Re: System 6 six master display driver board
- From: "Ray Johnson - Action Pinball" <staff@xxxxxxxxxxxxxxxxx>
- Date: Mon, 5 Sep 2005 13:16:23 -0600
Most common problems like you're seeing are due to vibration and bad/dirty
connections between MPU board, display driver, driver and slave cables, and
slave cables and slaves. Also common in these old games is corrosion that
can develop between the pins on the display tubes- just as they go into the
glass. If you see dark stains between the pins, then you're seeing
corrosion. This sometimes allows signals/voltages to jump from pin to pin
and mess things up. Only real practical way to solve it is to replace the
display tube.
You've reflowed solder on backs of connector pins on top row on MPU- that's
good. Also check to make sure the wires in those connectors (female/cable
side) are snug in the IDC connectors- use small flat blate screwdriver to
press them in and ensure they're seated well.
Vibration problem while you're playing game affecting digits could be due to
bad connections between MPU and driver board- interruptions in the
address/data buss. Even after cleaning, cleaning, cleaning these, they can
still be bad or develop bad connections (again)- I've had a few games where
these were so stubborn that the only resolution was to replace them with all
new pins- both sides of the connection.
Make sure the card-edge connectors on the master display and all slaves are
clean- clean them with fine grade sandpaper to ensure they're good. Clean
the female card-edge connectors (wiring harness) with a cardboard emery
board/file to clean the pins in them.
If you continue to have problems, you may want to try narrowing down the
offending digits/segments to the appropriate chip(s) on the master board
that control them- look for commonalities- ie: one chip that may be to blame
for 2 problems or multiple problems on different displays- that will help
you figure out which chips may be bad and need replacing. Or if you're
working with the older transistor version of the board, schematics in your
manual should help you pinpoint possible bad transistor(s) in the same
manner.
Ray J.
--
Action Pinball & Amusement, LLC
Salt Lake City, Utah USA
Web: www.actionpinball.com
We're serious about pinball. Anything else is just for fun!
"Mark" <mkschultz@xxxxxxxxx> wrote in message
news:1125880928.731968.19170@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> *long*
>
> I have a strange issue with my displays on my Williams Time Warp. I
> have been through a lot with this machine, so here is where I am now:
>
> * I am able to power the game on and the games goes into attract mode
> * I can start a game and play an entire game (no lockups/resets)
> * All swicths, lamps, and solenoids work
> * Sound works
> * My score displays have strange and missing numbers
> * I had another working system 6 machine (which I have since sold) that
> I swapped driver boards with and the displays worked fine -- the only
> exception was the leftmost digit on player 1
> * In test mode (with the *bad* driver board) I started the display test
> (w/o the fuse for the 100 V displays) and let it run for a few hours.
> I returned and all the displays were correct
> * I turned the machine off, replaced the fuse, and when I turned the
> machine on My score displays are missing every other digit -- except #1
> which does not display anything and #3 which displays ___8_8
> *** Whenever the 5 bank drop targets are reset (solenoid fired) or the
> right eject hole is activated, the score displays flash the correct
> digits for a split second -- except for #1 which is blank
> * All voltages on the power board are correct
> * All test points on the CPU board checked OK (including the blanking
> signal
> * I replaced the 40 pin interconnect on both the CPU and Driver board
> * Pin 37 on the interconnect is receiving 5V (blanking)
> * I resoldered all of the male headers on the CPU and Driver board
> (removed old solder and replaced with new solder)
> * I checked ALL of the transitors on the driver board and I replaced 3
> transistors that were out of range on the driver board
> * I checked solenoid banks 3 and 6 on the driver board again also
> checking to make sure the 3 resistors were OK
> * I replaced the solenoid PIA chip on the driver board
> * I do not have a logic probe, but I have tested the 7180s using my DMM
> and they are testing OK
> * The brown wire on 4J7 (Display board) is receiving ~100V, the grey is
> receiving ~5V
>
> I know I have checked some other things but I cannot remember at the
> moment. Is there something I am overlooking?
>
> Thank you!
>
> -- Mark
>
.
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