1996 vf-oe -4025L power distribution board issues
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  1. #1
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    Default 1996 vf-oe -4025L power distribution board issues

    Hi,
    Very slowly getting to the bottom of a major problem with my VF-OE, mostly backwards steps but anyway...
    Long story short, issue with drive amps has burnt out a track on the central board, fixed that but am curious about what voltages I should be measuring on the rainbow coloured ribbon cable?

    Currently from blue to brown I have got 200v, nothing, 24v, nothing, earth and earth.

    Does that tally?

    If not, any ideas what they should be?
    Pretty sure I had measured the blue strand at only 19v previously, but have mislaid my notes.

    Thanks in advance,
    Tom.

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    If the wiring for the servo Power Monitor board is the same as the VF-1 '91, the brown is ground, red open (on the PM board, tied together on the servo board), orange/yellow is 18 VAC, and green/blue is 14 VAC.
    The two Power Monitor transformers are Paraline(?) 18/14VAC OEM or special.
    The only high voltage on the servo boards is the 160 VDC, P8.

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    Quote Originally Posted by magno_grail View Post
    If the wiring for the servo Power Monitor board is the same as the VF-1 '91, the brown is ground, red open (on the PM board, tied together on the servo board), orange/yellow is 18 VAC, and green/blue is 14 VAC.
    The two Power Monitor transformers are Paraline(?) 18/14VAC OEM or special.
    The only high voltage on the servo boards is the 160 VDC, P8.
    It's DC by the time it gets to 1995 by the looks of things, and the multimeter checks that out too.
    Te transformer down the bottom then traces to a pair of discreet bridge rectifiers and then on to the ribbon cable connectors.

    I've ordered a few and am hopeful that it's the cure but I fear the transformer has shorted to cause such a high output voltage.

    Been flat out recently but will update when I've had a minute to play.

    Anyone else got any ideas?


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