Key Switch And Led Lights; Lcd Panel; Sensor Circuit - Acroprint ATR120 Service Manual

8-7. Key Switch and LED lights

The key switch signals are connect to the CPU port
The LED light signals are connect to the CPU port R50 to R52 and D10~D11

8-8. LCD Panel

The LCD drive circuit is built in the CPU on Main Control PCB ass'y. Characters may be created by wiring
display data in the CPU memory.
The specification of the LCD are as follows:

8-9. Sensor Circuit

There are five sensors their functions are show below:
Name CPU port
SR
SL
LF encoder
CR encoder
SH
Measuring point (Pin NO.) Signal name
Operation voltage:
Illumination type:
Visual angle:
Driving condition:
R80 Detects the right-up edge of an inserted time card.
R81 Detects the left-up edge of an inserted time card.
D1 Detects the operating condition of the LF motor.
D0 Detects the operating condition of the CR motor.
R73 Check whether the head is at the home position(left end of the machine).
1 E-03-E
2 E-03-C
3 E-03-A
4 E-03-K
5 E-05-E
6 E-05-C
7 E-05-A
8 E-05-K
R60~R62 and D8~D9.
4.7V
Re
12 o'clock direction
1/4 duty, 1/3 bias
Functions
Description
Stand by Inserted time card and printing
0
5V
10.2V or more
9.5V or more
0
5V
9.5V or more
9.0V or more
0 4.0V or more 0
5V
10.0V or more
8.5V or more
0 4.0V or more 0
5V
8.5V nor more
7.5V or more