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JPM Impact - error following PCB repair

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Hi everyone, I have been busy restoring an old JPM Impact machine. It was functioning but in a very fair state. Over the past few weeks I've had a lot more time to do things. The PCBs were all in a poor state so I cleaned them all up, it was all put back together and functioning nicely. The last job on the electronics I had to do was get the 2.4v battery off which was pretty fuzzed up and had clearly leaked (but not too badly). The component below it had got away lightly, but the socket was really done (see pictures). I have put flying leads on a new battery and have replaced the socket as well as cleaning up the acid with bi-carb. I had to bridge a broken track that had rotted away with the acid.

 

When I finally started it up tonight, the reels all came into life and it started up ok, the machine alarmed because I also had the front off, so I was busy putting the front back on and then after about 5 minutes I noticed that it had an error: 2.9 (which is: 2.9 REEL DISCONNECTED Reel disconnected,Loom O/C, Mother board). Also there was a crackle / noise that started from the speakers. I think that everything else is plugged in ok because I'd tested it before I started finally working on the processor board.

Has anyone seen this before or had a similar experience?

Many thanks!

 

David.

 

Broken track bridge:

IMG_20200513_220735.jpg

 

Damage visible once battery was removed (post initial PCB clean):

IMG_20200503_150029.jpg

 

Acid damage to socket of component below battery:

IMG_20200506_173158_2.jpg

 

Replaced socket (and new 2.4v battery flying leads to top left)

IMG_20200513_212845.jpg

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Posted (edited)

The board is damaged.

A lot of the solder resist (green protection over tracks) will probably need removing, will need the battery leakage neutralising under it and any broken tracks repairing.

You see all the mottling in the green colour on the large track on the right hand side of the board that starts at BT1?

That mottling is the track being slowly destroyed under the solder resist by the alkaline leakage from the battery.

It will not stop eating tracks away until it is all neutralised and the tracks repaired.

Long process but needs doing and doing right to keep the board working and not deteriorating.

Edited by mavroz

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Yeah the card could do with a scrape and a proper look. I think your error might be down to something else though it's quite unique and the cpu card doesn't drive (power) the reels as such from there... you may have errors on the cpu card but it would be all reseting, horrible, alpha display potentially messed up and lots more errors would more likely pop up. 

If it was a generic all reels fault would pop up with Reel 1 error code first. Which makes me think Reel 2 is more significant... so it seems more specific to the driving of reel 2... so that's loom/reel/driver on the main board would be my guess. I can help you test your boards here if you get stuck.

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Thanks for the responses and advice, very useful! I put the project to one side as I was working on some car stuff, but I'm picking it back up again at the moment so I'll let you know how I get on. @MattyL I think I'll probably take you up on that offer, many thanks. Does anyone have access to PCB layouts as well or know if people have recreated these boards at all?

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Yes new ones are being made right now, these are my latest version

E74B824B-7DA4-45E2-9E98-1E46B03B940F.thumb.jpeg.409bb9a40481f18001fc5eb2d25dd6f0.jpeg

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My PCB evolution from left to right, one on the right being latest version

EECBB9D2-2D26-407C-B24A-103D8F2B3AA1.thumb.jpeg.3ea47b80843ba06e621fc1a3d2765ce5.jpeg

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They look fantastic, great work. Btw - are U4 and U5 the same component? I noticed they had different JPM sticker IDs on but the right hand side one (looking at your PCBs) is a PALCE16V8H-25PC/4.

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