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 td ith F Mk 402
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Transcript
4
Removal and Replacement
1. Back Case...................................................................................4-3
2. Main PCA....................................................................................4-4
3. Front Case..................................................................................4-6
4. Access Door ...............................................................................4-8
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 4 0 2
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-2
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 EN 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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-3
1. Back Case
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
.
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-4
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-5
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-6
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-7
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-8
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-9
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-10
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-11
7. Spittoon Foam
Tools required:
Needle-nose pliers and flat blade screwdriver.
N O T EN O T E
Be careful not to damage the plastic service station gear with the 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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-12
8. Service Station Wipers and Caps
Tools required:
Needle-nose pliers and flat blade screwdriver.
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.
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 needle-nose pliers.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-13
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-14
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-15
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.
DeskJet 400 Hardware Training GuideRemoval and Replacement
4-16
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.
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-17
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.
Thi d t t d ith F M k 4 0 2
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-18
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-19
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-20
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
.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-21
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.
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-22
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-23
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-24
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.
9. Untwist the service station wires from the OOPS wires and remove the
service station
to the right.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-25
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-26
5. Remove the
paper size adjustment bracket.
6. Lift the
in-pinch rollers
from the
paper trough.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-27
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-28
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.
DeskJet 400 Hardware Training Guide
Removal and Replacement
4-29
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