Brother International HL-3400CN Service Manual - Page 287
voltageLEDON-N/P
UPC - 012502526223
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HL-3400CN SERVICE MANUAL Error Code E4 Concerned Part Toner Sensor PCB.(LED side) Confirm the connection of a toner sensor PCB.(LED side) connector. DCN7 of IOD1 properly connected with a connector of the toner sensor ? NO Tr YES Check the voltage(LEDON-N/P) _t-
HL-3400CN
SERVICE
MANUAL
Error
Code
E4
Concerned
Part
Toner
Sensor
PCB.(LED
side)
Confirm
the
connection
of
a
toner
sensor
PCB.(LED
side)
connector.
DCN7
of
IOD1
properly
connected
with
a
connector
of
the
toner
sensor
?
Tr
YES
Check
the
voltage(LEDON-N/P)
NO
NO
Connect
them
properly.
_t
-
Is
E4
error
cleared
?
YES
<5
a
signal
voltage
between
DCN7-7
and
9
to
be
a
rising
edge(+241/)
?›
YES
Replace
the
toner
PCB.
NO
sensor
NO
<s
a
signal
voltage
between
DCN1-15
41
to
be
trailing
TO,
Replace
the
IOD1
PCB.
and
a
edge
yYES
4
4
NO
Is
E4
error
cleared
?
Replace
the
MCTL
PCB.
YES
V
Job
is
complete.
Job
is
complete.
MCTL
IOD1
r7,‘
Toner
Empty
PCB.
DCN1
DCN7
lICN
7
Lui
LED0N-P
7
7
1
41
15
TLSCHK
SGND
41
15
8
9
8
9
8
9
2
3
LED0N-N
SGND
8-29