paper feed problems 467
PBX systems 518
power 125
print quality issues 473
process 124
repeating defects 203
reports and tools 140
scanner calibration 129
scanning subsystem (M680) 129
skewed pages 480
slow fax reception 516
slow fax transmission 518
status page 140
text 480
toner smear 479
USB cables 498
wired network 499
wrinkles 481
See also diagnostics
Troubleshooting menu, control
panel 280
U
understand lights on the formatter
formatter lights 140
understand the lights on the
formatter
connectivity LED 140
connectivity LED, product 141
connectivity LED, product
operating 143
heartbeat LED 143
HP Jetdirect LEDs 143
upgrade firmware 523
upgrades, downloading product
firmware 523
USB Firmware Upgrade menu, control
panel 289
USB flash drive 524, 525
USB interface 5
USB port
troubleshooting 498
Use Requested Tray 266
V
version, hardware firmware 200
vertical density variation,
troubleshooting 482
vertical streaks or bands,
troubleshooting 476
vertical white lines all colors,
troubleshooting 477
vertical white lines,
troubleshooting 477
VoIP 515
voltage detection
DC controller 18
W
waiting period 4
warnings iii
warranty date information 503
white halo, troubleshooting 483
white spots, troubleshooting 475
wrinkles, troubleshooting 481
542 Index ENWW
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