Sensors; Led/Key And Buzzer - SNBC BTP-2002NP Service Manual

Confidential

6.6 Sensors

Problems
Connection of the sensor cable is
not reliable
The cable or connector of sensor is
abnormal
Paper can not
Paper sensor is dirty
be detected
Paper sensor is abnormal.
Detection circuit is abnormal.
Incorrect paper near end sensor
setting
Connection of the sensor cable is
not reliable
The cable or connector of sensor is
Paper near end
abnormal
can not be
detected
Paper near end sensor is dirty
Paper near end sensor is abnormal
Detection circuit is abnormal
Connection of the sensor cable is
not reliable
The cable or connector of sensor is
Top cover open
abnormal
can not be
Micro switch is abnormal
detected
Detection circuit is abnormal

6.7 LED/KEY and Buzzer

Problems
Connection of the LED/KEY or
FEED button cable is not reliable
The cable or connector of LED/KEY
LED or FEED
is abnormal
button does not
LED/KEY is abnormal
work
LED/KEY switch circuit is abnormal
Indication circuit is abnormal
Buzzer is abnormal
Buzzer does not
work
Indication circuit is abnormal
Possible Causes
Possible Causes
Check Method
Check Detector circuit with
oscilloscope
Check detection circuit with
oscilloscope
Check detection circuit with
oscilloscope
Check Method
Check detector circuit with
oscilloscope
Check detector circuit with
oscilloscope
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BTP-2002NP Service Manual
Solution
Connect the cable reliably
Replace the cable or connector
Clear paper sensor with alcohol
cotton
Replace paper sensor
Replace main control board
Adjust the sensor to the correct
position
Connect the cable reliably
Replace the cable or connector
Clear paper near end sensor with
alcohol cotton
Replace paper near end sensor
Replace main control board
Connect the cable reliably.
Replace the cable or connector
Replace micro switch
Replace main control board
Solution
Connect the cable reliably
Replace the cable or connector
Replace LED/KEY
Replace switch circuit board
Replace main control board
Replace buzzer
Replace main control board