ManRoland 305 - GraphoMetronic

Discussion in 'Man Roland Printing Presses' started by Paul Ricci, Nov 7, 2023.

  1. Paul Ricci

    Paul Ricci Member

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    Does anyone know what this error means and how to fix it? "white calibration field; incorrect density value 0705237" (see pic attached). This code affects our sheet scanner to not start a scan, so we have to shut down press for 2 minutes and reboot for it to work again.
    Any insight would be appreciated
    Thx
    Paul
     

    Attached Files:

  2. CHOCK

    CHOCK Senior Member

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    Hi sir:

    Please Reset the Master CPU, see that his 1) Vcc regulated power supply is in tolerance for 0.&% up or down.
    2) Clock measure in MHZ for CPU.

    3) Locate the pin RESET and Ground according with the CPU models, data sheet in Google, Yahoo, bing,etc

    4) However measure the battery in CPU for circuit Mosfet..!! and replace if necessary if too low, according with the printed voltage in battery....!!

     
  3. Mark Halasz

    Mark Halasz New Member

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    Chock I have a question regarding a Polar 76 EM…on powering up the unit turns on, the fence moves forward and then returns to the rear and the display shows “0”. Can you please offer some guidance Sir? Blessings
     
    Last edited: Nov 8, 2023
  4. CHOCK

    CHOCK Senior Member

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    Hi sir:
    First Step: Test all Regulated power Supply of machine in tolerance 0.7% up or down!!.

    Blessings.
     
  5. Paul Ricci

    Paul Ricci Member

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    Thank you very much Chock!...Since veteran press operators who can troubleshoot and fix issues are far & few between these days, now I just need to find a MR technician who knows how to do all this stuff...lol.
     
  6. drukman

    drukman Senior Member

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    It looks like a loss of position. Possible causes are dirt on the guide bearings or a damaged belt.
    PP You can reset directly. There is a computer reset button under the center console keyboard.
    It is not bad to write which model the densitometer is or at least the year the press was manufactured.
     
  7. Paul Ricci

    Paul Ricci Member

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    Thank you! We'll try this...
     
  8. Paul Ricci

    Paul Ricci Member

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    GraphoMetronic - FMD15
    Press manufactured - 1995
     
  9. CHOCK

    CHOCK Senior Member

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    OK.

    Blessings.
     

  10. Paul Ricci

    Paul Ricci Member

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    Found the reset switch on the FDM 15 unit under the keyboard, thx guys! But the more we think about it, as it always seems to be intermittent, working after a reboot, then days later not until we reboot, then fine again for a few days...we think it may be giving us a false error code and could just use a really good electronic cleaning!
     
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