Diagnostic Aids
3-27
Infoprint 1120 and 1125
Fuser Operation
Hot Roll Fuser
The hot roll fuser is made up of two primary assemblies. The first
assembly is the top fuser cover which contains the thermistor/cable,
thermal fuse, cable assembly, left and right lamp brackets and cover.
This is a complete assembly and the parts cannot be individually
replaced as in previous Lexmark laser printers.
The thermal fuse (two fuses in series) protects the fuser assembly
and surrounding parts from ignition in the event of a failure in the
fuser control circuitry by opening the AC circuit to the lamp. The
thermistor assembly is designed to keep the temperature of the
fuser hot roll within a predetermined temperature by being in contact
with the fuser hot roll and changes resistance as the temperature of
the hot roll increases. The thermistor resistance changes from
approximately 150K ohms to approximately 260K ohms as the
temperature of the fuser hot roll increases. The thermistor is
connected to the fuser control board connector J2-1 and J2-2 and
from J2 to J1-2 and J1-3 on the fuser control board to J16-2 and
J16-3 on the engine board. J16-2 (THERMGND) and J16-3
(THERM) are connected to module U10. U10 monitors the change
in thermistor resistance and sends a signal (HEATON) from J30-A25
through the interconnect board to CN3-9 on the LVPS to signal the
triac to turn the fuser lamp on or off to maintain the correct fuser
temperature.
The voltage drop across the thermistor is proportional to the fuser
temperature and varies from approximately 2.0 V dc (cold) to 2.3 V
dc (warm during idle) to approximately 2.7 V dc during continuous
printing. These voltages are assuming the fuser temperature is set
to normal. The HEATON signal from CN3-9 varies from 0 V dc (lamp
on) to +5 V dc (lamp off) and is connected to the cathode of an Opto
triac to control the fuser lamp. The second part of the assembly is
the fuser frame which contains the hot roll, backup roll, and
associated parts as well as the paper exit guide assembly, narrow
media sensor, fuser control board and the envelope conditioner
solenoid.
Summary of Contents for Optra T522
Page 7: ...viii Service Manual Infoprint 1120 and 1125 ...
Page 9: ...x Service Manual Infoprint 1120 and 1125 Class 1 Laser Statement Label ...
Page 23: ...xxiv Service Manual Infoprint 1120 and 1125 ...
Page 161: ...3 30 Service Manual Infoprint 1120 and 1125 ...
Page 223: ...5 2 Service Manual Infoprint 1120 and 1125 ...
Page 230: ...Connector Locations 5 9 Infoprint 1120 and 1125 Engine Board ...
Page 231: ...5 10 Service Manual Infoprint 1120 and 1125 Controller Board Non Network ...
Page 232: ...Connector Locations 5 11 Infoprint 1120 and 1125 Controller Board Network ...
Page 234: ...Connector Locations 5 13 Infoprint 1120 and 1125 ...
Page 236: ...Connector Locations 5 15 Infoprint 1120 and 1125 210 220 001 002 ...
Page 238: ...Connector Locations 5 17 Infoprint 1120 and 1125 ...
Page 241: ...5 20 Service Manual Infoprint 1120 and 1125 ...
Page 245: ...7 2 Service Manual Infoprint 1120 and 1125 Assembly 1 Covers ...
Page 247: ...7 4 Service Manual Infoprint 1120 and 1125 Assembly 2 Frame ...
Page 249: ...7 6 Service Manual Infoprint 1120 and 1125 Assembly 2 Frame continued ...
Page 251: ...7 8 Service Manual Infoprint 1120 and 1125 Assembly 3 Printhead ...
Page 253: ...7 10 Service Manual Infoprint 1120 and 1125 Assembly 4 Paper Feed Autocompensator ...
Page 255: ...7 12 Service Manual Infoprint 1120 and 1125 Assembly 5 Paper Feed Multipurpose Unit ...
Page 257: ...7 14 Service Manual Infoprint 1120 and 1125 Assembly 6 Paper Feed Alignment ...
Page 259: ...7 16 Service Manual Infoprint 1120 and 1125 Assembly 7 Paper Feed Output ...
Page 261: ...7 18 Service Manual Infoprint 1120 and 1125 Assembly 8 Integrated Paper Tray 500 Sheet ...
Page 263: ...7 20 Service Manual Infoprint 1120 and 1125 Assembly 9 Main Drive ...
Page 265: ...7 22 Service Manual Infoprint 1120 and 1125 Assembly 10 Developer Drive ...
Page 267: ...7 24 Service Manual Infoprint 1120 and 1125 Assembly 11 Hot Roll Fuser ...
Page 269: ...7 26 Service Manual Infoprint 1120 and 1125 Assembly 12 Transfer ...
Page 271: ...7 28 Service Manual Infoprint 1120 and 1125 Assembly 13 Charging ...
Page 273: ...7 30 Service Manual Infoprint 1120 and 1125 Assembly 14 Electronics 1 ...
Page 275: ...7 32 Service Manual Infoprint 1120 and 1125 Assembly 14 Electronics I continued ...
Page 277: ...7 34 Service Manual Infoprint 1120 and 1125 Assembly 15 Electronics II ...
Page 279: ...7 36 Service Manual Infoprint 1120 and 1125 Assembly 16 Electronics III ...
Page 281: ...7 38 Service Manual Infoprint 1120 and 1125 Assembly 17 Electronics IV ...
Page 283: ...7 40 Service Manual Infoprint 1120 and 1125 Assembly 18 Electronics V ...
Page 285: ...7 42 Service Manual Infoprint 1120 and 1125 Assembly 19 Electronics VI ...
Page 287: ...7 44 Service Manual Infoprint 1120 and 1125 Assembly 20 250 Sheet Tray ...
Page 289: ...7 46 Service Manual Infoprint 1120 and 1125 Assembly 20 250 Sheet Tray continued ...
Page 291: ...7 48 Service Manual Infoprint 1120 and 1125 Assembly 21 Integrated Paper Tray 250 Sheet ...
Page 293: ...7 50 Service Manual Infoprint 1120 and 1125 Assembly 22 500 Sheet Tray ...
Page 295: ...7 52 Service Manual Infoprint 1120 and 1125 Assembly 22 500 Sheet Tray continued ...
Page 297: ...7 54 Service Manual Infoprint 1120 and 1125 Assembly 23 Duplex Unit ...
Page 299: ...7 56 Service Manual Infoprint 1120 and 1125 Assembly 23 Duplex Unit continued ...
Page 301: ...7 58 Service Manual Infoprint 1120 and 1125 Assembly 23 Duplex Unit continued ...
Page 303: ...7 60 Service Manual Infoprint 1120 and 1125 Assembly 24 Envelope Feeder ...
Page 305: ...7 62 Service Manual Infoprint 1120 and 1125 Assembly 25 High Capacity Feeder ...
Page 307: ...7 64 Service Manual Infoprint 1120 and 1125 Assembly 25 High Capacity Feeder continued ...
Page 309: ...7 66 Service Manual Infoprint 1120 and 1125 Assembly 25 High Capacity Feeder continued ...
Page 311: ...7 68 Service Manual Infoprint 1120 and 1125 Assembly 25 High Capacity Feeder continued ...
Page 313: ...7 70 Service Manual Infoprint 1120 and 1125 Assembly 25 High Capacity Feeder continued ...
Page 315: ...7 72 Service Manual Infoprint 1120 and 1125 Assembly 26 Kiosk Vertical Paper Adapter ...
Page 317: ...7 74 Service Manual Infoprint 1120 and 1125 Assembly 27 Kiosk Horizontal Paper Adapter ...
Page 323: ...7 80 Service Manual Infoprint 1120 and 1125 ...
Page 333: ...I 10 Service Manual Infoprint 1120 and 1125 ...