Re: Gottlieb System 1 test switch question / Ni Wumpf CPU

Good troubleshooting, and an interesting fix! Out of curiosity, which pin (pin # or wire color) for the coin lock out do you currently have disconnected?

Jim
CARGPB35


terrencel@xxxxxxxxxxxxxx wrote:
On Jan 24, 8:57 am, terren...@xxxxxxxxxxxxxx wrote:

On Jan 24, 7:23 am, Steve Kulpa <steveku...@xxxxxxxxx> wrote:


It should not boot up in diagnostic mode. You have an issue w/ your
switch, it's wiring, or it's connection to the MPU.

steve
---
Steve Kulpa (cargpb10)
Hermitage, TNhttp://www.geocities.com/stevekulpa/pinball.htm-Pinballhttp://www.geocities.com/stevekulpa/faces/rgpidx.htm - Faces

On Jan 24, 12:02 am, terren...@xxxxxxxxxxxxxx wrote:

Hello Pinballers,- Hide quoted text -

- Show quoted text -

Hey Everyone,

Thanks for your input. I tested the continuity on theswitch, and it
works fine - no continuity when not pressed, continuity when pressed.
When the machine is on, the voltage on the CPU side of the diode is
always 4.24 VDC. I guess the diode is stuck open or there is a wiring
issue. I'll get back to it after work today.

Thanks for your input.

Terry


Hello Again,

Just in case anyone runs into the same problem I did, I solved it this
evening.

The only way I could get the game to turn on without going into
diagnostic mode was to disconnect the wires from the front door. What
really stumped me was when I desoldered one of the contacts to the
test switch and still got no response when I closed the circuit at the
other test switch terminal.

Next, I disconnect only the test switch pin from the harness
connector, and I STILL had the same problem - boot into diagnostic
mode.

So, I took apart the entire harness connector and added one pin at a
time. The culprit was the coin lockout feature. For some reason, that
coil was causing the test switch to appear closed all the time. I just
left the coin lockout pins disconnected, and everything works fine
now.

All I have left is to service all of the playfield solenoids and
switches. After that, I'll rebuild the broken Williams Flash I picked
up the other day.

By the way, how do I get my nickname, rather than my email, to show up
on the main message board?

Thanks to everyone who has helped me with this. I really appreciate
it.

Terry
.

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