
Unit 8: Checking/Adjustment Procedures
GL4xxe Series Service Manual
8-6
UPDATING THE PRINTER FIRMWARE
Performing a firmware update is done as follows:
1. Make sure the printer is connected properly to a computer via a working interface cable.
2. Turn the printer ON while holding down the ENTER and CANCEL buttons. You can release the buttons when
the printer has completed its startup cycle and the screen shows “FIRMWARE Download Mode”.
3. On the host computer, execute the relevant software or command to initiate the firmware uploading.
4. After successful completion of the firmware update, turn the printer OFF and disconnect the interface cable.
5. Turn the printer ON again, and set all the necessary printer settings erased by the firmware update process.
WARNING: Many USER MODE and ADVANCED MODE settings will be cleared by a
firmware update. Prior to any firmware update, make sure to note down any USER
MODE, ADVANCED MODE settings via a FACTORY TEST PRINT. You can set the
customized values back in the new firmware later.
WARNING: Do NOT turn the printer or host computer OFF abruptly during the actual
firmware updating process. Otherwise the printer’s Flash ROM and firmware may be
damaged, leading to a complete printer failure.
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