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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc.

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Old 26th Nov 2019, 12:46 am   #1
stacman
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Default Pioneer CTS 710, runs too fast.

I picked up a pioneer CTS 710 for a bargain price last year, worked ok, but a couple of weeks ago, chewed a tape, a check found both capstan belts reqd changing, belts ordered and arrived and fitted, yes I ******** up the door opening/closing timing, but thanks to the web, that is now sorted, opens, closes, takes the tape really smoothly, put mechanism back into place, connected up, and run on test with covers off, plays back, only problem is it plays back way too fast, tried adjusting the speed control on the motor, but it only makes it faster, really odd as it wasn't doing this until the belts went soft, so I'm at a bit of a loss, new belts don't appear loose, the deck uses the pioneer reference Z mechanism, could the pinch roller not be engaging properly?, any ideas??
Regards, Alan.

Last edited by stacman; 26th Nov 2019 at 12:47 am. Reason: Sp
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Old 26th Nov 2019, 9:36 am   #2
vidjoman
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Default Re: Pioneer CTS 710, runs too fast.

If it was correct before you changed the belts then it's most likely something to do with the work that you did. Adjusting the motor speed should not be necessary and altering has now made your repair harder as you now have to get it correct again.
I've often seen belts running on the edge of a pulley and making the deck run fast.
It could be a pinch wheel fault, but only you can determine that as you have the deck in front of you. Careful observation is what is needed to sort this one out.
It could be a faulty motor that runs fast and the slack belts compounded the error by slipping and leading you to think that the speed was good prior to changing the belts.

Last edited by vidjoman; 26th Nov 2019 at 9:38 am. Reason: added info
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Old 26th Nov 2019, 12:06 pm   #3
stacman
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Default Re: Pioneer CTS 710, runs too fast.

Thanks VJ, pretty sure the belts are correctly aligned, running centrally, a further dig on the web and maybe a pinch roller pressure issue, this mech is one of the better ones, but obviously complex, the cam that closes the door then pulls the head/capstans up if there is a tape inserted, not sure if if finally ‘snaps’ into place or just softly pulls into place, its a shame as it’s a nice machine, going to have a further look this evening hopefully, it does work so that’s a start,
Regards, Alan.
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Old 26th Nov 2019, 11:03 pm   #4
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Default Re: Pioneer CTS 710, runs too fast.

You need to ascertain whether the speed is 'up' by a fixed rate, or varies (e.g. with tape position). A pinch roller not engaging will give very uneven speed, especially beyond the first ten mins of tape. Put the tape in a few mins from the end of a side and see if it struggles.
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Old 27th Nov 2019, 12:12 am   #5
stacman
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Default Re: Pioneer CTS 710, runs too fast.

Hi Ben, The speed is constantly fast, ‘pinky and perky style, Another look this evening and the belts are installed correctly, tension looks good, the speed just runs fast not like a slipping pinch roller, can only assume that the motor has a component fail or go out of spec when the original belt jammed, so looks like a motor tear down, or a replacement, it’s a 12v ccw type so on the lookout for something that may be suitable.
Regards,
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Old 2nd Dec 2019, 12:47 am   #6
stacman
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Default Re: Pioneer CTS 710, runs too fast.

Removed the motor and managed to get the back off and see the internals, it’s got damaged, Looks like a resistor has blown, and the field coils look odd as 2 have darker coloured windings, I can only assume that is when the belt jammed the motor, the belt went soft and wrapped around the motor pulley but it didn’t break and that stopped the motor rotating, and as this is a deck where the capstan is running from power on, I’m not sure how long it had power,
Regards.
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Old 2nd Dec 2019, 1:00 am   #7
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Default Re: Pioneer CTS 710, runs too fast.

You may get away with changing the caps (one looks very black!) and IC, but those delicate motor brushes look a bit bent, you may be able to straighten them with tweezers.
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Old 2nd Dec 2019, 7:59 am   #8
stacman
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Default Re: Pioneer CTS 710, runs too fast.

Hi Ben, I did wonder that, but if you look closely at the small resistor next to the black cap, it looks like a black dot on it, it’s actually a small hole in the side of it, which is what I think has made the cap black, also the field coils being a different hue, having said that the motor worked!, and it did speed adjust only even at its slowest setting, it was too fast, so the IC maybe ok.
Regards, Alan.
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