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Platen-open detector mechanism
The platen-open detector mechanism has a microswitch which detects whether the platen is
open (printing impossible because the thermal head is away from the platen) or closed
(printing possible). The microswitch can be OFF only when the frame, platen is perfectly
closed, and at all other times is ON.
Head temperature detector mechanism
The thermal head has a thermistor to detect the temperature of the thermal head.
Black mark detector mechanism
The black mark mechanism is a device which can be attached inside the paper guide mechanism
to determine the printing position when using pre-printed thermal paper. This mechanism uses
the reflective photo sensor.
2-10 Operation Principles
<printer side>
Pin No.
15
The pin No.s 14 and 15 can be reversed.
Figure 2-13 Platen-open detector circuit
220 Ω
0 to 100 KΩ
10 KΩ
<printer side>
Figure 2-14 Black mark detector circuit
14
platen open
SW2
platen open
SW1
Pin No.
13
V
DD
12
black mark detector
output
7, 8, 10
GND
Rev. A
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