40718301TH Rev.6 101 /1-1• Take the measurement of the following voltage readings at connector CN2 on the power supply/sensor board:Voltage between Pins 1 and 3: ... about 40 V ACVoltage between Pins 5 and 6: ... about 9.2 V ACAre the voltages within the normal range?• Yes Is fuse F3 on the power supply/sensor board blown?• No Replace the power supply/sensor board.• Yes Replace fuse F3 (if it blows again, check the resistance of the registration and main/drum motors. If it is faulty, replace motors or replace the power supply/sensor board ormain control board).• No Is the AC input voltage output between Pins 1 and 2 of connector CN1 on the powersupply/sensor board normal?• Yes Replace the AC transformer.• No Is fuse F1 or F2 on the power supply/sensor board blown?• No Replace the power supply/sensor board.• Yes Replace blown fuse F1 or F2 (if is blows again, replace the power supply/sensor board).ACINFilterCircuitCN1 CN2Power supply/sensor boardF1LNFGF2 12F31, 23, 4+30 VSmoothingCircuit+5 VStabilizingCircuit+30 V+5 V0 VCN36 ±8 Rectifying/SmootingCircuit5+8 V-8 VAC TransformerFuse Ratings120 V 230 VF3AC InputFuse17, 18129, 15, 162422Thermal FuseF2F1125 V 3.15A125 V 1.6 A125 V 6.3 A250 V 2.5A–250 V 5 AFigure 6-1 Low-voltage Power Supply Block Diagram
