Motorola PRO5450 Panduan Servis Dasar - Halaman 23

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Radio Disassembly — Detailed

CAUTION: Refer to the CMOS CAUTION in paragraph 3.3 before removing the main board.

Be sure to use ESD protection when handling circuit boards.

3. Remove the small O-ring retainers from their slots in the chassis. Note the alignment of the

retainers for reassembly.

4. Remove the O-ring.

5. (VHF, UHF, and lowband only) If required in disassembly, slide off the ground contact from the top

corner boss of the radio chassis.

3.6.3 Keypad and Keypad/Option Board Disassembly

1. If the disassembly of the keypad or the keypad printed circuit board, is required, lift the

microphone ﬂex circuit up, and carefully remove the microphone and its boot from the front cover

pocket as shown in Figure 3-6.

2. Lay this ﬂex circuit to one side.

3. To remove the keypad retainer shield, Insert the tip of a "penknife size," ﬂat blade screwdriver in

the opening at the end of the keypad retainer arm tab. Pry the tab away from the side of the front

cover until it moves past the ledges on the side wall. Repeat this procedure for the four remaining

retainer arm tabs.

4. Note that for the PRO series, with the exception of the PRO9150, the two "top hooks" are still held

underneath the front cover—right below the speaker. Lift the keypad retainer out of the front

cover, then lift and pivot the two hooks out of the front cover.

5. Lift latch on connector located on the keypad board to release the display ﬂex.

6. The keypad/option board and the keypad can be removed without the use of tools

NOTE At this point, the Option Board Installation Procedure should be performed, if

necessary (See paragraph 3.7.8)

Speaker-Microphone

Flex Circuit Tail

Keypad Retainer

Arm Tabs (4)

Retainer

Top Hooks

Figure 3-6. Retainer Removal

Flat Blade

Screwdriver

Retainer

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