HP LaserJet Pro P1600 - Image Quality Issues

General circuit diagram
Figure 3-7 Circuit diagram
A
65 4 3
21
B
C D
12
J1102
12
J1101
3512 4
J1103
FANON
GND
3
2 1
GND
SI
SO
TEST
J501
4 3 2 1
321
+24P2
MTRPWM
12
J902
21
GND_24P2F
24P2F
12345
J904
321
+24P2
ACC
DEC
GND
1
2
3
4
J903
2 3 4 6 7 8 9 10 11 12 13 14 15 5 16 1
J901
1 2 3 4
J1
1234
J801
13
12
11
10
9
8
7
6
5
4
3
1
2
VDO2
/VDO2
VDO1
/VDO1
GND
+5V
/BDIR
GND
CNT0
GND GND
CNT1 CNT2
1
2
TAG
12
J3
1
2
3
4
5
6
7
8
9
10
11
13
12
J542
TAGOUT
1
2
J581
1
2
ACH
ACN
231
J104
/PISNS +3.3U GND
J551
123
+3.3U GND FSRTH /PWSNS /POSNS
J552
12345
3 1
J751
321
2
3
2
1
FSRTH
GND
2
1
J702
321321
J701
5 4 2 1 3
1
2
21
J1011
1
2
21
ACH ACN
J101
2
3
1
2
1
HV
+24P2 +24P2 +24P2
GND GND GND GND
+5R
ACC DEC
/MTRPWM
DUPSOL
MFG
FANLOCK
FANON
+24P2
J571
16
1
2
3
4
5
6
7
8
9
10
11
13
15
12
14
J304
FT1
J562
SL
+24U
1
2
1
2
1234567
J1001
1234567
J4
(G)LED1003 (G)LED1001
(Y)LED1002 (Y)LED1004
+3.3R
SW1002 SW1001
7 5 4 3 2 1
10
11
8 6
12
9
13
J531
10
1
2
3
4
5
6
7
8
9
11
13
12
GND +3.3R SCLK /VDO2 VDO2 VDO1 /RSTO GND GND SC /VDO1 /BDO GND
2
1
SW502
LED401
Duplex reverse
solenoid
Duplex connector PCA
M
M
PS901
M2
M1
FM1
SW501
SL2
TH1
H1
TP1
TP
PS702PS701
PS751
SL
SL1
SL
INL101
Formatter
Laser Drive PCA
BD
sensor
Scanner motor
Motor Drive PCA
Main motor
Main-motor rotation
number sensor
Laser/scanner unit
Engine Controller PCA
Fuser heater
Thermistor
Fuser-delivery
sensor
Pickup solenoid
Top sensor
Fuser unit
Paper sensor PCA
Top sensor PCA
Cartridge-door
switch
Power switch
Operation panel
Thermoswitch
Media-width
sensor
Main fan
Duplex model only
FANON M
DUPSOL M
FANLOCK M
FANLOCK M
TAGIN
126 Chapter 3 Solve problems ENWW