Xerox WorkCentre 5945 / 5955 & AltaLink B8090 Families Repair Procedures – an Anatomy Lesson – Part 2 WC-5945, 5955, AL-B8090, B8075, B8065, B8055, B8045

We’re going to continue our exploration of these models where we left off last month. As you saw, they’re easier to work on than one might expect, with just a few eccentricities and tricks to be aware of. We’ll take a look at how to remove the power supply unit, as well as the paper drawers and feed heads.

But first, let’s discuss a couple common problems with the document feeder and how to solve them. The feeder has a new acronym (SPDH, short for single-pass document handler), named for a nice feature new to this series. It can scan both sides of documents with one pass thanks to a scanning CCD, called the side-2 scanner, mounted to the underside of the document handler.

When copying from the SPDH, one vague message, which can be frustrating to customers and technicians alike, reads, “Due to a system error, all scanned jobs have been deleted.” This was a common problem on the 5945 and 5955, and not as frequent with the redesigned SPDH on more recent models. It occurs when the machine becomes confused about whether or not there is another document on the document feed tray. A similar symptom is fault code 305-966, when the document feed tray refuses to lift with one remaining original on the tray. Built into the feed tray is the last sheet sensor, which reads whether or not a document is still on the feed tray.

It was discovered that early build models had a sensor that was over-sensitive to light. Xerox recommended moving the machine so it wasn’t under bright lights, because the sensor could actually see through a document so it appeared that one wasn’t there. The solution was an improved version of the last sheet sensor, which was basically the same sensor with a piece of dark translucent tape over its eye.

The original sensor part number was 130E19330, while the new one is 607K04310. There is also a kit available to add the improvement to the old sensor (5945DLSIK/655N00489—document last sheet sensor improvement kit). To access the sensor, remove the document rear cover (three screws) and lift the document feed tray to reach the sensor underneath (see photo 1). Note how this sensor is seated, as it won’t be obvious how it sits when you try to put it back in place. The tape over the eye of the sensor should wrap all the way around so it adheres to itself, or else it tends to detach from the plastic of the sensor (see the example in photo 2).

Another common problem, which was solved in the field, was damage to the center lead edge of documents accompanied by document misfeeds. This turned out to be caused by the little clear Mylar sheet before the document separation tire, and a flat spot wearing into the surface of the separation tire. This was fixed by installing a longer piece of Mylar, which extends about 2mm further toward the separation tire than the original Mylar. See photo 3 for an example of a Mylar that is too short.

Next let’s explore how to remove some of the other parts.

Power Supply Unit (LVPS + AC Power Supply)

1. Remove the rear and lower-rear covers.
2. Disconnect the five connectors (see photo 4).
3. Remove the two screws (one at bottom center, one in the upper-left corner) and remove the power supply. The power supply unit can now be lifted away.
4. Disconnect the ground wire from the main ground point on the top-left corner of the power supply (one nut).
5. When you install the replacement power supply, make sure you tighten the nut on the ground point well. Also check the frame ground lug to ensure it’s tight as well; sliding out tray 2 will give you better access to it. Double check the ground circuit by measuring with an ohm meter between the ground pin on the power supply (P/J651) and the frame—it should measure less than 10 ohms.

Paper Feed Heads for Trays 1 and 2

1. Remove paper trays 1 and 2; slide them all the way out, then lift the rear end straight up on both sides to sneak by the tray stops.
2. Disconnect the feed head connector inside the paper tray cavity and remove one screw from the front end (see photo 5).
3. Lower the front end of the feed head while you slide it out. Note that it’s possible to remove the feed rollers (feed, nudger and separation) without removing feed head.

Paper Trays 3 and 4

1. Remove trays 1 and 2 so you can access the area behind trays 3 and 4 from above. Look for wadded-up paper behind the trays, which can cause problems ranging from paper lift failures to false tray home or paper size sensing.
2. Take off the front panel (two screws from the top). Note that during reassembly, you’ll want to seat the two hooks first (see photo 7).
3. Remove the tray stops from along the edge of the bottom frame (one screw for each of the three stops, see photo 6).
4. Slide the tray out and lift it out along with its rails. With the tray stops off, the stationary part of the rail is able to slide forward slightly, so you can lift the anchors at the rear end of each rail out of their anchor points in the bottom frame.
5. When you are ready to reinstall the tray, line up the metal anchors on the bottom rear of each rail, with the holes in the bottom frame of the drawer unit.
6. Slide each of the anchors toward the rear until they seat properly (see photos 9 & 10). You will need to reach your arm in from above (from the cavity where trays 1 and 2 would be, see photo 8).
7. Reinstall the tray stops so the rail anchors cannot come out again.

Tray 3 and 4 Feed Heads

1. Slide trays 3 and 4 all the way out.
2. Take off the machine’s rear and lower-ear covers.
3. Disconnect the connectors: one feed/lift motor connector, two in-line connectors and the tray home sensor connector (which is down on the bottom frame). Depending on which version of the assembly you have (with or without tag 003), there may be a fourth connector to disconnect.
4. Remove two screws (see photo 12), then slide the feed head out through the rear. Be careful not to get caught on any of the wiring harnesses; as you can see in photo 9, the wiring is rather messy in some cases.
5. When reinstalling the feed head, slide it most of the way in, then go to the front to line the metal tongue up into the hole in the frame where it should seat. You will also want to be sure the plastic slot under the tray 4 horizontal transport is riding on the metal rail as it should (see photo 13).

That should do the trick—I hope this info proves helpful! Have a good month, and I wish you all stay healthy.