Question about Technics SA-DX940

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WHAT IS THE VOLTAGES ON THE 3 FALT WIRE CONNECTION FROM su-X911 T

In the past week my technics twin tape deck RS-RS-X911 has stopped plying tapes in the forward direction on first the secondary deck then on the primary deck. It seems too complicated for me to see why after a little cleaning and very careful lubrication.

BUT I wanted to sort out the voltages on the flat 3 wire cable from the amplifier to the tape deck So I could psossibly take the tape deck only to a repair shop. and use a seperate power supply.
BUT both analogue and digital volt meters just donot seem to give any readings from the cable connections despite the deck is presently working on primary side where reverse replay still works.

What are the voltages for each of white wire , centre balck wire and outside black meant to be ???

What is your opinion of non forward tape play, no right hand spindle turning on each deck ???

Posted by on

  • errolf Jan 29, 2009

    Voltmeters digital and anlogue gives no significant readings. Are these wires a digital supply?

  • errolf Feb 04, 2009

    Yes the motors are labeled as that but my meters do not measure significant voltages although motors work OK. Why have my tape decks stopped playing tapes in forward direction?

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7 Answers

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Its the problem of the reels which spins in the forward direction as some part is blocking it to move in forward direction.or the reels are slightly cracked.so its not functioning properly.

Posted on Feb 04, 2009

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  • Master
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You may have old rubber band belts that have lost there tension rate. this can cause slippage and prevent the motor from doing its job efficiently. if its a totally gear driven then, its you motor. it should be replaced.

Posted on Feb 04, 2009

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The voltages out from an Amp on an audio circuit are variable, that is what an amp does.
The voltages in from deck whires connected to the head is very low, you need to read it with a multimeter, the signal is not preamped and go straight to amp section, where it comes out with higher voltage.

If you send the unit for repair , better not to do any modification, and send the whole unit. You risk to damage the unit further.

Posted on Jan 29, 2009

  • Ginko
    Ginko Feb 04, 2009

    Re "Why have my tape decks stopped playing tapes in forward direction?"

    Decks use same motor for forward and rewind, if the deck does not work on forward, this has nothing to do with faulty motors or voltages, this is a mechanic problem as deck will switch motor action from forward to rewind using the deck mechanisms, prbably one of the springs or of the little tabs in deck meckanics had gone lost.


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If the wire are routed from the tape deck to the amplifier (as you stated) then the voltage on these wire will not be readable on a normal multimeter. You will need an o-scope.

These are the wires sending the signal from the magnetic tape head back to the amplifier for amplification.

As far as repair goes... I don't know that it would be worth the investment. You can get a really nice dual tape deck (similar to yours) for under $100 online. You will at least spend $45 plus parts at a repair shop.

Might just be time for an upgrade.

Posted on Jan 29, 2009

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Hi

Click on the following link its of great help :

http://service.us.panasonic.com/OPERMANPDF/SADX940.PDF

Posted on Jan 26, 2009

  • 1 more comment 
  • Rylee Smith
    Rylee Smith Jan 26, 2009

    Check out the above link for the service manual, it has all the technical specifications of your Technics system and also the parts specificationslike voltage ratings, current ratings, etc.



    The voltages of white and black wires (that are inside your technics near the capacitors) are of 27mV. And check for continuity in them when mains power is not connected.



    Please revert for any clarifications.



    Thanks

    Rylee

  • Rylee Smith
    Rylee Smith Jan 29, 2009

    Voltmeters should give you a reading whether it is a digital one or analogue voltmeter/multimeter, if not then that part is faulty. Replace that part and then your problem will be resolved.



    Thanks

    Rylee

  • Rylee Smith
    Rylee Smith Jan 29, 2009

    And, for faulty location and its part no. refer to the service manual i posted in my first post. Please revert for any clarifications.

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Use a multimeter, to see what the voltages are. White usually means + and black means negative. But for some reason, they might flip them around. A multimeter will help you with.

Posted on Jan 26, 2009

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  • Technics Master
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The power supply to the motor is 12 volts.

Posted on Jan 31, 2009

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