EPSON Stylus Color 900 Revision C
Troubleshooting Overview 94
Table 3-25. Pump/ASF Motor does not Operate Table 3-26. Pump/ASF Motor does not Operate (continued)
Step Check Point
Action
1 Getting ready for
inspecting
waveforms.
The connector used to control the Pump/ASF motor
is indicated in the figure below. Using the oscillo
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
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.
M/C
M/C
CRH PE ASF
RED
WHT
BLK
M/C
Phase A, Phase B, Phase /A, Phase /B
from the Pin 1 m ark
Step Check Point
Action
2 Check of the
waveform and
remedies.
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.
