Hi, anyone experience with Philips VCR VR457/03 problems where the
9/15VDC rectifier diode in the power unit(BYW98-200) dies after a
couple of hours (the usual semiconductor smell).
I don't have the schematics but it seems this rectifier only drives
the motor circuitry. I haven't been able to measure the current at the
point it dies, but during the first hour or so, current is around 1A.
Have checked/replaced the capacitors but no luck so far....

Thanks, Marcel

"Marcel" wrote in message
om...
Hi, anyone experience with Philips VCR VR457/03 problems where the
9/15VDC rectifier diode in the power unit(BYW98-200) dies after a
couple of hours (the usual semiconductor smell).
I don't have the schematics but it seems this rectifier only drives
the motor circuitry. I haven't been able to measure the current at the
point it dies, but during the first hour or so, current is around 1A.
Have checked/replaced the capacitors but no luck so far....

Thanks, Marcel

Have you tried checking the resistance of the motor, or disconnecting it
completely ?

Alternatives are that PSU smoothing caps may be faulty, or there may be a
faulty voltage regulator on the 9v or 5v lines.

"Marcel" wrote in message
om...
Hi, anyone experience with Philips VCR VR457/03 problems where the
9/15VDC rectifier diode in the power unit(BYW98-200) dies after a
couple of hours (the usual semiconductor smell).
I don't have the schematics but it seems this rectifier only drives
the motor circuitry. I haven't been able to measure the current at the
point it dies, but during the first hour or so, current is around 1A.
Have checked/replaced the capacitors but no luck so far....

Thanks, Marcel

Have you tried checking the resistance of the motor, or disconnecting it
completely ?

Alternatives are that PSU smoothing caps may be faulty, or there may be a
faulty voltage regulator on the 9v or 5v lines.

Is your replacement diode of the high-speed type? Switching power supplies
need fast rectifiers.

Mark Z.


"Marcel" wrote in message
om...
Hi, anyone experience with Philips VCR VR457/03 problems where the
9/15VDC rectifier diode in the power unit(BYW98-200) dies after a
couple of hours (the usual semiconductor smell).
I don't have the schematics but it seems this rectifier only drives
the motor circuitry. I haven't been able to measure the current at the
point it dies, but during the first hour or so, current is around 1A.
Have checked/replaced the capacitors but no luck so far....

Thanks, Marcel

Is your replacement diode of the high-speed type? Switching power supplies
need fast rectifiers.

Mark Z.


"Marcel" wrote in message
om...
Hi, anyone experience with Philips VCR VR457/03 problems where the
9/15VDC rectifier diode in the power unit(BYW98-200) dies after a
couple of hours (the usual semiconductor smell).
I don't have the schematics but it seems this rectifier only drives
the motor circuitry. I haven't been able to measure the current at the
point it dies, but during the first hour or so, current is around 1A.
Have checked/replaced the capacitors but no luck so far....

Thanks, Marcel

Mark thanks, you were right. I thought the shop sold me the right one
but close inspection revealed they didn't.....I'm eating my shoes
right now and should have checked........thanks again,

Marcel

"Mark D. Zacharias" wrote in message link.net...
Is your replacement diode of the high-speed type? Switching power supplies
need fast rectifiers.

Mark Z.


"Marcel" wrote in message
om...
Hi, anyone experience with Philips VCR VR457/03 problems where the
9/15VDC rectifier diode in the power unit(BYW98-200) dies after a
couple of hours (the usual semiconductor smell).
I don't have the schematics but it seems this rectifier only drives
the motor circuitry. I haven't been able to measure the current at the
point it dies, but during the first hour or so, current is around 1A.
Have checked/replaced the capacitors but no luck so far....

Thanks, Marcel