Maintenance - Motorola GP68 Service Manual

Accessory
Remote Speaker Microphone
¥ 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.
¥ If the microphone cartridge is removed from the
unit, place it on a conductive surface, such as a
sheet of aluminium foil which is connected to
ground through 100k ohms of resistance.
WARNING
If the aluminium foil is connected directly to
ground, be cautious of possible electrical
shock from contacting the foil at the same
time as other electrical circuits.
¥ When soldering, be sure the soldering iron is
grounded.
¥ Prior to replacing circuit components or touch-
ing the microphone cartridge, be sure to dis-
charge 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.
¥ Replacement microphone cartridges should be
kept in conductive packaging until they are
placed in unit.
MK1
+
_
+
_
LS1
3-2
L2
C1 C2
L3
C4
Figure 3-2. Schematic Diagram
6881086C09-O
GP68 Portable Radios Service Manual

Maintenance

Refer to the schematic diagram (shown in Figure 3-2), the
exploded view (shown in Figure 3-3), and the parts lists.
Every part in the microphone is identified and illustrated for
assistance in removal and replacement. If necessary, the
external surfaces of the remote speaker microphone may be
cleaned with a 0.5% solution of mild dishwashing detergent
in water (one teaspoon of detergent in a gallon of water).
L1
S1 PTT
C3
L4
2.5 mm plug
(Tip)
2.5 mm plug
(Sleeve)
3.5 mm plug
(Tip)
3.5 mm plug
(Sleeve)
March, 1997