Icom HM-169 Service Manual page 13

SECTION 7
• MAIN-A UNIT (for [HM-169], [HM-174])
CP5 D_GND
CP6
SW
CP7
CP8
2.81V
MICROPHONE
MC 1
R13
EP1
MMZ1608Y102BT
0
AM-627P
PTT
T OFF
ON
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VOLTAGE DIAGRAMS
3.6V
R23
0
(HM-174)
R20 470K
C7
0.0022
R19
47K
ERTJ0EP473J
C4 5
1
4
0.01
3
2
IC2
LMV321IDCK
1.79V 1.79V
R22 (HM-169)
0
IC3
R7
R8
Q3
680
0V
3.56V
7 - 1
To SPEAKER
C21
470P
@3.3V
J1
B8B-ZR-SM4-TF
SP-
1
SP+
2
Vcc
3
MIC
4
XRXD
5
6
GND
7
PTT
8
3.56V
0V