Canon imageCLASS MF4890dw, Service Manual, Page: 5 / 511

Overview -------------------------------------------------------------------------------------2-11
Controlling the Laser Activation Timing --------------------------------------2-12
Laser ON/OFF Control -------------------------------------------------------------------2-12
Horizontal Sync Control ------------------------------------------------------------------2-12
Laser Control -----------------------------------------------------------------------2-13
Auto Power Control (APC) --------------------------------------------------------------2-13
Laser Scanner Motor Control --------------------------------------------------2-13
Overview -------------------------------------------------------------------------------------2-13
Scanner Motor Fault Detection ---------------------------------------------------------2-14
Service Works ---------------------------------------------------------------------2-14
At parts replacement ----------------------------------------------------------------------2-14
Maintenance --------------------------------------------------------------------------------2-14
Notes on service works ------------------------------------------------------------------2-14
Image Formation System ------------------------------------------------- 2-15
Overview/Configuration ---------------------------------------------------------2-15
Overview -------------------------------------------------------------------------------------2-15
Print Process --------------------------------------------------------------------------------2-15
Static Latent Image Formation Block -------------------------------------------------2-16
Development Block------------------------------------------------------------------------2-17
Transfer Block ------------------------------------------------------------------------------2-17
Fixing Block ---------------------------------------------------------------------------------2-18
Drum Cleaning Block ---------------------------------------------------------------------2-18
High-Voltage Control -------------------------------------------------------------2-19
Overview -------------------------------------------------------------------------------------2-19
Generating Primary Charging Bias ----------------------------------------------------2-19
Generating Developing Bias ------------------------------------------------------------2-19
Generating Transfer Bias ----------------------------------------------------------------2-19
Toner Cartridge --------------------------------------------------------------------2-20
Toner Level Detection --------------------------------------------------------------------2-20
Specification of Toner level display ----------------------------------------------------2-20
Operation when toner level is Low/Nearly Out -------------------------------------2-20
Toner Cartridge Absence/Presence Detection -------------------------------------2-21
Service Works ---------------------------------------------------------------------2-21
At parts replacement ----------------------------------------------------------------------2-21
Maintenance --------------------------------------------------------------------------------2-21
Notes on service works ------------------------------------------------------------------2-21
Fixing System ---------------------------------------------------------------- 2-22
Overview/Configuration ---------------------------------------------------------2-22
Overview -------------------------------------------------------------------------------------2-22
Main Parts of Fixing assembly ---------------------------------------------------------2-22
Various Control Mechanisms --------------------------------------------------2-23
Fixing Temperature Control -------------------------------------------------------------2-23
Protective Functions ----------------------------------------------------------------------2-23
Other Functions -------------------------------------------------------------------2-24
Throughput Down Control ---------------------------------------------------------------2-24
Service Works ---------------------------------------------------------------------2-25
At parts replacement ----------------------------------------------------------------------2-25
Maintenance --------------------------------------------------------------------------------2-25
Notes on service works ------------------------------------------------------------------2-25
Pickup And Feeding System --------------------------------------------- 2-26
Overview ----------------------------------------------------------------------------2-26
Overview -------------------------------------------------------------------------------------2-26
Detecting Jams --------------------------------------------------------------------2-27
Jam Detection Outline --------------------------------------------------------------------2-27
Delay Jams ----------------------------------------------------------------------------------2-28
Reversal Delay Jam --------------------------------------------------------------2-29
Stationary Jams ----------------------------------------------------------------------------2-30
Other Jams ----------------------------------------------------------------------------------2-31
Service Works ---------------------------------------------------------------------2-32
At parts replacement ----------------------------------------------------------------------2-32
Maintenance --------------------------------------------------------------------------------2-32
Notes on service works ------------------------------------------------------------------2-32
External And Controls System ------------------------------------------- 2-33
Power Supply ----------------------------------------------------------------------2-33
Power Supply -------------------------------------------------------------------------------2-33
Protective Functions ----------------------------------------------------------------------2-33
Service Works ---------------------------------------------------------------------2-34
At parts replacement ----------------------------------------------------------------------2-34
Maintenance --------------------------------------------------------------------------------2-34
Notes on service works ------------------------------------------------------------------2-34
3 Periodical Services
Periodically Replaced Parts ------------------------------------------------3-2
Periodically Replaced Parts ----------------------------------------------------- 3-2
Consumables ------------------------------------------------------------------3-2