Meade ETX-90EC Instruction Manual page 15

Object appears in the viewfinder but not in the eyepiece:
The viewfinder is not properly aligned with the telescope (see
•
Slew speed does not change when the SPEED key is pressed or the telescope moves slowly even though
the fast slew speed is chosen:
Verify that only one light is lit on the Electronic Controller. If more than one light is on or blinking then the
•
Mode function is active. Exit the Mode function by pressing and holding the MODE key until only one light is
on (seeElectronic Controller
The battery power may be low (see
•
Telescope does not track a celestial object:
The telescope can only track celestial objects automatically if it is properly polar aligned and the motor drive
•
has been activated (see
Images through the eyepiece appear unfocused or distorted:
The magnification used may be too high for the seeing conditions. Back off to a lower power eyepiece
•
(seeUnderstanding
If inside a warm house or building, move outside. Interior air conditions may distort terrestrial or celestial
•
images, making it difficult, if not impossible, to obtain a sharp focus. For optimal viewing, use the telescope
outside in the open air instead of observing through an open or closed window or screen.
If viewing a land object on a warm day, heat waves will distort the image (see
•
For clear viewing of objects, turn the focus knob (9, Fig. 1) slowly since the "in-focus" point of a telescope is
•
precise. Turning the focus knob too quickly may cause the focus point to pass without notice.
The optics within the telescope need time to adjust to the outside ambient temperature to provide the
•
sharpest image. To "cool down" the optics, set the telescope outside for 10 to 15 minutes before observing
begins.
Telescope moves off a terrestrial object while observing:
The motor drive may be activated (see
•
Verify that the vertical and horizontal locks are tight (see
•
Telescope does not move past a certain point:
The built-in vertical or horizontal rotational "stops" may have been reached (see
•
Telescope pauses when changing slew direction:
This pause is normal (see
•
A terrestrial object appears reversed left-for-right:
An eyepiece in the standard 90° observing position (4, Fig. 1) yields this image orientation. To view a
•
correctly oriented image, the optional #932 Erecting Prism is required (see
Meade Customer Service
If you have a question concerning the ETX-90EC, call the Meade Instruments Customer Service Department at
(949) 451-1450, or fax at (949) 451-1460. Customer Service hours are 8:30 AM to 4:30 PM, Pacific Time, Monday
through Friday. In the unlikely event that the ETX-90EC requires factory servicing or repairs, write or call the
Modes).
Assembly
Polar Alignment Procedure
Magnification).
Modes of
Arrow Keys).
THE VIEWFINDER).
Instructions.)
and Modes of Operation).
Operation).
Telescope Controls).
Terrestrial Observing).
Rotational Limits).
OPTIONAL ACCESSORIES.