Question about Televison & Video
EERepair. In addition to the usual #C226 capacitor failure, I furtheridentified two other PS caps running excessively hot, which I'vereplaced. Specifically caps #C216 and #C218 both of which are 1000µf.The former having a 16 volt rating and latter 10 volt, as installed atthe factory. After upgrading both to a 35 working-voltage ratingthey're no longer even noticably warm.
Beyond the faultypower-supply capacitors I further discovered zener diode #DU83 on theVCR PCB was red hot, just as in your case! For this reason, I'vetemporarily taken it out-of-circuit so it won't load-down thepower-supply, until it's been replaced.
At this moment, I'm notsure yet myself what DU83's voltage rating is. It's so tiny in size youcouldn't possibly read any of its identification markings (assumingthere are any) without the aid of a powerful magnifying glass! Ichecked all the Service Manual sites, but none have one for theDRC8335. So I'll proceed by using my DMM to measure the source DCvoltage on it's pads and let you know, once I've determined what DU83'scorrect value should be.
Unlike your situation, my VCR board'sRU83 (51ohm 1/2 watt 5% tolerance) resistor didn't fry and appears tobe in good shape. So I'm able to provide 1/2 of what you asked andneeded to know. Hopefully I'll have DU83's value determined in anotherday or so, once I have more time to resolve the question.
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'mhoping once I've determined DU83's value and solder-in a replacement,this much alone will completely restore the VCR deck functionality. Butobviously there could be further components involved, as a consequenceof DU83's thermal-runaway breakdown.
I noticed one of thetransistors immediately below DU83 felt suspiciously warm, if notbordering on hot. But it was literally laying on top of the overheatingDU83. Once I repositioned the transistor away, it seemed to cool downquite considerably. Obviously I won't be able to make any furtherdeterminations 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. firstname.lastname@example.org
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Posted on Jan 02, 2017
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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