05.07.2021, 14:50
(Dieser Beitrag wurde zuletzt bearbeitet: 05.07.2021, 14:54 von vf_marshall.)
Hi, I was hoping someone might be able to offer advice regarding a problem with a Philips N4520/00
The problem is the machine will not stay in any mode, play, fast forward, rewind. The solenoids activate and tape travel begins, then the solenoids drop and the depressed mode switch releases.
The counter is counting both up and down.
I am finding that the solenoid initial voltage of around 36v is correct, but this should reduce within a few seconds to around 18v but this doesn't happen. The 36v drops at the solenoid and the machine stops. I believe the circuit on panel 4C is at fault. I can make the machine run for longer by substituting capacitor C210 for a 10uf but the machine will still stop after around 10 seconds, once the transistor TS211 turns off.
I am finding that the 18v at the purple wire to each solenoid increases to around 36v then reduces to 0v momentarily, then returns to 18v once the solenoids have dropped.
Any help will be very gratefully received.
Thanks, Vic
The problem is the machine will not stay in any mode, play, fast forward, rewind. The solenoids activate and tape travel begins, then the solenoids drop and the depressed mode switch releases.
The counter is counting both up and down.
I am finding that the solenoid initial voltage of around 36v is correct, but this should reduce within a few seconds to around 18v but this doesn't happen. The 36v drops at the solenoid and the machine stops. I believe the circuit on panel 4C is at fault. I can make the machine run for longer by substituting capacitor C210 for a 10uf but the machine will still stop after around 10 seconds, once the transistor TS211 turns off.
I am finding that the 18v at the purple wire to each solenoid increases to around 36v then reduces to 0v momentarily, then returns to 18v once the solenoids have dropped.
Any help will be very gratefully received.
Thanks, Vic
