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
3-2
Failure of Upper or Lower Torque System –
CONDITION 2: The system is not stable; reel and torque arm oscillate.
Step
Diagnostic
Result
1
Verify that the locking nut that holds the reel to the shaft is tight. Also
check for a loose belt or loose set screws that hold pulleys to their shaft.
Any mechanical play between the Torque motor and the reel will result
in oscillations. Tighten as required.
2
Verify that the mechanical adjustments to the Torque Arm assembly are
correct. The spring tension adjustment should be checked and
corrected if necessary. (See Section 6.3.)
3
Oscillation could indicate worn brushes in the Torque motor or tacho
generator assembly. Replace brushes or motor/tach assembly.
4-1
Loop set does not function, Pulldown System –
CONDITION 1: Film is moved from the upper loop to the lower loop but does not
move back up.
Step
Diagnostic
Result
1
Check the 8-amp fuse (fuse 3) associated with the +24 volt supply of
the pulldown system; replace if defective.
2
Verify that the signal from the 2293 card, at TP12 on the 2293 card,
first goes positive as film moves down to the lower loop and then goes
negative. If not correct, replace the 2293 card; if voltage is correct,
replace the 2275 card.
Table 7.8: READY Diagnostic Table (Continued)
