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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 15th Jun 2019, 11:50 am   #1
Michael Maurice
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Default Sony C9 betamax recorder.

This should have been a nice easy repair, no video from the BNC socket, that was repaired in 10 minutes, but then the cassette housing jammed.

I've manage to get the cassette housing out & remove the tape.

Now a cassette loads and lowers onto the deck, but the deck will not load and then the eject light flashes.

I can see no reason why it should be behaving like that, it did work before.

The service manual doesn't really help.
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Old 15th Jun 2019, 12:08 pm   #2
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Default Re: Sony C9 betamax recorder.

Now isn't that interesting, I have a machine here that also does that, and so far it's eluded me as to why. Mmmm...
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Old 15th Jun 2019, 12:41 pm   #3
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Default Re: Sony C9 betamax recorder.

Did the tape unlace before the carriage jammed?

I'm sure there's a microswitch under the carriage, so it's possible that's not being made.
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Old 15th Jun 2019, 1:42 pm   #4
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Default Re: Sony C9 betamax recorder.

How is the tape end detected? is it an led or a lamp? Its over 20 years since I repaired a Betamax VCR. even then I didn't see that many.

Cassette lamp failure would cause machines to cut off Leds would not fail as such but could get clouted by a cassette thereby not pointing at the end sensors or not illuminating due to broken connections.
Loading belt? sometimes would slip before loading was completed ?

May not apply to your machine but worth a quick look?

Rich.
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Old 15th Jun 2019, 2:23 pm   #5
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Default Re: Sony C9 betamax recorder.

Betamax doesn't use lamps or leds. It uses foil which alters the frequency of an oscillator and that sends a signal to the microprocessor.

I've checked the tape in switch and it is working
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Old 15th Jun 2019, 6:36 pm   #6
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Default Re: Sony C9 betamax recorder.

Might be worth a quick check round and make sure none of the circuit protectors have failed, especially the 'n' type that look like transistors, they used to cause various strange faults when o/c.
Greg.
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Old 16th Jun 2019, 11:03 pm   #7
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Default Re: Sony C9 betamax recorder.

hello michael check the unload switch to see if the contacts are ok ,also check the bar that connects underneath the carriage is moving freely ,lastly check the fuse f001 is not open circuit regards David
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Old 20th Jun 2019, 4:55 pm   #8
Michael Maurice
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Default Re: Sony C9 betamax recorder.

I checked the fuses and they were OK more to the point I found that if you operated the cassette housing out of the machine, it loaded and unloaded as if there was a tape.

Put the housing back and it didn't like it!

I eventually found it had something to do with the unlocking bar being slightly bent, I bent it back by pushing hard on it and that seems to have cured it!

BUT

now I have another fault: in both FF or REW the machine operates for a second or two then stops, you can try it time after time but it still stops after a couple of seconds.

Its ok in picture search both ways.

Any ideas?
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Old 21st Jun 2019, 10:18 am   #9
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Default Re: Sony C9 betamax recorder.

Have a look at the Betamax Pal site, according to the fault guide it could be faulty capacitors in the take up/supply spool sensors circuit, CP0005 and CP033. there could be up to ten caps on board SS11, marked IC003/IC002 and /IC610 ,ranging from 1uF -50V to 10uF-50V
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Old 22nd Jun 2019, 3:25 am   #10
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Default Re: Sony C9 betamax recorder.

Yes, i confirmed the SL-C9E need a complete recap of the SS-11 Board.
And look for bad corroded traces, on the Servo board.
This cause trouble on the reel assy.
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