Re: No picture on k4900 - dumb VOM question

So next steps and results are:

- Examine the jumper wire J33 as well as other jumper wires on the 130VDC
trace. (Done and look visually intact and ok)

- Inspect chassis for bad solders and or hairline cracks in pcb, (done and
looks ok, have not resoldered anything yet. )

Measure voltage at the metal case of Q352, the transistor on the side of the
chassis closest to the HV unit.

Question: I am a bit confused by the statement, "Measure the voltage at the
metal case." Does this mean that my red lead will go on the metal housing
on the outside of the chassis with the COM lead to the chassis frame?

Is it that white compound that unsulates the frame from the metal case?

In the pic below you can see the transistor, Q352 in the yellow box to the
right.

pic is here:
http://forum.arcadecontrols.com/index.php/topic,33450.msg290847.html#msg290847

----- Original Message -----
From: "James McGovern" <James@RetroBlast.com>
To: <rasterlist@vectorlist.org>
Sent: Monday, March 14, 2005 1:45 PM
Subject: RASTER: No picture on k4900 - dumb VOM question

> I had a little time to look through the k4900 manual and flowchart. One
of
> the first items to test according to the flowchart is:
>
> "Check the regulated power supply at resistor r503...terminal closest to
the
> fuse should read +130vdc"
>
> So my question is, I am assuming that I place the red test lead on my VOM
on
> the r503 terminal closest to the fuse as directed...where though do I
place
> the common lead?
>
> You can see the flowchart and the manual here (
> http://home.earthlink.net/~rescuetron/ ) in today's post or in the
> "Pictures and Documents" section in the sidebar.
>
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Received on Wed Mar 16 20:50:01 2005