Hi! If anyone has a drawing for this set, I am in need of what the values are of C609 610 611&612 and also or R653 which was also blown, I hope this is all that is wrong with this set, I replaced the HOtr and both of the 4834 trs, also the VDRs. Thanks in advance for any help I get. Vince
Watch that resistor off the VDR is not open...if so Boom Boom.
I posted the following message on May 30, the same day that you first inquired...
You sound like a tech. Where are you located and what kind of work do you typically do?
Start the PS up slow and as soon as it starts switching note the frequency. If it is below about 50kHz be careful. I have seen these sets with surge damage with bad switching transformers and the tend to run slow from the start. If it does it will blow the PS again in short order. Also note the duty cycle of the transistors, which should be within a couple of percent of
50%. You should really get the training manual on this series of sets if you are going to work on them. Once you get to understand them they are pretty easy repairs.Check the standby circuit. If VDR601 was shorted, R644 is likely open and you need to check the rest of the standby circuit carefully before trying to start the PS. With external sources of damage I have seen these circuits, and the soft start and protect circuits damaged.
C609-C612 .22uFd 100V R653 1 ohm .25W
BTW, Tritronics has many Sony parts on their search engine and if they don't will do the research for you for free. Other Sony distributors such as Andrews and Fulton will do the same.
Leonard
R607 1-202-933-61 Q601/602 8-729-019-49 Q502 8-729-035-75 C611/612 1-136-169-00 D648 8-719-057-52 R622 1-212-958-00 VDR601 1-810-974-21
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