Epson LC-7211 Spezifikationen PDF herunterladen (Seite 30)

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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.

Fig. 2-8 Printer head temperature detector circuit

Control Method

Error stop (thermistor open) 0-5 0.00 -

Normal print 6-213 0.00-4.35 ~120

Unidirectional print 214-221 4.35-4.48 120-130

Print stop 222-251 4.48-4.83 Over 130

Error stop (thermistor closed) 252-255 Over 5.00 -

(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 Carriage home position detector circuit

Control Method

Output (V) Decision

5 in home position (with shield plate)

0 not in home position (without shield plate)

+5V +5V

Printer head

Thermistor

CPU

ref

AN0

R2

+5V

Detecting

signal

Temperature

°C

A/D Conversion Value

POINT

AN Voltage

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 107 108

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Epson LC-7211 Spezifikationen Seite 30