Epson Stylus Color 980 Service Manual page 95

EPSON Stylus Color 980
Table 3-23. CR Motor does not Operate
Step Check Point
1 Getting ready The connector used to control the CR motor is indicated
for inspecting in the figure below. Using the oscillo scope, check for the
waveforms. waveform for each phase at the indicated connector.
To check the waveform, press the Load/Eject button to
attempt to move the carriage. Be sure to leave the cable
for the CR motor connected.
NOTE: The GND can be output by placing the probe of
2 Check of the While trying to drive
waveform and the CR motor, the
remedies waveform output
from each phase
should be as shown
in the figure. If the
waveform output
from each phase is
as shown below,
replace the CR
motor. If not,
replace the IC12 (CR motor driver IC) or C380 Main
board.
NOTE: The GND can be output by placing the probe of
Troubleshooting
Action
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.
the oscillo scope to the tapped hole in the
bottom plate on the board with a screw.
Table 3-24. PF Motor does not Operate
Step Check Point
1 Getting ready
for inspecting
waveforms.
2 Check of the
waveform and
remedies.
Overview
Action
The connector used to control the PF motor is indicated
in the figure below. Using the oscillo scope, check for 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 PF 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.
While trying to drive
the PF motor, the
waveform output from
each phase should be
as shown in the
figure. If the
waveform output from
each phase is as
shown in the figure,
replace the PF motor.
If not, replace the
IC11 (PF motor driver IC) or C380 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 A
91