power supply 16
frequency range for drive
circuit 22
troubleshooting 125
See also low-voltage power
supply; high-voltage power
supply
power-on troubleshooting
overview 125
power-save mode. See sleep settings
pre-boot menu options 107
pre-exposure process 29
pressure roller
pressurization and
depressurization control 58
primary charging process 29
primary transfer roller
engagement and disengagement
control 37
print job language (PJL) 7
Print Options menu, control panel
256
print quality
built-in troubleshooting pages
191
image stabilization controls 42
manual print modes 469
test pages 191
troubleshooting 473
print quality troubleshooting 203
Print Settings menu, control panel
253
Print Test Page 212
printing
modes, manual 469
period in operation sequence 4
process explained 26
stop for testing 154
troubleshooting 498
problem-solving
event-log messages 430
messages, types of 290
networks 274
Process Cleaning Page 285
product cold reset 507
product resets 506
product space requirements 529
protective-glass cleaners (PGCs)
laser/scanner 25
Q
quality. See print quality
R
RAM (random access memory)
formatter 5
random access memory (RAM)
formatter 5
read only memory (ROM) 5
repeating defects, troubleshooting
203
repetitive defects ruler 203
repetitive horizontal lines,
troubleshooting 481
repetitive white spots,
troubleshooting 482
Reports menu, control panel 205
resolution
troubleshooting quality 473
restore factory settings 506
restore the service ID 507
right door
jams 452
ROM (read only memory) 5
ruler, repetitive defect 203
S
safety features
when front door is open 17
Scan/Digital Send Settings menu
(M680), control panel 229
scanner
operations 77
scanner (M680)
tests 158
scanner glass
cleaning 492
scanner settings 505
scanner-motor failure 24
scanning/image capture system 77
secondary transfer processes 31
security settings information 201
sensors
ADF 77
DC controller 11
diagnostic tests 148
jam detection 62
paper feeder 65
pickup, feed, and delivery system
(M651 only) 44
pickup, feed, and delivery system
(M680 only) 44
stapling mailbox 86
tests, manual 150
tests, manual tray/bin 152
separation process 32
serial number 503
Service ID
convert to date 503
restore 503
Service menu options 501
Service menu, control panel 289
se
rvice mode
functions 501
service settings 522
settings
restore factory 506
shifted or cut-off scans (M680),
troubleshooting 489
size specifications, product 528
skew-feed prevention 54
skewed color planes,
troubleshooting 482
skewed pages
troubleshooting 480
skewed pages (M680)
troubleshooting 480
sleep mode 6
sleep settings
voltage too high during 18
slow fax reception 516
slow fax transmission 518
smeared toner (in the feed direction),
troubleshooting 489
smeared toner on leading edge,
troubleshooting 488
smeared toner or water-like marks,
troubleshooting 488
smeared toner, troubleshooting
479
solenoids
DC controller 10
paper feeder 65
pickup, feed, and delivery
system 46
stapling mailbox 86
solve connectivity problems 499
solve performance problems 498
solve problems 101
solving
direct-connect problems 499
540 Index ENWW
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