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ICF-M88B
• 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.
•
: internal component.
f
•
: Pattern from the side which enables seeing.
•
: Carbon pattern.
(The other layers' patterns are not indicated.)
Caution:
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.
SECTION 6
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1
/
W or less unless otherwise
4
specified.
•
: internal component.
f
• 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.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM/AM
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
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 –
1
2
ANT2
FM LEAD-WIRE
DX/LOCAL BOARD
ANTENNA
A
L301
S301
FM SENS
LOCAL
DX
MAIN BOARD
B
CF1
Q2
C15
C17
JC8
15
JC6
Q1
A
R23
C
K
A
D4
C29
C18
C19
C25
C13
C21
R8
R12
D
28
(AF GND)
RV1
VOL
E
• Semiconductor
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
10
10
:Uses unleaded solder.
3
4
5
11
A
KEY BOARD
(Page 12)
(11)
TP10 (RF GND)
CF2
TP13
8
1
(FM IN)
C9
R24
1
D2
X1
C27
T1
R3
14
C38
C40
CT2
3
JC4
1
20
BPF1
JC9
R19
L2
R20
IC1
10
11
C45
C44
C34
R5
L3
C12
L4
C28
TP9
D3
(VT)
L1
R2
C2
1
3
1
C31
C3
A
C6
TP15
K
JW4
C4
A
5
4
D1
JW8
CF3
R11
CT1
C14
JW6
R13
Q3
JW7
L1
1
3
ANT1
AM FERRITE-ROD
ANTENNA
5
4
6
TP8
(GND)
R21
R17
C36
2
1
TP12
(SP OUT)
C22
+
11
(11)
1-862-330-
SP1
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