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ICF-M88B
10
10
SECTION 6
DIAGRAMS
•
Note for Printed Wiring Boards and Schematic Diagrams
Note on Printed Wiring Boards:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
W
: indicates side identified with part number.
•
z
: Through hole.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
•
: Carbon pattern.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side) the parts face are indicated.
Note on Schematic Diagram:
•
All capacitors are in
µ
F unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
•
All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
•
Power voltage is dc 3 V and fed with regulated dc power
supply from battery terminal.
supply from battery terminal.
•
Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM/AM
under no-signal (detuned) conditions.
no mark : FM/AM
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
•
Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
Voltage variations may be noted due to normal produc-
tion tolerances.
•
Circled numbers refer to waveforms.
•
Signal path.
F
: FM
f
: AM
6-1. PRINTED WIRING BOARDS – TUNER Section –
:Uses unleaded solder.
R21
R17
C36
R19
C40
C38
R3
C9
R24
JC4
JC9
R5
C12
C28
R11
R20
C44
C45
C2
R2
C3
C6
C14
R13
C4
R7
JC12
JC11
JC10
C35
C8
R25
C11
JC3
C32
C30
C26
R9
R10
R4
C10
C39
C37
C42
C43
R1
C47
C46
L4
D1
IC2
IC1
D2
KA
D3
KA
Q3
BC
E
C16
C20
C23
C24
JC5
R6
R14
C15
C29
C19
C13
R8
R12
JC8
R23
JC6
EC
B
EC
B
Q2
Q1
D4
X1
1
1
3
8
JW1
JW2
JW3
C22
C34
+
+
C31
+
CT1
L1
L1
JW7
JW6
JW4
JW8
CF3
L3
L2
CT2
C27
BPF1
+
T1
CF1
CF2
C21
C17
+
+
+
C18
C25
+
RV1
MAIN BOARD
(11)
11
1-862-330-
TP8
(GND)
TP12
(SP OUT)
TP9
(VT)
TP15
(AF GND)
TP13
(FM IN)
TP10 (RF GND)
1
1
10
20
11
2
K
A
A
SP1
GRAY
RED
RED
NATURAL
BLK
ANT1
AM FERRITE-ROD
ANTENNA
1
14
1
15
28
3
5
4
1
3
5
4
VOL
A
A
K
KEY BOARD
A
RED
GRY
RED
BLK
GRY
RED
BLK
GRY
RED
GRAY
GRAY
RED
L301
R302
S301
DX/LOCAL BOARD
(11)
11
1-862-331-
ANT2
FM LEAD-WIRE
ANTENNA
FM SENS
LOCAL DX
A
B
C
D
E
1
2
3
4
5
6
•
Semiconductor
Location
Location
Ref. No. Location
D1
D-5
D2
C-4
D3
D-4
D4
C-1
IC1
C-3
IC2
C-5
Q1
C-2
Q2
B-2
Q3
D-4
(Page 12)
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