Epson SQ-B50/2550 Technical Manual page 240

REV.-A
I
Select RS interface.
[ LF:8143 FF:lnternal
LF key: select #8143 (optional serial interface)
FF key: select internal serial interface as standard.
This mode starts a loop back test.
In this mode, the printer itself outputs serial data, receives the data, and checks if communication is
normal.
The data transmitted and received are displayed on the LCD.
If transmission or reception cannot be executed, press any switch. The LCD displays which is not
working, transmission or reception.
In this mode, operation at 150, 300, 600, 1200, 2400, 4800, 9600, and 19200 BPS is tested.
22: PF motor drive
Select this mode to drive the paper feed motor.
In this mode, the following displays appear on the LCD:
LF:speed L/E:start
IMODE=O COUNTER= 10001
LF: Select the paper feed speed (mode).
L/E:Execute paper feed.
COUNTER: Step value of paper feed motor.
Press the ON-LINE switch during paper feeding to stop the paper feed motor.
Press the ON-LINE switch again to exit this mode.
23: PF phase HI/LO
Whe thal the waveforms from IC2A and IC3B for the paper feed motor can be easily observed.
To exit this mode, press the ON-LINE switch.
24: Trig. plug on/off
Use this mode to check the operation of the release trigger plunger.
When this mode is selected, the plunger is driven (turned on or off).
Check that operation is normal by listening to the sound made by the plunger.
LF-+ON, FF-+END
LF: Trigger plunger ON
FF: Exit this mode
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