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Carver receiver hr-895 one channel noise

Discussion in 'Electronic Repair' started by powerdoc, Jan 30, 2009.

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  1. powerdoc

    powerdoc Guest

    Bought it cheap because of this noise. Right channel only. When
    cold, noise is infrequent and as it warms up gets to be an
    intermittent scratching with occasional louder pops. Anyone with any
    experience on this unit or someone who can offer an idea as to the
    culprit? It is beyond the balance control as the noise is unaffected
    by it's use. What's the most likely component to be doing this? Any
    suggestions appreciated. Thanks!
     
  2. N_Cook

    N_Cook Guest


    electrolytic
     

  3. Possibly. I'm leaning more towards bad solder connections or a bad
    differential transistor pair.

    Mark Z.
     
  4. Jerry G.

    Jerry G. Guest

    I have had bad electrolytic capacitors and sometimes semiconductor
    type devices cause noise. With a scope you can trace through the audio
    signal path and determine where the noise is being generated.
    Sometimes finding intermittant noise problems can be tricky. An
    experienced tech should be able to fix this for you.

    Jerry G.

    __
     
  5. Tim Schwartz

    Tim Schwartz Guest


    Hello,

    Below is a reply I sent to someone else a few weeks ago. While the
    first paragraph does not apply to your complaint, the second one does.
    These units should have at least 4 inches of open air above them, as
    they tend to run hot.

    Regards,
    Tim Schwartz
    Bristol Electronics



    This unit was a 'customized' (for Carver) version of Marantz SR-92
    receiver. Carver issued a bulletin suggesting changing R902 in the
    power supply to a 47 ohm 2W flame proof resistor, and at the same time
    change the 'hologram relay' to their part number LY20240400, what ever
    that is. I would at least find R902 and make sure that it is not open.

    These amps also run very hot and sometimes the small driver transistors
    in the front amps need to be resoldered and/or replaced. As I recall,
    look at Q701 and 703 in the left channel, and Q702 and 704 in the right.
    Q701 and 702 are 2SA1145, and Q703 and 704 are 2SC2705. If the area of
    the PC board looks cooked, you might want to replace them. I'd check
    them with an ohm meter first to see if they are still functional. The
    transistors can be ordered from many suppliers, among them (in the US)
    MCM Electronics (www.mcmelectronics.com) . You should check over the
    soldering of that area of the PC board while you are there.
     
  6. 1
    0
    Feb 2, 2011
    Hi,

    as per the instructions did solder the Q703-Q704, but after doing so there is no sound from the speakers, not even a small crackle the out put section is totally out.
    What could be the possible reason? have i blown those transistors on my Carver HR 895.

    Please help
     
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