Re: 6101 Def Board Prob

NEVER NEVER NEVER run an XY monitor with the deflection transistors out of
circuit unless you really like letting the smoke out of numerous
components. IT is 'usually' safe to run a monitor with the YOKE unplugged
as that is the load and thus the transistors can't pass enough current to
hurt themselves, however at that point you want to have the game board
unplugged and the inputs to the monitor grounded and you should get 0.00VDC
at the yoke windings if the monitor is working correctly. If any positive
or negative voltage is present then that will give you a clue as to the
direction of the problem.

You could even feed in an small audio signal and watch the output on a
scope to see what is going on. After all these are just BIG audio amps we
are talking about that happen to run a bit faster than your regular amps...

This is NOT (at this time) recommended for the Cinematronix monitors, I
haven't experimented with a bench test layout for them yet. Don't get
enough to fix these days, and in some ways they were more reliable than the
El's and WG's.

John :-#)#

At 05:23 AM 9/19/00, chumblespuzz wrote:
>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 11:46:21 2000