I am trying to bring an RCA VR 618HF vcr back to life. When I plug it in,
it shows absolutely no sign of life.
The power supply fuse is not blown. There are no signs of smoke,
overvoltage, and no circuit foil or components are burned.
I tore it apart and removed the circuit board so I could access the bottom
side of the smps. Checked ESR on
all electrolytic caps, only one (C813) checked high. Replaced it, powered
it up, same symptoms. Ohmmetered
the switching transistor and it measures a short (out of circuit). It is a
BUL26XI. I can't find an exact match
in the NTE cross reference, but checking BUL26 crosses to an NTE 2333 - (has
anyone used the NTE 2333
to replace one of these?) I was reading through some of Sam Goldwasser's
vcr troubleshooting and smps troubleshooting info, and decided I had better
check some of the resistors in the
circuit. Did that and there are two (I believe fusible) resistors that are
open. Can anyone (who has a schematic)
tell me the values for R817 and R818? They measure completely open and they
have five bands on them so I am
not sure how to read the value (which end to you start at?)

Thanks for any help.

Mac


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the NTE2333 is a High voltage NPN
450V Staturated and 1Kv break down.
at 6A cont 15 surge.
i would say that maybe case style would
be the factor here.
P.S.
you may want to also check the
driver transistors for this
Switching Transitor.


Mac wrote:

I am trying to bring an RCA VR 618HF vcr back to life. When I plug it in,
it shows absolutely no sign of life.
The power supply fuse is not blown. There are no signs of smoke,
overvoltage, and no circuit foil or components are burned.
I tore it apart and removed the circuit board so I could access the bottom
side of the smps. Checked ESR on
all electrolytic caps, only one (C813) checked high. Replaced it, powered
it up, same symptoms. Ohmmetered
the switching transistor and it measures a short (out of circuit). It is a
BUL26XI. I can't find an exact match
in the NTE cross reference, but checking BUL26 crosses to an NTE 2333 - (has
anyone used the NTE 2333
to replace one of these?) I was reading through some of Sam Goldwasser's
vcr troubleshooting and smps troubleshooting info, and decided I had better
check some of the resistors in the
circuit. Did that and there are two (I believe fusible) resistors that are
open. Can anyone (who has a schematic)
tell me the values for R817 and R818? They measure completely open and they
have five bands on them so I am
not sure how to read the value (which end to you start at?)

Thanks for any help.

Mac


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.776 / Virus Database: 523 - Release Date: 10/12/2004

The common failure is the 22uf np (non-polarized)
50 volt capacitor in the power supply! Rono.

"Mac" wrote in message
...
I am trying to bring an RCA VR 618HF vcr back to life. When I plug it in,
it shows absolutely no sign of life.
The power supply fuse is not blown. There are no signs of smoke,
overvoltage, and no circuit foil or components are burned.
I tore it apart and removed the circuit board so I could access the bottom
side of the smps. Checked ESR on
all electrolytic caps, only one (C813) checked high. Replaced it, powered
it up, same symptoms. Ohmmetered
the switching transistor and it measures a short (out of circuit). It is
a
BUL26XI. I can't find an exact match
in the NTE cross reference, but checking BUL26 crosses to an NTE 2333 -
(has
anyone used the NTE 2333
to replace one of these?) I was reading through some of Sam Goldwasser's
vcr troubleshooting and smps troubleshooting info, and decided I had
better
check some of the resistors in the
circuit. Did that and there are two (I believe fusible) resistors that
are
open. Can anyone (who has a schematic)
tell me the values for R817 and R818? They measure completely open and
they
have five bands on them so I am
not sure how to read the value (which end to you start at?)

Thanks for any help.

Mac


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.776 / Virus Database: 523 - Release Date: 10/12/2004