Contex HD Ultra X Series Guide

June 2018
OTAC Replacement Work Instruction
Tools required:
T10 screwdriver
Pliers
T20 screwdriver
E-clip Tool (size 5)
Small Flat Screwdriver
Prerequisite
Disconnect power from the scanner.
Removing the OTAC Unit
1. Open the OTAC Assembly by
depressing the Lid Latches at
both ends.
2. Use a cloth (or similar) to cover
the gap in the lower chassis, to
prevent the e-clip from falling into
the chassis, then remove the E-
clip using small flat screwdriver.
3. Repeat for the right end, again
making sure to use a cloth to
prevent the e-clip falling into the
chassis.
4. Slide a piece of paper under the
Guide Plate Hinge, to prevent
the T20 screw falling into the
chassis while removing it from
the side plate.

HD Ultra X Series Instructions 2
5. Repeat for the other end of the
Guide Plate.
6. Lift the OTAC and remove the
brass spacers at both ends.
7. Carefully push the Gas Piston off
from the bracket, making sure
not to cause any damage.
8. Repeat for the other end of the
Guide Plate.

HD Ultra X Series Instructions 3
9. Carefully lift the whole OTAC
Unit, including the Top Lid Cover
off from the chassis
Replacing the OTAC Unit
1. When replacing the Guide Plate,
make sure the Gas Pistons go
inside of the end plates
2. Position the Gas Piston over the
pillars on the end plates at both
ends.
3. Lift the OTAC and refit the brass
spacers at both ends.

HD Ultra X Series Instructions 4
4. While pressing down on the
Guide Plate, to align the screw
holes, and using paper to cover
the gap to prevent the screw
falling into the chassis, refit the
long T20 screw. Do this at both
ends of the Guide Plate.
5. Use an e-clip insertion tool, (or
pliers) to refit the e-clips over the
Gas Piston bracket. Make sure it
is fully clicked in place. Repeat at
both ends.
6. To refit the Lid Cover, with the
OTAC at its highest level,
position the Lid Cover back on
the Guide Plate.
7. Making sure the locating pins go
into slots on the OTAC at both
ends.

HD Ultra X Series Instructions 5
8. Retighten the 3 x T10 locking
screws to hold the Lid Cover
down and in place.
9. Press down on the Guide Plate
until both ends lock in place to
close.
10. With the scanner powered up,
and the OTAC pushed down,
with the added +1 click on the
ratchet, make sure the LED for
the raised lid is off.
11. If the LED does NOT go out
when the OTAC is closed, then
remove the rear panel to access
the sensor, to make adjustments.
Remove the T10 screws and lift
the rear panel off from the back
of the scanner.

HD Ultra X Series Instructions 6
12. Insert a T10 screwdriver into the
access hole in the back of the
scanner, loosen the locking
screw, and move the sensor
bracket up or down until the Lid
LED goes out.
13. Retighten the screw.
14. Retest the LED but raising the
OTAC, and pressing down,
adding the +1 ratchet click. If the
LED is correctly setup (still off),
then refit the rear cover.
Video Work Instruction: http://www.training.contex.com/OTAC