HP — HP LaserJet 4V and 4MV Printer Service Guide, C3141 90929 English (EN)

List of Figures Figure 1-1 Sample Model and Serial Number Labels . . . . . . . . . . 1-5 Figure 1-2 Front and Rear Side View . . . . . . . . . . . . . . . . . . 1-11 Figure 1-3 Rear and Left Side View . . . . . . . . . . . . . . . . . . . 1-12 Figure 1-4 Front View with Front Cover Open . . . . . . . . . . . . . 1-13 Figure 1-5 Internal Assembly Locations (1 of 2) . . . . . . . . . . . . . 1-14 Figure 1-6 Internal Assembly Locations (2 of 2) . . . . . . . . . . . . . 1-15 Figure 1-7 Sample 5% Page Coverage . . . . . . . . . . . . . . . . . . 1-17 Figure 2-1 Printer Space Requirements . . . . . . . . . . . . . . . . . 2-4 Figure 3-1 Control Panel Layout . . . . . . . . . . . . . . . . . . . .

. 3-3 Figure 3-2 Service Mode Menus . . . . . . . . . . . . . . . . . . . . . 3-16 Figure 3-3 Self Test Printout (printed in Service Mode) . . . . . . . . 3-21 Figure 3-4 Engine Test . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22 Figure 5-1 Printer Functional Block Diagram . . . . . . . . . . . . . . 5-3 Figure 5-2 Power Supply/Power Distribution . . . . . . . . . . . . . . 5-4 Figure 5-3 Formatter PCA Block Diagram . . . . . . . . . . . . . . . 5-10 Figure 5-4 EconoMode vs Normal Mode . . . . . . . . . . . . . . . . . 5-12 Figure 5-5 Image Formation Block Diagram . . . . . . . . . . . . . . 5-17 Figure 5-6 Photosensitive Drum . . . . . . . . . . . . . . . . . . . . .

5-18 Figure 5-7 Drum Cleaning . . . . . . . . . . . . . . . . . . . . . . . . 5-19 Figure 5-8 Primary Charging Roller . . . . . . . . . . . . . . . . . . . 5-20 Figure 5-9 Image Writing . . . . . . . . . . . . . . . . . . . . . . . . . 5-21 Figure 5-10 Image Development . . . . . . . . . . . . . . . . . . . . . . 5-22 Figure 5-11 Image Transferring . . . . . . . . . . . . . . . . . . . . . . 5-23 Figure 5-12 Image Fusing . . . . . . . . . . . . . . . . . . . . . . . . . 5-24 Figure 5-13 Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25 Figure 5-14 Clutches and Sensors . . . . . . . . . . . . . . . . . . . . . 5-26 Figure 5-15 General Timing Diagram . . . . . . . . . . . . .

. . . . . . 5-29 Figure 6-1 Phillips vs. Posidriv Screwdrivers . . . . . . . . . . . . . . 6-4 Figure 6-2 Removing the Control Panel . . . . . . . . . . . . . . . . . 6-8 Figure 6-3 Upper Cover . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9 Figure 6-4 Static Charge Eliminator . . . . . . . . . . . . . . . . . . . 6-10 Figure 6-5 Removing Side Covers . . . . . . . . . . . . . . . . . . . . 6-11 Figure 6-6 Removing Rear Cover . . . . . . . . . . . . . . . . . . . . . 6-12 Figure 6-7 Exhaust Fan . . . . . . . . . . . . . . . . . . . . . . . . . 6-13 Figure 6-8 High Voltage Power Supply PCA . . . . . . . . . . . . . . 6-14 Figure 6-9 Cassette Size Sensor Assembly . . . . . . . . . . . .

. . . 6-15 Figure 6-10 Card Cage . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16 Figure 6-11 Rear Exhaust Fan . . . . . . . . . . . . . . . . . . . . . . 6-17 Figure 6-12 Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . 6-18 Figure 6-13 DC Controller PCA . . . . . . . . . . . . . . . . . . . . . . 6-19 Figure 6-14 Laser/Scanner Assembly . . . . . . . . . . . . . . . . . . . 6-20 Figure 6-15 Main Motor . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21 Figure 6-16 Main Drive Assembly Removal (1 of 2) . . . . . . . . . . . 6-22 iii