Question about Sony CCP1300 Monaural 1-to-3 16x Master Copy Unit Single Dual Cassette Deck

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Nakamichi CR-4 Only Recording on One Channel...need help!

Hi Experts,

I bought a used Nakamichi CR-4 from eBay and it turns out that it only records on the Left channel and not on the Right channel.

When I use the manual calibration function present on this deck, it calibrates the Level to 0db but only goes upto -20db when Bias is calibrated using TDK SA cassette even after turning the Bias knob clockwise to the max. I have also tried calibrating using an EX tape with the correct tape type and equilizer setting but still cannot calibrate the Bias to 0db.

I have aligned the playback head using test tapes but when I try to align the recording head height and azimuth using 400Hz and 15KHz test tones, it only outputs to the Left channel and I only get a very small voltage on the Right channel as compared with the left channel.

Also, when recording the 15KHz test tone the voltmeter displays 15KHz on the left channel but it barely registers 1KHz (and that is also fluctuating between 500Hz and 1KHz) on the right channel.

I did go ahead and aligned the recording head based only on the output readings of the Left channel in the hope that it may bring the Right channel somewhat back into alignment if it was very mis-aligned, but to no avail.

Any thoughts on what could be wrong with the deck, any suggestions on how to fix it? Any help will be geratly appreciated.

Thanks & best regards,
Nadeem

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  • Dnice1 May 10, 2008

    Hi Rob!



    I am kind of amazed that you think that it is really a stupid question just because you assumed that I did not clean the head.



    If you read my post, I did mention that I was trying to calibrate the deck and when tried to align the recording head I found that it was not recording on one channel. I know the procedure very well and always clean and de-magnetize the heads first before any recording or calibration.



    I also mentioned that I did go ahead and aligned the recording head using the output voltage only on the one working channel which I thought would bring the other non-working channel back to alignment (somewhat). So the head height and azimuth is roughly correct (for the working chanel at least).



    I do have the schematics for this deck and will try and chek if there is Bias present on the right channel of the recording head. Since I did record a very small voltage on the right channel while I was aligning the recording head, I think that there may be a little Bias current present.



    I will look into all of your suggestions, except the head cleaning one, and see if I could diagnose the fault.



    Thanks for your feedback.



    Best regards,

    Nadeem

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HELLO THERE!
I AM AN AUDIO CASSETTE DUPLICATOR TECH,AND LAST WEEK AFTER USING MY IN CASSETTE DUPLICATOR TASCAM 2640,I FIGURED THAT I LOST ALMOST 95% OF ONE CHANNEL AFTER CLEANING WITH THE TASCAM HEAD CLEANER IT REMAINS THE SAME,SO I DECIDED TO USE CLEAN ACETON,AND I WAS SURPRIZED THAT THE DEAD CHANNEL CAME BACK LIKE A HERO WITH NO PROBLEM.
AMAZING WHAT A BIT OF ACETON CAN DO.
SIMON.

Posted on Dec 10, 2008

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Hmmm.....heres a really stupid question but........is the head clean ? There may be a bit of oxide shorting the one side of the head out. Try cleaning the head with a q-tip and some 99% pure isopropyl alcohol. If you have done that ( you seem to be more knowledgeable than most ), I would suspect either the circuit that drives the right channel record head, or the head itself. Is the head running flat against the tape?. Is there a record/play relay or record relay somewhere in the circuit ?. I think at this point you really need a schematic. Do you have the AC oscillator signal ( bias ) present on the right record head ?. I would try this first, then look into a manual.......Good luck...Rob

Posted on May 09, 2008

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