Canon NP6012 Service Manual

Also see for NP6012: Service manual

SLES SS) OP ERATIONS AND TIMINGE. Main Motor Control Circuit1. OutlineFigure 3-107 shows the circuit that con-trols the main motor (M1); the circuit has thefollowing functions:@ turns on and off the main motor.@ _ controls the rotation of the main motor toa specific revolution.The main motor (M1) is a DC motor witha built-in clock pulse generator. When themotor rotates, clock pulse signals (MMCLK)are generated according to the revolution ofthe motor. The speed control circuit matchesthe phases of the frequency of these clockpulses and the frequency of the referencesignal to control the rotation of the mainmotor (M1) to a specific revolution.jaf 2ev ajComposite | |i power + |supply ba:20V 4| !|| y20s gor!||||||||_||||||PLL controldrive circuit203] || js109-6 "7 2 MMD 5)| ‘ ’j bgS_wz0eal i mock sl |Reference signal2. OperationWhen the main motor drive signal(MMD) from the DC controller circuit goes“{’, the drive circuit of the motor driver turnson, thereby rotating the main motor (M1) at aspecific revolution.While the main motor is rotating at aspecific revolution, the main motor driverPCB sends the speed state signal(MLOCK=0) to the DC controller PCB. If, forsome reason, fluctuations occur in the rota-tion of the main motor, the MLOCK signalgoes ‘1’,If MLOCK=1 continues about 1 secwhile the main motor drive signal (MMD) is‘1’, the DC controller identifies an error in themain motor, stops the main motor and, at thesame time, indicates ‘E010’ on the display.Clock pulsegeneratorDrivecurrent M1___ Hall IC outputMMCLKHOH= fe:|||||||||||Main motor driver PCB jFigure 3-107COPYRIGHT © 1995 CANONINC. CANON NP6O12/NP6O12F/NPG212 REV.1 SEPT. 1995 PRINTED INJAPAN (IMPRIME AU JAPON) 3-7