Great channel you have here, I was a tv-video engineer from 1979 to about 1984, fantastic to see you are so comfortable working on this stuff. Keep it up.👍
Great video, I remember repairing a 3V38 back in the 90's which is very similar in design. That had a strange fault, it would load the cassette but when you pressed play nothing happened apart from a single click from a solenoid, it made no attempt to lace the tape but would sit there thinking it was playing as the play LED would stay lit. I remember it took months to find the solution to the fault, I even replaced the main SYSCON IC but it turned out to be something quite simple. Now 30 years later I can't remember what it turned out to be.
Got one of these, NEC branded though. Exact same inside. Can't get it to take in tapes. As I'm sliding the tape in it won't accept it. I think you had a similar issue when you repaired one of these before. Brill video as always.
Yeah it did briefly do that but it seemed to then sort itself out. Theres a pair of leaf switches, one at either side of the cassette housing, pressed by levers which are operated by metal slid plates on the bottom of the cassette housing. Both of these switched being closed is what starts the cassette motor running to take in the tape. I would check that these are clean and closing properly. You can see them through L or J shaped slots in sides of the cassette housing (looking into the inside from the top).
Apart from the leaf switches of the cassette carriage that go bad, another common problem with these is the ICP circuit protector on the mechacon board that goes open for no apparent reason.
You can actually fix that squaeking noise during lace up by taking the loading rings apart and re-lubricating them. I did that on an HR-D120 (3V35) and it's lacing up silently now, but it's a bit fiddly as you need to take the entire deck out of the machine.
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