Brother International HL-3400CN Service Manual - Page 300
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CHAPTER 8 TROUBLESHOOTING Error Code Concerned Part L1 (Beam Detecting Error) Laser Unit Confirm the connection of an laser unit connector. NO Is the connector PDCN properly connected ? Are the connector LCN1 and LCN of MCTL properly connected 4 YES V Replace the laser unit. ov. Is L1 error cleared ? YES I VO Replace the MCTL PCB. Connect the connector properly. 41 Is L1 error cleared ? YES I NO Job is complete. MCTL CN PD _ SGND +5V-1R LDU PDCN BDT ® 20 LCNI E LCN3 Laser Unit SM SM 8-42
CHAPTER
8
TROUBLESHOOTING
Error
Code
L1
(Beam
Detecting
Error)
Concerned
Part
Laser
Unit
Confirm
the
connection
of
an
laser
unit
connector.
Is
the
connector
PDCN
properly
connected
?
Are
the
connector
LCN1
and
LCN
of
MCTL
properly
connected
NO
Is
L1
error
cleared
?
4
I
NO
YES
V
Replace
the
laser
unit.
o.
v
Is
L1
error
cleared
?
I
VO
Replace
the
MCTL
PCB.
YES
Connect
the
connector
properly.
41
YES
Job
is
complete.
MCTL
CN
PD
_
SGND
LDU
+5V
-1R
BDT
®
20
PDCN
LCNI
E
LCN3
Laser
Unit
SM
SM
8-42