duplexing unit 59
components 59
motors 12
print operation 61
See also pickup, feed, and delivery
E
EIO interface 5
electrical specifications 530
embedded web server 523
engine
diagnostics 145
test page 147
engine-control system
components 8
error messages
types of 290
event log 105, 140
clear 106, 431, 501
information 202
print 431
view 431
event-log messages 430
exhaust fans 13
F
faded print 473
failure detection 62
drive circuit 22
fuser 21
laser/scanner 24
low-voltage power supply 19
motors 12
stapling mailbox 87
See also jams
fans
DC controller 13
exhaust 13
intake 13
fax
feeding problems 513
Fax Settings menu (M680), control
panel 240
feed speed control 55
feed, paper. See pickup, feed, and
delivery
feeding problems 513
firmware
date codes 202
version information 200
firmware, downloading new 523
flash memory card 5
flecks on page, troubleshooting
482
flowcharts
troubleshooting 124
formatter
resets after replacing 501
formatter connections 176
formatter control system 5
formatter lights 140
front of page dirty,
troubleshooting 481
fuser 19
components 19
control-circuit function 19
discrepancy detection 22
failure detection 21
identification 22
jams 452
life detection 22
operation 56
temperature control 20
See also fusing and delivery unit
fusing and delivery unit 56
operations 56
See also fuser
fusing process 32
G
General Settings menu, control
panel 208
H
halftone control 42
hardware integration pocket (HIP) is
not functionin 139
heat control for fuser 20
heaters
fuser 19
high-density toner on trailing edge,
troubleshooting 484
high-voltage power supply (HVPS)
bias generation 14
circuits 14
operations 14
home button is unresponsive 138
horizontal white lines,
troubleshooting 477, 478
HP embedded Jetdirect page 200
HP Jetdirect Inside (JDI) 5
HP Jetdirect print server
configuration page 200
lights 140
HVPS (high-voltage power supply)
bias generation 14
circuits 14
operations 14
I
I/O interfaces 6
image capture system 77
image density control (DMAX) 42
image halftone control (DHALF) 42
image in a particular color does not
print in the correct color,
troubleshooting
4
78
image information process 28
image quality
calibration process 40
image quality issues
examples and solutions 473
image stabilization control
DMAX, DHALF 42
image stabilization controls 42
image-formation process 26
development process 30
drum cleaning 33
fusing process 32
ITB cleaning 33
laser-beam exposure 30
pre-exposure 29
primary charging 29
primary transfer process 31
secondary transfer process 31
separation process 32
image-formation system 26
imaging drums
diagnostic test 146
individual component disagnostics
140
initial rotation period 4
input trays (optional)
operations 64
input/output interfaces 6
installation
date calculation 503
verify for optional accessories
197
intake fans 13
ENWW Index 537
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