SVS MINI 7EX 110V - Manual (Page 14)

13. MAINTENANCE AND ADJUSTMENTS
a. Maintenance
• Inspect the Lift occasionally for any loose bolts or cable clamps. The scissor bolts are adjusted for no
slack, but must not be too tight. If scissor bolts are found loose, tighten to approximately 151 lbs torque,
the back off 1/8-inch. These bolts have nylon locking nuts and should stay at this position.
• Check Lift and projector cables for damage or wear.
• Check the Drum Lock Assembly to see if the Drum Lock solenoid energizes and raises the Drum Lock
arm when you press the Down toggle switch to lower the Lift. At all other times the Drum Lock
solenoid is de-energized and the Drum Lock arm stays in its down position. If the solenoid does not pull
up, the microswitch will not allow the motor to turn when to lowering the Lift.
• Check the Drum Lock pawl (white nylon piece) located on the Cable Drum. The pawl should move
freely and drop when when it reaches the top of the Cable Drum's rotation, avoiding contact with the
Drum Lock arm. If the drum rotates too fast, the pawl will swing out and catch the arm, locking the
drum after the first rotation.
• The Cable Drum Bearings (pillow block bearings) are pre-lubricated and do not require attention.
• The Lift motor does not require attention. If the magnetic brake (part of the Lift motor) does not hold
properly, it should be replaced immediately.
WARNING
To prevent personal injury and property damage when servicing any part of the lift drive system (electric
motor/brake, drive chain/sprockets, steel lift cables, and/or drum lock assembly) the projector must be
removed and the lift's lower frame supported by straps, chain, or cable to prevent it from lowering
unexpectedly while the drive system is being serviced.
SVS Mini 7EX Lift Installation Instructions Page 14 of 17