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
READY DIAGNOSTIC TABLE
5-4
The Constant Velocity sprocket will not advance film one frame and lock –
CONDITION 4: The constant velocity motor starts to move film, but stops part
way. Motion continues or completes if CV sprocket is restarted with assist by
hand.
Step
Diagnostic
Result
This indicates worn brushes in the Constant Velocity motor. Replace
brushes or motor.
6-1
The Pulldown System has performed a proper Loop Set, but failed to advance film
and lock. Since a Loop Set was performed in Section 3 of this table, those checks
need not be repeated.
CONDITION 1: Pulldown sprocket offers no resistance to movement by hand.
Step
Diagnostic
Result
1
Replace 2275 card.
2
If problem still exists, replace 2293 card.
6-2
The Pulldown System has performed a proper Loop Set, but failed to advance film
and lock.
CONDITION 2: Pulldown sprocket is not stable; oscillation produces audible
sound. This is caused by a fault in tach circuit.
Step
Diagnostic
Result
1
The fault could be associated with the tach circuit on the 2293 card.
Replace 2293 card.
2
The brushes associated with the tach on the Pulldown motor assembly
could be worn. Replace brushes or motor assembly.
Table 7.8: READY Diagnostic Table (Continued)