Epson Stylus Pro 7400 Service Manual page 195

EPSON Stylus Pro 7400/7800/9400/9800
SERVICE CALL 0001001B
Description
Head driver (TG) temperature error
Explanation
The printer causes this error and stops operation if it detects an abnormal internal
temperature of the printhead by the thermistor in the head while performing
printing operation without firing ink from the nozzles.
Possible Causes
The printhead internal temperature rises because of a printing operation
without firing ink.
A breakdown of the printhead
Poor contact, short or disconnection of the tape electric wires
Main Board failure. (A/D of the CPU is damaged)
Remedy
1. Check if the printer can recover from the error by turning it OFF and back
ON.
2. Replace the PRINT HEAD (p.267).
3. Replace the BOARD ASSY., MAIN (p.232).
Troubleshooting
SERVICE CALL 0001001D
Description
CR servo parameter error
Explanation
The printer causes this error and stops operation when it detects that a voltage
beyond the prescribed range is output to the CR Motor.
Check Point
1. Make sure that the CR Encoder and the Timing Fence are free of dust or
foreign materials.
2. Perform the Encoder check by the
TESTING)"
3. Make sure that the CR Timing Belt is normal and its tension is appropriate.
4. Make sure that the Carriage moves smoothly without any abnormal load.
5. Make sure that the CR Motor is not shorted out.
If the motor is shorted out, replace the C594 Main Board together with the
motor.
6. Make sure that the harnesses are connected correctly and not broken.
Remedy
1. Clean dirt or paper dust on the Timing Fence and check if it is damaged.
2. Execute the
3. Replace the CR Encoder Sensor (p.246).
4. Replace the CR MOTOR ASSY. (p.243).
5. Replace the BOARD ASSY., MAIN (p.232).
Troubleshooting based on Panel Messages
"1.4.6.1 Self Testing Menu (SELF
(p.106).
CR Timing Belt Tension Adjustment
Revision B
(p.306).
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