Icom HM-169 Service Manual page 12

• MAIN-B UNIT (for [HM-170GP], [HM-175GPS])
MICROPHONE
CHASSIS UNIT
GPS ANTENNA
ANT 3.3V
Serial LELEV
TX SHIFTER
GPS IC13, IC6
Serial
RX
PPS Sleep
IC4
D4
PTT
(HM-175GPS)
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RIPPLE
FILTER
(HM-170GP)
Q3, C14
MIC MIC
AMP
MUTE
IC2
IC14, Q6
(HM-175GPS)
+3.3V
SWITCHING
REG
IC8, Q5, D5, L3
LEVEL
SHIFTER
D6
(HM-170GP)
IC11
(HM-175GPS)
RESET
Q4
(HM-175GPS)
GPS LED
ON/OFF DRIVER
IC9, IC10
(HM-175GPS)
(HM-175GPS)
(HM-170GP)
6 - 2
SPEAKER
(HM-170GP) (HM-175GPS)
1 SP-
2 SP+
3 Vcc
4 MIC
5 NMEA
6 XTXD
7
GND
8 PTT
(HM-175GPS)
+3.3V
SW UNIT (HM-175GPS)
+3.3V
DS1
SW1
SW UNIT (HM-170GP)
SW1
SP-
SP+
Vcc
MIC
NMEA
SENS
GND
nc