I got a new RQ 210s after my previous one didn’t work. The problem is this one is suffering from the same problem. No sound during playback and no response during recording. Everything thing seems fine, there is efficiency of battery leakage but I don’t know if this is the cause of the problem. I have tried everywhere for advice and I’m getting no response. Please if anyone has a service manual they can scan or they can fix it for me I’ll ship it to you and we can work out a price or if anyone has a working RQ 210s they don’t mind selling please let me know.
Update: I put some white vinegar on the pcb were I saw noticeable corrosion. I am not getting some cracking and popping during playback and record. Anything else I should do?
The service manual is on Radio Museum's Website, you'll have to add an account to download it. https://www.radiomuseum.org/r/panasonic_rq_210srq210.html The big ole clunky models from before 1979 don't get a lot of love, it looks like even the online Cassette Recorder Museum's site is down, here's the archived version. http://cassetterecorder-museum.com/en/en.html Have you tried the headphone jack for sound? When you try to record, what does "no response" mean? Do the hubs not spin?
No response on the vu meter all I get through the output is light static and what I believe is motor noise. And the one in the radio museum is a circuit diagram which I have no clue how to read. I need a full service manual or the Sams book on how to restore it.
There might not be any other info available, most of these models had everything in plain sight so it's a matter of testing parts of it. A trained technician will start with the easy stuff and drill down. No sound might be a broken wire or connection where the jack is soldered to the board. Look around the board, on the back side, for cracked circles of solder, move the wires going to the speaker/headphone jack when you have power to see if you hear any sound. We need to see photos, there's a 100 different things that could be going wrong so it's hard to diagnose it without more information. The good news is it probably is pretty easy to work on, maybe even fun if you have the time. I like watching My Mate Vince on YouTube, he fixes a ton of stuff, I just pulled this old radio off because it's kind of similar. With a mulit-meter he checks various points around the circuit board to find the area that needs attention.
