Icom ID-31A Service Manual page 35

VCO_MUTE MOD
MUTE
Q21
VCOMOD
3VS,+5V
IC6
UNLK
LOOP
PLL
IC FILTER
3VS PLLDATA
VCOMOD PLLCK
PPS
PLLSTB
REFMOD REFMOD 15.3MHz
X1
FIN
REFCON REFCON
R3
REF
X3
FM-N/DV
Q38
CERAMIC
45.9MHz
BPF
BPF
WN
DET
AGC450
R3
UNLK
RSSI
NOISE
VCO3
LO
VCO
BUFF
AMP
Q32
Q30
Q27,D10,D11,D12
LV DET LV
Q26
VCO3
LPF BUFF
Q29
FM
CERAMIC
BPF
FI1 FI2
W/N
Q36,D15
SW
D16,D18,D19
FM
LIMIT
DET
IC13 D22
SQLOUT
DISCRI
X2
W/N
SW
Q40
WN
R3
R3
REG
3VS
Q24
R3C
3VS
REG
IC10
R3 T5
T5
T5
LO YGR
ATT
BUFF
AMP
SW
Q48 Q39
D13,D14 D20,D21
IC14B
APC
T5 T5
CTRL
PSET
MUTE
SW
Q43
TXMUTE
R3
1st LO
LPF
Q46
R3
46.35 MHz
IF XTAL 1st IF
LIMIT
AMP BPF
Q44
D23 FI3
T5 BTL5V
5VS
RIPPLE
YGR SP 4.0V
REG REG FILTER
REG
Q37,D17 Q15,Q16 PS3
IC3 Q12
T3C_INV 3VS
PCON
SW
REG
IC4
VCC-I
PWR ANT
DRIVE LPF
AMP SW
AMP
Q41 Q45
D24,D25
D31,D33
TTEMP 3VS
IC12 IC14A
TEMP
GATE GATE
T5
CTRL CTRL DET
ISET1 ISET2
R3
D27,D29,D30
RF
BPF BPF
AMP
Q47
D32
BPF1
BPF3 BPF2
AGC
R3
Q49,Q50
D34,D36
AGC450
BTVIN
HV
VCC
CHGC CHGH
CHG
CTRL
TXI-V VCC-I
VCO3 +5V
Q6,Q7,Q9,Q10
D2,D5,D6
T3C_INV
VCO +5V CURRENT
REG REG DETECT
Q14 IC5,D9
IC15
Q17,Q19
VCO_SEL 5VS
T3C
VCC
10 - 2
LPF LPF
D26,D28
PWR
DET
DC
SW
J2
IC1,
Q1,Q2,Q3,Q8,
D1,D3,D4
CHG
+
BTDET
S
-