, Motorola, HT1000, JT1000, MT2000, MTS2000, and Handie-Talkie
are trademarks of Motorola, Inc.
© 1997 by Motorola
Radio Products Group
Headset Adapter Cable NKN6498
Introduction NKN6498
The NKN6498 Headset Adapter Cable is an accessory for Motorola portable
two-way radios. Also available is an NMN1020, which combines the
NKN6498 and an NMN6050. The adapter cable, used in conjunction with
Accessory Adapter BDN6676 (a 3.5mm connector), allows a Safety Helmet
Headset (NMN6050) to be used with HT 1000, JT 1000, MT 2000, MTS 2000,
or MTX Series radios.
Description
The NKN6498 Headset Adapter Cable, with BDN6676 Accessory Adapter,
includes a push-to-talk (PTT) switch, a microphone amplifier circuit, and a
bayonet-type socket for connection to the headset. The BDN6676 provides
Figure 1: Headset Adapter Cable Figure 2: Normal Transmit Position
Adapter
Cable
3.5mm
PTT
Radio
Accessory
Adapter
BDN667
for
HT1000™, JT1000
®
, MT2000™, MTS2000™,
and MTX Series Handie-Talkie
®
Portable Radios
Instruction Sheet for Headset Adapter Cable NKN6498
2
connection to the radio universal connector. The headset is fitted to the hel-
met (see instruction sheet with the applicable headset for details) and its cord
is secured to the user with a cable clothing clip provided. The radio, with
adapter PTT switch, is typically worn on the belt (see Figure 2).
When the adapter cable and accessory adapter are connected to each other
and then to the radio (see Figure 1), the radio speaker becomes disabled.
Receive messages are routed to the headset only. The headset microphone
becomes active for transmitting a reply message when the accessory adapter
PTT is pressed.
Note:
Do not transmit using the radio PTT, as this will enable the radio
front cover microphone rather than the headset microphone.
Installation And Use
Refer to the applicable radio operating instructions.
To use the radio with the headset, follow this procedure:
1. Connect the NKN6498 adapter cable to the BDN6676 accessory
adapter by screwing them together until hand tight.
2. Attach the BDN6676 accessory adapter to the radio external acces-
sory connector.
3. Connect the headset Plug to the socket end of the cable adapter.
4. Turn the radio on. Receive messages will be heard in the headset ear-
piece. Reply to a received message by pressing the PTT switch on the
accessory adapter and talk into the headset microphone.
Note:
Disconnecting the headset from the adapter cable will not make mes-
sages return to the radio speaker. To restore messages to the radio
speaker, remove the accessory adapter from the radio or unscrew the
adapter cable.
Maintenance
Note:
The headset adapter cable is serviceable by unscrewing the housing
from the bayonet-type socket. To gain access to the adapter cable
internal parts, use the procedure outlined in the disassembly/reas-
sembly paragraphs that follow.
Disassembly/Reassembly
Refer to figure 3 and become familiar with the parts before performing any
disassembly/reassembly.
Note:
Care must be taken during disassembly/reassembly to avoid deform-
ing the bayonet-type connector (item no. 8) or damaging the hous-
ing surface (item no.3).
Instruction Sheet for Headset Adapter Cable NKN6498
3
Disassemble the adapter cable
using two shop rags and two gas-
type pliers. Attach the headset plug onto the adapter bayonet-type
socket so as to stabilize the adapter and protect the bayonet-type
connector from being deformed. Use a shop rag around the headset
plug and another shop rag around the housing (item no. 3) to pro-
tect the cable adapter components from the pliers jaws marks. Grasp
the headset plug with one plier and the housing with the other plier.
Unscrew the socket assembly (item nos. 7 and 8) from the housing
(item no. 3). The pc board assembly (item no. 6) is now accessible.
Reassemble the adapter cable
in the reverse order of disassembly. Make
sure that the pc board is seated into its mating groove in the adapter collar
(item no. 7) to ensure that the wires do not get twisted-up during reassembly.
And, make sure that the adapter cable is attached to the headset plug to pro-
tect the bayonet-type connector from being deformed.
Replacement Parts
Figure 3: Adapter Cable Exploded View
1
2
3
4
5
6
7
8
Exploded View Parts List
Item
No.
Motorola
Part No.
Description
1 3005741Z01 ADAPTER
2 4205370R03 STRAIN
RELIEF
3 1505376U01 HOUSING
4 0505432U01 EYELET
5 4210217A02 TIE WRAP
6 0105955T60 PC BOARD
ASSY.
7 4305368U01 COLLAR
8 2805366U01 CONNECTOR
To order replacement parts, or for war-
ranty information, contact Motorola
Americas Parts Division (APD) at
1-800-422-4210 or 1-847-538-8023.
Instruction Sheet for Headset Adapter Cable NKN6498
4
68P81085C84-O
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