QM7500 Technical Manual
QM31930/03093 Rev AD
Troubleshooting 5
Figure A: Barrel Terminal Wiring Diagram
Prints unrecognizable characters
when displayed correctly.
Power supply has recycled and
the QM7500 has defaulted to the
Hebrew language.
1. Type in the correct language
code for the language you are
using. (If English is the
language being used type
ENGL.)
2. Zap the controller by keying in
ZAP Shift A.
CAUTION: Zapping the controller
will result in the loss of all print
parameter settings (dot size,
character width, print delay). These
will need to be reset after the ZAP
routine.
Message prints backwards or is
too long.
One of the two photocells are
dirty.
1. Clean the photocells.
2. Manually set the conveyor
direction, eliminating the need
for two photocells. See your
Owner’s Manual for instructions
on setting the conveyor
direction.
Photocell is defective.
Replace the photocell board. (See
page 15.)
Keyboard is not responding.
Contacts on the PC board are
dirty.
Clean the contacts.
Contacts on the back of the
keypad are dirty.
Clean the contacts.
Problem
Possible Cause
Solution
light brown
pink
brown
white
red
yellow
purple
gray
green
orange
blue
black
