Service manual

TROUBLESHOOTING GUIDE
SYMPTOM 1: Printer does not initialize when powered up.
POSSIBLE CAUSE
SOLUTIONS
1 . Power cord is damaged.
Check
that the power cord is connected properly
and is
in good condition.
2.
Power
switch is broken.
Check and replace
it if necessary.
3. Fuse is
blown.
Replace it. If it blows again, check the power
supply unit and PCB.
4. Power supply is
defective.
Check for proper voltages at the PIS connector
J4.
AC Volts
Across Pins Cable Color
26
1 and 4 Orange
9 2 and 3
Red
5.
Defective logic board.
Check
for shorts on PCB. See circuit theory on
page 7
for proper operation of power supply
circuit.
SYMPTOM 2: Printer initializes but will not print.
POSSIBLE CAUSE SOLUTIONS
1 . Ribbon cartridge is missing or Replace ribbon.
empty.
2. Paper out condition is present. Check that paper is properly inserted.
Check paper
out switch and replace if necessary.
3. Bad connection between PCB
Check mechanical connection at P1 on PCB.
and Mechanical assembly.
4. Data transmission is not
Check serial or IEEE cable for proper connection.
complete.
Check
for proper data transmission from
computer.
Check interface circuits on PCB. See circuit theory
on pages 18 and 19.
19