Epson FX 890 Service Manual - Page 45

PF Motor Control Signal

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FX-1180/FX-880 Service Manual Chapter 3 Troubleshooting Symptom Paper is fed abnormally. Table 3-11. Repair of the C229MAIN (continued) Condition Cause Paper is not IC 11 is fed at all. defective. Checkpoint Check for the proper PF motor phase control signals at pin 1, 2, 23 and 24, and motor driving signals at pin 3, 6, 18 and 21 of IC11. Solution Replace the C229MAIN board. Pin 1 of IC11 Pin 3 of IC 8 Self test printing is abnormal. The self test printing is not executed or a particular dot doesn't print. Any transistor of Q2 - Q10 is defective. Figure 3-19. PF Motor Control Signal Check for the proper printhead driving signal at the collector and base of Q2 - Q11 Replace the C229MAIN board. BASE of Q5 Data from the host computer is printed incorrectly. Data corruption occurs when the interface is used. Any transistor from Q11 to Q25 is defective. IC2 or CPU is defective. CORRECTOR of Q5 Figure 3-20. Pritnhead Drive Signal - - Replace the C229MAIN board. Replace C229MAIN board. Rev. B 3-15

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FX-1180/FX-880 Service Manual
Chapter 3 Troubleshooting
Rev. B
3-15
Table 3-11. Repair of the C229MAIN (continued)
Symptom
Condition
Cause
Checkpoint
Solution
Paper is fed
abnormally.
Paper is not
fed at all.
IC 11 is
defective.
Check for the proper PF motor
phase control signals at pin 1, 2, 23
and
24, and motor driving signals
at pin 3, 6, 18 and 21 of IC11.
Pin 1 of IC11
Pin 3 of IC 8
Figure 3-19.
PF Motor Control Signal
Replace the
C229MAIN
board.
Self test
printing is
abnormal.
The self test
printing is
not executed
or a
particular dot
doesn’t print.
Any
transistor of
Q2 - Q10 is
defective.
Check for the proper printhead
driving signal at the collector and
base of Q2 - Q11
BASE of Q5
CORRECTOR of Q5
Figure 3-20.
Pritnhead Drive Signal
Replace the
C229MAIN
board.
Any
transistor
from Q11 to
Q25 is
defective.
-
Replace the
C229MAIN
board.
Data from
the host
computer is
printed
incorrectly.
Data
corruption
occurs when
the interface
is used.
IC2 or CPU
is defective.
-
Replace
C229MAIN
board.