Macdude
Hi /on/ Fidelity
A few weeks back I found this CA-1000 in the trash down the street. I found it had a toasted resistor on the right channel and someone had replaced a 5a fuse with a 14a, leading to further damage. Upon further investigation, I found the outputs and drivers on the right amp board were shorted. Fusistors tested close to spec except for one on the power board that was open. Replaced them all to be safe. Found a burned up ground/earth trace on the function board and fixed it (this was throwing off my rail voltage very badly). Now I'm down to the last problem.
On the right amp board, I have good +/- rail voltage on both ends, however, I get no measurement between TP 3 and 4 (idle current adjustment cannot be performed). I also only get 11.6vdc between TP 1 and 2 (15v adjustment). I can't go any higher than 11.6vdc.
The amp comes out of protect every time. I replaced the Class A/B microswitches early on. Voltages are off the same amount in A/B mode. As of this post, I have replaced every transistor and electrolytic on that amp board except for the K34 with no noticeable change. All resistors on this board test in spec out of circuit. I'm running in circles.
All measurements are in vdc in Normal mode
On the right amp board, I have good +/- rail voltage on both ends, however, I get no measurement between TP 3 and 4 (idle current adjustment cannot be performed). I also only get 11.6vdc between TP 1 and 2 (15v adjustment). I can't go any higher than 11.6vdc.
The amp comes out of protect every time. I replaced the Class A/B microswitches early on. Voltages are off the same amount in A/B mode. As of this post, I have replaced every transistor and electrolytic on that amp board except for the K34 with no noticeable change. All resistors on this board test in spec out of circuit. I'm running in circles.
All measurements are in vdc in Normal mode
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