Bad Denomination Call Attendant

[cliffeby]

I installed a new EEPROM and getting better results.  Still get a CALL ATTENDANT - BAD GAME EPROM on some startups but very infrequent in its game room location.  On restart, it always boots correctly.  Is this likely a cold solder joint or a bad cap/resistor on the backplane?  Always hard to diagnose intermittent issues.  Thanks to all for the help along the way.  Pics in next post.

[cliffeby]

Would like to find a candle and 50-cent hopper for it.

[Stayouttadabunker]

I wonder if "CALL ATTENDANT - BAD GAME EPROM" is just a dirty socket hole on one of the chips?
Spray some contact cleaner or deoxidizer into the chip socket might not be a bad idea.
Let dry, re-install chip and see if the message goes away?

[cliffeby]

The MPU came from Alan - Badbaud and he added a socket for the EEPROM on the motherboard/ backplane. Will try some more contact cleaner if it gets to be a routine occurrence.

[Stayouttadabunker]

Not that one...that's different...your error is the Game Eprom, not EEprom.

[cliffeby]

Alan had both boards. The mpu with the game EPROM was tested on his bench. Regardless, dirt can cause the intermittent issue. I will try the contact cleaner next.

[shortrackskater]

That's a lot of weight on that desk. I hope it's sturdy. And, are the machines bolted down to it?

[Chris-socal]

Bolted down?
Is he worried someone might grab a machine and run away with it? LOL

[shortrackskater]

Bolted down?
Is he worried someone might grab a machine and run away with it? LOL

 

I guess I should have clarified. All my machines are bolted to the stands in case of an earthquake.
And...
Years ago - a child of one of my friends pulled the handle, down and then kept pulling down with her weight on it.  I stopped her of course but realized that, if the table/desk/cabinet/base was unsteady, it could topple over. 

[cliffeby]

Thanks for the safety note.  The desk was my grandfather's (pre-IKEA) and could support at least 1000#s.  I'm not worried about earthquake in MD, but I never thought about the arm being used as a chin up bar.

Unrelated, still looking for help sourcing a 50-cent hopper.

[jay]

Speaking of ikea I don’t bolt mine down but I do use  straps to hold mine on the wall so they won’t tip.
IKEA provides these with their billy book cases but if you go to their returns/parts you can get them free for the asking. I have one in the corner and the ikea straps won’t reach so I used that “all round” metal strapping you can get at HomeDepot in the plumbing department. You do want to make sure it’s into a stud. I have pulled butterfly anchors through drywall with enough force.