Panasonic KX-FP342CX Service Manual page 171

7.6.2. DOCUMENT SET SW (SW353)................."CHECK DOCUMENT"
When a document is set, the SW turns ON, and the input signal of IC301-9 pin (Operation)
becomes a low level. When there is no document, the SW turns ON, and the input signal of IC301-
9 pin (Operation) becomes a high level.
Operation Board
No document
Set document
7.6.3. COVER OPEN SW (SW502)................"COVER OPEN "
When the operation panel cover is closed and a film is set, the SW becomes ON, and the input
signal of IC520-36 pin (Digital) becomes a low level. When the cover is opened, the SW becomes
OFF, and the input signal of IC520-36 pin (Digital) becomesa high level.
Sensor Board
Cover open
Cover closed
7.6.4. HOOK SWITCH (SW101)
When the handset is lifted, the switch turns OFF, and the signal at pin 25 of IC501 becomes high.
When the handset is returned, the switch turns ON, and the signal at pin 25 of IC501 becomes
Photo transistor Signal (IC301-9 pin)
OFF
ON
SW Signal (IC520-36 pin)
OFF
ON
High level
Low level
High level
Low level
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