Factotum

asked Mar 13, 2012 at 6:27am
Hp HP DeskJet Plus

Quick fix for HP PSC 2400 carriage jam

Carriage jammed left on a HP PSC 2400 photosmart?.To avoid unnecessary dismantling,I first tried most the fixes mentioned on another thread.After several sucessful attempts of my own to free it by putting my finger around the back of the printhead, the carriage continued jamming, always to the left after power up.
Cause? -
A warning - be aware of dodgy webpages!! - I am fairly sure that my printer was damaged by printing a bad webpage!!. Initially on this webpage I used "print review" option on the righthand mouse click - and Internet explorer crashed and quit - I should have taken notice of this but I went ahead and printed the page anyway - and that is when the printhead went hard left with a bad grinding sound and caused the permanent Carriage Jam error.
The carriage has been driven too hard to the left and causes either the belt drive clip to disengage on the right handside (looking down) - as mentioned by others in this thread or - if you are unlucky, it has actually damaged the belt clip, causing the right hand side ( looking down) clip to split ( there are actually two small plastic clips on the printhead dive clip, on left and on right). If you are lucky and the clip is undamaged the belt drive can simply be pushed back into place. If you do this and it fails again shortly or immediately afterwards the drive belt clip on the righthandside is definitely damaged.
You can either buy a replacement clip-- or repair it using two "small" tywraps as described below if you feel capable / confident - the risk of damage to the printer of this repair is very low, if you are careful.

To fix do the following:
1) Remove the back paper jam panel
2) Remove the 2 silver torx head screws and remove the remaining rear panel whole.
3) on the lefthandside ( from rear) you will see three foil cables plugged into the control board. mark or sketch how they are placed for future reference. Remove these foils but leave the free ( coloured) wires plugged in
4) Carefully lift the copier lid out of its runners / hinges by pulling the top sides of the printer body outwards. Do not pull out too hard or too far as the coloured wires are still attached . There is enough length of the attached wire to allow the copier lid to be placed on a flatsurface behind the printer while you work on the main body.
5)Looking down on the printer body,Remove the top cover by first removing 4 black torx screws( front) plus the 2 sliver torx ( rear). Spring out sides and lift the retaining tabs ( middle top on both sides)and lift of the to cover -This is difficult to describe but it is obvious what to do!
6) You can now easily see what the problem is. Looking down behind the printhead you wil see the carriage drivebelt, it should be parrallel to the printhead. If it is jammed, you will see that the righthandside of the belt clip is jamming against the metal chassis of the printer preventing it from moving to the right.. By pushing on the righthandside it will clip back on and look parallel withthe printhead. If this action is "easy" to do then most likely the engagement clip is damaged on its righthandside. If it is hard to clip back into place you may be lucky and the clip is undamaged.

It is better to replace the dfrive belt clip if you do not feel the following is within your capabilities - bear in mind though that you will need to do 99\% of the following to replace the clip - and the repair described is stronger than the original flimsy clip. If, like me, you need the printer in service pronto then proceed with the following ;

7) To avoid damage to it, unclip the clear carriage position foil from its post on the lefthand. This is the foil that runs across the carriage and passes through the printhead. Clean the foil over its full length with some isopropyl alchohol. There is no need to disconnect the printhead connector foil.

8) Run the cariage drive belt of the motor spindle ( lefhandside) by simply running it over the edge of the motor's drive sprocket while turning it. There is no need to make any position reference for the belt - this is done automatically by the printers firmware

9) Remove the carriage rail by removing torx screws ( two sliver recessed in the rail , and one black torx on the extreme righthand end of the cariage rail)

10) Carefully lift together,the print head and carriage rail away from the printer - be aware that the right hand end of the carriage rail is recessed onto a plastic post

11) Remove the carriage rail from the printhead by sliding the printhead of the rail to one end. Clean the carriage bar.

12) The carriage slider is now free and attached to the drive belt clip . Unclip the belt clip from the slider and examine the two small clips on the belt clip - chances are the righthand clip is split and will not provide a very secure engagment for the belt

To repair the clip you need to make 2 small slots in the plastic body of the slider at positions behind the 2 rubber posts where the belt clips to the slider. These slots need to be big enough to allow a very small tywrap to be inserted. Make the slots by heating a small flat screwdriver blade and gently press it while hot into the very top corner where the plastic drops vertically behind the rubber post. What you are trying to achieve is a simple means to retain the belt clip to the slider using tywraps for both leftand right hand side clips. When you have made the slots insert the tywraps so that the ratchet end of the tywrap is positioned on the topside at its slot and the free end passes down and out forward in the direction of the belt clip. Now clip the belt clip back onto the slider and gently secure both tywraps around the belt clip - do not over tighten them - just sufficient to stop both left and right clips from disengaging, particularly the damaged righthand clip .

13) Place the repaired belt clip and slider assembly back inside the rear of the printhead making sure the slider faces down ( ie curved side down).Align it to allow the carriage bar to be inserted from one side of the printhead pass through the slider assembly and out the other side, so that the carriage bar slides freely through the complete assembly.Apply a little white lithium grease to the carriage bar

14) Make sure all the prinhead components are correctly positioned (ie drive belt , clear foil, connector foil), the plastic "pointer" above the printhead must sit UNDER the metal cross piece above and behind the carriage. lay the carriage bar above its position on the printer chassis - make sure the righthandside engages correctly on its post and then press the carriage bar into position and screw it down

14) Re assemble the printer in reverse order. Make sure that the carriage position ribbon passes correctly through the slot in black detector housing on the rear of the printhead carriage before clipping it back on its post.

15)When the printer is finally reassembled do an aligment and print a testpage etc.

This all sounds complicated - but its not too difficult - it took me about 3/4 hr to have a fully sound working printer. Apart from the tywrap fix, this is the work you would have to do anyway if fitting a new part the fix is mechanically stronger than those flimsy clips to.