Chapter 11-221.7.3 Precautions When Servicing Printer1.7.3.1 Notes on the Data Stored in the Printer 0013-3742This printer counts the print length, number of ink tank replacements, carriage driving time, number of cleaning operations, number of cutter operations, and so onand stores them in the main controller's EEPROM as a service mode counter.This counter provides important information about the printer usage status.You can check this information by printing it in the service mode or displaying it on the display.Following the precautions below when servicing the printer.(1) Repairing/replacing the PCBWhen replacing the main controller, follow the specified replacement procedure.Reference:For the main controller replacement procedure, see Disassembly/Reassembly > Points to Note on Disassembly and Reassembly > Boards.(2) After replacing the carriage unitThe information about the carriage driving time arises in the carriage unit. After replacing the carriage unit, select INITIALIZE > CARRIAGE in the service modeto initialize (clear) the information about the carriage driving time.(3) After replacing the purge unitThe information about the number of cleanings arises in the purge unit. After replacing the purge unit, select INITIALIZE > PURGE in the service mode to initialize(clear) the information about the number of cleanings.You cannot check the counter information once it is initialized (cleared). Be careful not to initialize the counter information before checking it.You cannot modify the counter information from the operation panel.1.7.3.2 Confirming the Firmware Version 0012-6235Firmware has been downloaded to the main controller.When you have replaced the main controller, check that the firmware is the latest version. If not, update it to the latest version.Reference:For how to up update the main controller, refer to TROUBLESHOOTING > Update.1.7.3.3 Precautions against Static Electricity 0012-6236Certain clothing may generate static electricity, causing an electrical charge to build up on your body. Such a charge can damage electrical devices or change theirelectrical characteristics.Before disassembling the printer for servicing, discharge any static buildup by touching a grounded metal fitting or the like.1.7.3.4 Precautions for Disassembly/Reassembly 0012-6238The precautions for disassembly/reassembly are described in Disassembly/Reassembly.1.7.3.5 Self-diagno stic Feature 0012-6239The printer has a self-diagnostic feature to analyze hardware problems.The self-diagnosis result is shown on the display and indicated by lamps.For detailed information, see "Error Codes".1.7.3.6 Disposing of the Lithium Battery 0012-6240The main controller PCB of this printer is equipped with a lithium battery to back up various data.Replacing the lithium battery with a wrong type can result in explosion. Dispose of the used lithium battery according to the instruction manual.