Motorola Nmn6191b C Nmn6193b C 68p81083c43 B Manual

							DESCRIPTION
The NMN6191B/C and NMN6193B/C Remote
Speaker/Microphones include a speaker, microphone,
and push-to-talk (PTT) switch. Both remote
speaker/microphones include a 3.5mm earphone jack
located on top of the accessory connector. A seal, which
is attached to the accessory connector, is provided to
cover the earphone jack when it is not in use. The
NMN6191B/C Remote Speaker/Microphone includes a
noise-cancelling port that reduces background noise
during transmit.
When the remote speaker/microphone is attached to the
radio, the speaker in the radio is disabled, and the
receiver audio is connected to the accessory speaker.
Similarly, the accessory microphone is connected to the
transmitter, and the accessory PTT switch can now
control the PTT function of the radio. The radio
microphone and PTT switch are still operational, but
since the radio speaker is disabled, you can listen to the
received audio only through the accessory speaker.
PERFORMANCE TEST
General
The speaker/microphone audio performance is designed
to be similar to that of the radio. The transmit audio
sensitivity of the microphone requires slightly louder
voice loudness to produce the same carrier deviation as
the radio. The characteristics described above improve
communications in noisy areas.
Audio test
The speaker/microphone accessory can be checked for
proper performance by comparison with another new or
known-good unit on the radio. Start each of the following
two tests with the new, or known-good unit, on the radio.
1. Microphone - Transmit to a communications monitorwhile voicing a tone or the word Ôfour.Õ The
speaker/microphone should be held at a distance
that causes approximately 3kHz deviation. Repeat
these conditions using the speaker/microphone to
be tested. Good units compare to each other within
± 2kHz deviatio
n.
2. Speaker - Using the communications monitor,generate an RF signal to the radio. Set the
modulation to a 1kHz tone at 3kHz deviation. Set the volume control on the radio to a loud, yet
undistorted, position. Without disturbing any
settings, repeat these conditions using the
speaker/microphone to be tested. Good units should
sound equally loud and undistorted.
HANDLING PRECAUTIONS
To avoid damage to circuits, observe the following
handling, shipping, and servicing precautions.
1. Prior to and while servicing a remote 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 which your body may
have accumulated.
2. Whenever possible, avoid touching any electrically conductive part of the unit with your hands.
3. Because they contribute to static buildup, avoid carpeted areas, dry environments, and certain types
of clothing (silk, nylon, etc.) when servicing a unit.
4. 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.
5. When soldering, be sure the soldering iron is grounded.
6. Prior to replacing circuit components, 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.
REMOTE SPEAKER/MICROPHONE
Models: NMN6191B/C and NMN6193B/C
© 1995, 2000 by Motorola, Inc.
8000 W. Sunrise Blvd., Ft. Lauderdale, FL 33322
Printed in U.S.A. 02/00. All Rights Reserved.and Motorola are trademarks of Motorola, Inc.
Service Manual
68P81083C43-B
Wearing a conductive wrist strap (Motorola No. RSX-
4015A) will minimize static buildup during servicing.
CAUTION
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.
*6881083C43*
!WARNING
! 
						

							7. If the microphone has been exposed to water, shakethe 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.
MAINTENANCE AND REPAIR
If necessary, the external surfaces of the remote
speaker/microphone may be cleaned. Use a 5% solution
of mild dish washing detergent in water (one teaspoon of
detergent in a gallon of water).
Refer to the schematic diagram, the exploded view, and
the parts lists for a better understanding of the parts
availability for these remote speaker/microphones.
Although parts of the cord and connector assembly are
repairable, the speaker/microphone head is not. If a
problem occurs with the speaker/microphone head, it
must be replaced as a complete unit. Separate the
microphone head from the cord and connector assembly
as follows:
1. Pull the rubber strain-relief boot from the base of the microphone head and slide the rubber boot down the
cord away from the microphone head. 2. Pull the gray rubber seal from inside the square base
of the microphone head and slide the seal down the
cord away from the microphone head.
3. Remove the Òphone-likeÓ connector from inside the square base of the microphone.
Use reverse procedure to install a new speaker/
microphone head.
Electrical Parts List TPLF-4197-A
REFERENCE MOTOROLA
SYMBOL PART NO. DESCRIPTION
CAPACITOR, Fixed: 
C1 2113740A73 560pF (for NMN6191B and 93B)
or 2113740A55 100pF (for NMN6191C and 93C)
JACK:
J1 0905100W01 Micro
COIL, RF: unless stated
L1 thru 7 2462587Q44 Choke, 0.56µH
RESISTOR, Fixed: ½±5%; 1/8W
unless stated
R1 0662057C89 3.9k
R2 0662057C83 2.2k
R3 0660076K01 0 ½
2 
						

							3
BLK   OPT B+/(BT PGM SEL)
BRN  SPKR COMM
VIOLET    NO CONN
RED   GND
BLUE  EXT MIC
ORG   OPT SEL 2
GRN   NO CONN
YEL   EXT SPKRPHONE-TYPE
CONNECTOR
ACCESSORY
CONNECTOR
1
5
6
8 4 2
3
NOTE:
NPIN PLACED PIN NOT PLACED
L2
560nH
L1
560nH
L3
560nH
L4
560nH
B+
SPKR COMMON
4
N/C 9 8
1
3 C1
560pF
5
L5
560nH
N/C 13
L6
560nH
L7
560nH
6
2
R1
3.3k
R2
1.5k
EXT MIC
GROUND
PTT/OPT SEL 2
SPKR COMMON EXT SPKR
2
4
3 1
5
R30
ACCESSORY
CONNECTOR PINS
MIC CABLE
BLACK
BROWN
VIOLET
RED
BLUE
ORANGE
GREEN
YELLOW
TO
SPKR/MIC
MAEPF-24952-O
J1
MAEPF-24952-A
*
See Electrical Parts List.*
3.9k
2.2k 
						

							Exploded View Parts List
ITEM MOTOROLANO. PART NO. DESCRIPTION
1ASSEMBLY, Speaker/Microphone Head
0104004J24 (for NMN6191B)
or 0104004J25 (for NMN6193B)
or 0104010J48 (for NMN6191C)
or 0104010J49 (for NMN6193C)
2 4504470J01 PADDLE, PTT
3 7505618V02 KEYPAD, PTT
4 4205823V01 BELT CLIP
5 3305183R91 LABEL, Nameplate
6 ASSEMBLY, Cord and Connector
0104004J26 (for NMN6191B and NMN6193B)
or 0104010J46 (for NMN6191C and NMN6193C)
7 - - - - - - - - - - part of item 13
8 0305731J20 SCREW
9 3205252W01 SEAL, Earphone Jack
NOTE: Refer to electrical parts list for part number and description.
4
11
12
10
13
6 7
8
9
1
2 3
4
5
14
MAEPF-24953-A
10 3205235W01 GASKET
11 6405241X01 BASEPLATE
12 0105953S36 ASSEMBLY, Printed Circuit Board
13 See Note JACK, Micro (J1)
14 3305706X26 NAMEPLATE, NMN6191Bor 3305706X27 NAMEPLATE, NMN6193B
or 3305706X79 NAMEPLATE, NMN6191C
or 3305706X80 NAMEPLATE, NMN6193C
ITEM MOTOROLA
NO. PART NO. DESCRIPTION