Panasonic KX-F910BX Service Manual page 135

KX-F910BX
[Cover Open Sensor (SW271)]
When the upper cabinet is closed, the plate push the switch lever, the input signal of IC151-33pin (ANALOG)
becomes low level. When there is opened, the plate leaves the switch lever, the input signal of IC151-33pin (ANALOG)
becomes high level.
[Read Position Sensor (PI301)]
When an document is brought to read position, the shelter plate pass the sensor light, the phototransistor becomes ON,
and the input signal of IC301-15pin (Operation) becomes low level. When there is no document at the read position, the
shelter plate shuts the sensor light, the phototransistor becomes OFF, and the input signal of IC301-15pin (Operation)
becomes high level. (When checking this sensor condition, IC301-16 pin becomes low level).
PLATE
SW271
Analog Board
Close
Open
+5V
R331
Operation Board
Out of the Read Position
At the Read Position
+5V
R271
R272
C271
Signal (IC151-33 Pin)
Low level
High level
SHELTER PLATE
+5V
R333
Phototransistor
OFF
ON
|144 |
IC151
33
IC301
15
XLD12
16
LED11
Signal (IC301-15 Pin)
High level
Low level