Hi all. Have an Arcam A22 with two separate problems, maybe three. First two result in protection fault problems.
When I disconnect the preamp from the main board, as stated, protection fault, unless I warm up Z9. Then the power amp runs fine. Connect the preamp, Either by internal switch or RCA cable, and fault returns. Running pre out to separate amp yields a low signal with no volume control. I can however hear clicking through the speakers when turning the volume control in either direction. Using RCA to connect pre to main gives immediate fault whether connecting right or left channel.
Thinking the most likely cause for preamp failure in both channels is the one ic common to both sides. + and -15v are getting into the board, but I haven't trace any further. Any other ideas?
So, as I said, seems like two different problems. Z9 all on its own, and the preamp board. Feel free to suggest something else.
Z9 seems to be a death sentence based on cost and availability. I'm crazy enough to consider grounding pin 9 to disable the fault circuit. Seems like I have a boat anchor if I don't. Any opinions here?
Oh yeah. That other problem. Left side, main speaker output. 9k resistance across output, any and all conditions. All three other speakers measure open circuit. No obvious audible problem.
Help me please!!!
When I disconnect the preamp from the main board, as stated, protection fault, unless I warm up Z9. Then the power amp runs fine. Connect the preamp, Either by internal switch or RCA cable, and fault returns. Running pre out to separate amp yields a low signal with no volume control. I can however hear clicking through the speakers when turning the volume control in either direction. Using RCA to connect pre to main gives immediate fault whether connecting right or left channel.
Thinking the most likely cause for preamp failure in both channels is the one ic common to both sides. + and -15v are getting into the board, but I haven't trace any further. Any other ideas?
So, as I said, seems like two different problems. Z9 all on its own, and the preamp board. Feel free to suggest something else.
Z9 seems to be a death sentence based on cost and availability. I'm crazy enough to consider grounding pin 9 to disable the fault circuit. Seems like I have a boat anchor if I don't. Any opinions here?
Oh yeah. That other problem. Left side, main speaker output. 9k resistance across output, any and all conditions. All three other speakers measure open circuit. No obvious audible problem.
Help me please!!!
This thread might help. There are also a couple of other threads on this board regarding the a22. From the thread, it seems that the 122 is closely related to the alpha10. Here is the SM for that (the a22 SM doesn't seem to be available),