7.2 Special Mode7.2.1 Special Modes for Servicing 0013-2122This printer supports the following special modes in addition to the service mode:- PCB replacement mode- Download mode- Counter display mode1. PCB replacement modeThis mode is used when replacing the main PCB or MC relay PCB.By executing this mode,- Backup data of the settings and counter values stored in the MC relay PCB are moved to the new main PCB.- The data such as the settings and counter values are copied to the MC relay PCB.a) Entering the PCB replacement modeFollow the same procedure as that for entering the service mode.(With the "Paper Source" button and "Information" button pressed down, turn on the "Power" button.)When the printer starts up, compare the serial number memorized in the main PCB's EEPROM with that memorized in the MC relay PCB's EEPROM. Ifthey do not match, or no serial number is memorized in either EEPROM, enter the PCB replacement mode.While you are in the PCB replacement mode, the MESSAGE LED, roll media LED, and ONLINE LED are lit.b) ProcedureSelect "CPU BOARD" or "MC BOARD" using the [ ] and [ ] buttons, and then press the [OK] button to determine it.- CPU BOARDSelect this after replacing the main PCB.The data in the MC relay PCB is copied to the main PCB.- MC BOARDSelect this before replacing the main PCB.The data in the main PCB is copied to the MC relay PCB.Use this when the MC relay PCB is a new one.c) Exiting the PCB replacement modeTurning off the Power button of the printer allows you to exit the PCB replacement mode.For details on how to replace the PCB, see Parts Replacement Procedure > Disassembly/Reassembly > Points to Note on Disassembly and Reassembly >Boards.2. Download modeUse this mode only when updating the firmware without performing initialization.a) Entering the download mode1) Turning off the Power button of the printer.2) With the "Stop" and "Information" buttons pressed down, turn on the Power button of the printer.* Keep pressing the above buttons until "Initializing" appears on the display.b) ProcedureWhen "Download Mode/Send Firmware" is shown on the display, transfer the firmware.When downloading of the firmware is completed, the printer is turned off automatically.3. Counter display modeUse this mode to view only printer counter information.a) Invoking counter display mode1) Press the [MENU] button to keep [Information] > [System Info] selected.2) Press the [ ] button whole holding down the [MENU] button + [OK] button to invoke counter display mode.b) How to view counter display mode- S/N: Unit serial number- CNT: Number of copies printed in A4 terms (unit: copies)