Motorola HT750 Service Manual - Page 30

Detailed Radio Reassembly

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3-10 Maintenance 3.7 Detailed Radio Reassembly 3.7.1 Control Top Reassembly 1. Replace transmit light pipe and control top seal. 2. Peel off the liners from a new control top escutcheon and place it in the recess in the front cover. Press the control top escutcheon firmly against the adhesive. 3.7.2 PTT Reassembly 1. Put the PTT seal in the PTT bezel. 2. Place the bezel top tab in the top slot inside the front cover PTT opening. Slightly bow the bezel so that the bottom tab can fall inside the bottom slot. 3. Press the PTT assembly against the front cover opening. NOTE: Look inside the front cover to make sure the T-tab is fully engaged with the front cover. If necessary, press the T-tab toward the top of the radio until it becomes fully engaged. 3.7.3 Speaker, Microphone, and Universal Connector Flex Reassembly 1. Feed the universal connector tail of the speaker-microphone flex assembly through the opening in the side wall of the front cover. 2. Peel-off the adhesive liner on the back of the universal connector tail of the flex circuit. Attach the flex tail to the front cover using the guide pins for correct alignment. 3. Replace the universal connector escutcheon. Make sure that all the connector openings align with the gold pads on the flex circuit. 4. Align the notch in the speaker at the twelve o'clock position with the tab on the front cover as shown in Figure 3-8. 5. Place the speaker retainer bracket into the hole on the top of the front cover, and bend the retainer down to fit underneath the boss below the speaker. 6. If display, keypad, or keypad option board are not involved, reinsert the microphone and boot into the pocket in the front cover 3.7.4 Keypad, Display, and Keypad/PassPort/Option Board Reassembly 1. If you are replacing the display, use a new double-sided adhesive display pad (item number 17 on the exploded view diagram in paragraph 3-8). 2. Replace the keypad, and the keypad/option board. Make sure the display module flex tail is connected to the connector on the keypad/option board. 3. Insert the "top hooks" of the keypad retainer into the slots below the speaker (above the display) in the front cover. Snap all four of the retainer arm tabs in place in the front cover. NOTE: Pull the speaker-microphone flex circuit out of the way during reassembly. 4. Reinsert the microphone and boot into the pocket in the front cover. 5. Lay the speaker-microphone flex on top of keypad/PassPort/option board retainer.

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3-10
Maintenance
3.7
Detailed Radio Reassembly
3.7.1
Control Top Reassembly
1.
Replace transmit light pipe and control top seal.
2.
Peel off the liners from a new control top escutcheon and place it in the recess in the front cover.
Press the control top escutcheon firmly against the adhesive.
3.7.2
PTT Reassembly
1.
Put the PTT seal in the PTT bezel.
2.
Place the bezel top tab in the top slot inside the front cover PTT opening. Slightly bow the bezel
so that the bottom tab can fall inside the bottom slot.
3.
Press the PTT assembly against the front cover opening.
3.7.3
Speaker, Microphone, and Universal Connector Flex Reassembly
1.
Feed the universal connector tail of the speaker-microphone flex assembly through the opening in
the side wall of the front cover.
2.
Peel-off the adhesive liner on the back of the universal connector tail of the flex circuit. Attach the
flex tail to the front cover using the guide pins for correct alignment.
3.
Replace the universal connector escutcheon. Make sure that all the connector openings align
with the gold pads on the flex circuit.
4.
Align the notch in the speaker at the twelve o’clock position with the tab on the front cover as
shown in Figure 3-8.
5.
Place the speaker retainer bracket into the hole on the top of the front cover, and bend the
retainer down to fit underneath the boss below the speaker.
6.
If display, keypad, or keypad option board are not involved, reinsert the microphone and boot into
the pocket in the front cover
3.7.4
Keypad, Display, and Keypad/PassPort/Option Board Reassembly
1.
If you are replacing the display, use a new double-sided adhesive display pad (item number 17 on
the exploded view diagram in paragraph 3-8).
2.
Replace the keypad, and the keypad/option board. Make sure the display module flex tail is
connected to the connector on the keypad/option board.
3.
Insert the “top hooks” of the keypad retainer into the slots below the speaker (above the display)
in the front cover. Snap all four of the retainer arm tabs in place in the front cover.
4.
Reinsert the microphone and boot into the pocket in the front cover.
5.
Lay the speaker-microphone flex on top of keypad/PassPort/option board retainer.
NOTE:
Look inside the front cover to make sure the T-tab is fully engaged with the front
cover. If necessary, press the T-tab toward the top of the radio until it becomes fully
engaged.
NOTE:
Pull the speaker-microphone flex circuit out of the way during reassembly.