Epson Stylus 820 Service Manual page 91

Troubleshooting
5.4 Repair of PRINTER MECHANISM (M-4C10)
Any problems related to the printer mechanism should be repaired according to the troubleshooting
procedures in Table 5-7.
Table 5-5. Repair of the Printer Mechanism
Symptom Condition
The PF motor
fails to rotate at
power on.
The pump
mechanism
does not Used ink does
operate. not go through
the used ink
tube during the
cleaning
operation.
The carriage
The carriage
motor fails to
motor does
rotate at power
not rotate.
on.
The carriage
The carriage
does not
motor rotates,
operate
but the carriage
normally at
does not move.
power on
(after the
carriage has
been
manually
The carriage
centered
moves slightly
prior to
and then stops.
power on).
5-6
Cause
Measure the coil
PF motor is
resistance of the CR motor.
defective.
21 Ω ± 1Ω
Carriage flag is Check the flag on the back
defective. of the carriage unit.
The tube is not
Check that the tube is
properly
properly connected to the
connected to the
cap.
cap.
The ink tube is
Check the ink tube visually.
damaged.
The cap is Check for any defective
defective. part.
Replace the pump to see if
The pump is
this causes the ink to be
defective.
absorbed normally.
Replace the printhead to
The printhead is
see if this causes the ink
defective.
to be absorbed normally.
Check the PG value.
PG value is
(1.18 mm ± 1/100)
incoorect.
CRHP sensor is Check voltage reaction at
defective. pin 1 on CN8.
Measure the coil
The carriage
resistance of the CR motor.
motor is defective.
22 Ω ± 7%
The pulley is Check for broken or worn
defective. pulley.
Check that the timing belt
is properly inserted into
The timing belt is
the bottom of the carriage.
defective.
Check the timing belt for
any damage.
Check whether the
carriage moves smoothly
Carriage
when moved manually.
movement is not
smooth.
Check tension of the
timing belt.
Stylus Color IIs / Stylus 820
Checkpoint
Remove any
foreign
substance.
Replace the
carriage unit.
Insert the tube
properly.
Replace the
tube.
Replace the
head cap.
Replace the
pump unit.
Replace the
printhead.
Remove any
foreign
substances.
Replace
CRHP.
Replace the
carriage
motor.
Replace the
driven pulley.
Reinsert the
timing belt.
Replace the
timing belt.
Clean and
lubricate the
carriage.
Adjust tension
of the timing
belt.
Solution
Rev. A