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MTH500 Portable Radio Basic Service Manual - MAINTENANCE
Removing and Installing the Keypad and LCD Boards
Recommended tools: mini flat-tip screwdriver
To remove the keypad and LCD boards from the unit:
(See Figure 6)
1.
2.
3.
4.
5.
6.
7.
8.
To install the keypad and LCD boards:
1.
2.
3.
4.
5.
Remove the back housing, refer to "Removing and Installing the Back Housing" on
page 32.
Place the unit facing down on the work area.
Open the Personal Hands-Free Kit (PHF) jack cover (See Figure 5).
Using the screwdriver, remove the chassis assembly including the main board, key-
pad board and LCD board, out from the unit.
Place the chassis assembly, with the keypad and LCD boards facing down, on the
work area.
Remove the main board from the chassis assembly.
Insert the screwdriver into one of the slots in the upper side of the chassis assembly,
above the LCD board, and gently push the boards out from the chassis assembly.
According to the board to be replaced, open the required Zero Insertion Force (ZIF)
connector, release the flat cable and the board.
Place the keypad and LCD boards on the work area so that the ZIF connectors are fac-
ing up.
CAUTION:
Care must be taken when installing the keypad and LCD boards on the
chassis. Failure to comply may result in tear of the flat cable between
the two boards.
Insert the flat cable into the ZIF connectors and close the connectors doors until a
click is heard.
Insert the LCD board between the two snags at the sides of the chassis assembly.
Push the LCD board down until it snaps into location.
Verify that the chassis center guide pin is properly located inside the hole in the LCD
board and that the snag at the top of the chassis is inserted into the slot of the board.
35
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