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Hitachi v152F probe 1 trace is flatline no change in trace

Discussion in 'Electronic Repair' started by Don, May 29, 2013.

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  1. Don

    Don Guest

    Probe 1 doesnt respond to any input..., ch 2 seems ok.
    BNC connector was loose and wire to resistor broke loose
    +Wire from resistor to BNC connector was re soldered nut tightened
    to BNC, and was working fine. Repair still looks good but
    ch 1 trace just a flat line can only adjust location of flat line.
    afraid to adjust internal pots in fear that I am making things worse.
    Channel 2 is working good responds to testing and calibration
    and internal pot adjustments. more in depth repair? or More aggressive
    adjusting? any thoughts?

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  2. N_Cook

    N_Cook Guest


    Blown first transistor or corrossion in one of the attenuator switch
    actions, no pot twiddling will resolve it.
    Can you swap a screened lead somewhere inside ? like checking left and right
    amps of a stereo unit
     
  3. Guest

    OHMMETER

    Does it read a short ?
     
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