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 ............................................................................................. 6 Motor locations ........................................................................... 7 Failure detection ......................................................................... 7 Fan control ................................................................................................ 8 Fan locations ..............................................................................
9 Failure detection ......................................................................... 9 Low-voltage power-supply PCA ................................................................................. 10 Over-current/over-voltage/overload protection ............................................ 11 Safety interruption .................................................................................... 11 Power supply voltage detection .................................................................. 11 Sleep mode .............................................................................................
12 High-voltage power-supply PCA ................................................................................ 13 Power supply illumination control ............................................................... 12 Fuser control ........................................................................................................... 15 Fuser temperature control .......................................................................... 17 Fuser heater protective function .................................................................. 17 Fuser failure detection ...............................................................................
18 Pressure roller cleaning ............................................................................. 19 Laser scanner system .............................................................................................................. 20 Laser scanner failure detection .................................................................................. 21 Laser scanner safety function .................................................................................... 21 Image-formation system ...........................................................................................................
22 Image-formation process .......................................................................................... 23 Latent-image formation block ..................................................................... 24 Step 1: primary charging ........................................................... 24 Step 2: laser-beam exposure ....................................................... 25 ENWW v