Icom IC-91A Service Manual page 42

• BOTTOM VIEW
(UT-121 ( Optional Product ; CODEC UNIT for IC-91AD))
23 1
J1
24 2
to LOGIC unit J400
H35 H30 H25 H20 H15 H10 H5
• BOTTOM VIEW (VCO UNIT)
V20
V15
J1
2 GND
VVCO3
VLV VSHIFT
GND BCVCO3
V10
MOD
GND PLLOUT
UVCO3
16 ULV LOOUT
to RF unit J800
V5
V0
H20 H15 H10 H5 H0
• BOTTOM VIEW (MAIN UNIT)
VOL/DIAL
V20
V15
V10
V5
V0
H0
H50 H45 H40 H35 H30 H25
• BOTTOM VIEW (RF UNIT)
BCLV 1
GND
GND
GND
15
H50 H45 H40 H35 H30 H25
V50
V45
V40
V35
V30
V25
V20
V15
15
J703
V10
V5
16
to RF unit J1001
V0
H20 H15 H10 H5 H0
V50
V45
V40
V35
V30
V25
V20
V15
V10
V5
V0
H20 H15 H10 H5 H0
• BOTTOM VIEW (LOGIC UNIT)
DATA
MC300
1
30
LOGIC unit
SP1
INTSP
W2
GND
W3
H50 H45 H40 H35 H30 H25
1 23
J400
2 24
to CODEC unit J1
10 - 2
V90
J401
1 GND
EXTMIC
AFO
V85 INTSP
AAF
CLONE
ANOIS
DIUD
V80
BNOIS
DICK
BRSSI
VOL
BAF
V75
S-LV
+3V
INTPTT
ATONE
DAFOUT
V70
BTONE
CHG
IOSTB3
TTEMP
IOSTB2
V65
UNLK
BPS
DASTB1
BPLSTB
V60 IOSTB1
REFMOD
TXC
APLLSTB
HV
V55
PLLDATA
SQL
+5.5V
GND
MOD
V50
DATA
VCC
40 CK
to MAIN
unit J702
V45
V40
V35
V30
V25
V20
V15
V10
V5
V0
H20 H15 H10 H5 H0