Philips VR457/03 rectifier diode (for 9-15 VDC) dies after c

M

Marcel

Guest
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" <marcel.rijnders@nl.mci.com> wrote in message
news:d30e3117.0310090354.746a9fcc@posting.google.com...
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
Click to expand...
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" <marcel.rijnders@nl.mci.com> wrote in message
news:d30e3117.0310090354.746a9fcc@posting.google.com...
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
Click to expand...
 
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" <mzacharias@nospam.earthlink.net> wrote in message news:<39ohb.4710$dn6.4623@newsread4.news.pas.earthlink.net>...
Is your replacement diode of the high-speed type? Switching power supplies
need fast rectifiers.

Mark Z.


"Marcel" <marcel.rijnders@nl.mci.com> wrote in message
news:d30e3117.0310090354.746a9fcc@posting.google.com...
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
Click to expand...
 
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