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(Topic ID: 253668)

Tri Zone Special Solenoids


By troxel

1 year ago



Topic Stats

  • 11 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by Inkochnito
  • Topic is favorited by 1 Pinsider

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Williams_System-6-7_Driver-Board_layout.pdf (PDF preview)
Williams_System-6-7_Driver-Board_schematic.pdf (PDF preview)

#1 1 year ago

I am having a horrible time figuring out my special solenoids on this game. I got the game in an unknown state. Did the usually repairs (replace sockets, header pins, interconnect, etc). Thought it was working on the bench and moved it to the game and 3 solenoids lock on at startup. I have changed most chips in the circuit including all PIAs. Transistors are testing good. My signal from the PIAs are inconsistent and wondering if the problem is on the CPU board. I just replaced IC4 (8T97) and get the same problem

Any thoughts? I’m all ears!

#2 1 year ago

Try these test ROMs: http://pincoder.ca

While some of them can also be run on the bench they're designed to be run in-game. Try the 01a-leds first. Your locked on solenoids should stay off at power up. From there use the ROMs that follow and you'll be better suited to find the problem.

#3 1 year ago

Did you replace the inter board connectors (40 pins)?
IC4 is for the last set of regular solenoids (13 thru 16).

The special solenoids are in the upper left corner of the driver board.
IC's 6, 7, 8 & 9.
Pre-driver transistors Q1-Q3-Q5-Q7-Q9-Q11
Driver transistors Q2-Q4-Q6-Q8-Q10-Q12
Make sure the switches are open for the pop bumpers and slingshots.
The coils stay energized as long as the switch is closed.
Attached are files for Fire Power, but the schematics are the same.
The special solenoids are in the lower right part of the schematics.

Williams_System-6-7_Driver-Board_layout.pdfWilliams_System-6-7_Driver-Board_schematic.pdf
#4 1 year ago

I would also recommend using a Bridge Board....
http://www.inkochnito.nl (click on the bridge board image)

and a Special Solenoid Saver board....
https://nvram.weebly.com/repair--conversion-kits.html

While you are at it, add a nvram board (no more batteries needed)...
https://nvram.weebly.com/

#5 1 year ago
Quoted from Inkochnito:

Did you replace the inter board connectors (40 pins)?

Yes, I did.

Quoted from Inkochnito:

Make sure the switches are open for the pop bumpers and slingshots.
The coils stay energized as long as the switch is closed.

Switches are open, and I also replaced the resistor/cap on each switch.

Left Kicker (20), bottom BP (19), and left BP (18) are the three that lock-on when then game starts. The flippers don't flip when the buttons are pressed.

#6 1 year ago
Quoted from pincoder:

Try these test ROMs: http://pincoder.ca
While some of them can also be run on the bench they're designed to be run in-game. Try the 01a-leds first. Your locked on solenoids should stay off at power up. From there use the ROMs that follow and you'll be better suited to find the problem.

Thank you! I will burn a set and see what happens. Just started looking at the docs.

#7 1 year ago
Quoted from troxel:

Yes, I did.

Switches are open, and I also replaced the resistor/cap on each switch.
Left Kicker (20), bottom BP (19), and left BP (18) are the three that lock-on when then game starts. The flippers don't flip when the buttons are pressed.

These all have IC8 in common.
I'd start with replacing IC8.

#8 1 year ago

Thanks, inkochnito . I appreciate the help!

IC 8 has been replaced. That was my first thought. I have replaced IC6-IC9 along with the PIAs.

I have some signals that are floating and doesn't seem to make sense. The floating signals are coming off of different chips and not one chip. That is why I was thinking there might be a problem with the CPU.

#9 1 year ago

Are you sure the chip is inserted in the right way?
Is the soldering work at IC8 perfect?
The other possibility is IC9, because it has the Game Over line.

#10 1 year ago
Quoted from Inkochnito:

Are you sure the chip is inserted in the right way?

Yes, correct orientation, but wrong chip . I had a 7402 instead of the 7408. This fixed the coils locking on during startup, but still having problems. Bottom pop bumper locks on when I start a game.

Going through the PIAs. I get the following:
IC18 pin 19 - High
IC18 pin 39 - Floating

IC5 pin 19 - Low
IC5 pin 39 - Floating

IC10 pin 19 - Floating
IC10 pin 39 - High

IC11 pin 19 - High
IC11 pin 39 - Floating

My guess is to start with IC18 pin 39. This feeds into IC7 on the CPU board. I am thinking replacing that chip and see if the signal comes back. Any other ideas?

#11 1 year ago

IC6 is a 7408 chip
IC7 is a 7408 chip
IC8 is a 7402 chip
IC9 is a 7402 chip

First re-check Q5 and Q6.
After having a wroung chip in IC8 there might be a problem there.

Check input signal at IC6-pin 12 (should be high I think).
You can compare with pin 2, 4 or 10.
These should all be the same (playfield triggers)

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