DIYbanter - View Single Post - JVC RX-807V receiver. One channel distorted when SEA is enabled.

David Farber

wrote:
As far as I can tell, the components in question are not custom. IC
503 is a standard dual op-amp whose DC output voltages start
creeping up until it reaches Vc or 12 volts and then the positive
half of the signal is clipped.

there are either schematic documentation errors or design errors re
IC 503

The + inputs to IC503 don't appear to have ANY DC connection, all
connections are via caps. The DC voltage on the + inputs is
therefore undefined. This is is either a design error or a
documentation error. If DC voltage is being set by the the cap
leakage, then that is your problem. Use a 100K connected to a
variable DC supply and see if you can't move the DC voltage to the
correct value. If you can, then you should be able to figure out the
rest.
m

I was wondering the same thing! I will check and report back to you.

Thanks for your reply.
--
David Farber
Los Osos, CA