printer continually restarts

Archived from groups: comp.periphs.printers (More info?)

HP Laserjet 4500n

Event Log:

50 13.00.00

49 13.00.00

The manual don't list the error codes. Help anyone ?
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More about printer continually restarts
  1. Archived from groups: comp.periphs.printers (More info?)

    "Colliermeister" <> wrote:
    >HP Laserjet 4500n
    >Event Log:
    >50 13.00.00
    > 0023520
    >49 13.00.00
    > 023463
    >The manual don't list the error codes. Help anyone ?

    See below
    Indicates that a critical firmware error has occurred.
    An invalid command or data was sent to the
    formatter causing the processor to stop. This is the
    last action taken by the processor. The most likely
    cause of this error is invalid data or a bad command
    which was sent to the printer. A poor quality parallel
    cable, connection, or home grown application have
    been known to cause this error.
    1 Verify that all cables are connected.
    2 Turn the printer off and on to reset the printer.
    3 Cancel all print jobs then resend. Try to isolate
    any offending print job.
    4 If the formatter pan assembly or DC controller
    was removed, make sure the ribbon cable
    between the DC controller and the interconnect
    PCB is connected.
    Table 7-2 Numerical printer error messages (continued)
    EN Chapter 7 Troubleshooting 233
    The fusing assembly contains two heating bulbs,
    two thermo-switches, and two thermistors.
    AC power is provided to the fusing assembly via the
    DC power supply which is controlled by the
    DC controller PCB. The thermistors monitor the
    temperature of the fusing assembly and provide
    feedback to the DC controller PCB to regulate the
    fusing temperature. The two thermo-switches are
    wired in series with the fusing bulbs and “open” if
    the temperature exceeds 240° C.
    X Description:
    1 Low temperature error
    2 Fuser warm-up service
    3 High fuser temperature
    4 Faulty fuser
    5 Fuser voltage mismatch (verify that you have
    NOT installed a 110V fuser in a 220V printer or
    6 Fuser heater cutoff
    7 Fuser motor malfunction (see recommended
    action for 50.7 Fuser error).
    Note A visual check to determine if
    the fusing assembly is
    functional can be made by
    defeating the rear door interlock
    switch (see Figure 7-28) by
    pressing in on the white plastic
    above the left rear corner of the
    fan and then powering on the
    printer. If the fusing bulbs and
    thermo-switches are good, you
    should observe light from the
    lower fusing bulb as the printer
    warms up.
    1 Turn the printer off and on to reset the printer. If
    the error persists, try re-installing the fusing
    assembly. If the error continues to persist,
    proceed to step 2.
    2 Turn the power off and remove the fusing
    assembly. Measure the resistance between pin
    3 and pin 4. The resistance should be between
    6+/-2 ohms. If there is no continuity between
    pins, it may be assumed that either a heating
    bulb and/or a thermo-switch is “open”. Replace
    the fusing assembly. If resistance limits were
    acceptable, proceed to step 3.
    3 Referring to Figure 7-31, measure the
    resistance for both the upper and lower
    thermistors. The resistance should be between
    430K ohms and 310K ohms at room
    temperature (25° C). If the resistance exceeds
    limits, replace the fusing assembly. If resistance
    is within limits proceed to step 4.
    4 Verify the connectors at J1011 of the DC
    controller PCB and J1 of the Low voltage power
    supply assembly are firmly seated.
    5 Replace the power supply assembly.

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