Warp factor consistently above ±0.5 but below ±2.0

7.Check accuracy of vertical stop. Use a carpenter’s level to do this.

8.Are alignment stars being centered with reasonable precision? A high-power eye- piece (at least 10mm focal length), or an illuminated reticle eyepiece (preferred) is recommended.

9.Check encoders as outlined previously.

10.Try to use alignment stars that are well above the horizon. Light from stars is refract- ed as it travels through the atmosphere and starlight near the horizon has to travel through the greatest amount of atmosphere before reaching your telescope. Stars near the horizon can appear as much as 2° away from their actual position.

11.Avoid long delays between aligning on the first and second alignment stars. The stars in the night sky appear to move due to the rotation of the Earth. If you take more than a few minutes to align on the second star, this stellar motion will result in an increase in the warp factor (and decrease the resultant pointing accuracy). This is because the controller does not yet have a frame of reference to tell which way the stars should appear to be moving before the second star is aligned on.

Warp numbers larger than 2.0

12.Are the stars you aligned on actually the stars you select-ed on the controller? Consult the finder charts in Appendix A if you are unsure.

13.The encoder sensors may be coming into contact with the encoder disks. Check both the altitude and azimuth encoders as outlined above.

Altitude readouts do not change when you move the scope (during “ALT AZM TEST”)

14.Check the altitude cable’s connections.

15.Make sure the knob that goes through the altitude encoder is tight.

Azimuth readouts do not change when you move the scope (during “ALT AZM TEST”)

16.Check the azimuth cable’s connections.

17.Make sure the hex lock nut on the azimuth axis screw is tight. The fender washer underneath the hex lock nut should not be able to move. Remember, the hex lock nut should be tightened about 3/16 to 1/4 turn beyond the point where the washer can- not move any longer.

18.Try disassembling then reassembling the azimuth encoder by disassembling the top and bottom groundboards of the base.

If you need to contact Orion Technical Support, email support@telescope.com or call (800) 676-1343.

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Orion 7880 instruction manual Warp factor consistently above ±0.5 but below ±2.0, Warp numbers larger than

7880 specifications

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