Meade ETX-90PE Appendix Dchanging the LNT Module Battery, To replace the battery

Top Alignment	Side
screw	Alignment
	screw

Fig. 54: The LNT Module, with alignment screws and Atomic Time Update port visible.

Top Alignment

screw Atomic Time Update Port

Side

Spring Alignment

screw hole

Fig. 55: Interior side view of LNT Module.

	Top Alignment
	screw hole
Cover	Battery
Side	Spring
Alignment
screw hole

Fig. 56 Interior top view of

SmartFinder unit.

APPENDIX D:CHANGING THE LNT MODULE BATTERY

The LNT Module uses a lithium coin CR2023 battery that will last about 5 years and is installed with the original LNT Module assembly. After you replace the battery, you will need to recalibrate the telescope’s sensors and reset the time and date. You will need a new battery. Also, you may use Meade’s optional Atomic Time Update Module, although this is not necessary.

To replace the battery:

1.Remove the top alignment screw cap/long bolt from the LNT Module. See Fig. 54.

2.Remove the side alignment screw cap/long bolt from the LNT Module. Take note that there are two springs inside the LNT. One spring sits between the top and bottom of the unit. The second spring is on the side of the unit that rests between the bottom and the top sections. One long bolt passes through the top spring and the other long bolt passes through the side spring. Set the springs aside as you will need to replace it later in this assembly . See Fig. 55 and 56.

Important Note: Note there is some wiring inside the LNT Module. Be careful not to pull on the wiring. If it is necessary to move the wiring aside, do so carefully.

3.Carefully lift the top section of the unit from the bottom section. Do not remove the bottom section or disassemble the rest of the unit.

4.Remove the old battery. Note the spring.

5.Insert the new (user-supplied) battery. Take care to orient the battery so that the side with the battery markings is facing the top.

6.Replace the top spring in place and the LNT Module cover.

7.Replace the top bolt and tighten the cap to a firm feel.

8.Hold the side spring in place with your fingers and slide the spring between between the top and bottom sections. The spring should line up with the mounting holes for the side long bolt. Slide the long bolt through the side hole, then through the spring and finally through the bottom of the LNT Module and tighten to a firm feel.

9.Next you will need to recalibrate the LNT Module sensors. Select Calibrate Sensors from the Setup: Telescope menu. A scrolling message displays.

10.The message prompts you to place the telescope in the home position:

•Loosen the telescope’s vertical lock (6, Fig. 1B). This will allow you to move the telescope’s optical tube up and down.

•Level the tripod head. See Step #3g, page 12. Level the optical tube by lining up 0° on the Dec setting circle (16, Fig. 1a) with the Dec pointer (the small molded triangle under the setting circle).

•Retighten the vertical lock (6, Fig. 1b) to a firm feel only.

•Unlock the horizontal lock (9, Fig. 1a). This will allow you to rotate the telescope tube and fork arm assembly.

•Grasp the telescope by a fork arm and rotate the telescope counterclockwise until it stops.

•Re-lock the Horizontal lock (9, Fig. 1).

11.Press ENTER. The telescope will automatically find North, detect level and the tilt of you telescope, and calibrate the sensors.

12.Next, follow the instructions included with the Atomic Time Update Module optional accessory to reset the clock.

OR

Enter the date and time manually using the Date and Time options in the Setup menu.

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