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Topic: rockola 480 need help
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John McConnel
Expert Film Handler
Posts: 118
From: Okmulgee, OK USA
Registered: Nov 2003
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posted 01-16-2016 09:55 PM
There are several possible causes of the problem. First, check the fuses.
On the selector assembly of your model, there should be small copper contacts that rotate. Using contact cleaner on them may solve the problem. Treat these contacts gently.
Another problem could be that the motor with the knurled knob has failed. Select a record and then push the knurled knob in and out and tap on the motor housing, to try to get the motor to run, or at least try to start. If it does, then you know what needs to be repaired.
If that didn't work, use a meter to see if the motor is getting voltage. If so, disassemble the motor and check the wiring to the field coils and to the brushes. Check the field coils for continuity. Examine the commutator, and polish it if necessary. Check the brush springs to be sure they're in place. Brushes may be worn excessively and need replacement.
Other problems could be worn bearings or a failed armature. With patience, you'll get it repaired.
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