Helios
Active Member
I have just finished recapping my AU-919, replacing all electrolytics except the big oval ones. I have a strange behaviour when I put the main switch ON; I see the relays going to ON, then to OFF (protector mode) and ON again afterwards; needless to say that there is a scratch to the speakers when it is happening. If I wait a bit, then put the switch to OFF and then to ON, sometimes the ampli goes directly to the protector mode and then the relays are ON. When I inspected the pics that I took while doing the job, I observed that on the protector board (F-2840) the C03 and C04 were installed in reverse originally (see pics, before and after); on the schematic it is indicated for C03: 220 uF 6,3V (B.P.). I do not know what the BP stands for. Could it be the cause of this behaviour ? I must add too that on the Pre-Amp P/S board (F-2844), the C05 and C07 were originally installed in reverse; I installed the replacements like the SM and indications on the board told to do.
My second problem is what prompted me to do the recap process; I had lost the right channel. While recapping I inspected carefully the driver board (F-2839) and saw that one cap was doubful C38: 0,001 uF 100 V mylar (see pic). I tried hard to find replacements here locally but to no avail. I resorted to exchange the C38 with C37 just to make the test, and in fact now the right channel works while the left one is gone; so that must be the origin of the problem, no ? Can someone confirms that it might be possible, or do I have to look elsewhere ?
Helios
My second problem is what prompted me to do the recap process; I had lost the right channel. While recapping I inspected carefully the driver board (F-2839) and saw that one cap was doubful C38: 0,001 uF 100 V mylar (see pic). I tried hard to find replacements here locally but to no avail. I resorted to exchange the C38 with C37 just to make the test, and in fact now the right channel works while the left one is gone; so that must be the origin of the problem, no ? Can someone confirms that it might be possible, or do I have to look elsewhere ?
Helios