Onkyo TXDS-797 Service manual

TX-DS797 and TX-DS898

Preparation to work or troubleshoot on DSP as well as possibly power
amplifier or other input function PCB assemblies. The process will take 3
to 8 minutes.

Pre-amplifier PCB / Volume is removed to create
troubleshooting access for the DSP component side.

Front

Original position of blue
connector wire for P9502

Rear

TX-DS797 and TX-DS898

When attempting to repair or trouble shoot DSP, Video PCB and all input
PCBs, follow disassembly given below.

Disconnect P9502 connector wire (Blue) and then remove all 8 screws holding heat
sink to the bottom chassis. Remove white ribbon connector from P7701A DSP side.
Disconnect all speaker connectors from P6810, P6812, P6008A and P6008B.
Remove secondary power connector from P6951 location found on power relay PCB
assembly.

D

S

P

Set power amplifier on it side as seen above.

TX-DS797 and TX-DS898

Secondary power connector from P6951
being disconnected. JL6953B and P6952A
found to the right may be disconnected.

With the power amplifier set on its side, the input PCB assemblies are
exposed for easy troubleshooting and repair. Individual PCB may be
checked without the other. S-video may not work without the composite,
but if the composite works the problem with S-video is simple to asses.
Speaker relay is fully functional even though there is no audio passing
through as main amp is disabled. For additional ease Tuner module and
its support PCB may be removed.