![background image](http://html.mh-extra.com/html/icom/ic-m504/ic-m504_service-manual_612820029.webp)
H5
H10
H0
V5
V10
V15
V0
• BOTTOM VIEW (DIAL BOARD)
9 - 4
H5
H10
H0
V5
V10
V0
• BOTTOM VIEW (SQL BOARD)
H5
H10
H0
V5
V10
V0
• BOTTOM VIEW (VR BOARD)
H5
H10
H15
H20
H25
H30
H35
H40
H45
H0
V5
V10
V15
V0
V25
V30
V35
V20
V45
V50
V55
V40
V65
V70
V60
PTT
• BOTTOM VIEW (HM-126
B/G
)
H5
H10
H15
H20
H25
H30
H35
H40
H45
H50
H55
H60
H65
H70
H75
H80
H85
H90
H95
H100
H105
H110
H115
H120
H125
H130
H135
H140
H145
H150
H155
H0
V5
V10
V15
V0
V25
V30
V35
V20
V45
V50
V55
V40
V65
V70
V75
V60
V80
1 2
to Microphone
HM-126
J6
KEY
GND
1
8
to Microphone
HM-126
J4
NC
PTT
HANG
MICG
MIC
SP
-
NC
AF
1
10
to DIAL, SQL, VR boards
J3
GND
DIALA
DIALB
ENT
S5V
SQL
V
GND
V
OL1
V
OL2
V
OLG
1
to AF unit J1
2
39
40
J1
OPSTB
EXTSTB
PSTB
UNLK
EXTRXD
MIC
MICG
TXDET
SQL
BPFV
EVCK
FOG
V
OL2
V
OL1
RCV
GND
NC
VCC
SP
-
SP+
OPTIN
EXT
OE
PCK
PD
A
T
A
EXTTXD
ICF3
DSCENC
DSD70
DSDM
WXDEC
EVD
A
T
A
FOGC
BEEP
GND
SEND
PWR
ON
S5V
HV
SP
-
SP+
27
1
to LCD
J2
C2
-
V0
V1
V2
V3
V4
CS1B
RESETB
RS
R
W_WR
E_RD
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
GND
VDD
V
OUT
C3+
C3
-
C1+
C1
-
C2+
4
1
to CHASSIS
unit W1
J5
GND
NMEA
O
NMEAI
-
NMEAI+
FRONT unit SP1
• BOTTOM VIEW (LOGIC BOARD)