iOptron CEM70 Manual

Belt tension adjustment

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Tool need: a set of metric hex keys, a small flat head

screwdriver

RA Belt Adjustment

1. Set the mount to Zero Position. Locking RA axle by

insert the locking Allen wrench. Release RA gear

switch but keep the DEC gear switch engaged. Flip

the mount head to let it sit on dovetail saddle.

2. Release altitude locking screws on both sides. Turn

the altitude knob to adjust it to ~ 40 degree to

expose the RA motor and belt. Lock the GPS side

altitude locking screw but remove motor side one.

3. Remove 5 socket screws to separate mount left

base supporting plate.

CEM70 Belt Tension Adjustment

Remove this one

4. The motor was secure by 3 socket screws. To adjust

the belt tension, loosen these screws a little bit.

5. Tension the motor properly. If need more tension,

insert a flat top screwdriver and gently push the

motor outwards while tighten the screws. When the

belt can be pushed down 3mm, it should be about

the correct tension.

Page 1 CEM70 Belt Tension Adjustment Tool need: a set of metric hex keys, a small flat head screwdriver RA Belt Adjustment 1. Set the mount to Zero Position. Locking RA axle by insert the locking Allen wrench. Release RA gear switch but keep the DEC gear switch engaged. Flip the mount head to let it sit on dovetail saddle.
Page 2 6. When put the side plate back, it needs be very And slightly pull the cables to make sure they move careful not to jam the wires. freely. 7. Slide the side panel on and arrange the cables to go into the slot.
Page 3 DEC Belt Adjustment 5. Slightly release 3 screws that hold the motor on worm assembly. To tighten the belt, gently push the 1. Rotate the mount in RA to expose the DEC motor motor outward. Hold the motor while tightening cover under the DEC saddle.