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Help with Sony STR-DE345 AV Receiver

Discussion in 'Electronic Repair' started by Paul, Mar 8, 2007.

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  1. Paul

    Paul Guest

    The main thing I need help with is the value for R736. It is a small
    resistor in the power supply section. Burned open - no color bands left.

    Besides this resistor, I found the following bad parts:
    Output transistor Q754 shorted
    Emitter resistor R766 open on the Q754 side (marked 0.22 ohms)

    Q754 is marked MP1620. I haven't searched for this part yet, but am not
    familiar with that part number. Is it a house number?

    Is the schematic for this model posted anywhere? It is probably not worth
    buying a service manual, as this receiver can be bought for less than $50 on
    eBay, but if I can get it going for the price of a few parts, it would be a
    good learning experience for my son. If someone has the schematic, a scan
    of the affected sections would be greatly appreciated.

  2. Arfa Daily

    Arfa Daily Guest


    Check your mail. I have sent the relevant part of the schematics direct to

  3. Paul

    Paul Guest

    Hi Arfa,
    THANKS for taking the time to send me the schematic of the output
    That will be very helpful.

    I could not find R736 in that portion of the schematic.
    Can you (or anyone else) tell me the value of R736?
    It is physically located in the power supply section, next to the main
    filter cap's.
    R736 is burned open on my unit and I can not read the color bands.

    (BTW, all should ignore my request for info on the MP1620
    A quick search answered my questions. Part is on order.)

  4. Paul

    Paul Guest

    Got it... that is all I need for now.
    Thanks for the 2nd e-mail Arfa!

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