RE: Cinematronics monitor help

There are some early Cinematronics schematics and docs floating
around that have this same error (unplug final transistors).
While we are on Cinematronics Monitors I remember reading a
Cinematronic doc that mentioned at one point there was a
shortage of LF1331's and that they had created a replacement
that was a small board that plugged into the LF1331 socket.
Has anyone ever found one or schematics for it?

-----Original Message-----
From: owner-vectorlist@synthcom.com
[mailto:owner-vectorlist@synthcom.com]On Behalf Of John Robertson
Sent: Monday, February 25, 2002 1:26 AM
To: vectorlist@synthcom.com; vectorlist@synthcom.com
Subject: Re: VECTOR: Cinematronics monitor help

Have you unplugged the audio board? That will cause the breakers to trip if
there is a problem with the final amplifier...then try the game again.

The information on Spies is WRONG (Al K. PLEASE fix that!), Cinematronics
had a sticker that was on the output transistor heat sinks that stated
something like "WARNING, do NOT run the monitor with the output transistors
unplugged. To do so will cause SERIOUS damage to the electronics" Or words
to that effect...perhaps it was "Leave us plugged in if you value your
game" but the general point is if you try running the monitor with the
output transistors unplugged you will blow the driver transistors and their
resistors and often the pre-drivers...and other stuff sometimes.

You CAN run the monitor with the yoke unplugged, this will remove the load
to the output transistors and you can use a scope to then monitor the
outputs at the yoke plug to see how things are behaving.

John :-#)#

At 10:59 PM 24/02/2002 -0500, Mark Jenison wrote:
>Hi all,
>
>I've got an early version Tailgunner monitor here. I was able to borrow a
>working Star Castle machine from someone and am using it as a test fixture
>for the Tailgunner monitor.
>
>Right now, the monitor stays up for about 10 seconds, with deflection
>chatter, no picture. Then the -25V breaker pops (then shortly after, the
>+25V breaker).
>
>Measuring voltages, all regulators are outputting the correct voltages
>(+/-18VDC, +/-15VDC). However, the +25VDC seems high (about 28 volts).
> The -25VDC is right on the money. However, when the -25 pops, the +25VDC
>line dips down to +25VDC.
>
>Unplugging the yoke and retrying, the breakers do not pop, and I get a nice
>white dot in the center of the screen.
>
>I've checked the tants, diodes and transistors; they all seem fine.
>
>BTW, the Cine monitor doc on spies says to unplug the harnesses to the heat
>sinks and leave the yoke plugged in to get "a smaller picture". I tried
>this once before I got this far and it burned up a bunch of resistors.
>Isn't this bad to do? Does this work for anyone? Maybe it just works on
>the separate-high-voltage version.
>
>--
>Mark Jenison
>
>
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Received on Mon Feb 25 15:30:46 2002