Re: Advice concerning Philips N4414 reel to reel machine
I've not had dried up grease affect the mechs on these machines myself.
When you move the pinch roller by pressing down on the counterweight, does it move freely? If so your fault is likely to be electrical. Check the plunger of the solenoid, does it move freely? If you manually move it, does it lift the pinch roller?
Look at the diagram attached, the red line shows the path of the current in play.
Whilst depressing play and keeping it in play, ensure the pause button is not in. The 'A' is from the power supply and should be around 20-24V it must be there otherwise the capstan motor wouldn't run and brake solenoid wouldn't operate.
Now with a meter check the contact SK604, there should be 20V or so on both contacts. If there is, then check the voltage on both contacts of the capstan solenoid. If there is 0V on both terminals, the check Diode D208, there should be roughly 20V on both sides. If there is, you have a broken wire or connection between the board and the solenoid. If there is 20V on both terminals of the solenoid then you have a ground problem.
If you have 20V on one terminal of the solenoid and 0V on the other, it means either the solenoid is open circuit or jammed. You can check if the solenoid is ok by doing a resistance check between the terminals, you should get a reading, though I cant tell you exactly what that might be, probably a couple of hundred ohms.
Please do your tests and report back.
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