Instruction manual
3–30 Troubleshooting
Symptoms Not Indicated by Fault Messages
Troubleshooting Table
Symptom Instruction
No power, control panel LCD and LEDs
blank, card cage fan not running.
1. +5 volt distribution problem to the controller board. (See
Power Distribution Diagram, page A–3.)
Power on hang condition.
1. Replace one at a time until the problem is fixed:
a) CMX controller board (page 5–10)
b) power supply (page 5–12)
Blank or single line of black squares
across top row of control panel LCD.
1. Power off printer. Remove the paper path. Check all
cable connections into the controller board, especially
that the control panel cable is seated in connector J110
on the controller board. Make sure the flash memory
SIMM(s) is/are seated properly in J10/J11. Power on the
printer. If the display is still blank or has a black line, go
to step 2
2. (NOTE: If the panel is blank but the cooling fans come
on, the control panel or control panel cable is bad. If the
fans do not come on, the controller board is probably
bad.) Replace one at a time until the problem is fixed:
a) control panel assembly (page 5–14)
b) control panel cable assembly (page 5–14)
c) CMX controller board (page 5–10)
Control panel key failure.
1. Replace one at a time until the problem is fixed:
a) control panel assembly (page 5–14)
b) control panel cable assembly (page 5–14)
c) CMX controller board (page 5–10)
Ribbon folding or feed problems.
1. Clean the shuttle frame assembly (page 2–6)
2. Check the left and right ribbon guide alignment (page
4–16)
3. Check the platen gap (page 4–12)
Printer appears normal, but does not
print data sent from the host.
1. Perform a printer confidence check (page 3–34)
2. Check the host data cable connection at the rear of the
printer.
3. If the printer interface is RS–232, interchange the wires
to pins 2 and 3. This is the most common cause of a
completely inoperative RS–232 cable. Make sure the
printer and host have the same baud rate, number of
data bits, number of stop bits, and parity. In RS–232,
configure the host for XON/XOFF if possible; this
requires the least complex cable.
4. Replace the CMX controller board (page 5–10)