Epson Stylus COLOR 1520 Service Manual page 128

Table 5-7. Component Repair of the C211 MAIN Board (2)
Symptom Condition
CR does not CR motor
operate does not
normally. operate
normally.
The printer PF motor
feeds paper does not
abnormally. operate
normally.
Self-test does
not perform
printing.
EEPROM must not be replace alone.
Rev. A
Cause
IC17 is defective. Check the PF drive waveform
output from the IC17.
CR motor is Check if the resistance of the
defective. motor coil is as follows;
Sub gate array Check the waveform output
IC16 is defective. from PFA0/1 (Pin 1 or 2) or
PFB0/1 (Pin 23 or 24)of the
IC16.
CPU is defective.
IC16 is defective. Check the waveforrm output
from the A (pin 6), /A (pin 3), B
(pin 8), or /B (pin 21) of the
IC16.
(Refer to the figure above.)
PF motor is Check if the resistance of the
defective. motor coil is as follows;
Sub gate array IC6 Check the waveform output
is defective. from the SBDATA (pin 24) of
the IC19 and SCDATA (pin 24)
of
the IC18 during the self-test.
CPU is defective.
Common driver IC Check the common signal
18 and IC19 are waveform output from the pin
defective. 18, 19, or 20 of the CN13 or pin
20, 21 or 22 of the CN12.
(Refer
to the figure above.)
Printhead is
defective.
CAUTION
Checkpoint
5 7 % at 25••/phase
(Refer to Table 5-1.)
10 10 % at 25••
(Refer to Table 5-1.)
Troubleshooting
Solution
Replace the IC17.
Replace the CR
motor.
Replace the
MAIN board.
Replace the MAIN
board.
Replace the MAIN
board.
Replace the PF motor.
Replace the MAIN
board.
Replace the MAIN
board.
Replace the MAIN
board or IC18 and
IC19.
Replace the printhead.
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