Epson SEIJ98006 Service Manual page 94

EPSON Stylus Color 900
Table 3-25. Pump/ASF Motor does not Operate
Step Check Point
1 Getting ready for The connector used to control the Pump/ASF motor
inspecting is indicated in the figure below. Using the oscillo
waveforms. scope, check the waveform for each phase output
from the indicated connector. To check the
waveform, press the Load/Eject button to attempt
the ASF paper feeding. Be sure to leave the cable
for the Pump/ASF motor connected.
NOTE: The GND can be output by placing the
Troubleshooting
Action
probe of the oscillo scope to the tapped
hole in the bottom plate on the board with a
screw. Note the connector has no ground
line since this printer drives the motor with
the bipolar system.
Table 3-26. Pump/ASF Motor does not Operate (continued)
Step Check Point
2 Check of the
waveform and
remedies.
Overview
Action
While trying to drive the Pump/ASF motor, the
waveform output from each phase should be as
shown below. If the waveforms output from each
phase are as shown below, replace the Pump/ASF
motor. If not, replace the IC13 (Pump/ASF motor
driver IC) or C265 Main board.
NOTE: The GND can be output by placing the
probe of the oscillo scope to the tapped
hole in the bottom plate on the board with a
screw.
Revision C
94