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Make sure the subwoofer is set to On in the setup menu. Should be able to access this setting from the front panel, using the click wheel and the left/right buttons above the wheel. Push the setup button to get to the right menu. Set subwoofer to 'on' and speaker size to 'small'. This receiver has a fixed crossover, so make sure to turn the crossover setting on the subwoofer to the maximum setting (highest frequency) to ensure no signal is lost.
Try lightly tapping on chassis to see if you can get audio to cut on or off with vibration if you can most likely cause is bad solder connections. This unit is well known for poor solder connections especially around poweramp driver IC's IC701, IC501. Also Electrolytic Capacitors in unit have fluid in them and heat Evaporates the fluid causing them to not operate properly over time . Caps that usually go bad are around parts that run hot like Power amp drivers
Just a couple likely suspects.
Try unplugging overnight to give unit a Good Reset also double check all setup settings.
If you need service manual I may be able to get you one firstname.lastname@example.org
It sounds like you have unit in setup mode. The "L C R" is Left, Center, Right. You can set balance and volume levels of each with this mode.
Use remote to select 5.1 dolby surround to get unit out of 2/1 "stereo"
You should have access to receiver's format from remote or front panel. If the unit was moved around a lot and for a long period, the micro-processor may have locked due to ambient static electricity. Try unplugging unit for seversl hours, then re-try