What is the DC voltage on the following transistors?
Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage.The amp will need to be powered up. Insert a 10 amp fuse in the B+ line and have all transistors tightly clamped to the heatsink.
Q207
Leg 1:
Leg 2:
Leg 3:
Q212
Leg 1:
Leg 2:
Leg 3:
Q208
Leg 1:
Leg 2:
Leg 3:
Q214
Leg 1:
Leg 2:
Leg 3:
Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage.The amp will need to be powered up. Insert a 10 amp fuse in the B+ line and have all transistors tightly clamped to the heatsink.
Q207
Leg 1:
Leg 2:
Leg 3:
Q212
Leg 1:
Leg 2:
Leg 3:
Q208
Leg 1:
Leg 2:
Leg 3:
Q214
Leg 1:
Leg 2:
Leg 3:
Here's what I got:
Q207
Leg 1: 4.8
Leg 2: 24.7
Leg 3: 0
Q212
Leg 1: 4.7
Leg 2: 24.6
Leg 3: 0
Q208
Leg 1: -25.7
Leg 2: 0
Leg 3: -30.7
Q214
Leg 1: -27.2
Leg 2: 0
Leg 3: -30.5
I held the lead on each leg until the voltage was pretty steady, which took a few seconds. But the protect LED didn't come on.
Q207
Leg 1: 4.8
Leg 2: 24.7
Leg 3: 0
Q212
Leg 1: 4.7
Leg 2: 24.6
Leg 3: 0
Q208
Leg 1: -25.7
Leg 2: 0
Leg 3: -30.7
Q214
Leg 1: -27.2
Leg 2: 0
Leg 3: -30.5
I held the lead on each leg until the voltage was pretty steady, which took a few seconds. But the protect LED didn't come on.
Those voltages are about what I'd expect. It appears that the drivers survived.
Do you have an oscilloscope or any way to trace an audio signal?
Do you have a test tone DC or a sine wave generator?
Do you have approximately ±15 on the power supply pins of U103?
Do you have approximately ±6 on the power supply pins of U203?
Do you have an oscilloscope or any way to trace an audio signal?
Do you have a test tone DC or a sine wave generator?
Do you have approximately ±15 on the power supply pins of U103?
Do you have approximately ±6 on the power supply pins of U203?
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