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HP DeslJet 500 AC Adapter

Discussion in 'Electronic Repair' started by John Keiser, Feb 11, 2004.

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  1. John Keiser

    John Keiser Guest

    Does anyone know the pinout voltages?

    Should be 20 VAC out but I have 2 units and they show different volatges
    between the 4 pins.

    [My DJ50 and DJ 520 both display all LEDs green and neither initializes.
    Swapping the AC adapters doesn't help.].

    Thanks.
     
  2. James Sweet

    James Sweet Guest


    If they're switching power supplies which I suspect they are, you have to
    test the output under load.
     
  3. The adapters themselves for some of these printers are just AC. There
    is a switchmode power supply inside the printer.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
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  4. John Keiser

    John Keiser Guest

    Not a swithcing PS... just an AC transformer AFAIK but with 4 pins.

    I kept 2 of these old DeskJets so I could "easily" cannabalize one and keep
    the other working. Although different models, they share the same board
    number for the internal switching PS.

    Both have failed with all the green LEDs "on" and don't initialize.

    The failure of both lightly used units at the same time is baffling. But
    since the AC adapters show differnet voltages, I was hoping to start there
    and verify correct output.

    Any clues appreciated.

    Thanks.
     
  5. How different are they? I wouldn't worry about the difference
    between 19 and 21 VAC or something like that. Just different
    production runs.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the feedback form on the S.E.R FAQ Web sites.
     
  6. John Keiser

    John Keiser Guest

    Pins 1-2 = 11v; 1-3 = 22v on both adapters.

    Pins 1-4 = 3.5 on one and 13.5 on the other.

    I suspect that pin 1-4 is not a proper connection but as it is a major
    varience, I was hoping for guidnace before I dig into the "sealed" units to
    look further.

    Thank you.
     
  7. May just be capacitive coupling into open wires. Put a 1K resistor or
    some modest load across the meter leads and see if there is still
    significant voltage.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the feedback form on the S.E.R FAQ Web sites.
     
  8. Jerry G.

    Jerry G. Guest

    I would think it is the power supply board or some other fault in the
    printers. The reduced AC voltage from your adaptor units goes to a bridge
    rectifier, some filter caps, and then to a switch mode power supply module
    in most of these printers. This may also be called an inverter module in
    this type of case. Some of these printers have a more simple approach such
    as only a bridge rectifier, filter caps, and a number of voltage regulators
    feeding the various parts of the printer as needed. Naturally in any case,
    there will be a fair number of components involved in the complete process
    no matter what type of supply you have. You would have to open the printer
    to really know.

    If these printers are out of warranty and the fault is not a simple fix, it
    will pay more to replace them than to service them.

    --

    Greetings,

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


    Does anyone know the pinout voltages?

    Should be 20 VAC out but I have 2 units and they show different volatges
    between the 4 pins.

    [My DJ50 and DJ 520 both display all LEDs green and neither initializes.
    Swapping the AC adapters doesn't help.].

    Thanks.
     
  9. ®inoceros

    ®inoceros Guest

    Have repaired a couple of them some years ago so thats why I don't
    know the right values anymore (excuses)

    On the main board are two electrolytic capcitors. Exchange them both.
    Also clean the cartridge connectors with a piece of cloth with
    alcohol.

    Seems a problem of all the HP 500 series.

    Rinus
     
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