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OPTIONS
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When connecting the optional HM-174 WATERPROOF 
SPEAKER-MICROPHONE, HM-175GPS GPS WATERPROOF 
SPEAKER-MICROPHONE or OPC-1799 DATA COMMUNICATION 
CABLE, OPC-1797 CONNECTION CABLE to the [DATA/SP/MIC] 
jack, follow the procedure below.
• Connecting to the [DATA/SP/MIC]  jack
q Remove the rubber cap. from the [DATA/SP/MIC] jack.
w Orient the connector’s flat face and the [DATA/SP/MIC]
jack’s flat face in same direction, (Verifying  triangular 
mark) then insert it tightly.
e Rotate the threaded connector shell clockwise to tighten 
the connector.
• Disconnecting from the [DATA/SP/MIC]  jack
q Rotate the threaded connector shell counter-clockwise to 
loosen the connector.
w Disconnect the cable from the [DATA/SP/MIC] jack.
e Reattach the rubber cap tightly to the [DATA/SP/MIC] jack.
■ Connecting to the [DATA/SP/MIC] jack 
CAUTION!:
Turn power OFF the transceiver before connecting/
disconnecting cable to/from the [DATA/SP/MIC] jack.
Rubber cap
[DATA/SP/MIC] jack
[DATA/SP/MIC] jack (Upside view)
Flat face
Triangular mark
Connector (Side view)
Flat face
Triangular mark
Rotate the fix screw tighten.
No Sound from the inside 
speaker when connecting 
OPC-1797.