Common voltages from PWR SUPPLY in VCRs ?
 

What are the common voltage outputs from the power supply ?
I am repairing my first VCR with power supply issue and
cannot figure out what should I expect in good working one.

I see 21V and -7V and many other pins with 0V.

Without experience you should`nt touch the powersupply, ESPECIALLY WHEN
PLUGGED IN could be 120 volts AC(ALTERNATING CURRENT) coming out
(DANGEROUS).
"Pszemol" wrote in message
...
What are the common voltage outputs from the power supply ?
I am repairing my first VCR with power supply issue and
cannot figure out what should I expect in good working one.

I see 21V and -7V and many other pins with 0V.

"Pszemol" writes:

What are the common voltage outputs from the power supply ?
I am repairing my first VCR with power supply issue and
cannot figure out what should I expect in good working one.

I see 21V and -7V and many other pins with 0V.

No such thing as "common voltages". What's the make and model?

And, as someone else shouted, do take care around the power supply.

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"Ricky from trailerparkboys" rplpefkipe@kpo[fg,net wrote in message ...
Without experience you should`nt touch the powersupply, ESPECIALLY WHEN
PLUGGED IN could be 120 volts AC(ALTERNATING CURRENT) coming out
(DANGEROUS).

Relax tiger... I know what the high voltages are, I worked with TV sets already.
There you have much more things to worry about than some stinking 120V ;-)

"Sam Goldwasser" wrote in message ...
"Pszemol" writes:

What are the common voltage outputs from the power supply ?
I am repairing my first VCR with power supply issue and
cannot figure out what should I expect in good working one.

I see 21V and -7V and many other pins with 0V.

No such thing as "common voltages". What's the make and model?

Sure, it is Zenth VRM4150.
Any schematic available for this one or similar model ?
Or any other VCR for that reason to just get an idea what to look for ?

And, as someone else shouted, do take care around the power supply.

You guys are right, and I am carefull. I have experience with voltages.
Do not worry, but thanks for worrying anyway - it was nice of you :-)

"Pszemol" writes:

"Ricky from trailerparkboys" rplpefkipe@kpo[fg,net wrote in message ...
Without experience you should`nt touch the powersupply, ESPECIALLY WHEN
PLUGGED IN could be 120 volts AC(ALTERNATING CURRENT) coming out
(DANGEROUS).

Relax tiger... I know what the high voltages are, I worked with TV sets already.
There you have much more things to worry about than some stinking 120V ;-)

Of course keep in mind that a self respecting switcher will have 300 VDC
in it somewhere. :)

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"Sam Goldwasser" wrote in message ...
Of course keep in mind that a self respecting switcher will have 300 VDC
in it somewhere. :)

Sure... but this one in the Zenith is not a self respecting one ;-)
The main capacitor is rated for 200V.

"Pszemol" writes:

"Sam Goldwasser" wrote in message ...
Of course keep in mind that a self respecting switcher will have 300 VDC
in it somewhere. :)

Sure... but this one in the Zenith is not a self respecting one ;-)
The main capacitor is rated for 200V.

Yep, no doubler. :) The 150 VDC or so on that cap can still be lethal though.

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"Sam Goldwasser" wrote in message ...
Yep, no doubler. :) The 150 VDC or so on that cap can still be lethal though.

Do you know this Zenith VCR ? Any info on voltages at the power supply output ?

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Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
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I tried to search for VCR and power supply and could not find anything in FAQ.
What is the correct keyword set to get any info about this subject ?

"Pszemol" ) writes:
"Sam Goldwasser" wrote in message ...
Yep, no doubler. :) The 150 VDC or so on that cap can still be lethal though.

Do you know this Zenith VCR ? Any info on voltages at the power supply output ?

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
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I tried to search for VCR and power supply and could not find anything in FAQ.
What is the correct keyword set to get any info about this subject ?

You go to the repairfaq page, and look through the table of contents.
There is one about VCR's and there is one about switching supplies, I think
using the complete term "switch mode".

Michael

On Thu, 18 Aug 2005 15:04:34 -0500, "Pszemol" put
finger to keyboard and composed:

What are the common voltage outputs from the power supply ?
I am repairing my first VCR with power supply issue and
cannot figure out what should I expect in good working one.

I see 21V and -7V and many other pins with 0V.

At the very least you must have +5V for the standby logic. You should
find it on the front PCB and/or on one of the three (?) pins of the
remote sensor.


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

"Franc Zabkar" wrote in message ...
On Thu, 18 Aug 2005 15:04:34 -0500, "Pszemol" put
finger to keyboard and composed:

What are the common voltage outputs from the power supply ?
I am repairing my first VCR with power supply issue and
cannot figure out what should I expect in good working one.

I see 21V and -7V and many other pins with 0V.

At the very least you must have +5V for the standby logic. You should
find it on the front PCB and/or on one of the three (?) pins of the
remote sensor.

Very good point! And even this one is not existing...
So it looks like the pwr supply itself is the problem, not the short on mb pcb.

"Michael Black" wrote in message ...
I tried to search for VCR and power supply and could not find anything in FAQ.
What is the correct keyword set to get any info about this subject ?

You go to the repairfaq page, and look through the table of contents.
There is one about VCR's and there is one about switching supplies,
I think using the complete term "switch mode".

Thanks, I have found an example schematic the
http://repairfaq.ece.drexel.edu/sam/vcrps.pdf

Franc Zabkar writes:

On Thu, 18 Aug 2005 15:04:34 -0500, "Pszemol" put
finger to keyboard and composed:

What are the common voltage outputs from the power supply ?
I am repairing my first VCR with power supply issue and
cannot figure out what should I expect in good working one.

I see 21V and -7V and many other pins with 0V.

At the very least you must have +5V for the standby logic. You should
find it on the front PCB and/or on one of the three (?) pins of the
remote sensor.

There may not be a +5.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
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On 23 Aug 2005 17:42:45 -0400, Sam Goldwasser
put finger to keyboard and composed:

Franc Zabkar writes:

On Thu, 18 Aug 2005 15:04:34 -0500, "Pszemol" put
finger to keyboard and composed:

What are the common voltage outputs from the power supply ?
I am repairing my first VCR with power supply issue and
cannot figure out what should I expect in good working one.

I see 21V and -7V and many other pins with 0V.

At the very least you must have +5V for the standby logic. You should
find it on the front PCB and/or on one of the three (?) pins of the
remote sensor.

There may not be a +5.

That's all I ever remember seeing. What other voltages are commonly
used?


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

Franc Zabkar writes:

On 23 Aug 2005 17:42:45 -0400, Sam Goldwasser
put finger to keyboard and composed:

Franc Zabkar writes:

On Thu, 18 Aug 2005 15:04:34 -0500, "Pszemol" put
finger to keyboard and composed:

What are the common voltage outputs from the power supply ?
I am repairing my first VCR with power supply issue and
cannot figure out what should I expect in good working one.

I see 21V and -7V and many other pins with 0V.

At the very least you must have +5V for the standby logic. You should
find it on the front PCB and/or on one of the three (?) pins of the
remote sensor.

There may not be a +5.

That's all I ever remember seeing. What other voltages are commonly
used?

I don't know what's common but there really isn't any requirement for
specifically 5 VDC in a VCR. It's not TTL. I seem to recall that the
typical Panasonic power supplies had something slightly off like 5.1 or 5.2
But no reason it can't be 6 V something else.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
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| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
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contact me via the Feedback Form in the FAQs.

Franc Zabkar wrote:
There may not be a +5.
That's all I ever remember seeing. What other voltages are commonly
used?

There should be at least something between 5 and 8 volts or something
between 12 and 16 volts on most VCR's.

---
Met vriendelijke groet,

Maarten Bakker.