HP Laserjet 4 Manual

paper feed
assembly removal 6-18 
paper feed guide removal 6-62 
paper feed system 5-1, 5-26 
paper jam 7-20 
detection 5-11 
PS1 7-20 
troubleshooting 7-20 
paper motion 5-2 
paper path
MP tray 5-29 
PC tray 5-30 
paper pickup motor 5-10 
paper pickup rollers 4-11 
paper sensors 7-20 
paper size sensing, lower cassette 7-16 
paper specifications 2-3 
paper tray switch settings 5-9 
paper, loading optional lower cassette
3-45 
parallel
communication 3-31 
DOS commands 7-53 
parallel menu 3-33, B-22...

PS5
check 7-44 
MP tray trailing edge sensor 5-7 
PS6, lower cassette paper-out sensor
5-7 
PS7, envelope feeder paper-out sensor
5-7 
R
RAM size 3-24 
Random Horizontal Black Lines 7-40 
READY 7-B 
rear door removal 6-8 
recycling program
Toner Cartridge 4-7 
registration
adjustment 6-35 
leading edge adjustment 6-35 
related documentation 1-7, B-8 
removal
font door cover 6-10 
formatter pca 6-29 
gear assembly 6-38 
left side cover 6-7 
MP tray separation 4-11 
PC tray pickup roller 4-13 
top cover...

service checkpoints 4-1, 4-3 
Service Mode 3-20, B-25 
service/error messages 3-59 
setting the cold reset B-27 
setting the page count 3-21, B-26 
setting up the envelope feeder 3-50 
settings, tray switch 5-9 
sheet feeder installation 3-44 
signals
fan motor 5-10 
main motor 5-10 
Microswitch 5-8 
Photosensor 5-6 
scanner motor 5-10 
solenoid 5-5 
site requirements 2-1 
Skip demo B-28 
SL1, PC pick-up roller clutch solenoid
5-5 
SL2, MP pick-up roller clutch solenoid
5-5 
SL3 lower cassette pickup...

Error messages 7-2 
general information 7-1 
infrared B-38 
Message Summary Table 7-2 
messages 7-2 
preliminary 7-1 
Printer messages 7-2 
quick checks 7-1 
Status messages 7-2 
Troubleshooting, IR port B-38 
U
unpacking the printer 3-43 
user maintenance 4-2 
V
variable, customization 3-22 
version number 3-26 
vertical dark streaks 7-35, 7-46 
vertical sync late (41.4) 7-28 
vertical white streaks 7-35, 7-40 
voltage checks 7-69 
voltage test points 7-69 
W
W0 JOB 600/A4 7-11 
W1 IMAGE ADAPT 7-11 
W2...

SN-1  Service Notes 

SN-2  Service Notes 

SN-3  Service Notes 

SN-4  Service Notes 

SN-5  Service Notes 

SN-6  Service Notes