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Sony TC-355 won't record but erases.

F

Fadedtubez

New Member
I have a Sony TC-355 that I am currently servicing. When I switch it into record mode, the VU meters stop moving, and I can't hear anything through the source or tape outputs. I have used contact cleaner to clean the record switches and the source selector switches. I would greatly appreciate it if someone could point me in the right direction in getting this machine working.
 
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Welcome to AK

Yes, first line of attack is cleaning switches and possibly relays (if used). Best to get the service manual from HiFiEngine. Create an account and download.

Lots of great information is available from the sticky: https://audiokarma.org/forums/index...intenance-of-cassette-and-reel-to-reel.51539/

Be patient and read, read, read.

Might not be a bad idea to confirm you have the deck correctly connected to your source (preamp\integrated amp\receiver), with a known working recorder, for confirmation. If unsure, consult the user manual for your preamp\integrated amp\receiver for correct hook up.
 
Before you go looking elsewhere for problems, what contact cleaner did you use? Only De-Oxit will remove oxidation, so if you used something else, try De-Oxit, making sure you inject it into the actual body of the switch in any opening or gap you see in the metal cover. It is unusual to lose both channels like this, oxidized switches are your most likely cause. If it was a component, they rarely fail on both channels. The next culprit would be the power supply to the record amp.
 
dr*audio said:
Before you go looking elsewhere for problems, what contact cleaner did you use? Only De-Oxit will remove oxidation, so if you used something else, try De-Oxit, making sure you inject it into the actual body of the switch in any opening or gap you see in the metal cover. It is unusual to lose both channels like this, oxidized switches are your most likely cause. If it was a component, they rarely fail on both channels. The next culprit would be the power supply to the record amp.
Click to expand...
I used a cheap CRC contact cleaner and don't have access to De-Oxit at the moment. I'll pick some up soon. I'm going to check the record amp PSU with my oscilloscope soon and report back. Where on the board would I check that? Would I measure the collector input of a transistor or something receiving power in the circuit or is there somewhere better to measure?
 
Fadedtubez said:
I have a Sony TC-355 that I am currently servicing. When I switch it into record mode, the VU meters stop moving, and I can't hear anything through the source or tape outputs. I have used contact cleaner to clean the record switches and the source selector switches. I would greatly appreciate it if someone could point me in the right direction in getting this machine working.
Click to expand...
Check at the emitter of TR303. There are no voltages marked on the schematic, expect between 12V - 24V. There is an unmarked 47 Ohm resistor in series with the emitter. If you have voltage on the emitter, check on both sides of the 47 Ohm resistor.
 
dr*audio said:
Check at the emitter of TR303. There are no voltages marked on the schematic, expect between 12V - 24V. There is an unmarked 47 Ohm resistor in series with the emitter. If you have voltage on the emitter, check on both sides of the 47 Ohm resistor.
Click to expand...
I feel dumb for asking this but how do I figure out where the transistor is? I can't lift any of the boards out to look at the front and the backs of them aren't labeled.
 
I found a 47 ohm resistor and I'm getting around 26 volts on both sides of it. I'm assuming that's the one? What do I do now?
 
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