General Troubleshooting 4-69
Printer Is On and Can Print Pages, but the Control Panel Appears
Frozen and No Error Messages Are Displayed
Note
Opening and closing the front door of the printer causes a reset of the entire
Control Panel.
1. Electrostatic Discharge.
a. If the printer is currently powered on and frozen, open then close the front
door of the printer and see if the LCD responds.
b. If printer appears functional after operating the door, advise client that
failure may have been due to an ESD event. Thoroughly test printer for any
other problems.
c. Skip the rest of this section if printer now appears functional, otherwise
continue debugging.
d. With power cord connected, touch the metal electronics module to discharge
any static electricity. ESD damage to the printer may occur if static
electricity is discharged to printer electronics.
e. Turn off printer and wait 30 seconds for power supply capacitors to
discharge. Damage to circuits within the electronics module may occur if the
power supply capacitors are not allowed to fully discharge.
f. Unplug power cord and remove printer's covers. Use caution around motors,
pulleys and live AC connections when working with the printer covers off.
g. Examine printer for loose grounding connections, especially the ground
strap on the Y-axis motor. Eliminate the possibility of internally generated
ESD from affecting printer.
h. Plug in all cables removed during service. Trace through all service steps
performed to reattach any cables that were unplugged during debugging.
i. Attach printer covers.
j. Perform full test of printer.
2. Control Panel failure
a. Unplug the original Control Panel at connector ('C' / J220) and plug in a
known working Control Panel. This step checks for a keypad or LCD failure
in the Control Panel.
b. Plug in all cables removed during service. Trace through all service steps
performed to reattach any cables that were unplugged during debugging.
c. Attach printer covers.
d. Perform full test of printer.
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