HP 4 Plus Manual
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Main Motor Assembly Removal 1Remove the Right Side Cover, Top Cover, and the Formatter Cage Assembly. 2Unplug the Main Motor connector from the Main Motor Assembly (see Figure 6-30, callout 1). 3Remove the (4) Main Motor screws (see Figure 6-30, callout 2). 4Remove the Main Motor. Figure 1-30 Main Motor Assembly 6-37 Removal and Replacement
Gear Assembly Removal 1Remove the Top Cover, the Right Side Cover, the Fuser Assembly, and the Formatter Assembly. 2Remove the Main Motor Assembly (see Figure 6-30). 3Remove the (2) screws that hold the Gear Assembly (see Figure 6-31 callout 1). 4Slide the Gear Assembly from the rear of the printer. Note Before tightening down the mounting screws, be sure the shoulder around the upper left mounting screw hole on the gear assembly protrudes through the frame. Figure 1-31 Gear Assembly Screws (Located behind Main Motor) 6-38 Removal and Replacement
Fan Removal NoteNote the cable routing before beginning this disassembly procedure. Be careful not to damage the cables during re-assembly. 1Remove the Right Side Cover, the Top Cover, and the Formatter Cage Assembly. 2Unplug the fan connector (J209 on the LaserJet 4, J211 on the LaserJet 4+/5). (See Figure 6-32, callout 1 .) (continued on next page) Figure 1-32 Fan Connector 6-39 Removal and Replacement
3Remove the RFI shield (LJ 4 only) by releasing the retaining tab and sliding the shield up (see Figure 6-33, callout 1). 4Laser Jet 4: Release the (4) clips from the fan ducting to provide clearance and remove the fan from the top of the printer (see Figure 6-33, callout 2). Laser Jet 4 Plus/5: Remove (1) screw on the right-rear and release the tabs on the lower left adjacent to the Output Paper Assembly 5Remove the fan. Note When reinstalling the fan, verify that the air is blowing upward. Figure 1-33 Exhaust Fan Removal (Laser Jet 4 shown) 6-40 Removal and Replacement
Output Assembly Removal 1Remove the Right Side Cover, the Top Cover, and the Left Side Cover. 2Release the grounding strap from the left side of the frame. 3Rotate the top of the Output Assembly toward the front of the printer while releasing the two retaining latches (see Figure 6-34, callout 1) until the locating tabs are free. Slide the assembly to the rear and lift it out of the printer. Figure 1-34 Output Assembly Removal 6-41 Removal and Replacement
Paper Exit Sensor (PS3) Removal 1Remove the Right Cover, Top Cover, and the Output Assembly. 2Disconnect the Sensor Cable. 3Lift the Sensor Retaining Latch and slide the sensor forward (see Figure 6-35). 4Remove the Paper Exit Sensor. Figure 1-35 Exit Sensor 6-42 Removal and Replacement
Scanner Assembly Removal 1Remove the Right Side Cover, Top Cover, Left Side Cover, and the Output Assembly. 2Remove all cables from the Scanner retaining clips. 3Remove the (3) connectors (see Figure 6-36, callout 2). Note Be careful not to flex the Laser PCA when removing or installing the cables. The Laser PCA can be damaged easily. 4Remove the (4) screws from the Scanner Assembly. (see Figure 6-36, callout 1). 5Remove the Scanner Assembly. Note When installing the Laser/Scanner Assembly, check that the Laser Shutter closes when the Toner Cartridge is removed. Figure 1-36 Scanner Assembly Removal 6-43 Removal and Replacement
Lower Cassette Assemblies The field-replaceable assemblies of the Lower Cassette are: •Lower Cassette Sensor PCA Assembly •Lower Cassette Pickup Motor Assembly Lower Cassette Sensor PCA Removal 1Release the Sensor PCA cover latches (see Figure 6-37 callout 1). 2Cut the tie-wrap and remove the (3) sensor connectors (see Figure 6-37 callout 2). 3Release the catch at the bottom rear of the Sensor PCA. (Use a slender object like a flat-blade screwdriver.) 4Remove the Sensor PCA. Figure 1-37 Lower Cassette Sensor PCA Latches and Connectors 6-44 Removal and Replacement
Lower Cassette Pickup Motor Removal 1Open the sensor cover and disconnect the center and rear connectors (see Figure 6-37, callout 2). 2Release the (2) tabs that hold the Upper Front Cover (access the tabs through the slots with a small screwdriver - see Figure 6-38 callout 1). Remove the cover by rotating it toward the front. 3Remove the (2) screws from the front and rear left side (see Figure 6-38 callout 2). 4Remove the cables from the race channel at the front of the Lower Cassette Base (see Figure 6-37). Note Note how the cables are routed in the the cable race. Be careful not to damage the cables during reassembly. (continued on next page) Figure 1-38 Lower Cassette Upper Front Cover 6-45 Removal and Replacement
5Lift the motor assembly straight up out of the the Lower Cassette Base (see Figure 6-39). NoteNote the ground connector underneath the Motor Assembly. Be careful not to damage this connector during reassembly. Figure 1-39 Lower Cassette Motor 6-46 Removal and Replacement