RE: Cinematronics monitor help

I have that little board floating around the shop. Haven't seen it for a
year or two, but I never throw anything away that looks useful...

I believe there is a schematic for it in Rock-Ola's docs for their Armour
Attack.

John :-#)#

At 06:27 PM 25/02/2002 -0500, Rich Marquette wrote:
>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 16:27:33 2002