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SuperScript 4400 — Maintenance Guide
19. Mottle -
Variation of the optical density is found in the image.
Main Causes
1.
Transfer unit is not locked into place.
2.
Improper assembly of the transfer roller.
3.
THV output of DC high voltage unit is not normal.
4.
Failure of the toner module.
5.
Deformation of the paper.
Countermeasures
1.
Confirm that the transfer unit is firmly locked into place.
1.
Ensure that the transfer roller is properly installed.
1.
Replace the DC high voltage unit with a new unit. (See Chapter 7)
1.
Replace the toner module with a new module.
2.
Replace the Photoconductor belt module. (See Chapter 6)
Fusing Unit
Transfer Unit
Paper Discharger
Unit
Transfer Roller
Transfer Drum
Paper Feeding
Roller
Drum Cleaner
Summary of Contents for Super Script 4400
Page 1: ...NEC SuperScript 4400 4400N Maintenance Guide 18 September 1998 Part Number 703 A0240 001 ...
Page 3: ...i SuperScript 4400 Maintenance Guide ...
Page 61: ...52 SuperScript 4400 Maintenance Guide ...
Page 71: ...62 SuperScript 4400 Maintenance Guide ...
Page 125: ...116 SuperScript 4400 Maintenance Guide ...
Page 189: ...180 SuperScript 4400 Maintenance Guide Toner Sensor TPD Toner Sensor TTR Fram Ass y ...
Page 193: ...184 SuperScript 4400 Maintenance Guide Stay A Ass y Transfer Drum ...
Page 203: ...194 SuperScript 4400 Maintenance Guide Stay A Ass y ...
Page 267: ...258 SuperScript 4400 Maintenance Guide ...
Page 273: ...264 SuperScript 4400 Maintenance Guide ...
Page 287: ...XIV SuperScript 4400 Maintenance Guide F G H I J ...
Page 289: ...XVI SuperScript 4400 Maintenance Guide ...
Page 293: ...ii Superscript 4200N and 4400 Series Maintenance Guide Addendum ...
Page 295: ...iv Superscript 4200N and 4400 Series Maintenance Guide Addendum ...
Page 302: ...7 ...
Page 314: ...19 NOTES ...
Page 315: ...20 Superscript 4200N and 4400 Series Maintenance Guide Addendum ...
Page 316: ......