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7

Uncrating the NGT-12.5

Follow the steps below to uncrate the NGT-12.5. It is recommended that you review the instructions completely
before beginning with step 1.

1. Remove the cardboard top from the shipping pallet. Remove the truss rods and any larger accessories. (You

may wish to save the foam tubing that wraps the individual rods. Cut the tubing shorter and leave it on the rods
during normal use to provide insulation—especially desirable on cold nights—and also to protect the finish during
transport.)

2. Remove the shrink wrap that holds everything stationary.

3. Remove the two cords that tie the nose assembly to the spring clips on the tub. Remove the packing material

then lift the nose assembly out and set it aside.

4. Remove the box of NGT-12.5 accessories.

5. Remove the two cords tying the tub to the handles of the base assembly.

6. Remove the dust cover from the primary mirror.

7. Remove the packing material from inside the tub, including the pieces of foam wedged between the edge of the

mirror and the side of the tub.

Do not remove the fine tissue from the mirror at this time.

8. Remove the packing material from between the bottom of the tub and the split-ring assembly.

9. Remove the protective wrapping of tape from around the three chromed counterweights located underneath the

tub. Unscrew the counterweights by turning them counter-clockwise, taking care not to tip the tub too close to
vertical, as these counterweights hold the mirror cell in place.

10. Grasp the mirror cell handles and lift the mirror and its cell out of the tub, setting it aside gently.

11. Carefully remove the protective tissue covering the primary mirror. Lift it straight up and off.

Do not drag the

tissue across the face of the mirror. Do not touch the mirror.

12. Remove the cord tied between the split-ring assembly and the latitude adjustment knob on the base assembly.

Carefully remove the packing material from between the drive roller bearings and the drive ring. Do not allow the
drive ring to drop on the drive roller bearings.

13. Remove the three bolts holding the base frame to the shipping pallet and remove the telescope from the crate.

Shipping Damage

In an effort to reduce in-transit damage, each NGT is shipped with a shock detection device called a Shockwatch

. If

the shock indicator has turned red this shows that the crate has been handled more roughly than we like. In that
case, make a notation on the delivery document (with the signature of the delivery person if possible) then contact the
carrier and JMI directly.

Summary of Contents for NGT-12.5

Page 1: ...NGT 12 5 Owner s Manual JMI Telescopes Jim s Mobile Inc 8550 W 14th Ave Lakewood CO 80215 U S A WARNING Viewing the sun without proper equipment can cause permanent blindness...

Page 2: ......

Page 3: ...g the Telescope 11 Polar Alignment 11 Importance of the MAX Computer Dec 0 Setting 11 Electrical Connections 12 Optional Battery Pack 12 Using the Command Center 13 If You Suspect Improper Tracking 14...

Page 4: ...oot of the nose assembly permit adjustment of the focal point of the telescope relative to the focuser The placement depends on whether the scope is being used with a camera and off axis guider a came...

Page 5: ...uipment EZAlign Polar Alignment Scope After a one time alignment this unit simplifies the process of aligning on the celestial pole The constellation reticle works in both the northern and southern he...

Page 6: ...e fully assembled telescope to be rolled easily over most surfaces Observatory Mounting This hardware option permits the NGT base to be secured to a concrete pad or pier for permanent or semi permanen...

Page 7: ...the split ring assembly 9 Remove the protective wrapping of tape from around the three chromed counterweights located underneath the tub Unscrew the counterweights by turning them counter clockwise ta...

Page 8: ...r mounting bracket Encoder cable Three 3 leveling screw pads metal discs Optional Equipment Nose assembly light baffle Focuser upgrade NGF DX2M NGF DX1 NGF DX1M DRO or DFC option Telrad adapter plate...

Page 9: ...beneath the tub Be sure to tighten them equally to assure correct positioning of the mirror cell 5 Tighten the right ascension and declination tension knobs 6 Three truss rod clips are located 120 ap...

Page 10: ...outh side Indexed nose assembly foot Focal Points and Eyepieces The three screw holes in each foot of the nose assembly permit the nose assembly to be properly placed to adjust the focal point of the...

Page 11: ...h the extra CCD camera counterweight to the bottom of the tub Remember a balanced telescope is a happy telescope Polar Alignment For a surprisingly accurate and quick polar alignment simply place the...

Page 12: ...r the declination bearing which is opposite the declination motor It utilizes a 4 conductor modular phone plug that connects to the declination encoder jack Disconnect this cable at the Encoder jack p...

Page 13: ...and its direct drive period is approximately 80 minutes PEC is neither necessary nor practical Should you inadvertently enter the PEC mode the LED to the right of the PEC button is flashing or lit con...

Page 14: ...escope will be driven in the same direction as the Earth s rotation making the sky appear to drift at twice its actual rate To change this setting remove the four screws from the sides of the Command...

Page 15: ...over time Compressed air can also be used as long as you are careful to keep any propellant from being discharged onto the mirror A tub large enough to allow the mirror to be fully immerse Fill the t...

Page 16: ...limation of a Newtonian reflector Accurate placement of the secondary mirror is the first step in collimating and absolutely crucial to the performance of the NGT In Newtonian reflectors with fixed fo...

Page 17: ...e reflection of the primary mirror in the diagonal A generally dark field A brightly lit annulus or ring in the center of the field A dark spot or bull s eye in the center of the annulus Detail of the...

Page 18: ...lignment of the secondary Check the secondary to determine whether it must be raised lowered rotated or tilted While this process may require several repetitions the first few times you will find that...

Page 19: ...ntric perfectly circular rings is seen 6 Rotate the nose assembly 180 about the tube Relocate the star and observe the disk of the star If necessary adjust the secondary via the screw nearest the focu...

Page 20: ...JMI Telescopes Jim s Mobile Inc 8550 W 14th Ave Lakewood CO 80215 USA 303 233 5353 Fax 303 233 5359 info jmitelescopes com...

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