![background image](http://html.mh-extra.com/html/icom/ic-m504/ic-m504_service-manual_612820026.webp)
H5
H10
H15
H20
H25
H30
H35
H40
H45
H50
H55
H60
H65
H70
H75
H80
H85
H90
H95
H100
H0
V5
V10
V15
V0
V25
V30
V35
V20
V45
V50
V55
V40
V65
V60
1 2
to CHASSIS
unit W3
J5
VCC
GND
RCV
20
19
2
1
to MAIN
unit J2
J2
ATT
BPFV
GND
NC
MOD
DETM
SQL
UNLK
PCK
SEND
H/L
TMUTE
TXDET
GND
GND
DET70
S5V
PSTB
PDATA
SP+
1
2
39
40
to LOGIC
board J1
J1
SP-
VCC
NC
GND
RCV
VOL1
VOL2
FOG
EVCK
BPFV
SQL
TXDET
MICG
MIC
EXTRXD
UNLK
PSTB
EXTSTB
OPSTB
SP+
SP-
HV
S5V
PWRON
SEND
GND
BEEP
FOGC
EVDATA
WXDEC
DSDM
DSD70
DSCENC
ICF3
EXTTXD
PDATA
PCK
EXTOE
OPTIN
6
1
to CHASSIS
unit W3
J6
ICF3
EXTRXD
EXTTXD
PTTC
MICG
AF/MIC
2 1
to CHASSIS
unit W1
J11
SP
-
SP+
HAILO-
2
1
to CHASSIS
unit W2
J12
HAILO+
DETO
14
13
2
1
to option
SCRAMBLER unit
J3
MICO
DETI
MICI
OPSTB
SDATA
SCK
GND
GND
GND
SCON
OPTIN
GND
5V
HV
GND
to MAIN
unit J1
to CHASSIS
unit W1
GND
GND
HV
HV
SECTION 9
BOARD LAYOUTS
9 - 1
9-1 AF UNIT
• TOP VIEW
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
H0
V5
V10
V15
V0
V25
V30
V35
V20
V45
V50
V55
V40
V65
V60
PD
A
T
A
19
1
20
2
to AF unit J2
J2
PSTB
S5V
DET70
GND
GND
TXDET
TMUTE
H/L
SEND
PCK
UNLK
SQL
DETM
MOD
NC
GND
BPFV
AT
T
RCV
IC3
CHASSIS MP22
GND
CHASSIS J1
ANT
ANT
9-2 MAIN UNIT
• TOP VIEW