Panasonic KX-FM330GR Service Manual page 202

KX-FP320G / KX-FM330G
3. [Cover Open Sensor (PI303)]
When the operation panel cover is closed, the shelter plate is lifted, the phototransistor becomes ON, and the input signal of
IC301-20 pin (Operation) becomes a low level. When the cover is opened, the shelter plate shuts the sensor light, the
phototransistor becomes OFF, and the input signal of IC301-20 pin (Operation) becomes a high level.
4. [Hook Switch (SW401)]
When the handset is lifted, the switch turns ON, and the signal at pin 2 of IC6 becomes low.
When the handset is brought back, the switch turns OFF, and the signal at pin 2 of IC6 becomes high.
5. [Paper Set Switch (SW3)]
When the recording paper is set in place and the PAPER SET LEVER is pulled toward you, the plate is separated from the
switch lever, causing the signal at IC6 pin 4 to become high. When the recording paper is installed and the PAPER SET LEVER
is pushed back, the plate presses down on the switch lever, causing the signal at IC6 pin 4 to become low.
Open
Closed
Set recording paper
No recording paper
Operation Board
Phototransistor Signal (IC301-20 pin)
OFF
ON
Phototransistor Signal (IC501-152 pin)
OFF
ON
160
High level
Low level
High level
Low level