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Common voltages from PWR SUPPLY in VCRs ?

Discussion in 'Electronic Repair' started by Pszemol, Aug 18, 2005.

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  1. Pszemol

    Pszemol Guest

    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.
     
  2. Without experience you should`nt touch the powersupply, ESPECIALLY WHEN
    PLUGGED IN could be 120 volts AC(ALTERNATING CURRENT) coming out
    (DANGEROUS).
     
  3. No such thing as "common voltages". What's the make and model?

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

    --- 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
    contact me via the Feedback Form in the FAQs.
     
  4. Pszemol

    Pszemol Guest

    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 ;-)
     
  5. Pszemol

    Pszemol Guest

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

    --- 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
    contact me via the Feedback Form in the FAQs.
     
  7. Pszemol

    Pszemol Guest

    Sure... but this one in the Zenith is not a self respecting one ;-)
    The main capacitor is rated for 200V.
     
  8. Yep, no doubler. :) The >150 VDC or so on that cap can still be lethal though.

    --- 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
    contact me via the Feedback Form in the FAQs.
     
  9. Pszemol

    Pszemol Guest

    Do you know this Zenith VCR ? Any info on voltages at the power supply output ?
    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 ?
     
  10. 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
     
  11. Pszemol

    Pszemol Guest

    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.
     
  12. Pszemol

    Pszemol Guest

    Thanks, I have found an example schematic there:
    http://repairfaq.ece.drexel.edu/sam/vcrps.pdf
     
  13. 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
    contact me via the Feedback Form in the FAQs.
     
  14. Franc Zabkar

    Franc Zabkar Guest

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


    - Franc Zabkar
     
  15. 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/
    +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
    contact me via the Feedback Form in the FAQs.
     
  16. Guest

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