Hi Chris.
I agree with Bruce in that a very good visual inspection for broken/disconnected wires or missing components is the best starting point. Then check the lamp in the indicator socket to make sure it works. The 12V LT is common to both sides of that supply and the lamp is part of that to let you know the LT is at least present. Also check all three fuses. They do not always blow in spectacular fashion. If in doubt with any of them they are easily tested for open circuit status with a multimeter. Replace any failed ones with correct rated new ones.
The Vibrator side is not fussy about the amount of amperage it gets with its 12 V LT and will generally respond to a reasonable amount of Amperage. If it does not respond at all there is a good possibility one of the electrolytic capacitors in the circuit is no longer functioning. These can be reformed back to good working order if you can identify them and carefully remove them. NOT with wire cutters but by desoldering them.
The Dynamotor needs Amperage to spin and if your 12 Volt source cannot deliver what is needed the Dynamotor will just sit there. If your amperage is sufficient to spin the Dynamotor, but it will not, its prolonged sitting may have produced enough surface oxides for the shaft to be sticking in dried out bearings. If you can access the Commutator with your fingers enough to turn it a bit by hand to break the oxides, then it might start spinning again when powered up, but it will need some TLC to keep it that way.
One caution as it has been a while since I have done this. IIRC, these suckers spin in only one direction which is often indicated on the ends of the Dynamotor with little curves arrows either painted , caste or stamped on the housing. Turn in that direction only.
David
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31-07-25, 00:31
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