Epson Stylus pro 7900 Repair Manual page 210

Pro 7900 and 9900 Field Repair Guide
Main Explanation
Board
Errors
1A26 RTC Communication Error
1A37 Thermistor Sensor Error
1A38 Transistor Environment
Temperature Error
1A39 Print Head Error
1A40 IC22 Error
1A41 Head Rank Id Input Error
Printer Error Codes (Service)
Description
The RTC circuit on the Main
Board is malfunctioning.
The Thermistor on the
Print Head reports an over
temperature condition
The Thermistor on the
Print Head reports tempera-
ture out of range.
The Print Head reports an
error.
The Destination Setting
(Country Setting) on the
Main Board is wrong
Head Rank Data is wrong
Printer Component, Software Item,
Remedy
1. Unplug the Printer.
2. Remove the Battery for 30 seconds.
3. Re-install the Battery.
4. Using the
RTC USBID
5. Replace the Main Board.
1. Re-seat the Print Head Cables on the
Main Board side.
2. Re-seat the Print Head Cables on the
Print Head side.
3. Replace the Main Board.
4. Replace the Print Head.
1. Replace the Print Head.
1. Replace the Print Head.
1. Correct the destination setting.
2. Replace the Main Board.
1. Re-enter the Head Rank Data.
2. Replace the Main Board.
LCD Display, Printer Button
Adjustment Wizard run the
adjustment.
10/6/10
Page 210.