That's good then, it sounds like C7 really was faulty. Now whether anything else is faulty remains to be seen.
Do you have any small caps like the 100pf C7 ? Its value isn't super critical and I would think anything around 68pf to perhaps 470pf would work OK. We could see how it all works without even fitting C7 if you haven't got one.
For testing the whole circuit and to see whether it all works or not requires everything connecting back up again, T5, and the motor.
Do you have any small caps like the 100pf C7 ? Its value isn't super critical and I would think anything around 68pf to perhaps 470pf would work OK. We could see how it all works without even fitting C7 if you haven't got one.
For testing the whole circuit and to see whether it all works or not requires everything connecting back up again, T5, and the motor.
New C7 fitted. Now I have new sympthoms:
It could work perfectly and stable for a minute (there is 5V AC to the motor on 33 spped and it spins like it should be) but then suddenly something happens and the motor begin to wobble it could stop and going the wrong directon then stop and wobble back and forth and so on. On the pcb at this moment Bulb begins to blink and there is a voltage drop to the motor. It jumping 4-5V AC while it should be stable 5V. On the 16 speed everything is more bad. And there is some strange noise in the motor. On the 45 it's better but there is defenetly something on the PCB is faulty.
The DC voltage on C9 when everything is connected now is 22-30V and it's jumping!
It could work perfectly and stable for a minute (there is 5V AC to the motor on 33 spped and it spins like it should be) but then suddenly something happens and the motor begin to wobble it could stop and going the wrong directon then stop and wobble back and forth and so on. On the pcb at this moment Bulb begins to blink and there is a voltage drop to the motor. It jumping 4-5V AC while it should be stable 5V. On the 16 speed everything is more bad. And there is some strange noise in the motor. On the 45 it's better but there is defenetly something on the PCB is faulty.
The DC voltage on C9 when everything is connected now is 22-30V and it's jumping!
Is the new cap definitely 100pf ?
Has the board got any previous unknown history ? Is it possible the preset resistors R17 and R22 have been altered in the past ?
Its unusual to find a definite fault (C7) and yet still find the unit isn't OK after replacing it. Have C2 and C3 been replaced ?
Has the board got any previous unknown history ? Is it possible the preset resistors R17 and R22 have been altered in the past ?
Its unusual to find a definite fault (C7) and yet still find the unit isn't OK after replacing it. Have C2 and C3 been replaced ?
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