Operating Mode (Panel Switch Operation); Self Test Mode - Epson TM-L90 Developer's Manual

Confidential
Receive buffer
The capacity of the receive buffer is set using memory switch Msw1-2. A receive buffer full
means that the receive buffer is in the following condition. The printer ignores the data received
when the remaining space in the receive buffer is 0 bytes..
Memory switch
Msw1-2
ON
OFF

Operating Mode (Panel Switch Operation)

Self Test Mode

In self test mode, following items are checked and printed out:
• Control circuit functions
• Printer mechanisms
• Print quality
• Control software ROM version
• DIP switch settings
• Memory switch setting
• Paper layout setting
Use the following procedure to start a self test.
1. First, open the paper roll cover, then close the paper roll cover while presssing and holding
down the FEED button until ERROR LED blinks. The printer prints out the various printer
states.
2. When all printer states have been printed, make sure that the following message is
displayed and the PAPER OUT LED blinks.
"If you want to continue SELF-TEST printing, please press FEED button."
The printer is now in the self test wait mode.
3. To start a test print, press the FEED button when the printer is in the self test wait mode.
4. Make sure that the following message is displayed.
"*** completed ***"
The printer will now be initialized and return to normal operating mode.
Rev. A
Receive buffer
capacity
45 bytes When the remaining space in the receive buffer drops to 128 bytes, the
printer status becomes "buffer full" and it remains "buffer full" until the
4 Kbytes
space in the receive buffer increases to 256 bytes.
TM-L90 Developer's Guide
Buffer full definition
Description of Functions 3-11