Canon LBP-860 Service Manual page 178

CHAPTER 6
M - 8
the selected paper source.
Possible cause
DC controller
PCB
Sensor PCB
(multi-purpose
tray paper
Paper feeder
driver PCB
(cassette size
switch)
DC controller
DC controller
Envelope
feeder driver
PCB (envelope
feeder paper
6-32
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Check
Has the upper cassette been selected?
Has the multi-purpose tray been
selected?
Has the lower cassette been selected?
3
Has the envelope feeder been selected?
4
Connect the printer driver tester to the
printer. When the upper cassette size
sensing stitch is pressed, does the
PAPER SIZE LED of the tester lleht?
6 When a cassette containning paper is
loaded in the printer, does the U-CASS
LED of the tester light?
7 Is the print paper loaded correctly?
Connect the printer driver Lester to the
multi-purpose tray. does the MP TRAY
LED of the tester light?
Connect the printer driver tester to the
printer. When the paper feeder
cassette size sensing switch is pressed
does the PAPER SIZE LED of the testa
light?
10 when a cassette containning paper is
loaded in the printer. does the
L-CASS. LED of the tester light?
Are envelopes loaded correctly?
12 Connect the printer driver tester to the
printer. When an envelope is loaded
in to the envelope feeder, does the
ENVELOPE SENSOR LED of the tester
light?
esult Procedure
Proceed to step 5 and
YES
subsequent steps.
Proceed to step 7 and
subsequent steps.
Proceed to step 9 and
subsequent steps.
Proceed to step 11 and
YES
subsequent steps.
Replace the pick-up motor
N O
driver PCB.
Replace the DC conlroller
PCB.
Replace the cassette paper
N O
sensor.
Load the paper correctly.
NO
Replace the DC controller
PCB.
Replace the sensor PCB.
NO
N O Replace the paper feeder
driver PCB.
YES Replace the DC controller
PCB.
N O Replace the paper feeder
N O Load the envelopes
YES Replace the DC controller
N O Replace the envelope feeder
driver PCB.