Lexmark Tray Bias Roller

Just inside the Tray 1 cavity, at the right side, there's a roller mounted in a spring-loaded arm; that's the Tray Bias Roller. It keeps Tray 1 shoved (biased) leftward to align it with the chassis and to assure reliable operation of the auto size sensing feature. It also serves as a detent pawl to hold the tray in its closed position. The rollers occasionally acquire a flat spot and need to be replaced. Here's a view of a flat-spotted roller, with a new roller to its right. (You have to transfer the spring to the new part.)



Beginning with the Optra S and continuing on through the T630, the service replacement part was P/N 99A0026. On the T640, the P/N has changed to 40X0213. There is no dimensional/functional difference between the two parts that I can see, but P/N 40X0213 is considerably less expensive than P/N 99A0026. (This is not the first time I've seen a gross inconsistency in Lexmark's parts pricing.)

The thing to do, obviously, is to order and stock only the T640 part, P/N 40X0213.

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To replace one of these, remove the cartridge, tray 1, the redrive assembly and the right side cover. The front end of the spring is hooked onto an anchor post very near the front of the printer. Here's a view of that.

Get a firm grip on the straight section of the spring with long-nose pliers and you can unhook the spring from its anchor post. Note the spring's path through the chassis member as you extract it. Transfer the spring to the new part, thread the spring back through and anchor it. Confirm that the roller arm's pivot-point is correctly seated before buttoning up the printer.

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