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drive circuit
power-supply frequency
range 17
drum cleaning 28
duplex printing (double-sided)
Show Me How menu 314
duplexer
specifications, physical 501
duplexing unit
components 52
duplex-drive assembly,
removing 151
jam causes 397
motors 8
print operation 53
See also pickup, feed, and
delivery
E
EIO cards
part number 427
reset by NVRAM
initialization 423
electrical specifications 502
electrostatic discharge (ESD) 69
embedded protocol page 310
end-of-life disposal 509
energy specifications 502
engine
diagnostics 243
test page 240
engine-control system
components 4
Enhanced I/O (EIO) card
buffer overflow 346
settings 334
Enhanced I/O card
part number 427
envelopes
jams 405
environment, specifications 503
Environmental Product
Stewardship Program 507
error messages
alphabetical list xvii
event log, listed
numerically 378
numerical list 345
types of 345
ESD (electrostatic discharge) 69
European Union, waste
disposal 509
event log
clear 377
information 311
messages, listed
numerically 378
reset by NVRAM
initialization 423
sample 377
view or print 239
exhaust fans xvii
F
faded print 410
failure detection
drive circuit 17
fuser 16
lasers and scanners 19
low-voltage power supply 13
motors xvii
See also jams
fans
cartridge, removing 137
DC controller 9
delivery, removing 143
exhaust xvii
exhaust, removing 169
intake xvii
locations xxviii
Power-supply fan,
removing 152
FCC regulations 506
feed speed control 48
feed, paper. See pickup, feed, and
delivery
Finnish laser safety
statement 513
firmware
date codes 311
version information 309
firmware, downloading new 424
flowcharts
troubleshooting 239
formatter
operations 2
PCA, removing 78
resets after replacing 420
formatter lights 242
fuser
components xvii
control-circuit function 14
discrepancy detection 17
drive assembly, removing 211
error messages 350
failure detection 16
identification 17
jam causes 394
jams 346
life detection 17
motor, removing 200
temperature control 15
Se
e also
fusing and delivery unit
fusing and delivery unit
operations 48
See also fuser; pickup, feed, and
delivery
fusing process 27
H
halftone control 36
hard disk
initialization 423
hard drive
removing 79
hard drive, removing 79
heartbeat LED 243
heat control for fuser 15
heaters, fuser 14
help
Show Me How menu 314
high-voltage power supply
bias generation xvii
circuits xvii
operations 10
removing, lower 163
removing, upper 196
HP Customer Care 500
HP Easy Printer Care
opening 299
options 299
using 299
HP Jetdirect print server
configuration page 309
lights 242
humidity requirements 503
humidity values, printed 305
ENWW Index 517