Service manual

7: Troubleshooting Guide
CHRISTIE INC. CHRISTIE INC. - - 35/70 Service/PM Manual
July, 1997
IMAGE QUALITY DIAGNOSTIC TABLE
3
Poor Image Quality –
CONDITION 3: Projected picture has side weave in excess of 0.15%.
Step Diagnostic Result
Verify the edge guides are adjusted properly and have the proper spring
tension. Adjust if necessary. (See Section 6.8.4.)
4
Poor Image Quality –
CONDITION 4: Projected picture exhibits ghosting.
Step Diagnostic Result
1 Rotate shutter encoder assembly to eliminate ghosting. This is a one
time factory adjustment and should not be necessary unless parts
associated with the shutter system have been replaced.
2 If the shutter ghosting adjustment must be made on a regular basis,
verify that all mechanical parts are properly tightened. A loose
coupling or set screw could allow the shutter blade to slip on its shaft
and alter the shutter timing.
3 Ghosting can also be caused by a failure of the Pulldown system to pull
down and register in the allowed time. Check the Pulldown system
fuses (fuses 1 and 3).
4 Verify that the +24-volt and -34-volt supplies are correct while the
projector is moving forward in cine mode.
5 Verify that the connections associated with the Pulldown motor are
good.
6 Replace the 2275 card.
7 Check the brushes in the Pulldown motor.
Table 7.14: Image Quality Diagnostic Table (Continued)