Chromira Lab TECHNICAL SUPPORT DOCUMENT CL024
29 October 2008
Replacing the Head Belt
The purpose of the Head Belt is to drive the Head back and forth on the Air Rail during printing. With use,
the Belt may become slack, causing the Head to lose it’s position relative to the Air Rail. If this happens,
the software may detect it and produce an error message.
Tools/Parts Required:
•
•
•
7/64” Allen Wrench
Needle Nose Pliers
Head Belt, part # BLT C30 Head Belt
Procedure
UNLOAD THE PAPER BEFORE BEGINNING.
1. Remove the Sleeves panel for access to the print engine.
2. Turn on the Air Solenoid by pushing down on the
Solenoid actuator and turning it ¼ turn clockwise to lock
the solenoid open.
3. From the main operating window of the Chromira ProLab application, click the Diagnostics icon.
Expand the “Print Engine” section, and highlight “Head”. This will open some options at the bottom
of the window. Click the “OFF” button on the bottom of the page.
4. Move the Head to the middle of the Air Rail.
5. Note the routing of the Head
Belt. The Head Belt is
indicated as bright green in
some of the images for
reference only. The actual belt
is black.
6. Loosen the belt clamp on the right and left sides of
the Carriage. Do not remove the screws, only
loosen.
7. Remove the old Head Belt. Use caution to prevent
damage to the Encoder strip that is located above
the belt.
8. Insert the end of the new belt under the belt clamp,
with the smooth side of the belt facing towards you.
Route the end through the opening in the Carriage
as shown. A pair of Need Nose Pliers can be helpful
for this procedure.
9. Pull the end of the belt out approximately 2 inches.
10. While holding the belt perpendicular to the edge of
the Carriage, and centered between the clamp
screws, tighten the screws to fix the belt to the right
side of the Carriage.
11. Keeping the orientation of the belt the same as it is
at the Carriage, route the belt around the Turnaround pulley at the right side of the print engine.
12. Using caution not to damage the Encoder Strip,
carefully route the belt between the Carriage plate
and the Air Rail.
13. Route the belt around the Head Motor Pulley and
back towards the Head Carriage.
14. Insert the end of the belt under the belt clamp and
route the end through the opening in the Carriage as
shown.
15. Pull all the excess belt through the carriage.
16. While pulling the belt tight, and holding the belt so
that it is perpendicular to the Carriage edge, and
centered between the two clamp screws, tighten the
clamp screws.
17. From the Diagnostics screen, click the “ON”
button. This will turn on the motor and hold it in
place while you test for proper belt tension.
18. Move the Head Carriage from the center position
towards the left side. The Carriage will be difficult
to move, but you must move the Carriage. If the
Carriage moves, without the belt skipping around
the pulleys, then it is at the proper tension. If the
belt skips, it will be necessary to increase the
tension. To increase the tension, click the “OFF”
button in the diagnostics window and follow the
steps below.
a. While pulling on the excess end of the belt,
loosen the clamp screws on the left side of
the Carriage, and pull the belt tighter.
b. While holding the belt tight, tighten the
clamp screws.
c. Repeat steps 17 and 18 until the belt does
not skip while moving the Carriage.
19. When the belt is set to the proper tension, clip the
excess leaving about 2 inches hanging out of the
Carriage.
20. From the Diagnostics screen, click the “OFF”
button, and move the Carriage back to the Home
position, (far right).
21. Manually turn off the Air Solenoid, by turning the
valve a quarter turn clockwise.