7 : T r o u b l e s h o o t i n g G u i d e
CHRISTIE INC.
CHRISTIE INC. -
- 35/70 Service/PM Manual
July, 1997
T R O U B L E S H O O T I N G G U I D E
Only technicians who are familiar with the detailed circuit descriptions in Section 5
and the adjustment procedures in Section 6 should attempt to troubleshoot or
repair a problem.
This section provides information for diagnosing and troubleshooting operational problems with the 35/70 projector. The
projector consists of hundreds of components. It is impossible to foresee all problems that might occur. However, the
procedures outlined in this section should identify the problem area.
Checklists and troubleshooting tables are provided for the following areas:
•
Visual Checklist
•
Power-On Checklist and Diagnostic Table
•
Ready Checklist and Diagnostic Table
•
Slew Motion Checklist and Diagnostic Table
•
Cine Motion Checklist and Diagnostic Table
•
Image Quality Checklist and Diagnostic Table.
Use of the Troubleshooting Tables
This section presents a series of operational checklists and troubleshooting tables. They have been created to be used as
part of a deliberate, organized approach to problem isolation. This approach consists of starting with the projector turned
off, performing visual diagnostic checks, threading the projector with film, and performing operational checks. A turn-on
and operating sequence requires the technician to observe a sequence of projector operations, continuing until an
abnormal condition occurs. For each observed abnormal condition, an associated table isolates the particular failures or
mis-adjustments that can cause the condition. Repair or adjustment is described to allow the technician to repeat the
sequence, progressing to the next abnormal condition. This approach has the advantage of being effective in the case of
multiple failures and of making the most basic corrections first in the sequence.
The tables have been arranged to be used as a checklist and data table. While experienced technicians will often attempt
to short-cut the procedure or perform it by memory, the most effective approach is to copy this section of the manual and
use it as a checklist for troubleshooting, and then retain it as part of the failure history of the projector, at least until
sufficient proper operation shows that the repair is truly verified.
These checklists should be performed as part of the technician's training on machines that are known to be operating
correctly. Familiarity with the visual conditions, the amount of play in mechanical systems, and the proper speed of
operations is essential to the diagnostic process.
In a case where multiple failures are suspected, remove the four fuses associated with the drive motor systems (fuses 1 to
4). See Table 7.1 for fuse block identification. Start through the checklist and bring one system back on line at a time,
starting with the Lower Torque. Follow with the Shutter, the Upper Torque, the Constant Velocity, and finally the
Pulldown, replacing the required fuses as you progress. After the Lower Torque system is on line, the READY state must
be achieved before the next four systems can become operational. Verify that all buckle and limit switches are inactive, or
the projector will not go into READY state.
