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Old Yesterday, 01:43 PM   #21
Great Sage 齊天大聖
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Default Re: What kind of diode is this?

you probably need to clean the old crap out and re-lube them.
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Old Yesterday, 02:03 PM   #22
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Default Re: What kind of diode is this?

They are brushless DC motors and they use electronics to synthesize AC. The electronics will automatically generate the correct phasing so that there's no need for the capacitor to do so to generate the other phase (compare to 3-phase AC motors instead of 1-phase AC motors.)
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Old Yesterday, 02:33 PM   #23
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Default Re: What kind of diode is this?

Rule out mechanical problems before going into the electronics.
I would first clean out the old lube with q-tip and IPA. After 35 years, the original grease and oil is gummed up. The worm shaft for the head stepping motor needs grease, and guide shaft needs oil. The disk motor probably needs oil but should not be stiff as to not start spinning without help.

The disk motor circuit may be the same FC-9 as the later OA-32V pcb 1-609-924-11
I'm not sure what the "FG print coil, 60 pieces" is on CN1, as a tachometer circuit?
It's not like an AC motor with start cap. There's several 1uF,10uF ,100uF caps which could upset the tach. No datasheet on Sony CX-069A it might be a PLL for speed regulation.

For the diode D2 smoking, if the wiring is not shorting and the connector was not put on backwards, I would check the resistance of the stepper motor's four windings, and continuity to the motor case.
A fault to GND on CN5 pin 1 or 2 is what I would see overloads the diode.
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