F. Variable Resistors (VR) and Check Pins by PCBOf all the VRs and check pins found in the copier, those that are needed in the fieldare discussed.Caution:Do not touch the VRs and check pins that are not discussed herein; they are forfactory adjustment only and require special tools and instruments and must beadjusted with high precision.1. DC controller PCBFigure 10-60610-92 COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 10 TROUBLESHOOTING3 J311 1 2 J309 20 1 J310 1511 J303 115 J306 67 J307 6 10 J308 1 12 J304 1 1 J305 61 J314 121 J315 7J3161 2J317 111J322J3128315 J302 15 J318 11J35621J3244B10 J319 B1A1 A101 J301 611 J313 11J3203SW303 512J3511J353SW3021 71J3214VR302VR301VR391