Section Vi. Disassembly And Reassembly; General; Disassembly To Board Level - Motorola MTX Series Service Manual

SECTION VI. DISASSEMBLY AND REASSEMBLY

!
THIS RADIO CONTAINS STATIC-SENSITIVE DEVICES.
DO NOT OPEN THE RADIO UNLESS PROPERLY
GROUNDED. TAKE THE FOLLOWING PRECAUTIONS
WHEN WORKING ON THIS UNIT.
1. Store and transport all complementary metal-oxide
semiconductor (CMOS) devices in conductive material
so that all exposed leads are shorted together. Do not
insert CMOS devices into conventional plastic "snow"
trays used for storage and transportation of other semi-
conductor devices.
2. Ground the working surface of the service bench to pro-
tect the CMOS device. We recommend using the
Motorola Static Protection Assembly (part number
0180386A82), which includes a wrist strap, two ground
cords, a table mat, and a floor mat.
3. Wear a conductive wrist strap in series with a 100k
resistor to ground. Replacement wrist straps that con-
nect to the bench top covering are Motorola part
number RSX-4015.
4. Do not wear nylon clothing while handling CMOS
devices.
5. Neither insert nor remove CMOS devices with power
applied. Check all power supplies that are to be used
for testing CMOS devices to be certain that there are no
voltage transients present.
6. When straightening CMOS pins, provide ground straps
for apparatus used.
7. When soldering, use a grounded soldering iron.
8. If at all possible, handle CMOS devices by the package
and not by the leads. Prior to touching the unit, touch an
electrical ground to remove any static charge that you
may have accumulated. The package and substrate
may be electrically common. If so, the reaction of a dis-
charge to the case would cause the same damage as
touching the leads.
A. General
Since this product disassembles and reassembles
without the use of any screws, it is important for the
technician to pay particular attention to the snaps and
tabs, and how parts align with each other.
In the disassembly/reassembly procedure, the num-
bers in parentheses refer to call-out numbers in the
referenced figures.
CAUTION
NOTE
B. Disassembly to Board Level
1. Turn off the radio.
2. Remove the battery (see Figure 40-4).
a. Hold the radio such that the battery is tilted
down.
b. Press down on the two battery-release levers.
c. With the release levers pulled down, the top of
the battery will fall away from the radio.
d. Remove the battery completely from the radio.
MAEPF-22524-A
Figure 40-4.
3. Loosen the antenna by turning it in a counterclock-
wise direction, and remove it from the radio.
4. Remove the volume on/off knob and the channel
selector switch knob by pulling them off their
respective switch shafts.
Both knobs slide on and off but fit very snug on their
respective switch shafts. A small flat blade screwdriv-
er may be necessary to help pry the knobs loose.
Take care not to mar the surrounding radio surface.
NOTE
17