HP LaserJet 4v/mv Service Manual - Page 66
Power Supply System
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Power Supply System The AC and DC power supply circuits are contained on the Power Supply Unit, and the high voltage power circuitry is contained on the High Voltage Power Supply PCA. The Power Supply and Distribution System is illustrated in Figure 5-2. 5BLKDIA Power Supply Unit Circuit Breaker CB101 Noise Filter Power Switch (SW101) Filter Fuse (F101) Front Door Switch (SW102) Fusing Heater Drive Circuit Switching Transistor Transformer Rectifier Control IC Photocoupler 24V to 5V Front Door Switch (SW102) Overcurrent Protection +24V +5V /RELE /FUSE1ON /FUSE2ON +24V Fuser Heater +24V +5V Laser / Scanner Unit +12V +24V +5V /RELE /FUSE1ON /FUSE2ON +24V DC Controller Exhaust Fans +24V (High Spd.) FM1 +5V (Low Spd.) +24V (High Spd.) FM2 +5V (Low Spd.) Intake Fan FM3 +5V (Low Spd.) +5V +24V +24V +5V +24V +5V High Voltage Power Supply Main Motor (M1) +5V Front Door Assembly +24V Interface PCA Primary Charging Roller Developing Bias Transfer Charging Roller Toner Sensor Sensors, Clutches, Solenoids Control Panel Formatter PCA Figure 5-2 Power Supply/Power Distribution 5-4 Functional Overview