View Single Post
  #16   Report Post  
Posted to sci.electronics.repair
[email protected] makolber@yahoo.com is offline
external usenet poster
 
Posts: 810
Default JVC RX-807V receiver. One channel distorted when SEA is enabled.



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