Epson Stylus COLOR 900 Service Manual page 83

EPSON Stylus COLOR 900/900N
Table 3-24. Pump/ASF Motor Does Not Work
Problem
Is the pump/ASF The connector used to control the Pump/ASF motor
motor defective? Is is indicated in the figure below. Using an
the pump/ASF motor oscilloscope, check the waveform for each phase as
driver located on the shown. Press the Load/Eject button to cause the
main board printer try to produce the waveform and feed paper.
defective?
NOTE: Ground one of the probes to the shield
Solution
B L K
M / C
M / C
W H T
R E D
C R H P E A S F
plate on which the board is mounted. Note
that the connector itself has no ground line
since the pump/ASF motor is a two-phase
motor.
[Continued in next table.]
Table 3-25. Pump/ASF Motor Does Not Work (continued)
Problem
[Continued from The output waveforms should be as shown below. If
previous table.] the waveforms appear as shown, replace the Pump/
ASF motor. Otherwise replace IC13 (the pump/ASF
motor driver IC) or the C265 Main board.
2 0 V
2 0 V
Chapter 3 Troubleshooting
Solution
2 0 µ
µ
2 0
80