Question about RCA VR646HF VHS VCR

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No color in young RCQ VR646HF recorder

I have an RCA VR646HF VHS recorder relatively unused and only a few years old. I can no longer get color out from this unit. I tried the usual... change tapes, change cables, clean heads, tune tracker, try tapes in out units... none of which restored the color. Otherwise the black and white output is great. Any guidance to a solution or detailed repair manual whereby I could do more testing etc on my own. thanks Paul Despault desp50@yahoo.ca Jan 2009

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  • desp50362 Jan 12, 2009

    Hi doogie 812,
    THank you for this interesting idea to do with drying out capacitors. I will try it shortly and report on results. Interestingly enough, I had not used the VCR in about a year. It worked fine before, but not now. This suggests to me that the problem is not due to wear. Your idea of aging of components makes sense. I am not an electrical technician but am a long background in mechanical engineering and should be able to grasp any good ideas to try.
    Thanks,
    Paul,, desp50362


  • Doug Linday May 11, 2010

    Question; Does it pass EE color (does the electronics pass color from video in to video out)? Color problems with VCRs can be very complicated to troubleshoot. Color recording on most video tape is what is called color under. The color carrier frequency for NTSC is 3.58MHz it is super heterodyned down to around 767 KHz. That being there is a lot that can go wrong leaving you with no color. My favorite diagnosis for any problem is coupling capacitors. Capacitors dry out over time. Sometimes you can get lucky and the dielectric will regenerate its self. Just leave the unit on for a few days. No tape, then just record anything for a few hours. Play back the end of the tape and see if the color returns.

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