Technical Manual

8-2
5. Remove the main seal (58) from around the casting assembly (54).
6. If you are disassembling a model II or III radio, continue with step
7; if you are disassembling a model I radio, skip to step 10.
7. With the front of the radio facing upward, lift the LCD module
(38), with display locator pad (39), up and off of the four locator
posts on the casting (54). Then, flip the LCD module up toward
the top of the radio, revealing the display flex attachment bracket
(42) and the keypad flex attachment bracket (43).
8. Disengage the display flex attachment bracket (42) by prying it up
from the side, releasing the two chassis snaps; note the positioning
of the bracket over the flex’s “finger.” Remove the LCD module
(38) and display flex connector bracket (42) and put them aside.
9. Disengage the keypad flex attachment bracket (43) by prying it up
from the side, releasing the two chassis snaps.
10.Pry all four controller front shield clips (40) upward, alternating
diagonally across the chassis. Remove the controller front shield
(41), with keypad flex assembly (37) (models II and III only) and
clips still attached, from the chassis.
11.Lift the controller board (44) up and away from the chassis.
NOTE: If the radio is equipped with hardware encryption,
insert a small (1/8" wide maximum), flat-bladed
screwdriver between the lower left portion of the
chassis and controller board and gently pry upward
on the controller board. This will free the controller
board/encryption board (45) connection.
12.Lift out the 50-pin (48) and 20-pin (47) compression connectors.
13.Remove the vocoder board shield (46) by inserting a small (1/8"
wide maximum), flat-bladed screwdriver in the removal slot on
the right side of the shield, and prying in a counterclockwise
direction. Once the shield’s retention tab is free of the casting
window, lift the shield out. If the encryption board (45) is
equipped, it will come out with the shield.
14.Turn the casting assembly over and allow the vocoder board (50)
to drop out into the palm of your hand.
15.With the front of the radio facing upward, use your thumb to hold
down the clip (40) that secures the upper left portion of the RF
shield (49), and pry the clip free. Then, release the two snaps on
the right side of the RF shield. Lift the shield out, rotating it
around its top edge.
16.Using the RF board coax disengagement tool or needle-nosed
pliers, carefully unplug the coaxial cable’s connector (55) from the
RF board’s (51) surface-mount connector.
17.Lift the RF board (51) out of the casting assembly. Inspect the
casting to make sure the thermal pad (61) is attached to the
casting. If the pad is attached to the RF board, remove it from the
board. If the pad is in good condition, reattach it to the casting; if
it is not, attach a new pad to the casting and discard the old one.
18.Lift the B+ assembly (52) and B+ seal (53) out of the casting
assembly.