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Meade ETX-90EC Astro Telescope Instruction Manual
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Fig. 1: The ETX-90EC Astro Telescope.
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 WARNING! Never use the Meade ETX-90EC Astro Telescope to look at the Sun! Looking at or near the Sun will cause instant and irreversible damage to your eye. Eye damage is often painless, so there is no warning to the observer that damage has occurred until it is too late. Do not point the telescope or its viewfinder at or near the Sun. Do not look through the telescope or its viewfinder as it is moving. Children should always have adult supervision while observing. |
- Eyepiece
- Viewfinder
- Eyepiece Thumbscrew
- 90° Eyepiece Holder
- Optical Tube
- Vertical (or Declination) Lock
- Fork Mount Attachment Screws
- Fork Arm
- Focus Knob
- Horizontal (or Right Ascension) Lock
- Computer Control Panel
- Drive Base
- Hole Cover for Optional Tripod Legs (2)
- Right Ascension (R.A.) Setting Circle
- 1/4-20 Photo Tripod Adapter Block
- Flip-Mirror Control Knobs
- Photo Port
- Declination (Dec) Setting Circle (on left fork arm)
- Viewfinder Alignment Screws
- Viewfinder Bracket
- Electronic Controller with attached Coil Cord
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Remove the ETX-90EC from its packaging and place it on a sturdy surface. Place the eyepiece (A) and viewfinder (B) into their appropriate positions on the telescope and tighten the appropriate attachment screws to a firm feel only.
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Securely place the ETX-90EC on its side and remove the battery compartment cover (A) from the underside of the drive base. Insert eight AA-size (user-supplied) batteries into the battery compartment (B) in the proper orientation. Replace the cover and return the telescope to an upright position.
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Verify that the computer control panel power switch is in the OFF position. Remove the Electronic Controller (21, Fig. 1) from the packing materials and plug it into the HBX port (A). Tighten the vertical and horizontal locks (6 and 10, Fig. 1), then remove the dust cover from the end of the telescope tube.
NOTE: The telescope has rotational hard stops in the horizontal and vertical axes to prevent damage to the telescope. See Quick Tips for more information.
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Flip the Power Switch (A) on the computer control panel to the ON position. The lights flicker on the Electronic Controller. Press any key and the motors briefly move the telescope. The Electronic Controller is now operational.
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Use the arrow keys (A) of the Electronic Controller to slew (move) the telescope up and down and/or left and right. To change the telescope's slew speed, press the SPEED key (B). The indicator lights signify the slew speed with the upper light showing the highest speed. Each press slows the slew speed down one level then cycles back to the highest speed.
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Sight along the side of the telescope's main tube to locate an object. Practice using the arrow keys on the Electronic Controller to center an object in the telescope's field of view. Use the telescope's focus knob (9, Fig. 1) to bring the object into focus.
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Chapter 1: Getting Started
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