5.6 REPAIRING THE PRINTER MECHANISM
This sectionprovides instructions for repairing theprinter mechanism. It describesvarious problems,
symptom,likely causes, checkpoints, and solutions.The checkpoint columnshows itemsto be checked,
including proper values tobe set for each componentof the printer mechanism. For replacementand
adjustmentinstructions, see Chapter 3,Disassembly and Assembly,and Chapter 4, Adjustments.If the same
symptomrecurs after repair, select another item inthe list of causesand repair theprinte r accordingto those
instructions.
Table 5-8. Repairing thePrinter Mechanism
Problem
Symptom Cause Checkpoint Solution
CRoperation is
abnormal.
When the printer is
powered on, the
CR motor does not
rotate at all.
The CR motor is
defective. Measure the
coil resistance
of the motor.
Resistance is
approximately
2.7 ohms.
Replace the CR
motor. Refer to
page 3-12.
^
When the printer
is powered on,
the CR motor
does not rotate all
and all indicators
blink.
CN11 is
disconnected
from the main
board.
Check CN11. Connect CN11
correctly.
^
The CR motor
can be rotated
when the printer
is powered on.
But the CR does
not move.
The timing belt
came off the
pinon gear of
the CR motor.
Check the
engagement of
the timing belt.
Reinstall the
timing belt
correctly.
^
The CR moves
slightly and then
stops.
Platen gap is
too narrow. Manuallymove
the CR and
check that it
moves
smoothly. The
proper platen
gap is
approximately
0.37 mm.
Adjust the
platen gap
properly.
Refer to page
4-2.
^
Printer lacks
lubrication or a
foreign object is
jammed
between the oil
pad and CR
shaft.
Manually move
the CR and
check that it
moves
smoothly.
Check the
surface of the
CR shaft andoil
pad.
Replace or
lubricate the oil
pad. If any
foreign object is
jamming the
carriage,
remove it and
clean the
surface of the
CR shaft. Then
lubricate the CR
shaft.
^
HP sensor is
defective. Check the
operation of the
HP sensor.
Refer to page
5-2.
Replace the HP
sensor. Refer
the page 3-8.
FX-2170 Service Manual Troubleshooting
Rev.A 5-15