The supply voltage for the lens motors is below its minimum.

Measure on the Signal Backplane the +24V voltage on pin 9, 10, 11 or 12 of the connector of the wire unit which comes from the SMPS board. See image.

(The supply voltage for the lens motors is derived form the +24V on the Cinema Controller board. The +24V supply is generated on the SMPS board and enters the Fan Control board and Cinema Control board via the Signal Backplane. )

If the measured voltage is about 24V then:

1. reseat the Cinema Controller board. See "Replacement of a Card Cage board".

2. if the problem remains, replace the Cinema Controller board.

If the measured voltage is not OK then:

1. Check the Signal Backplane for bad connections or short circuits. Ensure that all wire units are well connected.

2. Check the wiring (reference 1 image) of the Anode fan (reference 2 image) for short circuits.

3. Check the wiring (reference 3 image) of the Cathode fan (reference 4 image) for short circuits.

4. replace the Fan Control board. See "Replacement of a Card Cage board".

5. replace the SMPS board. See "Replacement of the SMPS board".