HP LASERJET ENTERPRISE CP4020 - Printer Functions and Maintenance; Sensor and Switch Testing; Component and Paper Path Tests; HP Easy Printer Care Software

S Tray 3 paper present sensor ....................................................... 265
T Tray 3 feed sensor ...................................................................... 265
U Tray 3 paper surface 1 and 2 sensors ........................................ 265
V Tray 3 paper size switches .......................................................... 265
W Tray 4 paper present sensor ...................................................... 265
X Tray 4 feed sensor ...................................................................... 265
Y Tray 4 paper surface 1 and 2 sensors ........................................ 265
Z Tray 4 paper size switches .......................................................... 266
a Tray 5 paper present sensor ....................................................... 266
b Tray 5 feed sensor ....................................................................... 266
c Tray 5 paper surface 1 and 2 sensors ......................................... 266
d Tray 5 paper size switches .......................................................... 266
5V laser and 24V interlock and logic switches (and power
switch) ............................................................................................ 267
New ITB sensor .............................................................................. 271
Tray 3, 4, and 5 right door switch ................................................... 272
Paper-path sensors test .................................................................................. 273
Print/stop test .................................................................................................. 273
Component tests ............................................................................................. 274
Component test (special-mode test) ............................................... 274
Diagrams ......................................................................................................................... 277
Block diagrams ................................................................................................ 277
Plug/jack locations .......................................................................................... 280
Location of connectors .................................................................................... 281
DC controller connector locations ................................................... 281
Controller PCA (1 x 500-sheet and 3 x 500-sheet optional paper
feeders) ......................................................................................... 283
Locations of major components ...................................................................... 284
General timing chart ........................................................................................ 294
Circuit diagrams .............................................................................................. 294
HP Easy Printer Care ...................................................................................................... 298
Open the HP Easy Printer Care software ....................................................... 299
HP Easy Printer Care software sections ......................................................... 299
Internal print-quality test pages ........................................................................................ 302
Print-quality-troubleshooting pages ................................................................. 302
Diagnostics page ............................................................................................. 305
Cleaning page ................................................................................................. 306
Configuration page .......................................................................................... 307
Configuration page ......................................................................... 307
HP embedded Jetdirect page ......................................................... 309
Embedded protocol page ............................................................... 310
Finding important information on the configuration pages .............. 311
Color-band test ................................................................................................ 311
Print-quality troubleshooting tools .................................................................................... 312
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