Brother HL-4000CN Service Manual page 311

A B
2.6.1 Tray1 paper stacking
TRAY1 SENSOR AND SWITCHES
1
OPERATOR
LOADED PAPER
2
B
3
4
5
6
C D E
A
TRAY1 SIZE SWITCH
ASSY
PL4.2
SW1
SW2
SW3
J471
2
YEL
TRAY1 NO PAPER
SENSOR
PL4.3
DRIVE PWB
PL15.1
J47
3
YEL
DC COM
(CH1.1)
J472
3
5 YEL
YEL
+3.3VDC
(CH1.1)
2
6
BLU BLU
DC COM
(CH1.1)
TRAY1 LOW PAPER
SENSOR
PL4.3
J473
8 YEL 3
YEL
+3.3VDC
(CH1.1)
9 2
YEL YEL
DC COM
(CH1.1)
VI-14
2.6 Paper Supplying
F G
1
DI-18
DRIVE PWB
TRAY1 SIZE SWITCH1
PL15.1
J471 ON(L) +3.3VDC J47 J42 J12
4 1 16
YEL YEL YEL YEL
TRAY1 SIZE SWITCH2
ON(L) +3.3VDC
3 2 17
YEL YEL
YEL YEL
TRAY1 SIZE SWITCH3
ON(L) +3.3VDC
1 4 18
YEL YEL YEL YEL
DI-11
TRAY1 NO PAPER
J472 SENSED(H) +3.3VDC
1 7 19
BLU BLU YEL YEL
A
DI-15
TRAY1 LOW PAPER
J473 SENSED(H) +3.3VDC
1 10 20
BLU BLU YEL
YEL
B
Refer the relationship
1
between the status of TRAY1
SIZE SWITCH ASSY and display
of Diagnostic code "DI-18".
H J
TRAY1
2.7.1
PAPER STACK
POSITIONED
MCU AND HVPS PWB
PL15.1
2
+3.3VDC
TRAY1
2.6.4
SIZE SWITCH1
CONTROL
SIGNEL
LOGIC
15
2
+3.3VDC
TRAY1
2.6.4
SIZE SWITCH2
SIGNEL
14
2
+3.3VDC
TRAY1
2.6.4
SIZE SWITCH3
SIGNEL
13
2
+3.3VDC
TRAY1
2.6.4
NO PAPAR
SENSED SIGNEL
12
2 Imaginary Line
+3.3VDC
11
Paper Size SW1 SW2 SW3 Display
ON 00
LEGAL14" ON ON
LEGAL13" ON ON OFF 01
EXECUTIVE ON OFF ON 02
OFF 03
B5 ON OFF
A4 OFF ON ON 04
ON 06
LETTER OFF OFF
ON
A5 OFF ON
No Cassette OFF OFF OFF 07