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Rockola 478 32V breaker issue



 
 
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Old January 11th 16, 08:51 PM posted to alt.collecting.juke-boxes
David Brown
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Default Rockola 478 32V breaker issue

I have a 478 Mystic that works fine most of the time but occasionally will blow the 32V breaker. Since it works most of the time I thought the breaker might be weak so I removed it and tested it and it always blows over 2A. I pulled both the magazine and gripper motors and rebuilt them. I was able to drop the current from about 300 mA per motor down to 180 mA. I monitored the current by looking at the drop across a 10R resistor and it looked very uniform so I don't believe I have any open or shorted windings in either motor.

If I select a dozen records, it might play them all or somewhere in that set it will blow the breaker. When I reset the breaker the gripper motor starts and all is well so the issue appears to be at the start of the gripper motor cycle.

I'm thinking it is NOT a motor issue but could be something else. Because it is so intermittent it will be hard to track down. I have the schematics for the 480 and assume the mechanism power supply board is the same.

In looking at the schematics I can see some possibilities:
Weak or bad MOV
Leaky drive transistors
Microswitch issues or alignment
Sticky relay
Something temperature related (breaker heats up)

Any thoughts, tips, or suggestions of what I might check or how to proceed?

Dave
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