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Serial Interface Test
To perform a local diagnostic test of the serial interface:
Note: To stop the test at any time, turn the printer off.
You need a test connector to jumper the following pins:
1. Enter the printer menu and change the Diagnostic Test item in the Serial I/F group to
Yes.
2. Turn the printer off.
3. Plug the test connector into the serial interface receptacle.
4. Turn the printer on:
• The printer prints the message “LOOP TEST”
• The printer checks the memory function of the message buffer, then prints “RAM
GOOD” if the memory check is okay, or “RAM BAD” if the memory check fails.
• The signal logic is checked. If the signal logic is okay, “I/F GOOD” prints. If it is
faulty, “I/F BAD” prints.
• Hexadecimal characters from 20 to 7E are transmitted through the TD (Transmit
Data) line, and received through the RD (Receive Data) line, then written to the
message buffer. The above stored data is then printed.
• This process repeats until the printer is turned off.
5. Turn the printer off, then press and hold
MENU while turning the printer back on.
This ends the test and places you in the Menu mode.
6. Go to the Serial I/F group and change Diagnostic Test back to No.
7. Press
STORE to save the setting, then press MENU to exit the Menu mode.