If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
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 |
Ads |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Rockola 1984 model 490 issue | FrankP | Juke Boxes | 1 | April 26th 12 11:02 PM |
Rockola 440 Issue | robert | Juke Boxes | 0 | December 14th 11 02:37 AM |
Rockola Stepper Issue for 1454 | Rob in NYC[_2_] | Juke Boxes | 9 | April 30th 11 10:30 PM |
Rockola 440 issue (haven't yet purchased) | USSEnterprise | Juke Boxes | 0 | October 16th 06 08:02 PM |
Rockola Turntable Gripper Issue | Ken In Texas | Juke Boxes | 1 | April 29th 06 04:28 PM |