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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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15th May 2021, 12:08 pm | #1 |
Pentode
Join Date: Oct 2016
Location: Ware, Herts, UK
Posts: 169
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Sony C20 Betamax Unlace issue
Hello everyone,
https://youtu.be/Fcw9TxgvKJA I have a lovely Sony C20 that has an intermittent fault. All functions are fine except on-occasion, unlace is leaving tape loose in the machine. This only seems to happen if PLAY/FWD is in use before the eject button is pressed. It is also much more frequent a problem when the machine is warm/has been playing tapes for 15mins+ Interestingly if I get the idler to be on the supply spool when eject is pressed, the problem doesn't occur. I have oiled the lacing ring AND the supply/take-up spools plus checked the idler - seems to flip about with ease. Any ideas? I've seen this on the Sanyos but not on the Sonys. Thanks in advance Rob |
15th May 2021, 12:38 pm | #2 |
Octode
Join Date: Jul 2006
Location: Perth, Western Australia
Posts: 1,965
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Re: Sony C20 Betamax Unlace issue
There's a known issue with the pendulum idler mechanism in these models which can be hard to repair these days. There are some details on the Betamax Palsite.
https://www.palsite.com/slc20tech.html |
15th May 2021, 4:25 pm | #3 |
Pentode
Join Date: Oct 2016
Location: Ware, Herts, UK
Posts: 169
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Re: Sony C20 Betamax Unlace issue
Thanks Timtape. I did look there and they talk about checking a resistor and a transistor (2SC10613). They don't say what board this is on and I don't have the service manual for the C20.
I don't think it's the idler (pendulum) bearing but I will check that out too |
16th May 2021, 7:56 pm | #4 |
Heptode
Join Date: Mar 2015
Location: Lefkada, Greece
Posts: 969
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Re: Sony C20 Betamax Unlace issue
Hi Rob
Q334 (2SC1061) is located in the SS-16 (syscon & servo) board. Regards, Fivos |
16th May 2021, 10:14 pm | #5 |
Dekatron
Join Date: Aug 2006
Location: Madrid, Spain / Wirral, UK
Posts: 7,484
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Re: Sony C20 Betamax Unlace issue
I had this problem with a c30. Intermittent loop of tape on eject. I had to lubricate the idler on it shaft and also apply heat to it/bend it as it was slightly warped and wasn't always making proper contact with the spool table.
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Regards, Ben. |
17th May 2021, 8:00 am | #6 |
Pentode
Join Date: Oct 2016
Location: Ware, Herts, UK
Posts: 169
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Re: Sony C20 Betamax Unlace issue
Fivos/Ben,. Thank you. I'll investigate both avenues.
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