Panasonic KX-FL423RU Service Manual ▷ View online
41
KX-FL423RU-B / KX-FL423RU-W
6.12. Sensors and Switches Section
All of the sensor and switches are shown below.
Note:
See TEST FUNCTIONS - SENSOR CHECK SECTION for the sensor test.
(#815 of Service Mode test. Refer to Test Functions (P.75).
(#815 of Service Mode test. Refer to Test Functions (P.75).
6.12.1. Hook Switch
When the handset is raised, the switch is turned OFF, and the signal at pin 5 of IC601 is high.
When the handset is returned, the switch is turned ON, and the signal at pin 5 of IC601 is low.
IC601 send Hook sw status to Digital Board with other key matrix data.
Refer to Operation Board Section (P.49).
When the handset is returned, the switch is turned ON, and the signal at pin 5 of IC601 is low.
IC601 send Hook sw status to Digital Board with other key matrix data.
Refer to Operation Board Section (P.49).
Sensor Circuit Location
Sensor
Sensor or Switch Name
Message Error
Operation Panel
SW641
Document set
[CHECK DOCUMENT]
Operation Panel
PS601
Paper Feed
[REMOVE DOCUMENT]
High Voltage PCB
SW1
Printer Open
[COVER OPEN]
Regist Sensor PCB
PS531
Regist
[FAILED PICKUP]
Exit Sensor PCB
PS501
Exit
[PAPER JAMMED]
Toner Sensor PCB
IC512
Dev & Toner Set
[TONER EMPTY]
[TONER LOW]
[CHECK DRUM]
[TONER LOW]
[CHECK DRUM]
Hook PCB
SW671
Hook
————
42
KX-FL423RU-B / KX-FL423RU-W
6.12.2. Paper Feed Sensor
The Sensor detects the front edge of the document.
When there is no document, the shelter plate shuts off the sensor light, the photo-transistor turns OFF, and the input signal of
IC101-A9pin becomes a high level. When a document is detected, the shelter plate let the sensor light pass through, the photo-
transistor turns ON, and the input signal of IC101-A9pin becomes a low level.
When there is no document, the shelter plate shuts off the sensor light, the photo-transistor turns OFF, and the input signal of
IC101-A9pin becomes a high level. When a document is detected, the shelter plate let the sensor light pass through, the photo-
transistor turns ON, and the input signal of IC101-A9pin becomes a low level.
6.12.3. Document Sensor
The Sensor detects the document insertion.
When a document is detected, the switch turns ON, and the input signal of IC601-9pin becomes a low level. When there is no doc-
ument, the switch turns OFF, and the input signal of IC601-9pin becomes a high level.
When a document is detected, the switch turns ON, and the input signal of IC601-9pin becomes a low level. When there is no doc-
ument, the switch turns OFF, and the input signal of IC601-9pin becomes a high level.
Photo-transistor
Signal (IC101-A9pin)
Detect Document
ON
Low level
No Document
OFF
High level
Switch
Signal (IC601-9pin)
Detect Document
ON
Low level
No Document
OFF
High level
43
KX-FL423RU-B / KX-FL423RU-W
6.12.4. Top Cover Open Switch
The Switches detect whether the printer cover is open or closed.
When the printer cover is closed, the switches turn ON, and the input signal of IC101-N25pin becomes a low level.
When the printer cover is open, the switches turns OFF, and the input signal of IC101-N25pin becomes a high level.
When the printer cover is closed, the switches turn ON, and the input signal of IC101-N25pin becomes a low level.
When the printer cover is open, the switches turns OFF, and the input signal of IC101-N25pin becomes a high level.
Switch
Signal (IC101-N25 pin)
Open
OFF
High level
Close
ON
Low level
44
KX-FL423RU-B / KX-FL423RU-W
6.12.5. Drum Detection
DRUM SENSOR is not arranged.
DRUM unit is detected when HVERR SENSOR arranged in H.V.P.S becomes effective.
DRUM unit is detected when HVERR SENSOR arranged in H.V.P.S becomes effective.
6.12.6. Regist Sensor
The Sensor detects whether or not the recording paper is present so that printing can start.
When the recording paper is detected, the shelter plate let the sensor light passing through, the photo-transistor turns ON, and the
input signal of IC101-AD25pin becomes a low level.
When there is no recording paper, the shelter plate closes the sensor light, the photo-transistor turns OFF, and the input signal of
IC101-AD25pin becomes a high level.
When the recording paper is detected, the shelter plate let the sensor light passing through, the photo-transistor turns ON, and the
input signal of IC101-AD25pin becomes a low level.
When there is no recording paper, the shelter plate closes the sensor light, the photo-transistor turns OFF, and the input signal of
IC101-AD25pin becomes a high level.
High Voltage ERROR Status
Drum sensor
Signal (IC101-P25)
Abnormal
DRUM can not be detected Low level
Normal
DRUM can be detected
High level
Photo-transistor
Signal (IC101-AD25 pin)
No Recording Paper
OFF
High level
Recording Paper Regist
ON
Low level
Click on the first or last page to see other KX-FL423RU service manuals if exist.