Table of contents 1 Theory of operation .......................................................................................................... 1 Basic operation ........................................................................................................................ 2 Function structure ...................................................................................................... 2 Operation sequence .................................................................................................. 2 Engine control system ...............................................................................................................
4 DC controller PCA ..................................................................................................... 5 Motor control ............................................................................................. 7 Motor locations ........................................................................... 7 Failure detection ......................................................................... 8 Fan control ................................................................................................ 9 Fan locations ..............................................................................
9 Failure detection ....................................................................... 10 Low-voltage power-supply PCA ................................................................................. 11 Over-current/over-voltage/overload protection ............................................ 12 Safety interruption .................................................................................... 12 Power supply voltage detection .................................................................. 13 Sleep mode .............................................................................................
13 High-voltage power-supply PCA ................................................................................ 14 Power supply illumination control ............................................................... 13 Fuser control ........................................................................................................... 16 Fuser temperature control .......................................................................... 18 Fuser heater protective function .................................................................. 18 Fuser failure detection ...............................................................................
19 Pressure roller cleaning ............................................................................. 20 Laser scanner system .............................................................................................................. 21 Laser scanner failure detection .................................................................................. 22 Laser scanner safety function .................................................................................... 22 Image-formation system ...........................................................................................................
23 Image-formation process .......................................................................................... 25 Latent-image formation block ..................................................................... 25 Step 1: Primary charging ........................................................... 25 Step 2: Laser-beam exposure ...................................................... 26 ENWW v