Question about Nakamichi Audio Players & Recorders

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I have a Nakamichi 700 Mk 1 cassette deck. Everything works fine apart from it chews tapes after about 10 minutes of playing. Afer a few minutes of playing, a loop of loose tape is generated between the capstans. This eventually wraps itself around the capstan. I have replaced both the centre belt & capstan belt but its made no difference. I understand that the machine is designed to maintain tension across the heads. This implies that the pulley/flywheel for capstan 'A' (part no. CA-5006) rotates faster than flywheel 'B'. I have measured the diameter of the pulley for both flywheels. Pulley 'A' is 47.20mm diameter and pulley 'B' is 47.00mm diameter. Therefore pulley 'B' will rotate faster than pulley 'A' and a loop of tape is bound to form between the capstans. Where am I going wrong? Can you help? Calum (UK)

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  • Man-Pig Dec 11, 2008

    I have tried the switch on & off solution and it makes no difference. Please remember, being a 1974 product there are virually no silicon chips in the Nakamichi 700 cassette deck. Thanks.

  • Man-Pig Dec 11, 2008

    Hi PuerkoNess,



    The motor appears to be fine. There are no funny noises from the mechanism but both flywheels do appear to be running eccentrically by the tiniest amount - flywheel B being the worst. There is no discernable play when trying to wiggle flywheel A from side to side but there is the slightest amount of play between the capstan shaft and bearing on flywheel B. Is this likely to be the problem? If so, are new Capstan Flange Holder Assembies available (part # CA-5160)? Thanks.

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Hi
This may be a reel sensor problem, or the rotation of one of the reels is stopping for some reason. Most of the time, these faults are mechanical. There can be worn belts, or drive wheels, or gears, and etc. Sometimes there are faults in the electronics where a sensor is not being read properly. 

The unit should be properly checked to evaluate the fault. 

Posted on Dec 11, 2008

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First let me say Hi!! It's very nice to see you on this site Calum, I've seen your work and im a fan.
Now let's talk about your issue. It seems to me that you might have a problem with the motor that controlls the pulleys, it could be either one. Or you might have a loose pulley, again it could be A or B. Try to stare at them in action to see which one it is, and also listen for any strange sounds they might make when rotating.. Good luck!


-PuerKoness!

Posted on Dec 10, 2008

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Hi,I would suggest you to first trying unplugging/ switching off your device for 5 minutes. This restores and refreshes the device. Go for it
Let me know if this works, if it doesn’t then I’ll provide some other alternative solution.
Thanks


Posted on Dec 10, 2008

  • futureloginn
    futureloginn Dec 11, 2008

    please go to the following link for service manual ---

    http://stonessoundstudio.com.au/stone/na...

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