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Repair guides and support for cassette players.

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Battery leak require board level repair

Hello, i recently get Panasonic RQ-SQ20 and try to restore it.

This is what i done so far: When i try to power it up, i don’t get a red light indicator so i try to disassemble the device. Then i desolder the board from the chassis and battery connector just fell off. I solder it back, try to power it up and still nothing. Next, i inspect the board and found it had battery leak corrosion around IC4. Then i try to scrub the board with flux and little bit of solder and some of the copper pad fell off. I tried to connect the broken pad with thin copper wire but still not working.

Here what i know so far: Main GND and VCC is getting around 1V.

What should i try next? I have a schematics but can’t really understand it properly.

PS: I’m doing this as a hobby and not fully know what i’m doing.

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Schematics

Board

Table

[Update 12/12/21]

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@catzymbs cdan you post a clear straight on picture of the repair? The last image is hard to see because it's angled. A straight on picture will be better.

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@oldturkey03 Thanks for a response, Here is the best picture i can take so far. i also draw trace of what it should look like. The red line is original trace with thin trace connected from HOLD. Then bottom trace which is SL. Then the blue circle is via that corroded so bad solder wont stick to it. and yellow line is my copper wire

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it looks like there are some damage resistors on the left side of that IC6

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@catzymbs something does not look right with the solder bridge on C601, which could go to R602 but the orientation at the point of your jumper looks off as well as the location of the bridge. Let me see if we can clear the schematic up a bit. I hate that they have both sides on one page. I attached some images just for reference of what those parts are and how they are connected. There is nothing missing between R601 and R701 but it could use a bit of cleaning up. Lets see what we find around that area. I also flipped the image of the underside so that it would match your image. that was done for clarification only.

You mentioned “corrosion around IC4” that area looks good. Was that a typo?

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@oldturkey03 My bridge to C602 is trying to emulate SL but i think it is not necessary and i’m removing it now. Then black stuff at the IC6 left is my attempt to put solder so i can connect broken via.

Yes “corrosion around IC4” is a typo, sorry about that.

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Because i can’t follow the PCB trace properly, i try to shine a phone camera light diffused by few layer of paper towel to the PCB. From my previous attempt i know that via under my wire bridge is destroyed so i try to connect it with long copper wire but still not working. I suspect that there is a further corrosion under the IC6 and unfortunately further procedure require IC6 desolder and i don’t have right equipment to do so. But thanks for y’all help so far.

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@catzymbs That actually all looks pretty good. Smart idea about the light makes things much more visible. I agree with removing the jumper. Just take another look at the solderbridge of where the resistor should be. Just making sure it’s not shortening anything out.

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Generally, battery corrosion occurs around the battery. Battery corrosion is best removed with vinegar. I am suspecting the corrosion may be due to spilled liquid as in Coke or other such liquid since it appears to be away from the battery contacts. If so, the damage could be extensive and may affect components as well as traces.

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Hi, thank you for replying. This device support both gumstick battery and AA battery with adapter. In my case, the trace around AA connector is corroded. You can see at the left of the IC6 is AA connector and PCB trace around it has like bubble effect on it. There might be other damaged component as well so thank you for bringing that up.

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