LX90 Pinouts


LX90 power panel schematic and PCB layouts are here
Specifications for Meade LX90 and LX200 scopes are here



Following are diagrams for the pinout connections on a number of LX90 ports
All diagrams are shown with the locking tab facing down, cables should be viewed accordingly

Cable diagrams
You can see from these diagrams why you shouldn't try to use a network "crossover" or "uplink" cable with your LX90 Autostar. It's also apparent that you shouldn't use a CAT5 patch cable alone as well. If you must extend your HBX cable, use a straight through female-female coupler on your HBX cable, then add a standard CAT5 patch cable and plug that into your Autostar. A "straight through" F-F coupler is wired the same as a CAT5 patch cable, maintaining the pin to pin connections through the coupler.


10baseT cable wiring

The other alternative is to make your own cable from scratch. This keeps the wiring of the complete assembly proper. Improper cableing can result in a blown Autostar - know what you're doing ahead of time and use a VOM to check your connections. Do NOT go by color alone, your ultimate goal is to have the pin to pin connections at each end correct, not the colors. Note the position of the locking tabs on either end of the cables.


All wires were not drawn on the CAT5 cables, to preserve some clarity. The colored pins at each connector end notate the wiring, as does the numbered pin connections below the drawing. Also, note that the colors on the Meade HBX cable are only for reference to the 100baseT network cables. Meade may use different wire at times, and colors may not match. The colors used are the standard eight CAT5 cabling colors of orange, orange/white, green, green/white, blue, blue/white, and brown, brown/white.

RS232 cable wiring (Meade #505 equivalent)


Bolt , thread and wrench sizes (LX90)

Main Tripod bolt.....................................1/2-13 x 8 1/4" (threads only)
Collimation screws............................... 6-32x3/8"...5/64" allen wrench
Fork Cover screws.................................................3/32" allen wrench
Tripod adapter (base).............................................3/32" allen wrench
Base inspection cover screws................................. .050 allen wrench
Tripod head (6 wedge holes) .................................... 5/16-18 (coarse)
Azimuth adjuster holes (tripod)................................................... 8-32
OTA accessory screws........................................................8-32x1/2
Tripod adjustable leg locking bolts................................1/4-20 (coarse)
Focuser set screws..........................................................5/64" allen
Focuser flange.................................................................5/64" allen
Finderscope dovetail thumbscrews...................................1/4-20 x 3/4
Finderscope collimation thumbscrews...............................10-32 x 3/4
SCT rear port....................................................................2" x 24 tpi
Visual Back external threads......................................1.375" x  24 tpi


Common metric thumbscrews used on telescopes

Typical metric thumbscrews used on diagonals, barlows and visual backs are M2 (0.4 pitch), M3 (0.5 pitch) and M5 (0.8 pitch)


At the time this document was written, this information was up to date and correct, however companies change designs and wiring of circuit boards on a regular basis. It's strongly recomended that you check your scope first hand before making wiring decisions based upon these diagrams.

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