iOptron GEM45 User manual

Internal Use Only
Instruction for GEM45 board replacement
Ver. 1.1
December 10, 2020
Main board and RA board
1. Remove the two screws and take off the cover
2. Pull out the RA board carefully.
3. Carefully disconnect the wire harness from the
RA board.
4. Remove the screws and then remove the motor
5. Disconnect the wires from the main board and
remove the main board carefully.
6. Put in a new main board and connect the wires.
7. Put the motor back and install the three screws.
Make sure the belt is properly tightened. If
necessary, adjusted the three screws to make
the belt with proper tension (it can flex about 3
mm when press the middle of the belt).

Internal Use Only
8. Put in a new RA board and connect the wires.
Please pay good attention to the connections
between the main board and RA board
9. Put back the cover and lock it with the two
screws.
.
DEC board
1. Remove the two screws and take off the cover
2. Remove the three screws and remove the motor.
3. Do the same as removing the main board,
disconnect the wires and remove the DEC board.
4. Put in a new DEC board and connect the wires.
Then, put the motor back and secure it with the
three screws. If necessary, adjust the screws to
make the belt with proper tension (with about 3
mm flex when pressing the middle of the belt).
5. Finally, put back the cover and secure with the
two screws.