This amp suffered multiple problems including failed opamps and channel 4 output TIP35/36 failures. Open base (3.3ohm) and emitter (0.1ohm) resistors. Someone previously bought ST brand TIP35/36 but likely got stuck close to where I'm stuck now. The previous repair removed all the drivers which are TIP41/TIP42, B600/B631 and 1023/1027.
I'm working on Channel 4 now. There is no bottom waveform. I tried swapping out many parts and testing parts and cannot find the solution.
Is there a schematic available for this amp by chance?
Audio signal comes in clean on the base of Q403/Q404/Q405/Q406 but then immediately gets clipped at the emitters. I swapped out FR with 3B. BR Im not sure what that is. I tried 1B transistors but the amp stayed muted.
I'm working on Channel 4 now. There is no bottom waveform. I tried swapping out many parts and testing parts and cannot find the solution.
Is there a schematic available for this amp by chance?
Audio signal comes in clean on the base of Q403/Q404/Q405/Q406 but then immediately gets clipped at the emitters. I swapped out FR with 3B. BR Im not sure what that is. I tried 1B transistors but the amp stayed muted.
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OMG I just fixed the amp. Posting that photo and I see R467 right in the middle of the photo. Blown open. Also R466. Both are 100 ohm resistors.
Amp is acting better now.
I guess if anyone gets one of these, check the 100 (Marked 101) ohm resistors in the channel if output is badly distorted/clipped.
Both CH1 and CH4 now passing clean signal. Moving on.
Amp is acting better now.
I guess if anyone gets one of these, check the 100 (Marked 101) ohm resistors in the channel if output is badly distorted/clipped.
Both CH1 and CH4 now passing clean signal. Moving on.
Many times, a 2D image makes it easier to see something than it is to see when viewing directly (3D).