CHAPTER 10 TROUBLESHOOTINGCOPYRIGHT © 1999 CANON INC. CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 10-17B. Electrical1. List of PCBs/VRs/LEDs/Check PinsVariable resistors, LEDs and check pins which are used for adjustments in the field are listedbelow.VRs and check pins not listed here are used only for factory adjustments which require specialtools and measuring instruments, as well as great care and precision. Do not attempt to adjust suchparts.Notes:1. Leakage current may flow through some LEDs and cause them to glow dimly even thoughthey are supposed to be OFF.2. VRs which can be adjusted in the field .................VRs which should not be adjusted in the field......a. DC Controller PCBFigure 10-223Table 10-203Table 10-204SW NoSW300PurposePress to enter or leave the service mode.VR NoVR301PurposeAdjusting AE reference pointJ308J323 J309 J310J312 J311 J313J307J301 J320J321 J319J306J305J304J303J324J302J316J315J314J318SW300VR301J317
