On Thu, 29 Jul 2004, Chris Loggans wrote:
> got a K6100 that came to me with both of the chassis
> mounted low voltage transistors blown (one open, one
> shorted). I replaced the transistors, installed an
> LV2000 and did a quick check of all other transistors
> and everything appeared to be fine. I powered it up
> with no signal and it seemed to be running OK. I
> hooked up the boards, fired up the game and within a
> minute or so, the chassis mounted Y transistors (Q60x)
> were HOT and the low voltage transistors were out
> again. I replaced all of the transistors again, did a
OK. First thing first -- you know your input is good - the game board you
are hooking it to works on another monitor I assume ?
Before they blew again, was there a picture on the screen, spot killer lit,
etc ? Do you have HV (before those transistors blow) ?
You received this monitor broken -- do you think someone tried to fix it
before you got it ? I would go over the board very carefully for anything
that looks like previous work that might be botched. Example -- someone
tried to do a cap kit and put parts in the wrong place -- replaced d901 with
zd901, etc.
What happens if you power-up the deflection board without the HV
cage connected ?
> that was causing me concern is the voltage coming out
> of the U57 (Q603 I think, I don't have my schematics
> handy) going into the base of the 3716. According to
> the schematics, this should be 0.3v with no signal.
> I'm getting 0.004 (essentially nothing). Both of the
> input voltages to Q603 are correct and the U57 has
If it wasn't for the no-voltage here, I would almost think there might be a
problem in the HV cage that was drawing the extra current.
Oh -- before blowing more transistors, check the fuses to make sure they
weren't replaced with something bigger, since "They kept blowing." :-)
==========================================================
Chris Candreva -- chris@westnet.com -- (914) 967-7816
WestNet Internet Services of Westchester
http://www.westnet.com/
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Received on Thu Jul 29 11:42:08 2004
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