6 - 6 MTP700/MTP750 Portable Radios / Basic Service Manual MAINTENANCE
4. Remove the Talkgroup knob off its shaft.
Figure 6-2 Talkgroup Knob Removal
5. Separate the chassis from the internal electronics front cover assembly as follows:
a. Insert the chassis opener, or similar instrument, in between the thin retaining wall
and the chassis at the bottom of the radio. Do not mar the O-ring sealing under-
neath the radio housing.
b. Slowly pry the bottom of the chassis from the cover by pushing the chassis opener
down, and prying the handle of the tool over and behind the base of the radio.
This prying action forces the thin inner plastic wall toward the base of the radio,
releasing the two chassis base tabs.
Figure 6-3 Chassis Removal
NOTE
The knob slides on and off. However, it is supposed to fit very tightly on its shaft.
CAUTION: Marring the front cover O-ring sealing area will prevent the radio from sealing properly.
NOTE
Flexible ribbon circuits (flexes) connecting the front cover assembly and the chassis prevent
you from completely separating the two units. Display radios and radios with option boards
have three flexes.
Talkgroup Knob
Radio Chassis
!
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