3801 denon receiver

[JR]

OK, read the other post which didn't really express the "two-tiered"
estimate. I can understand the possibility that the shop, after not finding
any obvious cracks, etc gave the estimate to replace the micro as an initial
step. Done this myself sometimes, usually after a lightning strike. I'll
tell the insurance company it's so much to replace the micro, win, lose or
draw - then we'll see what doesn't work after that.

Mark Z.

well i have pulled receiver apart, and have been checking traces with
ohm meter. I have traced voltage from ac input all the way to a
capacitor right before the relay, i have voltage on 1 side of the cap
but nothing on the other side, i checked the cap with a ohm meter also
it shows nothing..according to the schematic the power has to come
through this cap and relay before going into the fuses...could the c525
cap be causing all this problem

 

[JR]

well i have pulled receiver apart, and have been checking traces with
ohm meter. I have traced voltage from ac input all the way to a
capacitor right before the relay, i have voltage on 1 side of the cap
but nothing on the other side, i checked the cap with a ohm meter also
it shows nothing..according to the schematic the power has to come
through this cap and relay before going into the fuses...could the c525
cap be causing all this problem

i just found several problems....it looks like lightning must have got
this thing, or the guy majorly shorted it out..i checked readings
against a good working receiver...found mini trans bad, 1 bad cap,
several resistors bad, etc etc...

 

[Mark D. Zacharias]

JR wrote:



i just found several problems....it looks like lightning must have got
this thing, or the guy majorly shorted it out..i checked readings
against a good working receiver...found mini trans bad, 1 bad cap,
several resistors bad, etc etc...

Boy, I'm really beginning to hate this service manual. Well, you can try
subbing in a dc voltage at the 5 volt regulator, and see if the micro
responds when you press the power button.

You can sub in 10 volts or so at C522, or if the IC protector is open, you
can sub in right there at IC 501.

Mark Z.