I have a Tascam 34B with what was an intermittent and is now seemingly permanent problem. No output, sync repro nor input monitoring.
I have recapped the power supply board and the mon amp board. Power supply seems to be delivering the desired voltages to the desired connections. I have reflowed the mother board. I have hiss in the headphone amp but the individual channel volume controls on each track have no influence on the amount of hiss in the phones. This leads me to believe that the headphone amp is working but no signal is flowing to the output section, neither phones nor RCA outs on the back. It is a global problem, not just one channel. There seems to be one component that is preventing all audio signals from reaching the outputs. When it did work, EVERYTHING worked, again, it was not limited to one channel. I am at a loss. Ideas, anyone? I do have the service manual.
I have recapped the power supply board and the mon amp board. Power supply seems to be delivering the desired voltages to the desired connections. I have reflowed the mother board. I have hiss in the headphone amp but the individual channel volume controls on each track have no influence on the amount of hiss in the phones. This leads me to believe that the headphone amp is working but no signal is flowing to the output section, neither phones nor RCA outs on the back. It is a global problem, not just one channel. There seems to be one component that is preventing all audio signals from reaching the outputs. When it did work, EVERYTHING worked, again, it was not limited to one channel. I am at a loss. Ideas, anyone? I do have the service manual.
