Brother HL-4000CN Service Manual page 326

A B
2.8.5 Low toner sensing
1
DRIVE PWB LOW TONER
PL15.1 SENSOR(Y)
PL12.2
J51 J441
15 3
GRY GRY
DC COM
N.C.
1
(CH1.1)
LOW TONER
SENSOR(M)
PL12.2
2
J442
17 3
GRY GRY
DC COM
N.C. 1
(CH1.1)
LOW TONER
SENSOR(C)
PL12.2
J443
33 3
GRY GRY
3 DC COM
1
N.C.
(CH1.1)
LOW TONER
SENSOR(K)
PL12.2
J444
35 3
GRY GRY
DC COM
1
N.C.
(CH1.1)
4
TONER DISPENSE MECHANISM
5
6
C D
DRIVE PWB
A
PL15.1
NO TONER
J441 NO TONER(Y) J51
2 16 CHECK
YEL YEL NO TONER
CONTROL
J42
SENSED(L) +3.3VDC
28
YEL
B
J442 NO TONER(M) NO TONER CHECK(C)
10
2 18
VIO VIO YEL
NO TONER CHECK(M)
9
YEL
C
NO TONER CHECK(Y)
8
YEL
NO TONER(C)
J443
2
34
BLU NO TONER CHECK(K)
BLU
7
YEL
D
NO TONER(K)
J444
2
36
GRY
GRY
C
A
B
VI-29
E F
MCU AND HVPS PWB
DI-c
PL15.1
(Y)
DI-d
(M)
DI-e
(C)
+3.3VDC
DI-f
(K)
CONTROL
LOGIC
J12
3
YEL
21
YEL
22
YEL
23
YEL
24
YEL
D
G H J
1
2.8.8
NO TONER
SENSED SIGNAL
1
Imaginary Line
2.8 XEROGRAPHICS