Text preview for : HP Deskjet 400 Disassembly.pdf part of HP Deskjet 400 HP Deskjet 400 disassembly guide
Back to : HP Deskjet 400 Disassembl | Home
4
Removal and Replacement
1. Back Case...................................................................................4-3 2. Main PCA....................................................................................4-4 3. Front Case ..................................................................................4-6 4. Access Door ...............................................................................4-8 5. Input Tray ...................................................................................4-9 6. Key Panel PCA .........................................................................4-10 7. Spittoon Foam .........................................................................4-11 8. Service Station Wipers and Caps...........................................4-12 Mechanism Removal and Replacement 9. Carriage Motor.......................................................................4-13 10. Encoder Strip and Carriage Belt .........................................4-15 11. Carriage ..................................................................................4-17 12. Pinch Plate .............................................................................4-19 13. Pressure Plate Lever, Pressure Plate and Service Station.......................................................................4-22 14. Output Roller Assembly, Platen Assembly, Paper Trough, Paper Size Adjustment Bracket and In-Pinch Rollers ......4-25 15. Feed Roller Assembly and Left Support Assembly...........4-27 16. Service Station Motor ...........................................................4-29
Thi d
t
t d ith F
M k
402
DeskJet 400 Hardware Training Guide Removal and Replacement
This manual numbers each removal and replacement procedure to help you easily locate procedures. For example, if a procedure requires you to first do another procedure given elsewhere in the manual the text may say, "First remove the front case, using removal procedure 1."
N O T E
The procedures in this chapter are removal procedures. To do the replacement procedure, reverse the removal procedure, unless stated otherwise.
Removal and Replacement Tools
· · · · · · · phillips screwdriver electrostatic grounding heel strap needle-nose pliers flat blade screwdriver #13 knitting needle feed roller spring compression tool E-clip applicator ETH-5 O-type
Before You Begin
Before starting a removal procedure, do the following: 1. Remove the print cartridge. You may place the print cartridge in a plastic bag to reduce the possibility of ink clogs in the nozzles and ink loss due to evaporation. 2. Turn off the printer and disconnect the power adapter. 3. Disconnect the interface cable.
C A U T I O N
Before working with the printer, be sure to wear electrostatic grounding heel straps to prevent damage to the electronic components.
4-2
DeskJet 400 Hardware Training Guide Removal and Replacement
1. Back Case
1. Be sure the clips on the Centronics plug do not block the case removal. Position them to stick straight out from the plug. 2. Push down on the top of the back case with the heel of your hand and move it towards the back.
3. This should release the five catches holding the back case to the front case, and the back case will pop off.
Replacement: Be sure the Centronics connector cover plate is attached to the mechanism and that the Centronics connector cover plate slides into the slot in the back case.
4-3
DeskJet 400 Hardware Training Guide Removal and Replacement
2. Main PCA
Tool required: Phillips screwdriver.
1. First remove the back case, removal procedure 1. 2. Push the Centronics connector cover plate in towards the Centronics connector and pry it up and out of the notch in the chassis.
3. Remove the six connectors to the Main PCA.
4. Pull up on both ends of the two clamps holding in the two flat cables.
4-4
DeskJet 400 Hardware Training Guide Removal and Replacement
5. Remove the two flat cables.
6. Unscrew the five screws holding the Main PCA to the chassis. The PCA will come off when you remove the last screw.
4-5
DeskJet 400 Hardware Training Guide Removal and Replacement
3. Front Case
Tools required: Flat blade screwdriver.
1. First remove the back case, removal procedure 1. 2. If you have not removed the Main PCA, disconnect the key panel connector from the Main PCA.
3. To release the catches at the bottom sides of the front case, pull out and up on each left and right side.
4. To release the two catches at the top of the front case, push back and pull up on each left and right side of the front case.
4-6
DeskJet 400 Hardware Training Guide Removal and Replacement
5. To release the tab at the bottom of the front case from the slot in the printer's base, pry up on the tab with a flat blade screwdriver.
6. Be sure the envelope lever is down and does not block removal. Lift the front case away from the mechanism.
4-7
DeskJet 400 Hardware Training Guide Removal and Replacement
4. Access Door
1. With the front case on the printer, open the access door. 2. Hold the access door by its sides and push down with your thumbs on the printer's front cover. The access door pops off.
4-8
DeskJet 400 Hardware Training Guide Removal and Replacement
5. Input Tray
1. First remove the back case, access door and front case, removal procedures 1, 4 and 3. 2. Stand the front case on its left side, with the input tray open at a 90 degree angle.
3. Push down on the side of the input tray with one hand and twist up and back on the side of the front case with the other hand.
4. When the front case pin is clear of the slot in the input tray, remove the input tray by pulling it to the side.
4-9
DeskJet 400 Hardware Training Guide Removal and Replacement
6. Key Panel PCA
1. First remove the back case and front case, removal procedures 1, and 3. 2. Lay down the front case with its front side down.
3. Release the catch on one side of the key panel PCA with the fingernail of one hand and pull that side slightly up with the thumb and forefinger of the other hand.
4. Repeat step 3 for the catch on the other side of the key panel PCA. Pull the key panel PCA up and out of the front case.
4-10
DeskJet 400 Hardware Training Guide Removal and Replacement
7. Spittoon Foam
Tools required: Needle-nose pliers and flat blade screwdriver.
1. To remove the spittoon foam without removing the front case, open the printer access door and move the print cartridge carriage to the left. 2. If the print cartridge carriage is locked in the service station, use a flat blade screwdriver to turn the service station gear through the slot in the printer's base. Turn the gear until it unlocks the carriage. (See note below.)
3. You can use the needle-nose pliers to pull the spittoon foam out of the spittoon.
N O T E
Be careful not to damage the plastic service station gear with the screwdriver.
4-11
DeskJet 400 Hardware Training Guide Removal and Replacement
8. Service Station Wipers and Caps
Tools required: Needle-nose pliers and flat blade screwdriver.
1. First remove the back case and front case, removal procedures 1, and 3. 2. If the service station is locked in position, use a flat blade screwdriver to unlock it, by rotating the service station gear through the slot in the bottom of the printer. (See note on previous page.)
3. With the service station unlocked, rotate it with your finger until the wiper or cap shows.
4. Remove a wiper or cap by pulling up with the needlenose pliers.
Replacement: When replacing wipers or caps, be sure the service station is correctly aligned, see the first "Solution" in the table on page 2-18. When replacing the color cap, be sure the beveled edge is up to ensure correct cartridge sealing.
4-12
DeskJet 400 Hardware Training Guide Removal and Replacement
Mechanism Removal and Replacement 9. Carriage Motor
Tool required: Phillips screwdriver.
1. First remove the back case and front case, removal procedures 1, and 3. 2. Remove the two connectors for the carriage and paper motors from the Main PCA.
3. Remove the carriage and paper motor wires from the wire holders on the chassis.
4. Untwist the carriage motor wires from the paper motor wires.
4-13
DeskJet 400 Hardware Training Guide Removal and Replacement
5. Use the Phillips screwdriver to unscrew the two screws holding the carriage motor.
6. Unhook the carriage motor bracket and remove the motor from the chassis.
4-14
DeskJet 400 Hardware Training Guide Removal and Replacement
10. Encoder Strip and Carriage Belt
Tool required: Flat blade screwdriver.
1. First remove the back case, front case, and carriage motor, removal procedures 1, 3 and 9. 2. Press on the left end of the upper carriage rod to release the pressure on the E-clip; then remove the E-clip with the flat blade screwdriver.
3. Slide out the upper carriage rod to the left. Be sure to save the wave washer at the right end of the rod.
4. Remove the left end of the encoder strip from the encoder spring.
4-15
DeskJet 400 Hardware Training Guide Removal and Replacement
5. Turn the encoder strip to remove it from the hook on the right side of the printer.
6. With the flat blade screwdriver, remove the E-clip from the left end of the lower carriage rod.
7. Push on the right end of the lower carriage rod and free the carriage rod.
8. Remove the carriage belt from the carriage.
Replacement: Whenever you remove and replace a carriage belt, you must adjust the pen to paper spacing. To do the pen to paper spacing adjustment, you must centre the lower carriage rod bushings before replacing the lower carriage rod. See chapter 5, Calibrations. When replacing the upper carriage rod, be sure to first move the carriage to the far left. This allows the rod to immediately slide into the carriage and prevents grease on the rod from contaminating the encoder strip.
4-16
DeskJet 400 Hardware Training Guide Removal and Replacement
11. Carriage
1. First remove the back case, Main PCA, front case, carriage motor, and carriage belt, removal procedures 1, 2, 3, 9 and 10. 2. Unhook the clip holding the back flex cable holder to the chassis.
3. Remove the flex cable from the back flex cable holder.
4. Unhook the clip holding the front flex cable holder to the chassis.
4-17
Thi d t t d ith F M k 402
DeskJet 400 Hardware Training Guide Removal and Replacement
5. Remove the sleeve and bushing from the left end of the carriage rod.
6. Slide the carriage to the left off the lower carriage rod.
4-18
DeskJet 400 Hardware Training Guide Removal and Replacement
12. Pinch Plate
Tool required: Phillips screwdriver.
1. First remove the back case, Main PCA, and front case, removal procedures 1, 2, and 3. 2. Remove the carriage motor and paper motor wires from the wire holders on the chassis.
3. Untwist the carriage motor wires from the paper motor wires.
4. Remove the service station and OOPS flag wires from the wire holders on the back of the chassis.
4-19
DeskJet 400 Hardware Training Guide Removal and Replacement
5. Unscrew the five screws holding the base to the chassis and remove the base.
6. From the back, unscrew the four self-taping screws holding the print zone to the chassis.
7. From the front, unscrew the four machine screws holding the print zone to the chassis, and remove the print zone from the chassis.
8. Unhook the pinch plate springs from the hooks on the chassis.
4-20
DeskJet 400 Hardware Training Guide Removal and Replacement
9. Slide the pinch plate rod to the left, until the right side of the pinch plate comes loose.
10.Slide the pinch plate rod to the right and remove the pinch plate.
Replacement: When replacing the pinch plate, do not hook the pinch plate springs to their hooks on the chassis until after replacing the print zone. When you do hook on the pinch plate springs, use a #13 knitting needle to more easily hook the springs onto their hooks on the chassis.
4-21
DeskJet 400 Hardware Training Guide Removal and Replacement
13. Pressure Plate Lever, Pressure Plate, and Service Station
Tool required: Phillips screwdriver.
1. First remove the back case, Main PCA, and front case, removal procedures 1, 2, and 3. 2. Remove the carriage motor and paper motor wires from the wire holders on the chassis.
3. Untwist the carriage motor wires from the paper motor wires.
4. Remove the service station and OOPS flag wires from the wire holders on the back of the chassis.
4-22
DeskJet 400 Hardware Training Guide Removal and Replacement
5. Unscrew the five screws holding the base to the chassis and remove the base.
6. From the back, unscrew the four self-taping screws holding the print zone to the chassis.
7. From the front, unscrew the four machine screws holding the print zone to the chassis, and remove the print zone from the chassis.
8. Remove the loose pressure plate and pressure plate lever.
4-23
DeskJet 400 Hardware Training Guide Removal and Replacement
9. Untwist the service station wires from the OOPS wires and remove the service station to the right.
Replacement: When replacing the base: 1. Remove the paper adjust lever from the base. 2. Use tweezers to hold back the paper size adjustment bracket spring while you push the lever into the clip on the paper size adjustment bracket, as shown in the figure below:
3. With the lever in place, fit the base on to the lever and the chassis; then screw the base to the chassis. Be sure the hook on the base fits into the hook on the pressure plate. The pressure plate should be free to move and will rattle when you shake the mechanism.
4-24
DeskJet 400 Hardware Training Guide Removal and Replacement
14. Output Roller Assembly, Platen Assembly, Paper Trough, Paper Size Adjustment Bracket, and Pinch Rollers
Tool required: Phillips screwdriver and flat blade screwdriver.
1. First remove the back case, Main PCA, front case, and service station, removal procedures 1, 2, 3, and 13. 2. Use a Phillips screwdriver to unscrew and remove the paper size adjustment bracket spring and spring holder from the left support assembly.
3. With the paper size adjustment bracket to the right, pry out the clip with the flat blade screwdriver and lift out the output roller assembly.
4. Remove the platen assembly and the paper trough from the left support assembly.
4-25
DeskJet 400 Hardware Training Guide Removal and Replacement
5. Remove the paper size adjustment bracket.
6. Lift the in-pinch rollers from the paper trough.
4-26
DeskJet 400 Hardware Training Guide Removal and Replacement
15. Feed Roller Assembly and Left Support Assembly
Tool required: Flat blade screwdriver.
1. First remove the back case, Main PCA, front case, service station, and output roller assembly..., removal procedures 1, 2, 3, 13, and 14. 2. Pull out the bushing to the right.
3. Bend the left wall of the left support assembly to the left with the flat blade screwdriver to release the feed roller assembly.
4. Pull the feed roller assembly up and out of the left support assembly.
4-27
DeskJet 400 Hardware Training Guide Removal and Replacement Replacement of Feed Roller Assembly
Tool required: Feed Roller spring compression tool.
1. Compress the feed roller spring with the feed roller spring compression tool. 2. Pull back the pivot lever of the left support assembly and position the feed roller assembly under it.
3. Ensure the washer on the feed roller assembly is to the left of the transmission plate; then push the feed roller assembly down into the left support assembly.
4. Pull out the feed roller spring compression tool; then push the bushing on the feed roller assembly to the left into the left support assembly.
4-28
DeskJet 400 Hardware Training Guide Removal and Replacement
16. Service Station Motor
Tool required: Phillips screwdriver.
1. First remove the back case, Main PCA, front case, and service station, removal procedures 1, 2, 3, and 13. 2. Unscrew the two screws holding the service station motor to the service station assembly.
3. Slide out the service station motor from the slot in the service station assembly.
4-29
DeskJet 400 Hardware Training Guide Removal and Replacement
4-30