Arcade Collecting > Pinball

williams comet system 9 power supply +5 volts reads 8 HELP

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hawk007:
hello everyone.....I am at a loss.  My power supply for my comet says all voltages are good but the 12 volts+ is a little low at 11.57 and the +5 is at 8 volts?  I have replaced both voltage regs. twice and the cap at c-10 and the bridge rectifier.  But still the same thing?  Please help!

Ken Layton:
Caps C7, C8, or C9 may be open. IC1 or the resistors around it may be bad.

hawk007:
thanks sooo much i will replace thiose now and let you know how it goes.. Thanks soooo much

hawk007:
o.k. i replaced all that stuff and a couple diodes as well and still high 5 volts. All resistors test good and voltage regs have been replaced three times now and still the same thing.  5 reads 8 or 9 and not 5 volts!  Help !!!!

Ken Layton:
Doesn't this board use a mica insulator between the regulator transistor and the heat sink?

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