Step 1 Remove the computer's side panel. Lay the computer on its side so the panel faces up. Push the cover release latch at the back of the computer's case. The cover should pop off and away from the computer. Make sure the computer is on its side before you begin replacing any parts. Dell Precision T3500 Manual Online: Removing The Cover. Follow the procedures in Before Working Inside Your 2. Pull the cover release latch toward the.
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Learning has never been so easy!
There are expensive causes of this error and I recently found there is a cheap cause of this error. This how to covers how to determine if the drive belt has simply slipped off or if more pricey hardware electronics have failed. It will also provide guidance on reseating the belt. I have not compared other units but any of the current Designjet Plotter with the scanner mounted in the lid likely have the same drive mechanism and therefore may have this problem which is easy to fix.
6 Steps totalStep 1: Remove the right cover
Any Left/Right/Front/Back instructions assume you are standing in front of the plotter. Open the scanner cover lid and on the right side remove three T-10 screws, (1) and then remove one screw from the side of the panel (2).
Step 2: Scanner motor cover
There is a plastic box underneath the panel you just removed with 3 T-10 screws holding it on, remove this panel and it will expose the entire scanner drive.
Step 3: Check the belt
Look down from on top and check that the belt is seated over all pulleys and the pulleys are aligned. The screw in the picture (1) had fallen out and allowed the pulley to move out and then the belt fell off. If your belt is not seated follow the rest of the steps. At this point a second set of hands is useful to hold the belt tension pulley out of the way. It can be done solo, just a little frustrating. This picture was taken with everything seated the way it should be. So if your belt is around all the pulleys and that screw has not come out, you have bigger problems than this How-To deals with.
Step 4: Accessing the screw for the shaft gear
To access the shaft gear to reinsert the screw you need to get some slack in the black and grey cable. We need enough slack that you can move the round ferrite out of the say as it blocks the use of any screwdriver. The front cables are all held in place with Zip ties (4), note the orientation and cut them. On the back of the unit, the cables (2) can be either held in place with clips as per the picture or zip tied in place. I figure there must have been a manufacturing change at one point in time. On the back of the panel (3) there are 3 screws to remove. Then remove the screws from the cable retainers on the front and remove the retainers (1).
Step 5: Remove the Taco Sensor
Yes that really is the name HP uses. Remove the two screws (1) and lift the sensor straight up. Be careful not to bend the metal slotted taco wheel. You now can lift the belt tension pulley and re-thread the belt over all the pulleys, make sure the alignment looks good. Reinstall the taco sensor.
![]() Step 6: Test before reassembly.
Before tying down all the connector closing the unit up. Startup the plotter as normal and test that the scanner motor is working. It should be obvious that it is fixed if the 9.1:10 error does not return on boot up but I like to run the motor a little to make sure the belt is running smoothly. Once the unit is started, open the scanner cover, and in the middle of the lid you should see 3 oval holes with sensors in them. Cover all three holes and the motor should engage and run and the rollers on the base should turn. If that all works, hooray, you have resolved the problem. Shut down the plotter again and tie down the cables and replace all screws and panels.
This issue is not documented in the service manual for this product, so if you follow only the manual you may order parts you don't need. The other causes listed in order of HP recommend replacement are the motor driver board (pricey), the stepper motor (reasonable) or several other interface boards of which did not even look for pricing on. The challenge with this failure is that if you troubleshoot based on the manual, the missing belt and a bad board give exactly the same outcome when troubleshooting. Checking this first can save time as it only takes about 5 minutes to remove the panels and confirm the problem.
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December 2022
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