Would like to see the manual on the technics sa-dx750 5.1 channel receiver

question edited for clarity and toss in a load of CAPS.
Question moved from Cars and Trucks.

Replacement remote control

https://www.google.com/search?q=technics+sa+gx530+remote+replacement

Technics SA-GX530 Service Manual

ManualsLib https://www.manualslib.com > ... > SA-GX530
View and Download Technics SA-GX530 service manual online. AV Control Stereo Receiver. SA-GX530 stereo receiver pdf manual download.
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Technics SA AX540 Service Manual free download schematics datasheets...
This shows all the parts. Check for separate channel supply and also bad capacitors.

200watt max , will give you a continue of about 60watt continue and i tead it's nice sounding for the money....

the service manual http://www.hifiengine.com/hfe_downloads/index.php?technics/technics_sa-500_service.pdf

May just be bad connections on the speaker relay. Flip the main board over, and check those connections. It is pretty common on these older models.

if any one of the channels was shorted out, even momentarily, that channel's output transistors would likely be blown causing it to stay in protection mode. (or overload as you put it). Time to visit the repair shop.

bad powersupply.

For the question at the top you most likely blew your computer chip on the Technics sa 810, we have 2 of these receivers and one lost it left channel and the green auto light went out, we have taken it to several places and they ended up having to turn down the power. now it is working great sounds the same just needs more volume level, but it ended up costing $500 CAD, you can't get the auto to work any more, you will most likely need a new stereo, The Technics SA 810 is an awesome receiver, good luck fixing it

Use a multitester to check the amps then you can find which amp it is.Under the cover youll see two boards on a aluinum plate.

check inside to see if you have a blown fuse on the left channel