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RE: Make sure to turn the machine OFF when doing it. nt

68.108.173.65

In Reply to: RE: Make sure to turn the machine OFF when doing it. nt posted by Victor Khomenko on January 13, 2024 at 11:10:12

Understood, thanks,

Unfortunately, the decks have been in the closet too long. Working with them this weekend and one playsback great but when recording only one channel records, the other channel is just hiss.

The other doesn't sound great playing, and recording just produces silence, no input shows on the meters when trying to record. But monitoring source input signal is fine.

So I have some work to do. I guess it is amazing after all these years that they work at all. Normally available replacements for the capacitors and transistors for two decks only cost $50 at Mouser, I just did the BOM. I can do the R&R, I am pretty good with soldering and desoldering.

BUT I don't have the knowledge to troubleshoot electronics problems, nor calibrate a deck.

I'll order the parts for two decks and in the meantime unwrap the 909 and keep my fingers crossed.

Plan B would be to try and find a pro and see if I can work out a trade: restore one 707 and take the other in payment.

Follow Ups:

Re: Plan B - Inmate51 08:06:31 01/19/24 (1)
Just fyi, pros don't stay in business by working for non-working "trades". If you find one who does, keep looking.

*********

We are inclusive and diverse, but dissent will not be tolerated.
- Re: Plan B - ltman 22:43:29 01/30/24 (0)
  point taken, hadn't thought of it that way (not being a pro myself :)
Before going whole hog... - Victor Khomenko 11:55:32 01/15/24 (0)
...try the simple procedure that often works.

After many years of sitting idle some contacts both in the switches and in relay might become oxidized and will not make connection when required.

In some cases just exercising them will clear some faults. So keep turning the machine ON and OFF, selecting different modes and some of that function might come back.

Not so long ago I had that happen in the Otari MX-5050, where the speed switch refused to work after years of inaction. Pushing it about 50 times restored the operation.

If that doesn't help then the contact cleaner often work.

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