Epson Stylus Pro 4400 - Page 177

EPSON Stylus Pro 4400/4450/4800/4880/4880C Revision C
Troubleshooting Troubleshooting Based on Panel Messages 177
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 )
 Points to be checked
1. The PF Encoder Sensor and the PF Loop Scale must be free from dust
and dirt or any other foreign matters.
2. Execute encoder checking by the "1.4.6.1 Self Testing Menu (SELF
TESTING)" (p.91) in "Maintenance Mode 2".
3. The PF Timing Belt must be free from any defects and the belt must be
in proper tension.
4. The PF Roller must rotate smoothly, free from undue load.
5. Measure the resistance value of the PF Motor (17.9 ± 15% [Ω]).
If the PF Motor is found in short mode, replace the BOARD ASSY.,
MAIN at the same time.
6. All the harness must be connected properly and free from short circuit
or broken wire.
 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. PF Timing Belt Tension Adjustment (p.378)
4. Replace the PF Encoder Sensor (p.357)
5. Replace the Motor Assy., PF (p.349)
6. Replace the C593 MAIN Board (p.226)