Motorola NMN6128B User manual

(AA) MOTOROLA INC. REMOTE SPEAKER
MICROPHONE
For SABER™ Handie-Talkie® Portable Radios
1. DESCRIPTION
The Model NMN6128B Remote Speaker
Microphone includes aspeaker, amicrophone, a
push-to-talk (PTT) switch and associated circuitry.
Acable, terminated with aspecial plug, is
provided for attaching to the universal connector
on SABER portable radios.
When the remote speaker microphone is
attached to the radio, the speaker in the radio is
disabled, and 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 in the radio. The radio microphone and
PTT switch are still operational, but you can listen
to the radio only through the accessory speaker.
NOTE
Observe safety information in the radio operating
instructions.
2. INSTALLING THE MICROPHONE
a. Remove the antenna from the radio; unscrew
the antenna in the counterclockwise direction.
b. Insert the tab on the microphone's accessory
connector (item 25) into the slot in the radio's
universal connector.
c. Pivot the accessory connector toward the
radio until its contacts mate with those on the
universal connector, and its mounting screw lines
up with the universal connector's threaded hole.
Then, start the mounting screw in the hole.
d. Slide the accessory bracket (item 26) down
over the radio's antenna bushing nut.
e. Insert the antenna adapter (item 4) into the
threaded hole in the antenna bushing nut, and
tighten it firmly (recommended torque is 10
in. Ib.).
f. Firmly tighten the accessory connector's
mounting screw (recommended torque is 4
in. Ib.).
®,Motorola, SABER, and Handie-Talkie are trademarks of Motorola Inc.
©1988 by Motorola Inc., All Rights Reserved,
MODEL NMN6128B, COILED CORD
g. Replace the antenna by screwing it into
the adapter.
3. OPERATION
a. While listening to the accessory speaker, turn
the radio on and operate it as explained in the
operating instructions supplied with the radio.
b. The microphone will perform best if it is worn
as shown in Figure 1.
MAEPF-17335-O
Figure 1.
4. HANDLING PRECAUTIONS
To avoid damage to circuits, observe the
following handling, shipping, and servicing
precautions.
a. Prior to and while servicing aremote 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 may have
accumulated on the person doing the service.
NOTE
Wearing aconductive wrist strap (Motorola No. RSX-
4015A) will minimize static buildup during servicing.
WARNING
When wearing aconductive 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.
Instruction Manual
68P81107C36-0
Portable Products Division, 8000 W. Sunrise Blvd., Ft. Lauderdale, FL 33322-9947
Printed in U.S.A. 11/88

b. Whenever possible, avoid touching any
electrically conductive part of the unit with your
hands.
c. When servicing aunit, avoid carpeted areas,
dry environments, and certain types of clothing
(silk, nylon, etc.) because they contribute to static
buildup.
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 aconductive surface, such as
asheet 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 at the same time as other electrical circuits.
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 ff 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.
5S. 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 remote speaker
microphone is required, do not reassemble it
without doing the following (numbers in
parentheses refer to item numbers in the
exploded view.
eRemove the O-Ring (14) from the cover
assembly (8).
eInspect the seal areas around the housing
(1) and the cover (8) for foreign material
which might prevent the O-ring from
sealing property.
eInspect O-ring (14) and both cover screw
O-rings (10). If any of these are split,
cracked, or damaged in any way, discard
and replace them.
elf the main printed circuit board (3) is
removed, remove the speaker spacer (19)
and inspect the membrane of the seal pad
(20} for tears or holes. If the membrane is
damaged, remove it, being careful to
remove all old adhesive, and replace it with
anew seal pad.
NOTE
When placing the seal pad (20), 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).
TORQUE SPECIFICATIONS
TORQUE TORQUE
APPLICATION BIT NO.
(IN. LBS.)
Back Cover Screws 6680321878
PC Board Screws 6680321B78
6680321B78Pocket Clip Screw
Antenna Adapter 10 6680370B90
Accessory Connector
Mounting Screw 6680321B78
6
4
4
4
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 agallon of
water).
2
b. Whenever possible, avoid touching any
electrically conductive part of the unit with your
hands.
c. When servicing aunit, avoid carpeted areas,
dry environments, and certain types of clothing
(silk, nylon, etc.) because they contribute to static
buildup.
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 aconductive surface, such as
asheet 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 at the same time as other electrical circuits.
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 ff 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.
5S. 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 remote speaker
microphone is required, do not reassemble it
without doing the following (numbers in
parentheses refer to item numbers in the
exploded view.
eRemove the O-Ring (14) from the cover
assembly (8).
eInspect the seal areas around the housing
(1) and the cover (8) for foreign material
which might prevent the O-ring from
sealing property.
eInspect O-ring (14) and both cover screw
O-rings (10). If any of these are split,
cracked, or damaged in any way, discard
and replace them.
elf the main printed circuit board (3) is
removed, remove the speaker spacer (19)
and inspect the membrane of the seal pad
(20} for tears or holes. If the membrane is
damaged, remove it, being careful to
remove all old adhesive, and replace it with
anew seal pad.
NOTE
When placing the seal pad (20), 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).
TORQUE SPECIFICATIONS
TORQUE TORQUE
APPLICATION BIT NO.
(IN. LBS.)
Back Cover Screws 6680321878
PC Board Screws 6680321B78
6680321B78Pocket Clip Screw
Antenna Adapter 10 6680370B90
Accessory Connector
Mounting Screw 6680321B78
6
4
4
4
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 agallon of
water).
2

TPLF-3755-0
Electrical Parts List
Fcn NEW
GND
CRN
mic ero Bry er BLU+GRN
qo GNP
NOTE:
|. For optimum performance, order replacement diodes, and circuit
modules by Motorola part number only.
LSI
560n LO,
BLK
MAIN BOARD ON RADIO
>a
30pF O22uF P6 ON RADIO
WHT |!
ut C2
|iREMOTE |
+
VR GRN TO UNIVERSAL
L2 C
29uH ON RADIO
ACCESSORY
PURPLE/WHT -> YEL /WHT CONNECTOR
|
PTT \SI
!
L
PTT BOARD
|AEPF-19375-0
REFERENCE MOTOROLA
SYMBOL PART NO. DESCRIPTION
REP
CAPACITOR, Fixed: pF15%; 63V
unless stated
C1 2105454G47 30; N150
C2 2182877B55 100
C3 2184008H19 .022uF
CORE:
E7605530M01 Ferrite Bead
COIL, RF: unless stated
L1,2 2482723H28 Choke, .29uH
L3 thru 5Inductor, Chip, 560nH
(Not Field Repairable)
SPEAKER:
LS1 5005910P03 13/4"
MICROPHONE:
MK1 5005227J02 Microphone
SWITCH:
$1 3905834K05 Dome, PTT
CIRCUIT MODULE: See Note |
ul 5105469E47 IC, Voltage Reference Diode,
1.235V; Type LM285-Z1.2
DIODE: See Note |
VA1, 24883461E26 Zener, 23.8V
NONREFERENCED ITEMS
8405213501 PCB, Flexible
8405296R01 PRINTED CIRCUIT BOARD, PTT
8405297R01 PRINTED CIRCUIT BOARD, Main
PCB, Flexible, Remote
(Not Field Repairable)
4PFE Sr
BLU
CONNECTOR
560nH
RED
560nH
MKI
7
3
TPLF-3755-0
Electrical Parts List
Fcn NEW
GND
CRN
mic ero Bry er BLU+GRN
qo GNP
NOTE:
|. For optimum performance, order replacement diodes, and circuit
modules by Motorola part number only.
LSI
560n LO,
BLK
MAIN BOARD ON RADIO
>a
30pF O22uF P6 ON RADIO
WHT |!
ut C2
|iREMOTE |
+
VR GRN TO UNIVERSAL
L2 C
29uH ON RADIO
ACCESSORY
PURPLE/WHT -> YEL /WHT CONNECTOR
|
PTT \SI
!
L
PTT BOARD
|AEPF-19375-0
REFERENCE MOTOROLA
SYMBOL PART NO. DESCRIPTION
REP
CAPACITOR, Fixed: pF15%; 63V
unless stated
C1 2105454G47 30; N150
C2 2182877B55 100
C3 2184008H19 .022uF
CORE:
E7605530M01 Ferrite Bead
COIL, RF: unless stated
L1,2 2482723H28 Choke, .29uH
L3 thru 5Inductor, Chip, 560nH
(Not Field Repairable)
SPEAKER:
LS1 5005910P03 13/4"
MICROPHONE:
MK1 5005227J02 Microphone
SWITCH:
$1 3905834K05 Dome, PTT
CIRCUIT MODULE: See Note |
ul 5105469E47 IC, Voltage Reference Diode,
1.235V; Type LM285-Z1.2
DIODE: See Note |
VA1, 24883461E26 Zener, 23.8V
NONREFERENCED ITEMS
8405213501 PCB, Flexible
8405296R01 PRINTED CIRCUIT BOARD, PTT
8405297R01 PRINTED CIRCUIT BOARD, Main
PCB, Flexible, Remote
(Not Field Repairable)
4PFE Sr
BLU
CONNECTOR
560nH
RED
560nH
MKI
7
3

25
10
24
12
15
16
19
20
22
/CEPF-19376-0
TPLF-3756-0
Exploded View Parts List
ITEM MOTOROLA
NO. PART NO. DESCRIPTION
0105954S34 ASSEMBLY, Housing/Cord
(not field repairable)
1405490001 BOOT, Microphone
See Note PRINTED CIRCUIT BOARD, Main
4305270901 ADAPTER, Antenna
5005227002 MICROPHONE (MK1)
0300139047 SCREW, Cutting
7582154D33 PAD, Speaker
1505954P78 ASSEMBLY, Cover (not field repairable)
3305216K39 LABEL, Kit Number
10 3205082E03 GASKET, O-Ring (2 req'd)
11 0382210E19 SCREW, Cover-Captive; #4-40 (2 req'd)
12 0300139982 SCREW, Machine, Phil Bin;
#2-56 x.188" (4 req'd)
13 0105959N54 ASSEMBLY, Belt Clip
14 3205082E63 GASKET, O-Ring
15 3905834K05 DOME, PTT (S1)
16 3205264L06 SEAL, PTT
17 See Note PRINTED CIRCUIT BOARD, PTT
18 5005910P03 SPEAKER (LS1)
19 4305407R01 SPACER, Speaker
20 3205190R01 PAD, Seal
21 4505211 R02 LEVER, PTT
22 3305269R01 LABEL, Nameplate
23 7505136L03 PAD, Latch (2 req'd)
24 See Note PRINTED CIRCUIT BOARD, Flexible
25 0405465C01 WASHER, Plastic (2 req'd)
1
2
3
4
5
6
7
8
9
NOTE Refer to Electrical Parts List for part number and description.
4
25
10
24
12
15
16
19
20
22
/CEPF-19376-0
TPLF-3756-0
Exploded View Parts List
ITEM MOTOROLA
NO. PART NO. DESCRIPTION
0105954S34 ASSEMBLY, Housing/Cord
(not field repairable)
1405490001 BOOT, Microphone
See Note PRINTED CIRCUIT BOARD, Main
4305270901 ADAPTER, Antenna
5005227002 MICROPHONE (MK1)
0300139047 SCREW, Cutting
7582154D33 PAD, Speaker
1505954P78 ASSEMBLY, Cover (not field repairable)
3305216K39 LABEL, Kit Number
10 3205082E03 GASKET, O-Ring (2 req'd)
11 0382210E19 SCREW, Cover-Captive; #4-40 (2 req'd)
12 0300139982 SCREW, Machine, Phil Bin;
#2-56 x.188" (4 req'd)
13 0105959N54 ASSEMBLY, Belt Clip
14 3205082E63 GASKET, O-Ring
15 3905834K05 DOME, PTT (S1)
16 3205264L06 SEAL, PTT
17 See Note PRINTED CIRCUIT BOARD, PTT
18 5005910P03 SPEAKER (LS1)
19 4305407R01 SPACER, Speaker
20 3205190R01 PAD, Seal
21 4505211 R02 LEVER, PTT
22 3305269R01 LABEL, Nameplate
23 7505136L03 PAD, Latch (2 req'd)
24 See Note PRINTED CIRCUIT BOARD, Flexible
25 0405465C01 WASHER, Plastic (2 req'd)
1
2
3
4
5
6
7
8
9
NOTE Refer to Electrical Parts List for part number and description.
4

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I hope this service manual is of use to you. Motorola does
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If something is incorrect here, or unreadable please reach
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This was captured on a Canon DR-G2140 scanner which is ~
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If you have a hard to find/out of print manual and would
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Thank you,
Bryan Fields, W9CR
[email protected]