(Topic ID: 230320)

Data East left speaker not working


By Jakers

4 months ago



Topic Stats

  • 4 posts
  • 2 Pinsiders participating
  • Latest reply 4 months ago by wayout440
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#1 4 months ago

I’ve got a Robocop that has no sound coming from the left speaker. I’ve checked all connections including the ribbon cable. My guess is a dead left channel amplifier. I can’t find schematics for the sound board. In this picture, which is the left speaker amplifier? 1,2 or 3?

61C9AB70-A7B0-481B-9E99-B31BEFFB5572 (resized).jpeg
#2 4 months ago

Looks to be the same as Secret Service. Left would be number 2. Get the full schematics for Secret Sevice from IPDB.com Also while looking at your pic, I noticed you have a bent pin at CN1 speaker output connector at the top. That could be your problem right there.

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#3 4 months ago
Quoted from wayout440:

Looks to be the same as Secret Service. Left would be number 2. Get the full schematics for Secret Sevice from IPDB.com Also while looking at your pic, I noticed you have a bent pin at CN1 speaker output connector at the top. That could be your problem right there.
[quoted image]

Thanks for the info. I should have mentioned in my original post that the picture isn't my actual board. I wasn't near my machine at the time of posting to take a picture. Here is my actual sound board. I guess I'll try ordering a new amplifier chip for the left channel and see if that helps. Is there a way to test an amplifier chip to see if it's bad or not?

IMG_5266 (resized).JPG
#4 4 months ago
Quoted from Jakers:

Thanks for the info. I should have mentioned in my original post that the picture isn't my actual board. I wasn't near my machine at the time of posting to take a picture. Here is my actual sound board. I guess I'll try ordering a new amplifier chip for the left channel and see if that helps. Is there a way to test an amplifier chip to see if it's bad or not?
[quoted image]

You could examine the pins with an oscilloscope. If it isn't the amplifier IC, it could be a capacitor problem or even something else.

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