CHAPTER 4 IMAGE FORMATION SYSTEMCOPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)4-2B. Basic Operation of Image Formation System (black develop-ing assembly, 2 copies)Figure 4-102ONWMUPRWMUPCOPY START keySCRV SCRVSTBY INTR SCFW SCFWAERLSTR STBYMain motor(M1)/pre-exposure lampScanner movementScanner home positionsensor (Q5) signalScanning lamp(LA1)Primary/transfercorona assemblyForwardGrid bias ON/OFFDeveloping bias DCcomponentDeveloping bias ACcomponentLIGHT INTENSITYCONTROL commandBackward