lol..no worries.. I guessed maybe I had the wrong part ##. I will
DEFINATLEY check that out!!
> Oops, I just realized you're not talking about the flyback, but
the
> smaller transformer on the HV board.
>
> Sorry, I don't know where to get a new one of those. However, I
do
> recommend you read the installation manual for the replacement
flyback
> which you can find at the first link below. It includes instructions
on
> how to add 3 fuses to the HV circuit to protect components
(including
> T901) in the event of another failure like the one you have.
>
> ___
> Ken
>
>
> Ken Sumrall wrote:
>
>> You can get one here:
>>
>> http://www.cinelabs.com/wg6100/
>>
>> which has link to here:
>>
>> http://arcadeshop.com/wgxy-fb/wgxy-fb.htm
>>
>> $79, and comes with extra protection components and a new
focus
>> assembly.
>>
>> Note, I've never ordered or used one of these flybacks, I
just remmeber
>> seeing it recently while searching for other parts to bring a
6100 back
>> to life.
>>
>> ___
>> Ken
>>
>>
>> akswanson@ntelos.net wrote:
>>
>>> I had suspected the triple nickel (555), and indeed it was
fried.
>>> It also took out Q905, AND T901.. I verified this by trying
T901 in a
>>> known good HV unit. I got smoke, and another blown Q905.. So
if
>>> anybody knows where I can get a replacement T901 thatd be
swell!
>>>
>>>
>>>
>>> > I'm not saying that you don't have a bad T901,
but can you verify
>>> that
>>> > IC901 (555 timer as a simple oscillator) is running. A
scope would
>>> show a
>>> > nice square wave coming out at pin 3. If it is stuck in
the high
>>> state,
>>> > it would keep Q904 and Q905 turned on constantly and
that would
>>> certainly
>>> > cause your problem. Of course in this state, there
would be no HV
>>> output
>>> > at all. Check ZD900 for 13V across it. ZD900 is the
voltage
>>> regulator
>>> > for the 555 chip. If the zener is partially shorted and
there isn't
>>> > enough voltage across the 555 chip, then the 555 chip
output might
>>> be
>>> > stuck even if there's nothing wrong with it. If the
zener is
>>> > open-circuit, the 555 chip will likely have blown.
>>> >
>>> > You should remove R917 and leave it out until you can
verify that
>>> IC901 is
>>> > running okay and that the transistors Q904/905 are both
switching.
>>> To
>>> > functionally test Q905, you can add a temporary 10k (to
47k)
>>> resistor
>>> > (1/2W to 1W) from +Vsupply (+28V) to Q905 collector. If
scope shows
>>> a
>>> > good square wave, remove the temporary resistor and
return your
>>> focus to
>>> > T901.
>>> > If you do not have a scope but you have a voltmeter,
connect your
>>> meter
>>> > (-) to ZD900 anode or IC901 pin 1. Use the meter(+) to
measure
>>> voltage at
>>> > ZD900 cathode and IC901 pin 8. Both should be about
13V. Measure
>>> IC901
>>> > pin 3. If it is running, it should be around 6.5V
plus/minus around
>>> 0.5V
>>> > roughly. The point here is that pin 3 should be
outputting a square
>>> wave
>>> > having roughly a 50% duty cycle so the voltmeter should
show
>>> approximately
>>> > one half the chip supply voltage.
>>> >
>>> >
>>> > William Boucher
>>> > http://www.biltronix.com
>>> > ----- Original Message -----
>>> >
>>>
From: akswanson@ntelos.net
>>> > To: vectorlist@vectorlist.org
>>> > Sent: Sunday, August 28, 2011 9:20 AM
>>> > Subject: VECTOR: K6100 T901
>>> >
>>> >
>>> > One of my 6100s had a fire on the HV board, took out
R917 and Q905.
>>> I
>>> > replaced those, and got smoke again.. Comparing the
resistance of
>>> the
>>> > primary of T901 to a known working T901 I get 9.5 Ohms
on the
>>> suspected
>>> > bad one and 17 ohms on the known good one. I get the
feeling I
>>> melted
>>> > the varnish on the wiring and shorted them together..
Does anyone
>>> know
>>> > where (or have) and extra T901? Also, Is there a
secondary cause,
>>> such
>>> > as a flyback failure that would cause this kind of
failure? I dont
>>> > want to blow the dang thing again..
>>> >
>>> >
>>> >
>>> > Andrew
>>> >
>>>
>>
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>>
>>
>
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Received on Sun Aug 28 22:28:28 2011
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