Re: 6101 Def Board Prob

I did not replace those, but they tested fine (in circuit). Perhaps I should
pull them and test them.

-roy-

----- Original Message -----
From: "Bret Pehrson" <bret@infowest.com>
To: <vectorlist@synthcom.com>
Sent: Tuesday, September 19, 2000 11:07 PM
Subject: RE: VECTOR: 6101 Def Board Prob

> Have you tested/replaced Q703 & Q704? (Does the zanen kit include these
> transistors???). If not, I've had problems w/ fuse 700 on similar boards
> and the problem was one of these transistors.
>
> > -----Original Message-----
> > From: owner-vectorlist@synthcom.com
> > [mailto:owner-vectorlist@synthcom.com]On Behalf Of chumblespuzz
> > Sent: Tuesday, September 19, 2000 8:22 PM
> > To: vectorlist@synthcom.com
> > Subject: Re: VECTOR: 6101 Def Board Prob
> >
> >
> > Hi All,
> >
> > Ok. Tested with the output transistors unplugged and nothing blew. :)
Now
> > I've reconnected them and am quick to turn off the power before the fuse
> > blows.
> >
> > The problem seems to be in the low voltage circuit. Note - this was
fully
> > replaced (except for the caps) with the parts in the Zannen kit.
> >
> > The output from the bridge is a bit low: +30, -25. I've checked the
diodes
> > (out of circuit) and they all seem fine.
> >
> > The really weird thing is that where I should be getting +28 to
> > the base of
> > Q102, I'm getting -5!
> >
> > As I mentioned before, this board had ZD100 and ZD101 mis-labelled as
R104
> > and R105. I put the new Zeners in following the schematic and confirming
> > orientation with another board (properly labelled).
> >
> > Note, the transistors are ok - the monitor works perfectly with
> > another def
> > board.
> >
> > What did I screw up???"
> >
> > Thanks,
> > -roy-
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "chumblespuzz" <chumblespuzz@home.com>
> > To: <vectorlist@synthcom.com>
> > Sent: Tuesday, September 19, 2000 8:23 AM
> > Subject: VECTOR: 6101 Def Board Prob
> >
> >
> > > Hi All,
> > >
> > > * I sent this message last night and still didn't receive it back this
> > > morning, so this is a resend. Sorry if it is a duplicate for you. More
> > stuff
> > > added to this version anyway.*
> > >
> > > I'm working on a 6101. Zannen kit installed. Def board blows
> > F700. Before
> > it
> > > blows there is only very light HV chatter. Spot killer is not on.
Tested
> > in
> > > a known working monitor.
> > >
> > > I've looked in the FAQs, etc, but there is nothing referring to F700.
> > >
> > > How would you suggest I troubleshoot? Is it safe to test with the
> > deflection
> > > transistors disconnected? Would that prevent F700 from blowing
> > long enough
> > > for me to troubleshoot?
> > >
> > > Also, this board had ZD100 and ZD101 mis labelled as R104 and R105. Is
> > this
> > > an indication of an older version of the board?
> > >
> > > Thanks!
> > > -roy-
> > >
> > >
> > >
> > >
>
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Received on Tue Sep 19 23:49:16 2000