Opening The Back Cover - Changing The Fuse; Using A Relay Adapter Box With The Stx - SBIG STX Series Operating Manual

1.13. Opening the Back Cover - Changing the Fuse

STX cameras have a built-in voltage regulation that lets you run the camera directly from any
unregulated 12VDC source such as car battery. The input to this supply is protected with a fuse
located inside the rear of the camera. To access the fuse, place the camera face down on a
smooth clean surface. To help avoid any static damage, touch something metal that is grounded
before opening the camera. Open the back cover plate of the camera by removing the eight
socket head screws located around the perimeter of the back plate. Carefully lift the rear cover
and turn it over. You will see a wiring harness for the fan that prevents the cover from being
completely detached, but the wires should be long enough that the cover can be placed out of the
way without unplugging the harness. The fuse is located on the digital board as shown in the
right hand photo above. .

1.14. Using a Relay Adapter Box with the STX

section for changing the fuse. Unlike the fuse, however, the jumpers are not on the top board, so
it may be easier for this procedure to unplug the fan wiring harness from the digital board to get
the wires out of the way. Then, remove the five long Phillips screws from the digital board as
indicated by the arrows in the photo above. Note also the location of the rectangular box outline
in the same photo. This outline indicates the location of a connector on the bottom of the digital
board that attaches to the board below (visible in the next photo). To remove the digital board
STX cameras use opto-isolated relays that isolate
the camera, electrically, from your mount's drive
electronics. It is therefore unlikely that a Relay
Adapter box will be needed with any commercial
mount. However if you wish to use the Relay
Box with mechanical relays for other reasons,
then jumpers must be set inside the camera to
provide 12V out on one pin of the SCOPE port.
This is needed to supply power to the Relay
Adapter Box before it can be used with the
camera. To set the jumpers, remove the back
cover of the camera as instructed in the previous
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