Where can I obtain a Rotel RX-402 user or service

Service manual says it has already selectable voltage transformer in it having selection of 120V, 220V and 240VAC. Anyway see page 9 of service manual
ROTEL RX-855 Service Manual download, schematics, eeprom, repair info for electronics experts (elektrotanya.com)

No, it has a built in amplifier and can only be used for inputs.

ROTEL hifi RX-950AX owner's manual - AM/FM STEREO ...

https://www.rotel.com > files > product > manuals
PDF
ROTEL hifi. RX-950AX owner's manual. WARNING. TO PREVENT FIRE OR SHOCK HAZARD,. DO NOT EXPOSE THIS APPLIANCE TO. RAIN OR MOISTURE.
9 pages


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“Yamaha RX-V473 AV Reciever how to turn on standby mode?” Download RXV473 service manual and user manual to solve this problem or phone yamaha to call for help.

Some amps have pre-set settings that can be adjusted by the user. You should look in the user manual to see if this is the case. Otherwise it could be a fault.

This is a link to a page that has the manual.

http://rotel.imvoi.com/tuner/rt-961.html

hope that's what you are looking for.

good luck :)

This site has both the user manual and service manual listed for download. It looks likes it's a free site but you need to register.

I don't believe that Rotel service manuals are available outside of authorized service centers. Can you provide us with the problem that you have? Perhaps we can guide you through the repair.

Thanks,
Dan

Unless yuo can find a Rotel authorized service center, you are not likely to find any service information. These units should not be difficult to repair. Their designs are pretty much standard with a few twists. Any shop that handles audio repair should be able to resolve this. If not, please post your location and I'll try to locate a shop for you.

Also, are there any indications that the unit is trying to work at all or is it completely dead?

Thanks,
Dan

Sounds like wiring problems. Unhook everything, then get owners manual for proper instruction

Try only A speakers.