Pa And Filter-A Units - Icom IC-756PROIII Service Manual

10-6 PA AND FILTER-A UNITS

RX 0V
TX 1.77V
C41 R10
0.001 680
L14
J1 R2 LR-360
PA
18
W1 PAI
Q1
C1
2SC1971
0.1
MEASUREMENT CONDITIONS
VOLTMETER :50kΩ/VDC
OSCILLOSCOPE :20MHz 1MΩ 25pF
SUPPLY VOLTAGE :13.8V
DISPLAY :14.1MHz USB
Q13
2SB1201
RX 1.0V
TX 7.0V
C101
0.0047
R56
12.2V
10k
CHASSIS
J11
D10
R51
MF1
MA185 56
+ MF+ MF+
M
MF- MF-
C96
-
220
RX 13.5V
TX 12.7V
RX 12.7V
TX 0V
Explanatory notes
VOLTAGE LINE
TX LINE
C61 0.001
RX 13.7V
C22 0.001
TX 13.6V
R15 R41
RX 0V 100
C21 0.001 5.6
TX 0.68V
R32
RX 13.8V
R21 10 0.68
TX 13.6V
R33
R20 10 0.68
Q2
2SC1972
L9
EXC-ELDR25C
L4
LR-143
L10
EXC-ELDR25C
R34
L1 R23 10
R9 1
0.68
LR-361
R35
R24 10
Q3 0.68
2SC1972
R16
C23 0.001
100
R42
5.6
C24 0.001
W29
C62 0.001
C20
0.1
Q8
D3
2SD1585K D2
MA29B MA29B
C18
C17
0.047 0.047
PAT8
13.5V
R52
10
C100
RX 0V
0.0047
TX 7.8V
RX 13.6V
TX 13.5V
RX 0V
TX 13.4V
R53
1k
Q12
2SB1201
14V
CP1
C102
0.0047
D61
DAP222
CP2
R55
10k
R44
3.9
Q11
2SC4081
Q10
2SC4081
RX 0V RX 0V
TX 0.75V TX 0.3V
10 - 15
J2
C123
PA P2
18p
PAO
W3
RX 13.8V
TX 13.6V
C118
120p
W14
RX 0V
TX 0.65V
Q4
2SC5125
R26
10
R27
10
Q5
2SC5125
C119
J10
120p
R31
CP39
1k
R28
5
R29
CP40 1k
EP4
CHASSIS
PHV W16
F2
EP5
CHASSIS
PGND W17
F3
RL1
AJV5341
D7
DAP222
4.4V
Q9 J3
CHASSIS W13
UNR9211J PAT8 CHASSIS
W16
PWRS
ICL
ICH
H5V CHASSIS
W17
8V
13.8V
8V
14VA
14VA
14V
14V
4.9V
IC1 14V
TA7805F
14V
H5V 14V
I O
14V
G
14V
5V
5V
IC2
4.9V
TA7805S
HV
5V NC
I O
G GND
GND
GND
IC3 GND
7.9V
MC78T08C GND
8V GND
I O
G GND
GND
GND
GND
PA UNIT
FILTER-A UNIT
CP11 CP12
J1
1 PAO
2
L29 L30 L31
LA-548 LA-550 LA-547
C83 C85 C86 RL14
RL13
AG201344
6p 15p 22p
AG201344
50MHz
C87
0.0047
L28
L8
LR-240 LR-241
RL5 C30
TB1-160 18p
C63
47p
14MHz
C46
0.0047
L24 L25 L26
LR-388
LR-387 LR-388
RL11 C37 C39 C41
TB1-160 27p 27p 10p
24MHz
28MHz
C52
0.0047
L5 L6 L7
LR-216 LR-216 LR-216
RL7
TB1-160
C18 C19 C22 C23 C26
120p 39p 39p
100p 47p
5MHz
7MHz
C48
0.0047
CP503
13.8V
PHV
W9
CP504
PGND
W10
CP502
CHASSIS FGND
EP502
L501
W15
LR-386
ACS1 ACS2
3 6
GND GND
2 5
HV HV
1 4
FHV
EP501
CP501 13.8V
A
B
C
D
L8S L8S
C88
0.0047
RL6
TB1-160
L5S L5S
C47
0.0047
RL12
TB1-160
L7S L7S
C53
0.0047
RL8
TB1-160
L3S
L3S
C49
0.0047
E
F
G
H
I
CP5 CP1
CP6 CP2
CP7 CP3
CP8 CP4
CP9
Each selected 11.0V
CP10
J3
J
L502
LR-386
K
L
M