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(Topic ID: 148366)

Stern Galaxy Not Booting

By Blake

8 years ago


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  • 149 posts
  • 10 Pinsiders participating
  • Latest reply 8 years ago by rcbrown316
  • Topic is favorited by 5 Pinsiders

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Linked Games

  • Galaxy Stern Electronics, 1980

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#2 8 years ago
 
ALP

anthony691

Inactive member

US Chicago, IL

8y 35,650 295 3 33

A lot looks strange about these TP readings. Were these metered with everything hooked up?

5v (pretty much all the MPU needs to boot) is notably absent on both SDB and MPU. Rectifier TP3, the line that feeds the regulator circuit, looks a bit hot. Many other values seem off. My gut is to suspect a fault on the rectifier board, 5v regulator circuit on SDB, and/or connectors.

Someone with more knowledge than I will hopefully chime in and help you narrow it down!

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#7 8 years ago
 
ALP

anthony691

Inactive member

US Chicago, IL

8y 35,650 295 3 33

OP
Quoted from Blake:

yeah that looks strange to me as well. and not having a manual is not helping.
thanks Blake

The manual is on IPDB, right?

Manuals don't describe expected values for test points and it looks like Stern located them slightly differently than Bally?

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#8 8 years ago
 
ALP

anthony691

Inactive member

US Chicago, IL

8y 35,650 295 3 33

OP
Quoted from Blake:

I also noticed the five volts everywhere was out. I will buy the kit and see what that does. in the meantime is there anything else I can try to isolate problems?
Thanks Blake

Test the diodes and bridges on the rectifier board with a DMM. Take a close look at connectors. Try to rule out a fault there before moving onto the SDB.

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#20 8 years ago
 
ALP

anthony691

Inactive member

US Chicago, IL

8y 35,650 295 3 33

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#24 8 years ago
 
ALP

anthony691

Inactive member

US Chicago, IL

8y 35,650 295 3 33

OP
Quoted from Blake:

I'm assuming tp2 is also connected to fuse 2 which later on in the night I saw had blown and I know I checked the SDU board before I checked the rectifier board so that's probably our answer there.

Solid thinking.

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#30 8 years ago
 
ALP

anthony691

Inactive member

US Chicago, IL

8y 35,650 295 3 33

I forgot to mention something very important: Galaxy is an awesome game!

Hope to add one to the collection one of these days.

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