Epson Stylus Pro 7400 Service Manual page 194

Large format color inkjet printer
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EPSON Stylus Pro 7400/7800/9400/9800
SERVICE CALL 0001000C
Description
PG home position detection error
Explanation
The printer causes this error and stops operation if it cannot detect the PG home
position during the power-on initialization operation or while performing platen
gap changing operation after paper is set.
Possible Causes
The PG HP Sensor connector is disconnected.
The Pump Motor connector is disconnected.
The Pump Motor harness is broken.
PG HP Sensor failure
Pump Motor failure
The PG drive gears are damaged.
The fuse for the motor driver is blown. (on the Main Board)
Check Point
1.
Make sure that the PG HP Sensor and the PG drive gears are free of dust or
foreign materials.
2.
Measure the resistance value of the Pump Motor. (7.0 ± 10%[Ω])
If the motor is shorted out, replace the C594 Main Board together with the
motor.
3.
Make sure that the harnesses are connected correctly and not broken.
4.
Make sure that there is no obstacle in the gear train made up of the Pump
Motor pinion gear, PG drive gear and etc.
Remedy
1.
Reconnect the PG HP Sensor connector or the Pump Motor connector
securely.
2.
Replace the PG HP Sensor (p.245).
3.
Replace the PUMP CAP ASSY. (p.284).
Troubleshooting
SERVICE CALL 00010014
Description
Failure of pressurizing
Explanation
The printer causes this error and stops operation if it detects an abnormal condition
of the Pressure Sensor (air leak from the pressurizing mechanism) during the
power-on initialization operation or while performing ink supply operation.
Possible Causes
Pressure Motor failure
The connector of the Pressure Motor, Regulator Solenoid or Pressure Sensor
is disconnected.
The harness of the Pressure Motor, Regulator Solenoid or Pressure Sensor is
broken.
Regulator Solenoid failure (does not become ON)
Pressure Sensor failure
The Pressure Tube is disconnected.
The fuse for the Solenoid or the motor driver is blown.
(on the Main Board)
Check Point
1.
Measure the resistance value of the Pressure Motor. (7.0 ± 10%[Ω])
If the motor is shorted out, replace the C594 Main Board together with the
motor.
2.
Make sure that the harnesses are connected correctly and not broken.
Remedy
1.
Reconnect the connectors of the Pressure Motor, Regulator Solenoid or
Pressure Sensor securely.
2.
Connect the Pressure Tube.
3.
Replace the PUMP ASSY., SUPPLY (p.291).
4.
Replace the BOARD ASSY., MAIN (p.232).
Troubleshooting based on Panel Messages
Revision B
194

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