Detectors - Star Micronics LC-8211 Technical Manual

GENERAL SPECIFICATIONS

4-5. Detectors

(1) Print head temperature detectors
The A/D converter in the CPU detects the print head temperature at power on and before each line begins to print.
Control Method (by Text printing)
Print
Error stop (thermistor open)
Normal print
Unidirectional print
Print stop
(2) Home Position Detector
A photo-interrupter is used in the home detector on the printer.
ON/OFF signals are generated according to the position of the carriage. (Shield plate mounted at the base of the
carriage.) The printing position is determined by these signals.
Fig. 2-9 Printer head temperature detector circuit
A/D Conversion Value
POINT
0-5
6-221
222-225
226-251
Fig. 2-10 Carriage home position detector circuit
Output (V)
5 in home position (with shield plate)
0 not in home position (without shield plate)
– 26 –
AN Voltage Temperature
V
0.00
0.00-4.35
4.35-4.42
4.42-4.83
Decision
C
-
~130
130-135
Over 135