Question about RCA DRC8335

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VCR portion not working found Damaged Components

I had the same problem with my DRC8335. The 470uF 16 V capacitor in C226 was blown. I changed it and the unit worked for about 2 hours and then began to continually restart itself. I found that the 220 uF 16 V capacitors in C209 and C210 where also damaged and the C226 Cap was bad again. I changed out all the Electrolytic Caps in the power supply and the DVD recorder works great. The question that I have is this, the VCR part does not work I found a Heat Damaged resistor and diode on the upper right side of the VCR PC board (by the power supply board). The location of the components are “RU83” and “DU83”. I was wondering if you happen to know the values for these two components so that I may changed them out? Thanks for you help in advance.

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  • toroden Dec 15, 2008

    I replaced the C226 capacitor and now the DVD works but the VCR still does not. Has anyone identified the other parts that need to be replaced for the VCR. Thanks.

  • Mike Adams
    Mike Adams May 11, 2010

    EERepair. In addition to the usual #C226 capacitor failure, I further identified two other PS caps running excessively hot, which I've replaced. Specifically caps #C216 and #C218 both of which are 1000µf. The former having a 16 volt rating and latter 10 volt, as installed at the factory. After upgrading both to a 35 working-voltage rating they're no longer even noticably warm.

    Beyond the faulty power-supply capacitors I further discovered zener diode #DU83 on the VCR PCB was red hot, just as in your case! For this reason, I've temporarily taken it out-of-circuit so it won't load-down the power-supply, until it's been replaced.

    At this moment, I'm not sure yet myself what DU83's voltage rating is. It's so tiny in size you couldn't possibly read any of its identification markings (assuming there are any) without the aid of a powerful magnifying glass! I checked all the Service Manual sites, but none have one for the DRC8335. So I'll proceed by using my DMM to measure the source DC voltage on it's pads and let you know, once I've determined what DU83's correct value should be.

    Unlike your situation, my VCR board's RU83 (51ohm 1/2 watt 5% tolerance) resistor didn't fry and appears to be in good shape. So I'm able to provide 1/2 of what you asked and needed to know. Hopefully I'll have DU83's value determined in another day or so, once I have more time to resolve the question.

    Questions:
    Have you discovered any further information regarding DU83 since your August 14th post?
    Other than DU83 and RU83, were there any other damaged components on the VCR PCB which had to be replaced?

    I'm hoping once I've determined DU83's value and solder-in a replacement, this much alone will completely restore the VCR deck functionality. But obviously there could be further components involved, as a consequence of DU83's thermal-runaway breakdown.

    I noticed one of the transistors immediately below DU83 felt suspiciously warm, if not bordering on hot. But it was literally laying on top of the overheating DU83. Once I repositioned the transistor away, it seemed to cool down quite considerably. Obviously I won't be able to make any further determinations until I've first replaced DU83.

    Please email me directly if so inclined and you have time. It'd be the quickest way to contact me. mikeadams110@yahoo.com

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Ya rca needs to recall all rca drc8335[tape decks]
I unpluged power to deck [jumper p/s to deck]
use a other vhs deck pluged in avi port

Posted on Aug 17, 2008

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