Icom HM-169 Service Manual page 11

SECTION 6
• MAIN-A UNIT (for [HM-169], [HM-174])
REG
+3.6V
IC1
(HM-169)
MICROPHONE
MIC MIC
AMP
MUTE
IC2
IC3, Q3
(HM-169/HM-174)
PTT
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BLOCK DIAGRAMS
SPEAKER
(HM-169) (HM-174)
1
SP-
2 SP+
3 Vcc
4 MIC
5
6
7 GND
8 PTT
(HM-169/HM-174)
SP-
SP+
Vcc
MIC
N/C
SENS
GND
N/C
6 - 1