PRESIDENT Mc KINLEY US 12/24, Service Manual, Page: 16 / 65

ASC AGC
27MHz 10.695MH ｚ 10.695MHz
10.695MHz 455KH
ｚ
X303
10.695MHz 455kHz
RX
D303,306
IC301
IC302 TX
FRONT MIC
6 12V
PD1 5 GND
4 RX AUDIO
3
PTT/UP/DN
2 SP GND
J591 1 MIC
VOX MIC. JACK
POWER
INPUT
COM 0-3
MASTER MCU IC601 SLAVE MCU IC404
CH SW
Q203
SSB SW
Q413
PA MIC AMP
Q414
PA MUTE
Q407
BEEP ATT
Q401
BEEP MUTE
Q411
TB MUTE
Q209
COMP DET
IC204
MIC AMP
Q202
AM
CUR CONT
BPF
SW SW SW
WX TRAP
GRN BLU
PD
Q606,607
DIMMER
LCD
SEG 0-51
Q201 SSB
ALC DET
Q602 Q604 Q603
RED
Q3,Q4,Q5
NOISE
AMP
D6
NOISE
DET
Q14,Q21
PULSE
AMP
IC603
EEPROM
Q591
FINAL
Q592
DRV
BUFFE
R
Q593
PRE DRV
÷
2048
Q208
TX BUFFER
Q304 VCO
BUFFER
IC2
SQ AMP
D1,D2
RF ATT
Q1
RF AMP
BPF
Q2
1st Mixer
Q15,Q16
SQ
SENS SW
FT2
MCF
D18
AGC DET
D17
AM DET
Q9
IF AMP
1st
IC1
AGC AMP
2nd
D222,223
TX MIXER
FT1
MCF
Q307
CARRIER
OSC
D410
ANTI
VOX DET
Q18
AM AGC
SW
D101
ASC
NOISE DET
Q22
AM MUTE
Q10
IF AMP
3rd
D19,Q23
ANL
FREQ.
SELECT
IC3
ASC
NOISE AMP
Q6
NB AGC
AMP
BPF
Q8
NB GATE
Q7
2nd Mixer
FT2
Ceramic
IC1
AGC AMP
1st
Q11
IF AMP
2nd
SW
Q17
SSB AGC
SW
Q12
HI CUT
Q439,440
VOX AMP D411,412
VOX DET
Q12
IF AMP
4th
IC2
SUM AMP
Q13
RX MUTE
Q101
ASC
GATE
Q403
AF MUTE
Q13
SSB DET
Q303, D303
CB VCO
IC202
BAL
MOD.
Q217
COMP DC
AMP
Q215
Buffer
LPF
Q412
INHIBIT
IC401
SP AMP
Q14
SSB MUTE
IC501
2nd Mixer
FT502
BPF
IC501
IF LMT AMP
IC501
FMDET
Q406
RL DRV
IC501
SQ AMP
IC501
NOISE AMP
D502
NOISE
DET
Q301
WX VCO
÷
N1
Q306
REF OSC
Q503
1050Hz
BPF
Q504
WAVE
FORM
Q212
SSB
MOD MUTE
Q302 VCO
BUFFER
÷ N
REF
OSC
X601, Q601
CLOCK OSC
(10.16MHz)
IC602
RESET
D501
ANT SW
Q501
LNA
Q502
1st Mixer
FT501
BPF
DIRECTIONAL
COUPLER
LPF L203,204
FINAL
MTCH
IC201
2CH
DC AMP
LPF
LPF
Q435
MIC SEL
Q436,437
MIC SEL
Q204,Q205
V LIMIT
Q433,441
DC/DC SW
Q434
MIC SEL
COMP ATT
Q214
Q218
MIC ATT
÷
R
Qxxx
WXINV
Q417
CLOCK OSC
(10.
100
MHz)
Q421
～
432, D408,409
MODE SW
Q415,416
5V REGU Q418,419,420
8V REGU
IC405
DCDC
CONV
IC402
2.5V REF
IC403
RESET
Q220
TBEEP MUTE
Q25
RX TONE
Q409
PWM BUFF-1
IC205 2/2
PWM BUFF-2
IC205 1/2
PWM BUFF-3
Q219
TB ATT
Q210
BAL SW
Q505
WX MUTE
SSB_RX
AM
SSB_RX
TX
SSB_RX
TX
SSB_RX
AM
AM
SSB_RX
ASC GATE
ANL
SSB
AM
WXMUT
RMUT
VOLUME
CB PLL DAT
SRF
CBSQ
SQ
CONT
SSB AM
SSB SQ
AM/FM SQ
AGC
VT8
RF G
MC G
USB
LSB
AM
S
S
B
_
RX
VT
8
IDLE
PTT
NC
F R
REV FWD
HICUT
VXSNS
MIC
BIAS
MIC
BIAS
JKDET
SRF
PWR SW
V13I V12 V8 V5
SQVOL
V12
CBSQ
ANL
PL
L
CLK
S
P
CO
NT
PASP HICU
T
P
-CONT
A
NT
V
X
P
-DIM
9/19
S
RF
CHUP
SQVOL
ANTVX
AL
T
SW
SW
M
EEP
DAT
EEP
CL
K
ASC G
AT
E
P
_K
E
BEEP
NB
CHDN
W
X
SQ
BEEP
AM
MSEL
MICMUT
ALC
1
0
5
0
Hz
J
K
DET
BACK LIGHT FOR LCD/KNOBS
FW
D
VX
SNS
REV
PRESIDENT
Mckinley USA BLOCK DIAGRAM
IDLE
27MHz
P
L
L
DA
T
VOLMUT
T
O
NE
V13I
MODSIG
NB
AMC
AMC
5kHz
SPCONT
TXC
D7,9
D8,21
Q305
D8,11
D12,13
USB TX/RX:10.6975MHz
LSB TX/RX:10.6925MHz
AM TX :10.6975MHz
ANT
LD
CLARIFIER
TX F ADJ
1050Hz
WXSQ
PAAMP
EXT SP
INT SP
PA SP
PASP
ALTSW
A
M
SEL
LD
U
WX PLL DAT
CB PA
RL401
X301
10
.100
MHz
X302
10.24
17
MHz
RED GRN
B
LU
・
F/
M
E
M
CB
/P
A
W
EAT
HER
A
NL
/NB
/HI
C
CLK
VL4
DAT
DAT
EN
PL
L
L
E
CB
PL
L
L
E
W
X
RM
UT
T
B
M
UT
RM
UT
PAA
M
P
W
X
M
UT
VOLH
VOLH
ALC
SSB
VR8
PC
PC
AM
TB 1-4
AM
L
TBMUT
RX
C
10.
100
MHz
10.
100
MHz
V
T
8
VR8 S
S
B
RX
SSB
AM
USB L
S
B
VR8
/WXMUT
/W
X
M
UT
TONE
M
ICM
UT
T
B
L
EVE
L
BEEP
L
EVE
L
TB LEVEL
P
W
1
PW
2
P
W
3
RF G
M
IC
G
PC
T
O
NE