Advertisement
III. HANDLING PRECAUTIONS
To avoid damage to circuits, observe the following
handling, shipping, and servicing precautions.
!
Wearing a conductive wrist strap (Motorola No. RSX-
4015A) will minimize static buildup during servicing.
!
WARNING
When wearing a conductive wrist strap, be
careful near high voltage sources. The good
ground provided by the wrist strap will also
increase the danger of lethal shock from
accidentally touching high-voltage sources.
A. Prior to and while servicing a public safety speaker/
microphone, particularly after moving within the service
area, momentarily place both hands on a bare metal,
earth-grounded surface. This will discharge any static
charge your body may have accumulated.
B. Whenever possible, avoid touching any electrically
conductive part of the unit with your hands.
C. Because they contribute to static buildup, avoid
carpeted areas, dry environments, and certain types of
clothing (silk, nylon, etc.) when servicing a unit.
D. All electrically-powered test equipment should be
grounded. Apply the ground lead from the test
equipment to the unit before connecting the test probe.
Similarly, disconnect the test probe prior to removing
the ground lead.
E.
If the microphone cartridge is removed from the unit,
place it on a conductive surface, such as a sheet of
aluminum foil which is connected to ground through
100k ohms of resistance.
!
WARNING
If the aluminum foil is connected directly to
ground, be cautious of possible electrical shock
from contacting the foil and other electrical
circuits at the same time.
F.
When soldering, be sure the soldering iron is grounded.
G. Prior to replacing circuit components or touching the
microphone cartridge, be sure to discharge any static
buildup. Since voltage differences can exist across the
human body, it is recommended that only one hand be
used if it is necessary to touch the microphone cartridge
and associated wiring.
H. Replacement microphone cartridges should be kept in
conductive packaging until they are placed in the unit.
I.
If the microphone has been exposed to water, shake the
unit to remove any residual water from the speaker grille
area. Blow out any residual water from the microphone
grille area before operating the radio; otherwise, the
sound may be distorted until the water has evaporated
from these areas.
2
CAUTION
IV. MAINTENANCE
Refer to the schematic diagram, the exploded view, and
the parts lists. Every part in the microphone is identified and
illustrated for assistance in removal and replacement.
If disassembly of the public safety speaker microphone
is required, do not reassemble it without doing the following
(numbers in parentheses refer to item numbers in the
exploded view).
•
Remove the O-ring gasket (22) from the cover assembly
(16).
•
Inspect the seal areas around the housing (1) and the
cover (16) for foreign material which might prevent the
O-ring gasket from sealing properly.
•
Inspect O-ring gasket (22) and both cover screw O-rings
gaskets (18). If any of these are split, cracked, or
damaged in any way, discard and replace them.
•
If the main printed circuit board (14) is removed, remove
the speaker spacer (27) and inspect the membrane of
the seal pad (28) for tears or holes. If the membrane is
damaged, remove it, being careful to remove all old
adhesive, and replace it with a new seal pad.
When placing the seal pad (28), it is critical that
the small seal pad opening be aligned with the
microphone port in the housing.
•
Tighten all hardware loosened or removed during
disassembly per the values listed in the Torque
Specifications table. Use the recommended torque
driver (RSX-4043A Rototorq Tool or equivalent).
If necessary, the external surfaces of the remote
speaker microphone may be cleaned with 0.5% solution of
mild dishwashing detergent in water (one teaspoon of
detergent in a gallon of water).
TABLE 2. TORQUE SPECIFICATIONS
TORQUE
APPLICATION
(IN. LBS.)
Cover Screws
PC Board Screws
Clip Screws
Toggle Switch Boot
Connector Assembly
Screw
Ear jack Spanner
Antenna Spanner
NOTE
TORQUE
TORQUE
(N•m)
BIT NO.
6
0.68
6680321B78
3
0.34
6680321B78
4
0.45
6680321B78
3
0.34
6680370B99
3
0.34
6680381B69
3
0.34
6680370B89
20
1.13
6680341A61
Advertisement
