Meade LX200 Classic Service Manual page 5

Procedures for removal and installation of printed circuit board and motor assemblies

Hide thumbs Also See for LX200 Classic:

Static Electricity can damage the electronics of your telescope. Review the section on

Static Electricity prevention and electronics handling before

1. Check the back of the circuit board for nylon standoff washers which are glued

over the mounting holes to insulate the PCB from the base. If the washers are

missing the electrical circuits on the board will contact the metal base and short

circuit the board.

2. Align the PCB with the mounting holes in the drive base.

o Install the grounded mounting screw (to the left of the 34 pin connector).

o Install the rest of the mounting screws.

3. Resistor Assembly mounting.

o Clean the surface of the sidewall of the base where the resistor assembly was

formally mounted with solvent. Remove all traces of tape and grease.

o Place each of the resistors into a channel of the mounting clip and center the

mount on the resistor so there is equal overhang.

o Open the bag of Thermal Joint Compound (Thermal Grease) and apply a bead

to each ceramic resistor on the surface which mounts to the base.

o Peel the backing off the double-sided tape on the mounting clip and press the

clip assembly onto the wall of the base. Make sure the clip assembly is down

far enough tat the wires from the resistors have clearance with the cover plate.

o If the double sided tape won't hold the clip mount in place apply a bead of

Silicone Adhesive between the clip and the drive base wall.

4. Gather the wires of the resistor assembly together and slide them under the

aluminum heat sink and through the gap between the two cable connectors on the

PCB.

5. Install the 34 Conductor Front Panel Ribbon cable.

connector for correct placement as it is easy to misalign this connection. YOU

CAN DAMAGE the PCB if this connection is

6. Install the 7 pin R.A. motor connector.

7. Spread a thin coat of Thermal Joint Compound over the surface of the Aluminum

Heat Sink.

8. Replace the drive base cover, including the two 1/16" button head hex (Allen)

screws which secure the heat sink to the base plate.

Printed Circuit Board (PCB) Installation

WARNING

proceeding.

DOUBLE CHECK this

INCORRECT.