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Lexmark Optra S Service Manual - Page 161

Diagnostic Aids, mounted on the board and the envelope conditioner solenoid on - s 1250

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4059-XXX 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 J2-6 and J2-7 on the engine board. J2-6 (TEMPIN+) and J2-7 (TEMPIN-) are connected to module PLCC U9. U9 monitors the change in thermistor resistance and sends a signal (HEATON) from J20-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 (which has the exit sensor mounted on the board) and the envelope conditioner solenoid on the model 2420, 2450, 2455, 3455, 1620, 1625, 1650 and 1855. The model 2420, 2450 and 2455 printer fuser temperature is 200.8 degrees C while printing at 600 dpi and 163.9 degrees C while printing at 1200 dpi. The model 1620, 1625 and 1650 printer fuser temperature is 185.5 degrees C while printing at 600 dpi and 145.5 degrees C while printing at 1200 dpi. The model 1250 and 1255 printer fuser temperature is 206.9 degrees C while printing at 600 dpi and 151.5 degrees C while printing at 1200 dpi. The model 3455 printer fuser temperature is 270 degrees C while printing at 600 dpi and 170 degrees C while printing at 1200 dpi. Diagnostic Aids 3-28

Section	Page
1. General Information	22
Options	25
Maintenance Approach	26
Tools Required For Service	26
Acronyms	27
2. Diagnostic Information	28
Start	28
Service Error Codes	29
User Status Messages	39
User Error Messages	43
Power-On Self Test (POST)	51
Symptom Tables	52
Service Checks	55
Charge Roll Service Check	56
Cover Open Switch/Cable Service Check	58
Dead Machine Service Check	59
Duplex Option Service Check	62
Envelope Feeder Option Service Check	66
Erase Lamp Service Check	73
Fan Service Check	74
Fuser Service Check	75
Fuser Envelope Conditioner Solenoid Service Check	78
Input Sensor Service Check	84
Input Tray(s) Option Service Check	85
High Capacity Feeder Input Tray Service Check	88
Main Drive Service Check	100
Operator Panel Service Check	101
Options Service Check	103
Output Bin Sensor Standard Tray Service Check	105
Output Expander Service Check	106
Paper Feed Service Check	113
Parallel Port Service Check	116
Printhead Service Check	116
Print Quality Service Check	118
Smart Cartridge Service Check	129
Serial Port Service Check	131
Toner Sensor Service Check	131
Transfer Roll Service Check	132
3. Diagnostic Aids	134
Diagnostic Mode	134
Device Tests	135
Quick Disk Test	135
Disk Test/Clean	135
Flash Test	136
Disabling Download Emulations	136
Duplex Tests	137
Duplex Quick Test	137
Duplex Sensor Test	138
Duplex Motor Test	138
Duplex Feed 1 Test	140
Duplex Feed 2 Test	140
Error Log	141
Viewing the Error Log	141
Clearing the Error Log	141
Hardware Tests	142
LCD Test	142
Button Test	142
DRAM Memory Test	143
ROM Memory Test	143
Parallel Wrap Test	144
Serial Wrap Test	145
Input Tray Tests	147
Input Tray Feed Test	147
Input Tray Sensor Test	147
Output Bin Test - Standard Bin	148
Output Bin Feed Test	148
Output Bin Sensor Test	149
Output Bin X Sensor Test	149
Base Sensor Test	150
Print Registration	151
Printer Setup	152
Setting the Page Count	152
Viewing the Permanent Page Count	152
Maintenance Page Count (2420/2450/2455/3455)	153
Setting Configuration ID	153
Restore EP Factory Defaults	154
Print Tests	155
Print Quality Test Pages	156
Printing Menu Settings Page	157
Autocompensator Operation	158
Autoconnect System, Paper Tray Options, Envelope Feeder and Output Expander Operations	159
Fuser Operation	160
Paper Feed Jams	162
4. Repair Information	164
Handling ESD-Sensitive Parts	164
Adjustment Procedures	165
Duplex Motor Drive Belts	165
Fuser Solenoid Adjustment	166
Gap Adjustment	166
Printhead Assembly Adjustment	167
Paper Alignment Assembly Adjustment	168
Screw Identification Table	170
Removal Procedures	175
Covers	175
Center Pan Assembly	181
Controller Board	182
Developer Drive Assembly	183
Duplex Board	184
Duplex Front Cover Assembly	184
Duplex Front Cover Door	184
Duplex Front Cover Door Switch	184
Duplex Motor	185
Engine Board	186
EP Frame Assembly	186
Fans	187
Fuser	189
Fuser Board	190
Fuser Cover	191
Fuser Detack Fingers	192
Fuser Detack Housing Assembly	192
Fuser Transfer Plate	193
Fuser Envelope Conditioner Solenoid	194
Fuser Exit Flag Assembly	194
Fuser Exit Roll Assembly	195
Fuser Lamp	196
Fuser Lower Exit Guide Assembly	196
High Voltage Power Supply	197
Inner EMC Shield	198
Inner Paper Deflector Assembly	199
Integrated Tray Compensator Assembly	200
Integrated Tray Compensator Pick Roll Assembly	201
Interconnect Board Assembly	202
Left Side Frame	204
Low Voltage Power Supply	206
Main Drive Assembly	207
Main Drive Motor	208
Multipurpose Tray/Lower Deflector Assembly	209
Operator Panel	211
Operator Panel Cable/Cover Open Switch Assembly	212
Optional 250/500 Paper Tray Assembly	213
Outer EMC Shield	214
Paper Alignment Assembly	215
Paper Input Sensor	216
Paper Size Sensing Board	217
Pick Roll	217
Printhead	218
Redrive Assembly	219
Right Side Frame	220
Smart Cartridge Contacts	221
Toner Sensor	222
Transfer Roll Assembly	223
Upper Paper Deflector Assembly	223
Upper Front Cover Hinge Assembly	224
Upper Front Cover Interlock Switch Assembly	225
5. Connector Locations	226
Low Voltage Power Supply	226
High Voltage Power Supply	228
Engine Board	229
Fuser Board	236
Interconnect Board	239
Envelope Option Board	242
Duplex Option Board	244
Autoconnect - Top	246
Output Expander Control Board - Level 1 Stepper Motor	247
Output Expander Control Board - Level 2 DC Motor	249
6. Preventive Maintenance	251
Safety Inspection Guide	251
Lubrication Specifications	251
Scheduled Maintenance (2420/2450/2455/3455)	252
7. Parts Catalog	253
How To Use This Parts Catalog	253
Assembly 1: Covers	254
Assembly 2: Frame	258
Assembly 3: Printhead	262
Assembly 4: Paper Feed (Autocompensator)	264
Assembly 5: Paper Feed - Multipurpose Unit	266
Assembly 6: Paper Feed - Alignment	268
Assembly 7: Paper Feed - Output	270
Assembly 8: Integrated Paper Tray - 250 Sheet	272
Assembly 9: Main Drive	274
Assembly 10: Developer Drive	276
Assembly 11: Fuser	278
Assembly 12: Transfer	284
Assembly 13: Charging	286
Assembly 14: Electronics	288
Assembly 15: 250 Sheet Tray	300
Assembly 16: 500 Sheet Tray	304
Assembly 17: 500/500 Dual Tray	308
Assembly 18: Duplex	312
Assembly 19: Output Expander	318
Assembly 20: Envelope Feeder	322
Assembly 21: High Capacity Feeder	326
Assembly 22: Kiosk - Vertical Paper Adapter	336
Assembly 23: Kiosk - Horizontal Paper Adapter	338
Assembly 24: Options	340
Assembly 25: Miscellaneous	342

Match case Limit results 1 per page

Diagnostic Aids

3-28

4059-XXX

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 J2-6 and J2-7

on the engine board. J2-6 (TEMPIN+) and J2-7 (TEMPIN-) are

connected to module PLCC U9. U9 monitors the change in

thermistor resistance and sends a signal (HEATON) from J20-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 (which has the exit sensor

mounted on the board) and the envelope conditioner solenoid on the

model 2420, 2450, 2455, 3455, 1620, 1625, 1650 and 1855.

The model 2420, 2450 and 2455 printer fuser temperature is 200.8

degrees C while printing at 600 dpi and 163.9 degrees C while

printing at 1200 dpi.

The model 1620, 1625 and 1650 printer fuser temperature is 185.5

degrees C while printing at 600 dpi and 145.5 degrees C while

printing at 1200 dpi.

The model 1250 and 1255 printer fuser temperature is 206.9

degrees C while printing at 600 dpi and 151.5 degrees C while

printing at 1200 dpi.

The model 3455 printer fuser temperature is 270 degrees C while

printing at 600 dpi and 170 degrees C while printing at 1200 dpi.