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(Topic ID: 208261)

LAH dryed caps. Help


By DEN

2 years ago



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  • 14 posts
  • 6 Pinsiders participating
  • Latest reply 2 years ago by mikat11
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#4 2 years ago

Power supply board ,replace caps C1,C2,C3,C7. These are near the big aluminum heat sink and dry out over time and it takes a minute or more for them to charge up and supply 5 volts to the CPU board and the sound board. C2 is especially prom to leakage and failure. A very common problem on Data East power supplies.

#7 2 years ago

Like I said before. C2 is prone to leakage and failure. The heat from the 5 volt regulator heat sink is hard on poor little C2 and replace C1 C3 and C7 also.

#9 2 years ago

Same uf value, higher voltage is ok for any of those 4 caps. For example C2 is 100uf 25 volt. A 100uf 35 volt will work fine. Low voltage due to bad caps is the problem here. On initial power up the voltage in the 5 volt circuit is very low, probably near 4 volts. After a couple minutes or so the bad cap will charge up to near 5 volts and the CPU will power up like it should,then the sound board shortly after. Most likely C2 is the root of the problem and the other 3 caps need replaced because they are old and its a good preventative maintenance.

#14 2 years ago
Quoted from DEN:

Well that sounds risky with the fire. Do you have a pic of the location? Whitch cap it is?

C7

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