CHAPTER 11 TROUBLESHOOTINGCOPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-7318 The scanner fails to move forward.YES/NONONONONOYESNOCauseCableScanner pathCompositepowersupply PCBPre-registra-tion rollerpaper sensor(Q751)Scanner/lensdrive motor(M2)DC control-ler PCBStep12345ChecksIs the scanner drive cable routedcorrectly?Is the scanner rail soiled?Move the scanner by hand. Does itmove smoothly?Set the meter range to 30 VDC, andconnect the meter probes to J202-2 (+)and -1 (-) on the composite powersupply PCB. Is the meter readingabout 24 V?Is the pre-registration roller papersensor (Q751) normal? (For instruc-tions on how to check thephotointerrupers, see p. 11-51.)Replace the scanner/lens drive motor(M2). Is the problem corrected?ActionRoute the cablecorrectly.Check the surface ofthe scanner rail fordirt, foreign matter, orobject which mayinterfere.See "DC power fails toturn on."Check the wiring fromJ108 on the DCcontroller PCB toQ751; if normal,replace Q751.End.Replace the DCcontroller PCB.19 The registration roller fails to rotate.YES/NONONONOYESNOCauseMain motor(M1)Pre-registra-tion rollerpaper sensor(Q751)Registrationroller springclutchRegistrationclutchsolenoid(SL2)DC control-ler PCBStep1234ChecksDoes the main motor (M1) start torotate when the Copy Start key ispressed?Is the pre-registration roller papersensor (Q751) normal? (For instruc-tions on how to check thephotointerrupers, see p. 11-51.)Does the registration clutch solenoid(SL2) turn on for a moment after theCopy Start key is pressed?Set the meter range to 30 VDC. Doesthe voltage between J109-6 (+) and -5(-) on the DC controller PCB changeto about 24 V for a moment after theCopy Start key is pressed?ActionSee "The main motorfails to rotate."Check the wiring fromJ108 on the DCcontroller PCB toQ751; if normal,replace Q751.Check the position ofthe solenoid; if nor-mal, check or replacethe control ring.Check the wiring fromJ109 on the DCcontroller PCB to SL2;if normal, replace SL2.Replace the DCcontroller PCB.
