RCA VCR - VR676HF powering off problem

B

Bubba Jones

Guest
I have an RCA VR676HF VCR which is not working properly. It is about
10 years old.

Several months ago, when AC power failed and was restored, the unit
did not power up and appeared dead. I did the obvious - pull cover &
check AC line fuse. It was found okay. Power supply is SMPS.

After about 20 minutes, the unit came back on in standby mode (display
on and power indicates okay. I powered up into ON mode without any
problems.

The VCR continued to exhibit the same problem on all subsequent loss
of AC - need to wait about 25 minutes before unit "wakes up" and power
indication is present. I could live with this minor inconvenience.

Now, when the unit rewinds a tape or fast forwards and reaches near
end of tape, it powers off and appears dead. Unplugging it and
plugging it back in allows it to once again power up in about 25 mins.

If the AC cord is not removed and power cycled, the unit does not
"wake up" again.

Any ideas what may be causing this??

Thanks in advance for any help.

Bubba
 
"Bubba Jones" <Smelly@hotmail.com> wrote in message
news:9t5o70pnvog76rlare8g6nud671gpurh1j@4ax.com...
I have an RCA VR676HF VCR which is not working properly. It is about
10 years old.

Several months ago, when AC power failed and was restored, the unit
did not power up and appeared dead. I did the obvious - pull cover &
check AC line fuse. It was found okay. Power supply is SMPS.

After about 20 minutes, the unit came back on in standby mode (display
on and power indicates okay. I powered up into ON mode without any
problems.

The VCR continued to exhibit the same problem on all subsequent loss
of AC - need to wait about 25 minutes before unit "wakes up" and power
indication is present. I could live with this minor inconvenience.

Now, when the unit rewinds a tape or fast forwards and reaches near
end of tape, it powers off and appears dead. Unplugging it and
plugging it back in allows it to once again power up in about 25 mins.

If the AC cord is not removed and power cycled, the unit does not
"wake up" again.

Any ideas what may be causing this??

Thanks in advance for any help.

Bubba


There's a bad electrolytic cap in the power supply. The easiest way to
Click to expand...
troubleshoot this is to take a hair-dryer & get the power supply hot enough
to start working. Then use some "circuit cool", to cool down the caps, one
at a time until it powers down. (Sometimes you have to spray a cap, unplug
the AC cord, plug it back in to see if it powers up.) You will need to pull
the chassis & circuit board as one unit to change the bad cap. (It's not
hard to do) You can also find the bad one with an ESR meter. (If you have
one)
 
Most likely bad caps in the power supply. They can mostly be found by
cooling and heating them, if they are thermo sensitive. This is common in
these machines.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Bubba Jones" <Smelly@hotmail.com> wrote in message
news:9t5o70pnvog76rlare8g6nud671gpurh1j@4ax.com...
I have an RCA VR676HF VCR which is not working properly. It is about
10 years old.

Several months ago, when AC power failed and was restored, the unit
did not power up and appeared dead. I did the obvious - pull cover &
check AC line fuse. It was found okay. Power supply is SMPS.

After about 20 minutes, the unit came back on in standby mode (display
on and power indicates okay. I powered up into ON mode without any
problems.

The VCR continued to exhibit the same problem on all subsequent loss
of AC - need to wait about 25 minutes before unit "wakes up" and power
indication is present. I could live with this minor inconvenience.

Now, when the unit rewinds a tape or fast forwards and reaches near
end of tape, it powers off and appears dead. Unplugging it and
plugging it back in allows it to once again power up in about 25 mins.

If the AC cord is not removed and power cycled, the unit does not
"wake up" again.

Any ideas what may be causing this??

Thanks in advance for any help.

Bubba
 
Change the small electrolytics in the primary of the SMPS

--
==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)
jstielau@snet.net
========================
"If you push something hard enough it will fall over."
Fudd's First Law of Opposition - Sir Sidney Fudd


"Bubba Jones" <Smelly@hotmail.com> wrote in message
news:9t5o70pnvog76rlare8g6nud671gpurh1j@4ax.com...
I have an RCA VR676HF VCR which is not working properly. It is about
10 years old.

Several months ago, when AC power failed and was restored, the unit
did not power up and appeared dead. I did the obvious - pull cover &
check AC line fuse. It was found okay. Power supply is SMPS.

After about 20 minutes, the unit came back on in standby mode (display
on and power indicates okay. I powered up into ON mode without any
problems.

The VCR continued to exhibit the same problem on all subsequent loss
of AC - need to wait about 25 minutes before unit "wakes up" and power
indication is present. I could live with this minor inconvenience.

Now, when the unit rewinds a tape or fast forwards and reaches near
end of tape, it powers off and appears dead. Unplugging it and
plugging it back in allows it to once again power up in about 25 mins.

If the AC cord is not removed and power cycled, the unit does not
"wake up" again.

Any ideas what may be causing this??

Thanks in advance for any help.

Bubba
Click to expand...
 
check the esr of c09 just off the smr transistor it is probally bad


"Bubba Jones" <Smelly@hotmail.com> wrote in message
news:9t5o70pnvog76rlare8g6nud671gpurh1j@4ax.com...
I have an RCA VR676HF VCR which is not working properly. It is about
10 years old.

Several months ago, when AC power failed and was restored, the unit
did not power up and appeared dead. I did the obvious - pull cover &
check AC line fuse. It was found okay. Power supply is SMPS.

After about 20 minutes, the unit came back on in standby mode (display
on and power indicates okay. I powered up into ON mode without any
problems.

The VCR continued to exhibit the same problem on all subsequent loss
of AC - need to wait about 25 minutes before unit "wakes up" and power
indication is present. I could live with this minor inconvenience.

Now, when the unit rewinds a tape or fast forwards and reaches near
end of tape, it powers off and appears dead. Unplugging it and
plugging it back in allows it to once again power up in about 25 mins.

If the AC cord is not removed and power cycled, the unit does not
"wake up" again.

Any ideas what may be causing this??

Thanks in advance for any help.

Bubba
Click to expand...
 
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