Question about HP Photosmart 7450 InkJet Printer
My HP Photosmart 7450 printer suddendly stopped feeding paper. A close inspection revealed that the long shaft the paper drive rollers were mounted on did not turn when it was attempting to feed paper. The motor would run and the large black gear would turn, but the shaft would not.
While inspecting the unit I noted a rattle, turned it upside down on a clean workbench, and a small 1/16" diameter x 5/16" long stainless steel pin fell out.
Great, that's probably the problem. BUT,,, I can't get the top cover off.
Three screws holding down three of the corners are plainly evident, but the fourth corner, the left front, is secured by something else, probably a plastic clip. I have looked inside with an inspection mirror and cannot locate the hold down element. Tried all along the joints with a small screwdriver trying to release a hidden tab. No luck.
Hope it's not one of those once you snap it together, you must destroy it to get it apart, locking tabs some manufacturers use to tamper proof their products.
HP was their usual, helpful selves. After about an hour of explaining my problem several times they simply said "No user servicable items inside".
A link to a service manual would be helpful also.
The unit is rarely used, so this is not a worn out parts issue.
I just need to fix it. Any help would be sincerely appreciated. ---- Thanks
I had the same problem with my HP photosmart 7450. It started with frequent paper jams, to the point where it happened everytime it pulled the paper in to print. I had the rattle also, turned it upside down and the pin fell out, just like yours. I'll bet it's happening to many other 7450's. Anyway, I was able to repair it myself.
The pin attaches to a small black plastic gear, about 1/2 in. in diameter, in the paper feed roller, (on the right side, and not visable from the front). I had to remove the misc. covers, several screws attaching different things, includind the sliding ink absorber on the right side, (that was fun) to where I could see the loose gear. This was no easy task. I'm an auto mechanic, so I enjoy a challenge. However, as much as I like the printer, I was ready to toss it in the dumpster if I couldn't figure it out. First you'll need a small "torx" screwdriver or two, as well as some other basic tools. If you're patient, good with your hands and have a good sense of how things work, you can probably repair it yourself also. Let me know if you're successful.
Good luck!.....Ron J........ firstname.lastname@example.org
Posted on Mar 17, 2008
Here are my findings of the way in to my HP7450. The start (up to removing the small grey (I found black) strip follows Ron J's instructions, and I am most grateful to him, because that gave me the start I needed.. But when I got the strip off, I found a single screw, and removing it did not give final access to the innards Read on.....
It may make life more convenient to unclip the two hinges and remove the top grey cover. Slide firmly downwards and forwards.
Unscrew the first three Torxx screws (size #10). Two are at the rear of the case, and the third is at the bottom of the well where the spare ink cartridge goes.
All of the subsequent operations refer to the section of the printer to the left of the top door.
Release the black plastic plate (roughly 10 ´ 120mm) that looks like trim in the middle of the left-hand section. Slide (maybe lever gently) from the left: it is fixed by a lipped holder on the left and a spring clip on the right, and it is this latter clip you are trying to push against.
With the black trim off, a small Torxx screw is exposed, which is smaller than the three removed so far. Undo it.
The next item to be removed is the grey cover. It can come off with the black left-hand side panel still attached. It is held by two small spring catches. The locating holes for these are found in the black section normally covered by the upper door. One of the clip holes is below the grey panel at the top, and the other is towards the bottom of the panel: both holes are, of course, on the vertical faces of the black frame.
Both clips must be pressed in at the same time, and the grey panel will then slide forward and can be removed. The upper printed circuit board (PCB) and electronics are now exposed.
The PCB can be partially freed by lifting the two black clips at the top front. Gently ease the PCB forward. (CAUTION: be careful not to damage any wiring or electronics, and remember that the components may be destroyed by inadvertent static charges). When this operation is completed, a fourth Torxx #10 screw can now be found in a recess towards the right of this section. Remove it.
The whole of the upper box assembly is now held by just one further plastic clip exposed by moving the PCB. Release the clip and lift the assembly a SMALL distance. There is a multiway strip cable connecting the electronics in the top with the electronics in the bottom. GENTLY pull the connector at the end of the cale out of the socket on the PCB in the lower section, and remember which way round it was for reassembly.
Now you have the various bits of the HP 7450 separated for the next stages of work!
I hope that this helps someone, but Ron J deserves the credit.
Posted on Sep 13, 2008
I have the exact same problem, and cannot find a way to get the front left of the cover loose.
Posted on Mar 06, 2008
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Posted on Jan 02, 2017
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