D-I-Y Repair Assistance Guide
HP 7100 Series Officejet Printers







Last Update: 5/09/2010
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Scanner Disassembly

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tools required

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Needed for disassembly are:
1. A cup or dish to hold screws or small parts
2. A small flathead screwdriver
4. A #10 torx-head wrench and / or
5. A long #10 torx-head wrench
(you can get a torx-head wrench assortment similar to the one shown here at most hardware stores for under $5.00)

NOTE: Be sure not to confuse TORX with a HEX / ALLEN wrench. Hex or Allen wrenches / fittings have six flat sides; TORX wrenches / fittings are 6-pointed, and sometimes referred to as 'star' wrenches / fittings.



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1. Pull the latches up, unplug & remove the ADF lid.



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2. Raise the scanner bed as you would for cartridge maintenance, then disconnect the hinged stays from the base.



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3. With the scanner bed now raised fully upright, 90°from base, remove the maintenance door fascia (face piece between the stays with the finger pull) by tipping tabs 'A' outward and sliding the fascia 'B' away from the base of the scanner bed.



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4. With fascia removed, you can now see some narrow openings which go up behind the control panel. We are interested in the 2 center openings marked here by red dots.



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5. In one of the 2 slots, there will be a screw at the bottom which needs to be removed. Be careful of the wire bundle which passes through this area. You will need a flashlight and a long #10 torx head wrench to reach this screw.



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6. Next, remove the 3 screws on the bottom marked here by red dots.
Keeping hinged stays flat against bottom of scanner, as shown here, lower the scanner bed down for access to the top.



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7. Using a thumbnail or carefully with a screwdriver, begin to release the control panel fascia from the bottom, then tip upwards and out to remove. The button assembly will remain in place although it slides around as if loose.



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8. From the top of the scanner, now remove the 4 screws marked here; 2 at back corners and 2 in the lid hinge recesses. Next, lift and tilt the scanner bed top to remove it.



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9. The scanner head will be in it's home position on the far right, covering the motor. Do not try to grab the head and slide it, and most of all DO NOT touch or wipe the bulb or surrounding area (all the white surfaces)!!



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10. Underneath the back scanner head rail you will see a blue rubber belt which loops on a roller. Pinch the belt on the side nearest you and gently pull towards the scanner head, to the right. As you do this you will hear a clicking sound that will concern you, but don't worry; you're not tearing anything up. You will also see the scanner head begin to travel to the center of the bed. Continue to pull using the belt until the scanner head has cleared the motor area.



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11. This is the motor arrangement below the scanner head. On the end of the motor nearest you is a calibrated disc which passes through a reading head (small black cube); this is the component which tells the system the current position of the scanning head.



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12. If for any reason you need to move the scanning head to right, back towards it's home position, do so as shown here; pressing firmly & evenly on the side of the scanning head. Again you will hear clicks, but not as loud as before. NOTE: Moving the scanner head back to home position manually is not necessary to close and re-start the machine; the scanner head will automatically cycle and restore it's position when first powered on.


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opening the scanning head
This next section shows you how to open the scanning head itself for cleaning or lamp replacement. Under most circumstances, cleaning inside the scanning head is not needed, however if the printer has been operating in smoking or dusty areas this may be more necessary. While working in this area remember at all times that touching the lamps should be avoided at all costs! Any body oil from fingers left on lamps will cause them to fail. Also take care to keep the lamp areas free of lint / fibers from cleaning. "Canned Air" or a turkey baster can be used to blow dust / lint out of the area when work is finished.



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13. Just outboard of the 2 black clamps at either end of the scanning head, marked here by red dots, gently slide a knife blade or similar straight downward about 3/8" between the aluminum lamp case and the black plastic housing.


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14. Carefully tilt the blade over top of the lamp case at each point just enough that the scanner access panel begins to lift.



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15. You can now rotate the access panel up and away from the lamps, and set it aside.


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16. At the front side of the printer lift the scanning head, rotating it up on the guide rail at the back. Lift only high enough to access the end of the scanning head.



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17. Beginning with the lowest point, slide the 2 white lamp wires out of the guide notches shown here by red dots.


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18. Holding first by the wires, and then the aluminum case, you can now lift the scanning bulb up on the front end enough to clear the scanning head body.



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19. Gently slide the bulb assembly towards the front of the machine to release the back end. Carefully set the bulb to the side.


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20. If absolutely necessary, or for lamp replacement, the same procedure can be used to remove the front bulb once you have removed the clear plastic end cap, attached by the single phillips head screw shown at the red dot.



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21. You now have access to all mirror surfaces, marked here with red dots. Note that there is one long mirror surface tucked up under the front lamp assembly, and that the long center mirror is mirrored on both faces.



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22. Mirror surfaces can be easily cleaned using a q-tip dampened with isopropyl alcohol.


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