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Technics RS-CH770 double tape decks not spping round/working

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  • andy451 Aug 13, 2008

    technics RS-CH770 tape decks not spinning round/not working

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Please check Capstan Motor working / rotating. If no, check its supply volts. If yes, then check Capstan Belt and FR Belt, should not be any cracks on it. If found cracks, please replace them.

Posted on Aug 13, 2008

  • Shahid Electronics
    Shahid Electronics Aug 15, 2008

    Hello,

    Hows your Technics RS-CH770 ? is it working fine now? please let me know.

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Most of the time this is the belts being to loose. You would need to get the exact belts to replace them with. Sometimes you can have similar problems with the switches that detect when a tape is inserted into the deck. Those switches are at the top of the tape mech and the top of the tape would depress the switches. They detect when a tape is inserted and if it is a recordable tape. Those switches sometimes need to be cleaned, but it is not an easy job. The belts are not easy to replace as well.

It is very rare for the motor to be bad, the belts and the switches are always the most likely problems.

You can always take the top off the unit and look to see if the belts are slipping and not turning the flywheels when you put a tape in and press play. If you hear the motor running and the belts are not turning, you need new belts. I can help you with the proper part numbers for the belts and give you a diagram of how the belts go around the flywheels if my solution is accepted. I repair these and many other types of audio equipment for a living and can offer you all the help you need.

Posted on Aug 13, 2008

  • Georgi Feb 05, 2013

    What are the diameters of the two belts?

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Technics RS-CH770 double tape decks - 4831b08.jpg70c6b10.jpg

Sounds like either something is wrong with the control circuit, the motor, or the speed sensors.
Look at these images of the turntable and platter and then check your turntables to see if the parts indicated by the red arrows are damaged. If not, I'm guessing there's something wrong with the speed control circuit. Things like that are kinda hard to diagnose without measurements though. It's rare that these things happen, but they can be pretty costly to fix.


thanks
good luck

Posted on Aug 13, 2008

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The most common cause of this is the belt having slipped off of the motor or gears instide the unit. As the belts age, they tend to get a bit stretched and don't rebound as well as new ones. This unit uses 2 or 3 belts that should be generally available for about $2 each. In order to change these belts the mechanism will need to be removed from the unit. If you haven't done this in the past, it could be a bit tricky. Figure on a total repair cost of about $75 if you were to bring this to a shop.

Dan

Posted on Aug 13, 2008

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Go here
www.donberg-electronique.com/warehs/group11.htm

Posted on Aug 13, 2008

  • ritchie dempacco
    ritchie dempacco Aug 13, 2008

    check tape deck motor belt if its broken or change the motor

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From link below you can download your service manual.
Service manuals usually include troubleshooting tips and usefull technical informations; Good luck!
http://eshop-manuals.com/product_info.php/products_id/72884

Posted on Aug 13, 2008

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