Fukuda Denshi FCP-7101, Service Manual

Page: 28 / 170

Chapter 2
2 - 8
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Cannot perform key operations.
Item to Check Method of Checking and Corrective Action Place to Check
Cable Check that the KEY cable is connected to P2 and the
KEY BOARD.
Check that the parts around P2 are properly
mounted. P2
Key cable
REFERENCE
P5-32
Key signal
Check that the signal corresponding to the key
pressed is at “L” level.
P2 pins 3 to 10.
Key scan signal
REFERENCE
P5-32
●
Does not detect mark on z-fold paper. Does not detect end of paper.
Always displays "No recording paper" warning.
Item to Check Method of Checking and Corrective Action Place to Check
Program setting Check whether the recording paper is set at roll
paper or not. Program setting (recording
paper)
Sensor Verify that the mark sensor area is free of foreign
matter and that the sensor is securely attached. Mark sensor
Connector Verify that the sensor cable is securely connected
and not broken. Verify also that the soldering of the
connector P6 on the MAIN BOARD is free of defect. P6
REFERENCE
P5-34
Mark drive signal Check that 2kHz rectangular waves are input to P6
pin 4. If not, IC8 or IC20 may be faulty.
P6 pin 4, IC8 ， IC20
REFERENCE
P5-29
，
34
Detection signal At a status where the magazine is closed and other
than a mark on the recording paper is aligned with
the sensor, check whether or not the waveform
coming from IC16 pin 7 is 2 kHz.
If the above signal is not detected, check the mark
sensor and mark drive signals.
IC16 pin 7
，
Mark sensor
REFERENCE
P5-34