Lexmark T-Series High Voltage Power Supply (HVPS) Access

The following procedure is specifically for the T63x machines, but all of the T models prior to the T650 (and even the old Optra S) are very similar. On the T650, the HVPS is directly behind the right side cover; it's much easier to get at.

Here's a view of the HVPS in a T642. The T64X HVPS has been failure-prone (917 errors).

Proceed as follows:

1) Toner Cartridge

2) Paper Tray (Tray 1)

3) Redrive Cap
- Lift it up at its right side end to remove it.

4) Back Door
- Open it to about 30º from vertical and you can pull it away off its hinges.

5) Redrive Assembly
- Two M4x8mm pan head thread-rolling screws.
- Two outward-hooking claws, left and right side, high up.

6) Right Side Cover
- One M3.5x10mm pan head threading screw from high up inside the redrive cavity.
- One M3.5x10mm pan head threading screw from inside the cartridge cavity.
- One claw at the front just above the MP Feeder.

7) MP Feeder Door/Platform
- Open it to about a 45º angle and it can be pulled off its flatted hinge pins.

8) Upper Deflector
- Pull the extreme left end of the piece toward you and force the deflector to the right. It can then be unhooked at the right end.
- NOTE that reinstallation of this item is complicated by a downward-projecting spike near its left side end. You really have to flex the thing to get it to go back into place.

9) MP Feeder Pick Roll
- One claw. Don't over-deflect it. It's easily snapped off. In the event of a claw snapping off, a small (3") ty-wrap works fine as a retainer.

10) MP Feeder Lower Deflector/Elevator Flap Assembly
- NOTE 1: This item is easily removed, but can be awkward to get back in place. Before proceeding, note carefully the relationship between the MP Feeder’s pickup cycle cam, and the cam follower that’s integral with the Elevator Flap. Keeping that relationship in mind at reassembly will be helpful.
- NOTE 2: At reinstallation, wipe off the face of the separation pad with methyl hydrate prior to putting the pickup roller back on its shaft.
- One M3.5x8mm pan head threading screw at the solenoid's base.
- Two M3.5x12mm pan head threading screws at the right side.
- Two M3.5x8mm pan head threading screws at the left side.
- Force the flap to open fully.
- Remove the spring.
- Dislodge the sensor cable and the sensor.

11) Inner Deflector
- Two tabs at lower front, left and right.
- Two upward-hooking claws near the upper rear; accessible through rectangular openings.

12) HVPS
- One spade terminal at the right rear. It can take a fair bit of force to get it off with pliers.
- One cable connection at the left front.
- Two M3x6mm pan head screws at the front.
- Pry up the PCA slightly at its right rear corner to free it from a small stud, and pull it leftward to free it.

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