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  1. #1
    Technician Walter Chavez's Avatar
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    AR337 error H4-01

    I have a AR337 with the H4-01 error, I got new fuser on the unit with the same result. What else can I check or do?, ASAP please.
    Thanks
    Walter


  2. #2
    Senior member of CRS 1,000+ Posts


    ZOOTECH's Avatar
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    If new fuser didn't take care of it, my best guess would be the AC power supply. The triacs for heater lamps are located there. Of course, the harness from AC ps to the fuser connector or the connector itself could have trouble....or, the PCU pwb isn't giving the signal to turn on HL2. Good Luck

    "You can't trust your eyes, if your mind is out of focus" --
    Sometimes, I feel like an island in a sea of incompetence. (.,.)
    "Work to live, don't live to work"

  3. #3
    Master Of The Obvious 5,000+ Posts


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    The real test is to clear the code, then while powering up meter on the AC 110VAC range:
    DC Power Supply CN203-2 to positive

    DC Power Supply CN201-1 to negative (HL1)
    then DCPower SupplyCN201-3 to negative (HL2)

    If you're getting no voltage then it's the power supply.
    If you're getting your voltages (~100v), but still no lamps lit it's the harnass or something in the lamp circuit.
    If you're getting your voltages, lamps light, but error out after ~30 seconds it could be the thermistors, the PCU, harnass to thermistors, or the thermistors may not be contacting the roller.

    =^..^=

    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.


    blackcat: Master Of The Obvious =^..^=

  4. #4
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    Check your wall voltage. Also if you replaced the whole fuser unit you are only left with PCU and power supply. If the lamps come on at all it is most likley the PCU because the power supply is functioning.


  5. #5
    Service Manager 100+ Posts deep's Avatar
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    Do not forget to reset the error code with sim14 after replacing the fuser.


  6. #6
    Technician Walter Chavez's Avatar
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    I change the Fuser and reset the error, had to do it twice to reset.
    Thanks you all


  7. #7
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    I have the same code on the same copier h4-01, had changed the upper fixing roller, both thermistors had been replaced 2 months ago, I think it might be the thermoswitch, the lamps do not come on, after resetting code.


  8. #8
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    blackcat4866's Avatar
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    See above:

    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.


    blackcat: Master Of The Obvious =^..^=

  9. #9
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    IC22

    Believe it or not...we tried all these things and failed (including replacement of the PCU board and flashrom). Noticed a tech tip on SharpNet regarding the IC22 EPROM chip on the ICU board.
    Replaced it (VHiAT28C64B-1 ?) and the problem never returned. I think it was also throwing some U-? codes alternately every time the H4-01 would appear.


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