Re: 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 22:42:18 2000