Baby Pac-man: Replacing lamp rectifiers

[fatsgt]

I have a couple lamps out on my playfield. THe lamps are good so I believe I need to replace some 2N5060 SCR's (Rectifiers).

I found info here:http://www.pinrepair.com/bally/babypac.htm that states to find the offending rectifier, "Note the color of the wire going to the problem lamp socket. Then find this wire color on the lamp/solenoid driver board connector. Then trace the connector its corresponding 2N5060 SCR. The lower leg of the SCR can be grounded, and the playfield light should turn on. If it does the wiring from the SCR to the playfield lamp is good, and the 2N5060 SCR should be replaced."

but I was wondering if there was a chart to map exactly which lamp is matched to which rectifier? I believe they are in pairs of two?

"The lower leg of the SCR can be grounded, and the playfield light should turn on." Who do you know which one is the lower leg? Does this mean I can run a ground wire jumper to test these?

Thanks

 

[drewscruis]

I just put it in lamp test and use a logic probe to backtrack from the socket to the driver board. Then I'll just use a continuity test from the header back to the offending component.

 

[fatsgt]

I just put it in lamp test and use a logic probe to backtrack from the socket to the driver board. Then I'll just use a continuity test from the header back to the offending component.

I'm pretty new to this and don't have a logic probe. Can you explain what you mean by "Continuity test"?

Thanks!

 

[fatsgt]

Think I found the list I was looking for!

http://stevekulpa.net/pinball/bpm_sl.htm

Just need figure out how to decifer it now.

 

[87 t-66]

I followed the wiring diagram in the manual to find which one went to each bulb. Might as well replace all of them while you are at it.

 

[gutz]

I found info here:http://www.pinrepair.com/bally/babypac.htm that states to find the offending rectifier, "Note the color of the wire going to the problem lamp socket. Then find this wire color on the lamp/solenoid driver board connector. Then trace the connector its corresponding 2N5060 SCR. The lower leg of the SCR can be grounded, and the playfield light should turn on. If it does the wiring from the SCR to the playfield lamp is good, and the 2N5060 SCR should be replaced."

If you don't have the manual, you need this technique.

Once you have the manual, its much easier to look it up.

 

[fatsgt]

Think I found the recitifiers I need to replace using the schematic in the manual.

I have the 2N5060 SCR's is there any polarity for these or anything else I need to know before I dive in?

 

[87 t-66]

each hole is labeled on the board, it's pretty straightforward.

 

[marxtoys]

The cheesy wiring connectors Bally used are a major source of problems in these games. Wiggle the wires and see if your lights flicker back to life.