PRESIDENT JOHNNY III ASC 12/24, Service Manual

Page: 21 / 66

ASC AGC
27MHz 10.695MH
ｚ
10.695MHz 455kHz
37.66MHz
～
38.1MHz 10.24MHz
RELAY
RL401
EXT SP
10.24MHz
D4
ANTI VOX
DET
INTERNAL
SP
16Ω
5W
FRONT MIC
6 13V
5 GND
4 RX AUDIO
3
PTT/UP/DN
26.965MHz
～
27.405MHz 26.965MHz
～
27.405MHz
2 SP GND
ANT
1 MIC
MAXMOD
VOX MIC. JACK
POWER SUPPLY
EN
MCU IC403
D801,D802,D851,D852
LED BACK LIGHT
ORG* 4
CH SW
IC401
MIC AMP
Q407
MIC MUT
Q415
AMC DET
CONFIG
MATRIX IC405
EEPROM
IC402
2.5V REF
Q421,Q424
TX 8V
REGU
Q410,Q411
MIC SEL
IC406
AM MOD
AMP
Q402
AM MOD
MUTE
Q409,Q412
COMP DET
& DC AMP
Q413
VOX MIC
X301
REF OSC
IC491
12V DC/DC
Q416,418,422
8V REGU
Q417,419
5V REGU
IC401
LPF
Q404,Q405
VOX AMP
D401,D402
VOX DET
Q401
AF MUTE
IC406
SP AMP
LPF
FINAL
MATCH
Q502
FINAL
Q302
VCO
BUFF
Q414
MIC SEL
Q406
TONEMUT
LPF
D11
AM DET
Q10
AF AMP
Q9
AM MUTE
Q7
HI CUT
Q11
ASC
GATE
D1,D2
RF ATT
Q1
RF AMP
BPF
Q2,Q3
1st Mixer
D13
ASC
NOISE DET
IC6
AGC AMP
Q8
IF AMP
2nd
D8
ANL
IC7
ASC
NOISE AMP
D12
AGC DET
IC404
RESET
IC6
SQ AMP
Q5
2nd Mixer
Q6
IF AMP
1st
Q420,Q423
PWR
REGU
IC301
PLL
Q204
TX BUFFER
T401
AM MOD
TRANS
Q425
REF CLK
FT2
Ceramic
Filter
BPF
Q203
PRE DRV
Q301
VCO
FT1
MCF
Q202
DRV
Q303
VCO
SHIFT
ASC
AMMUT
VOLUME
SCK
DAT
LE
SRF
SQ
SQ
CONT
AGC
VT8
LD
PWR ADJ
MIC SW
NC
HICUT
VOX
SENS
MIC
BIAS
MIC
BIAS
JKDET
FIN
12V
8V
5V
ATXMUT
XIN
CP
12V
12V
T
O
NE
PLL DAT
LD
SQ
SRF
CO
NFIG
S
P
CNT
J
K
DE
T
M
IC
S
W
VO
X
SENS
HI
CUT
TB RM
UT
P
L
L
CLK
PL
L
DAT
P
L
L
L
E
CO
M
0
CO
M
1
C
O
M
2
CO
M
3
SEG0
S
E
G
13
ANI ANI
ANI
ANI
CHUP
ANT
I
VOX
5V
S
Q
V
O
L
ANI
M
ICSEL
M
ULT
I
EEP DAT
EEP C
LK
RS
T
N
TONE
ANI
CHDN
ASC
ANI
TONE(ROGER)
MICSEL
MIC MUT
AMC
M
ICM
UT
LCD DP551
X
IN
A
N
I
S
W
1
ANI
SW
2
BLOCK DIAGRAM (Ver.1)
JOHNNY III 12/24 V (UT404AV)
RMUT
TONEMUT
XTAL
OFFSET
EXTCLK
EXTCLK
8V
SQ VOL
SQVOL
VT8 VT8
8V VT8
T
UN
EM
UT
SF
T
AM/FM MEM ROGER HI-CUT VOX F
SFT
ANTI VOX
SPCNT
AT
X
M
UT
TB
A
M
M
UT
PWR SW
RF VOL