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Williams, 1985You're currently viewing posts by Pinsider PINTEC.
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Quoted from Mibagent_x:So socketed and replaced the op amps with no change. I am starting to check the resistors. So far R14 doesn't make the values of R1-3. Mind you I don't know what the values are supposed to be but it is half of what the others are. So I may be going to my local electronics store and gets some resistors and probably caps while I am at it.
Bypass the speech board by adding a jumper at W10 check for sounds to return to loud.
if not suspect amplifier failure
Quoted from Mibagent_x:CPU sounds are normal volume. Seems to me like speech is not getting amplified and or mixed correctly.
Amp and cpu sound section ok:
Suspect a faulty ribbon cable.
Check speech clock and speech data signals are present which come from the PIA U13 on the cpu to U1 on the speech card does the faint speech sound good?
there isn't much left except PIA U13 and U1 very rare the 5k pot is not functioning.
also double check replaced socket pins on op amps for shorted neighboring pins.
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Chicago, IL