LBI-33057
5
FRONT AND REAR COVER
SEPARATION
Lay the radio face down and loosen the four (4)
TORX
screws (A) on the back of the radio; complete
screw removal is not necessary. See Figure 1. Separate
the covers by carefully lifting the Rear Cover Assembly
straight-up to avoid bending the connector pins between
the RF and Control Boards.
When reassembling the unit, verify the rubber gasket
surrounding the perimeter of the cover is in good condi-
tion and it is in the groove. Also verify the connector pins
align properly. For proper operation, the screws should
be tightened so there is no gap between the covers. It is
recommended that the top screws be tightened first while
squeezing the radio together to ensure the gap is com-
pletely closed. The bottom screws can then be tightened.
Figure 1 - Front and Rear Cover Separation
RF BOARD ACCESS
Holes are located in the RF Board shield for align-
ment of the Reference Oscillator (U3), Modulation Bal-
ance pot (R18), VCO Modulation pot (R19), 2nd Local
Oscillator Adjustment (T1), and the Quadrature Detector
Adjustment (T2). See Figure 2. To align these items,
shield removal is not necessary.
If removal of the RF Board from the case is neces-
sary, first remove the UDC antenna jack and the top RF
antenna jack with appropriate spanner wrenches. Next,
remove the five (5) Torx screws (B) that secure the shield
then lift and remove the shield. Remove the two (2) re-
maining Torx screws (C) near the Power Amplifier
Module. The RF Board and eggcrate casting can now be
lifted from the Rear Cover to gain access to the chip
component side of the board.
Figure 2 - RF Board Access
