Re: Tech: WG6100 Help:(

Justin Monast wrote:
>
> Hey Guys,
>
> I have a quick question, on my defection board I'm getting the correct
> reading on the low voltage power supply +27.7 -27.7 but on the other end of
> diode 105 (which goes to P100 and others) reads +11.3 it should be -27.7.

Where did you actually check for the -27.7 volts? It seems the transistor Q101,
Q103 or ZD101 is defective.
Can you find out what the voltages are at the B, C and E of Q101 and 103?
If you get the right voltage (about -28.4V) at the E of Q101 (and thus the B of
Q103) Q101 should be ok. Then check Q103 to see it is actually receiving the
main 33V at it's Collector. If these two requirements are met then Q103 is
probably failing (because at the Emittor of this baby originates the main -27.5
V, which is +12 V according you. Then the 12V you are reading there is probably
the +27V minus a voltage drop from the 'positive half' of the XY amplifiers ect.
since they are not negatively fed anymore.

Normally a defective transistor/diode is short-circuiting, but in you case is
prbably gone high-ohmic or a bad connection.

  I
> also replaced, checked and capped every component from the high voltage to
> the chasse transistors. I know it's not the high voltage section because I
> swapped a know good one and still have the same problem. At this point I 'm
> stuck I've been working on this for two months and have looked at every
> place on the net that has dealt with vector monitors, but to not avail...
>
> p.s. Also since I'm not getting the corect -27, the high voltage does not
> come up and the spot killer light stays on...

You're roght, the HV cannot cause this I think...

 
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Received on Sat May 20 15:00:10 2000