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Tape slow speed

I found this cassette player in my grandmas garage, and the speed is really slow, i'm thinking its the motor.

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: Sony Walkman cassette tape player operating at slower speed

If this is the WMD6C then it is servo locked and can be fine tuned with the pitch control on the back of the unit just turn the switch to on then adjust to preferred speed.
Dave, Electronic Doctors email eledocs@hotmail.com

Posted on Apr 03, 2009

wwga
  • 106 Answers

SOURCE: Walkman Cassette player playing slowly

the belt is rot.

Posted on Mar 22, 2012

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Why is my tape deck running slow


Hi there! There are five general causes for cassette tape machines to run slow 1) motor faulty Check the motor governor electronics 2) Belts and rubbers worn or slipping 3) Lubrication of mechanism bushes 4) Cassettes binding in their cases this is quite common 5) If there is a solenoid or motor that do the work of the moving of capstan roller then there can be something wrong with that it can be binding on the sliding mechanism

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The speed should be adjustable but the common practice is to use a frequency counter and test tape or test tape and wow and flutter meter. I look at this from a Technician's point of view as I have been fixing units for 45 years so far. Once the motor speed control is found it does not take too long. Sometime it take more time taking the cover off.

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I would like to make this work again.I have cleaned the rollers with alcohol. When playing a tape the sound starts to warble as the speed varies, then the speed slows and it stops. It is plugged in. Is...


Il rimedio c'?, ma dovrei esaminarlo personalmente. La mia email " doctor.walkman@gmail.com " The remedy is there, but I consider it personally. My email "doctor.walkman @ gmail.com"

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5 Answers

Cassette Player


Motor speed needs to be regulated by PWM. Reducing the current (with a resistor) actually lowers the torque - which, with a given load, does result in reduced speed - however, different length tapes (60min vs 90min), as well as different quality, and even current position in the tape, will change the load and hence the speed. You need to regulate the speed via PWM. It's sometimes done on a small board built into the motor, in which case you'd have a round hole into which you could insert an INSULATED screwdriver (tiny flathead wrapped most of the way in electrical tape works). It may be done on the main board, in which case you could find a pot conveniently labeled "motor speed", or perhaps "pulse width" or "pwm" or something to that effect. Find it, mark its current position just in case, and turn it to see if it gets the effect you're after. And there are some tape decks in the world with no speed adjust - they are designed with a specific speed motor and the sizes of the wheels and gears are calculated for that speed. Also there may be a mechanical fault/malfunction causing the speed problem. An initial check and thorough cleaning of the capstan and pinch roller should be done. If there is a buildup of tape oxide or a piece of a broken tape wrapped around the capstan, the tape travel will be too fast (do to the effective increase in capstan shaft diameter). If the pinch roller isn't fully engaging, the tape can be getting pulled onto the takeup spool at a speed faster than the capstan control. A different source of trouble might be a slip clutch (possibly an idler/clutch assembly)which is binding, or otherwise not functioning the way it should. Another type of motor doesn't have it's speed controlled by an internal or external voltage.. instead, the motor has an internal centrifugal speed controller. This type of motor can be found on older tape decks, and might not have been utilized more recently. Good luck

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