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Old 9th March 2012, 12:32 AM   #41
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Has anyone changed any resistors in that area?

The op-amp has almost certainly been damaged by the voltage.
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Old 9th March 2012, 10:47 PM   #42
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Doesnt appear that any resistors have been replaced..

Do i need to follow pin 6 back and check all resistors , and diodes?
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Old 10th March 2012, 08:00 AM   #43
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What is the DC voltage across the speaker terminals?
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Old 10th March 2012, 12:30 PM   #44
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81 volts across speaker terminals

If i remove the op-amp and measure the voltage on pad 6 it drops to 9 volts
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Old 10th March 2012, 04:11 PM   #45
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Do you happen to have a high res pic of the board around the op-amp section?


Also do you know the value of C405 (sits by the op-amps) it is cracked in half
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Old 10th March 2012, 09:04 PM   #46
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Is THIS good enough?

I don't know what C405 is but 0.1uf are commonly used as bypass capacitors near ICs. Since it appears to be very similar to the ones bypassing the supplies for the opto-couplers, I'd assume that they're 0.1uf.
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Old 10th March 2012, 10:21 PM   #47
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Yes the pic is perfect Thanks a ton..

Voltage on Pin 6 is still at 39 volts also voltage on speaker terminals is 39 volts measured directly across them..


Do i need to trace the circuit back from pin 6 and see why its still at 39 volts or any ideas what to look for ?
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Old 10th March 2012, 10:43 PM   #48
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R414 and R412 form a voltage divider that should drop the voltage from what's on the speaker terminals to 1/100th of that voltage. Confirm that the end of R412 that's nearest to the R412 printed on the board is directly connected to the negative speaker terminals. If it is, confirm that R412 is within tolerance.
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Old 8th July 2012, 11:59 PM   #49
bsbpc12 is offline bsbpc12  United States
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Does anyone have a full schematic of the board? FET112 FET110, FET106, FET105, FET111, FET109, and D401 all got burned out. Can't read the D401. Fixable?
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Old 9th July 2012, 01:47 AM   #50
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