Service manual

3 ASSEMBLY INSTRUCTIONS

3.1 RD68 Chassis Pre-Assembly

The main transmitter and receiver and second receiver PCBs are a

matched pair and replacement of either requires the tuning of both to be

checked and adjusted as necessary. Position the PCB over the Chassis.

Apply a small amount of Hellerman sleeving oil to the part of the Red and

Black power and the red and blue NMEA leads inside the chassis, to

provide lubrication and facilitate withdrawal from the chassis as the board

is set down. Ensure that the 2 copper tags from the washer on the

Antenna socket are standing up clear and insert the tinned copper wire

from the rear of the Antenna socket up through the plated hole in the

board. Fit the PCB into the chassis, carefully pulling the 4 leads through

the grommet to remove excess from the chassis interior. Locate the PCB

over the ribs in the chassis and push down to position the PCB flat into

the casting. When the board is correctly fitted, refer to drawing No

E03848 and fit 2 - M3 X 10 screws 200048 into the front of the chassis to

secure the heatsink in place, do not fully tighten these screws at this

stage .

Fit 1 washer 200081 onto each of the 2 screws M3 x 16mm 200200, and

fit into the 2 holes at the back of the chassis. When all 4 screws are in

place, lightly press down on the front part of the PCB until the front panel

connectors are clearly visible and permit engagement of the front panel

without interference. (See drawing below)