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Unit 4: Printer Configuration
CT4i Series Operator Manual 4-13
4.4.8 Errors during Font and Program Download Modes
• Possible causes of errors could be that the data transfer is not correct between the printer and host,
due to interface setting incompatibilities or faults in the cable.
The flash ROM may be in a state that does not permit data being written to it. The following error
diagnostics are useful to help you troubleshoot the actual cause(s):
CAUTION
• Make sure that you do NOT turn the printer OFF when data is transferring to the flash ROM in
Program or Boot Download mode, as it may corrupt the firmware and prevent the printer from starting
up correctly.
• Ensure that the printer is running on a stable power supply during such flash ROM writing operations.
Cause ONLINE ERROR BUZZER
LED
Display
Flash ROM Error OFF ON 1 long beep O
Error during data download OFF OFF 1 long beep F
Error during font download ON ON 3 short beeps F