Epson STYLUS PRO 4910 - Page 64

Epson Stylus Pro 4900/Epson Stylus Pro 4910 Revision A
TROUBLE SHOOTING Remedies for Service Call Error 65
Confidential
157B
ASF Sub Motor over
speed error
Detects, when accelerating/decelerating the motor, that it is
being driven at an irregularly faster speed than the specified
value.
 Irregular load
 ASF Sub Motor Assy encoder failure
 ASF Sub Motor failure
 SUB Board is damaged.
 ASF Sub Motor driver failure
Carry out “Encoder Check” to check if the ASF Sub Motor
Assy encoder functions normally. (See P.399)
1. Replace the ASF Sub Motor
Assy. (See P.203)
2. Replace the SUB-B Board. (See
P.162)
3. Replace the Main Board. (See
P.152)
157C
ASF Sub Motor
reversing error
Detects accumulatively more than the specified number of
times that it is being driven in the opposite direction to the
specified driving direction.
 The polarity of ASF Sub Motor Assy cable is opposite.
 ASF Sub Motor Assy encoder failure
1. Check the connection of the ASF Sub Motor Assy (CN213,
CN214) for disconnection and wrong installation.
2. Carry out “Encoder Check” to check if the ASF Sub Motor
Assy encoder functions normally. (See P.399)
Replace the ASF Sub Motor Assy.
(See P.203)
157D
ASF Sub Motor driving
time-out error
Detects that the driving period is irregularly long.
 Irregular load
 Firmware becomes out of control.
---
Replace the Main Board. (See
P.152)
157E
ASF Sub Motor
velocity deviation error
Detects, when accelerating/decelerating the motor, that it is
being driven at an irregularly faster speed than the specified
value.
 Irregular load
 ASF Sub Motor Assy encoder failure
 ASF Sub Motor failure
 SUB Board is damaged.
 ASF Sub Motor driver failure
Carry out “Encoder Check” to check if the ASF Sub Motor
Assy encoder functions normally. (See P.399)
1. Replace the ASF Sub Motor
Assy. (See P.203)
2. Replace the SUB-B Board. (See
P.162)
3. Replace the Main Board. (See
P.152)
157F
ASF Sub Motor lock
error
1. Connection failure of the ASF Sub Motor Assy.
2. Detects that it is being driven at an irregularly slower speed
than the specified value.
 Irregular load
 ASF Sub Motor Assy encoder failure
 ASF Sub Motor failure
1. Check the connection of the ASF Sub Motor Assy (CN213,
CN214) for disconnection and damage.
2. Carry out “Encoder Check” to check if the ASF Sub Motor
Assy encoder functions normally. (See P.399)
Replace the ASF Sub Motor Assy.
(See P.203)
1581
Paper eject position
error
When paper eject position is shifting, it cannot be shifted
properly or this operation itself cannot be detected (Release =>
low load star wheels => high load star wheels).
 Foreign object is stuck.
 Connection error of the Eject Star Wheels Position Sensor
 Eject Star Wheels Position Sensor failure
 Edge Release Assy encoder failure
 Edge Release Assy failure
1. Check if any foreign object is stuck in the paper eject
mechanism.
2. Check the connection of the Eject Star Wheels Position
Sensor (CN235) for disconnection and damage.
3. Carry out “Sensor Check” to check if the Eject Star Wheels
Position Sensor functions normally. (See P.394)
4. Carry out “Encoder Check” to check if the Edge Release
Assy encoder functions normally. (See P.399)
1. Replace the Eject Star Wheels
Position Sensor.
2. Replace the Edge Release Assy.
(See P.199)
Code Error Name Cause Check Item Remedy