Panasonic KX-F1200 Service Manual And Technical Manual page 113

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[Paper top Sensor (PSg02)]
When the recording paper is loaded to print head, the shelter plate shuts the sensor light, the pt_ototra_sistor becomes OFF.
And the input signal of IC401-44 (CPU) becomes high level. Usally, the shelter plate passes the sensor light, the
phototransistor becomes ON, and the input signal of IC401-44 pin becomes low level.
SHELTER PLATE
Psg°21;
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i B
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CN902
i
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Sensor P.C.B.
1
2
3
+5V
/
CN413 _ R566
IC401
44
P73
52
P34
Digital P.C.B.
Phototransistor Signal (IC401-44 pin)
Paper Pass OFF High level
No Paper ON Low level
All interrupt Sensor LED current is controlled by IC401-52 pin.
(e.g. PS904, PS902, PS905)
[Cover Sensor (SW1)]
When the upper cabinet is closed, SWl becomes OFF and IC401-47 pin goes to high level. Vice versa, cabinet is open, SW1
becomes ON and IC401-47 pin goes to Low level.
+5V
/
SWl CN1 ON2 R568_
3 _ +SV
R613
IC401
47 P76
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