testing and the result
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Old 25 January 2020, 19:30   #18
amiman99
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Sorry, I did not enable the notification for this thread and missed your question. My fix would not work for you if your diode was the other one.

Nice job on fixing it properly. I did it the hard way, not correct way, and with parts I had on hand.
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Old 14 April 2020, 16:06   #19
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Hope this doesn't qualify as a thread hijack but...may I ask whether the A1000 tank mouse has the same parts as the A500 one?

I'm having issues with either H or V (maybe both? it's been a while) and since it is very difficult and expensive to source an original replacement I would like to repair this one if possible.
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Old 14 April 2020, 18:35   #20
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They are the same mice as the very early A500 mice with a sliding ball door. The ones with a rotating door are subtly different.
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