Technics SA-TX50, overload problem

[suiramix]

Technics SA-TX50 receiver is in decent condition , without any visible components damaged and fuses are ok... with no speakers attached, power on (with one relay click) and display the source input for few seconds and immediately show "overload" error message !!! The volume knob is at min. level.
As per service manual (pag.27) the fan motor can be bad ...removed and cleaned the contacts, measured the resistance (24.1 ohm), put it back...same error message!
Question: anyone had similar issue with this Technics model ??? can be the main power IC bad (or just cold solder joints)...
Thanks in advance!

[madan1]

Re: Technics SA-TX50, overload problem

see if the speaker terminals are shorted.
Check the board connections.
Then go to page 37 from the service manual and check if all the V regulators are working fine.
Find the RSNxxxx datasheets and check if they are ok.

[suiramix]

Re: Technics SA-TX50, overload problem

Thanks for reply madan1...I will check the voltage regulators...anyway, I cannot find how to perform a reset/initialize of the microprocessor (usually a combination of 3 buttons)...just unplug the unit for 30 min does not help !!!

[suiramix]

Re: Technics SA-TX50, overload problem

Just a quick update...searching for any faulty components, I did remove the front panel assembly and discovered the connector (C809) has a pin misaligned ...bend back to original position and ...voila ...back to life !!!

[budm]

Re: Technics SA-TX50, overload problem

Good find.
I would also resolder all those pins of the connector too, they will develop cracked rings around the pins and cause intermittent problems.