Epson MX-80 Technical Manual page 34

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(b)
The Printer has been adjusted so that the head driving pulse width becomes 0.4
msec when +24VDC is applied to the print head.
Stepper motor driver
The stepper motor driver functions to amplify two two-phase excitation signals, as
well as to lower the applied voltage of each motor so that the motor is not exposed
to unwanted heat when it is not driven. Both the carriage and paper feed stepper
motors require a mean current of approx. 0.3A when they are driven by two two-
phase excitation signals. The carriage stepper motor operates at approx. 500 pulses
per second when the Printer performs normal character printing at 80 columns.
(9) Switches and indicators on control panel
The MX-80 has three switches and four indicators on its control panel. All the four indica
tors are green LED's. while the three switches are of non-lock type. Refer to the MX-80
Operation Manual for detailed information on the functions of the respective switches
and indicators. The switches and indicators on the control panel are connected to the
ports of the LSI 8041 or 8049 and their operations are under the software control of the
LSI. Fig. 2.22 shows the locations of the switches and indicators on the control panel,
and Table 2.7 shows the 9 signal lines extending from the control circuit board to the
control panel.
Power Switch
I!!• i lOFF
PQWgP 0
•owe* 0
•c*s» 0
Control Panel
Fig. 2.22 Switches and Indicators on control Panel
Table 2.7 Signal Lines from Control Circuit to Control Panel
Connector
Pin No.
Signal Name
Description of Signal
Color of Lead
1 ON LINE LP
Signal for illuminating ON LINE indicator
Purple
2 PE LP
Signal for illuminating NO PAPER indicator
White
3 READY LP
Signal for illuminating READY indicator
Gray
4 ON/OFF LINE SW
ON LNE switch
Yellow
5
FFSW FORM FEED switch
Orange
6 LF SW
LINE FEED switch
Blue
7
GL
Ground
Black
8
-1-12
+ 12VDC, •
Brown
9
BUZZER Buzzer
Red
2-21
REV. A