Epson Stylus Pro 4400 Service Manual page 177

EPSON Stylus Pro 4400/4450/4800/4880/4880C
SERVICE REQ. 00010000
Error meaning:
PF Motor Encoder check error
Explanation
During initial operation at power on or during PF Motor operation, there
may be a case where the encoder pulse signal can not be recognized at
specified intervals. In such a case, this message is displayed and the
printer stops operating.
Cause of trouble
Disconnected connector for the PF Encoder Sensor.
Disconnected connector for the PF Motor.
Broken wire for the PF Motor Encoder.
Inverted wiring for A and B pulses.
Inverted wiring for the PF Motor.
PF Motor short
PF Motor continuous excitation (voltage applied continuously, motor
revolutions unusual)
Broken power supply fuse for the PF motor driver (on the Main Board )
Troubleshooting
Points to be checked
1. The PF Encoder Sensor and the PF Loop Scale must be free from dust
2. Execute encoder checking by the
3. The PF Timing Belt must be free from any defects and the belt must be
4. The PF Roller must rotate smoothly, free from undue load.
5. Measure the resistance value of the PF Motor (17.9 ± 15% [Ω]).
6. All the harness must be connected properly and free from short circuit
Remedy
1. Check for dirt, paper dust or damage to the Loop Scale
2. Connect the PF Encoder Sensor connector or PF Motor connector.
3.
4. Replace the
5. Replace the
6. Replace the
Troubleshooting Based on Panel Messages
and dirt or any other foreign matters.
TESTING)" (p.91) in "Maintenance Mode 2".
in proper tension.
If the PF Motor is found in short mode, replace the BOARD ASSY.,
MAIN at the same time.
or broken wire.
PF Timing Belt Tension Adjustment (p.378)
PF Encoder Sensor (p.357)
Motor Assy., PF (p.349)
C593 MAIN Board (p.226)
Revision C
"1.4.6.1 Self Testing Menu (SELF
177