Xerox Phaser 3117 Service Manual

Also see for 3117 - Phaser B/W Laser Printer: Upgrade instructions Specifications User guide

Contents

Xerox Phaser 3117 Service Manual Manual pdf 124 page image

Circuit DescriptionxService Manual 12-1121212. Circuit Description12.1 Engine ControllerThe engine controller module consists of a motor controller, a PWM controller, a LSU I/F controller, and an ADC I/Fcontroller.12.1.1 Heater ControlThe heat lamp radiates heat by using AC power. The AC power is a TRIAC (a semiconductor switch device) whichcontrols a switch. The ‘ON/OFF’ control is completed by turning on/off a gate of the TRIAC through a photo TRIACwhich is insulation part.If explaining more detail about the AC control part, it consists of passive circuit ; therefore, it turns on/off the heaterby receiving the signal from the engine control part. If the heater on signal is turned on at the engine, electricity flowsin as the LED of the PC1 (Photo TRIAC) is connected. Then, it emits light.By this light, the TRIAC unit, a light receiving unit, becomes on, and electricity is supplied to the gate of the TRIAC.Then, the TRIAC is turned on. As a result, AC current flows in a heat lamp, and the heat lamp radiates heat.On the other contrary, if the signal is turned off, the PC1 becomes off, and the TRIAC is turned off due to no elec-tricity at the gate of the TRIAC. Consequently, the heat lamp is turned off.Special Feature of TRIAC (THY 1): 16A, 600V SWITCHINGPhototriac Coupler (PC3)Turn On If Current: 15mA~50mA (Design: 16mA)High Repeive Peak Off State Voltage: Min 600VVccVccVccR3C21nFR1ER55.6KTR2 KSC1008-YR4BD1RsCTR1KSC1008-YBD23C110nF BTHERMISTORCN1D1914T1D2914T1IC1LM393DR65.6KR71KR2D3914T12112ECBHEATLAMPNHPC1CHOKEC22103R24120R22 180FUSIBLER23100C21104TRIACR211.5KENGINE CONTROL PART AC CONTROL PARTACVOLTAGE12126 4FUSERTHERM+24Vs