(Topic ID: 288674)

Stellar Wars - Troubleshoot Upper Lane Lights

By sworton

1 year ago



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  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by sworton
  • No one calls this topic a favorite

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#1 1 year ago

My #Stellar Wars Lane lights 1-4 are supposed to be off when the game starts and light up and as you pass the ball through each lane individually turn on. Instead, the lights are always on. Completing lanes 1-4 does advance the multiplier as it is supposed to do but the lights do not reset to off.

In addition, the "5X" multiplier light is also always on.

Does anyone have an idea how to troubleshoot this? I am a bit out of my depth on this one. PS - just had the original System 6 boards repaired for other issues.

Any thoughts are appreciated.

#2 1 year ago

Assuming all connectors are good, no shorts, etc, appears to be a problem in the Lamp Matrix. If comfortable troubleshooting at the board level, see page five of:

https://www.ipdb.org/files/2372/Williams_1979_Stellar_Wars_Schematics_February_1979_low_resolution_and_bleached_paginated.pdf

The attached lamp matrix can help.

SW-Lamps (resized).JPG
#3 1 year ago

Are they always on in attract mode and lamp test too?

#4 1 year ago

quick answer - lamps are always on - ive inspected all wires and connections associated with the matrix and do not visually see any shorts. I also made sure the transistors are not bent over on the driver board.

I do have the lamp matrix - column 3 is definitely the problem as the lights for all those specified come up. I just dont know how to isolate/test this.

#5 1 year ago

Comfortable reading a schematic? If so, the driver transistor for Column 3 (appears to be Q67, double check though) needs to be checked with the diode test of a multimeter. A defective transistor can cause the lights to remain on.

#6 1 year ago

Thanks - I see the transistor. Well the good news, is I found a few other links on Pinside. They suggested pulling the bulbs to see if any were shorted. So i pulled all the lane lights and out them back one at a time. I found the last light caused the short. Well not the light but the socket for the light had caught a splash of solder which shorted it.
I cleaned it up and now my lights are all working properly again.
I must say, Pinside has really great people who reach out and provide assistance along with really good info on how to fix things. It's a bit over mu head at times but I keep working at it.
Thank you all for your help.

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