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CFD-S27
5-4. SCHEMATIC DIAGRAM – MAIN SECTION (1/2) –
Note:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
Note: The components identified by mark
!
or dotted
line with mark
!
are critical for safety.
Replace only with part number specified.
•
U
: B+ Line.
• Power voltage is dc 9V and fed with regulated dc power
supply from battery terminal.
no mark : FM (Radio section)
no mark : FM (Radio section)
PLAY (Tape section)
(
) : AM (Radio section)
REC (Tape section)
• 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.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
E
: PB
a
: REC
J
: CD
1
IC3
1
r
WAVEFORMS
VOLT/DIV : 0.2V AC
TIME/DIV : 10
TIME/DIV : 10
µ
sec
2
IC801
&™
VOLT/DIV : 1V AC
TIME/DIV : 0.1
TIME/DIV : 0.1
µ
sec
3
IC801
#º
VOLT/DIV : 1V AC
TIME/DIV : 10
TIME/DIV : 10
µ
sec
1.1 Vp-p
75kHz
3.6Vp-p
4.19 MHz
4.4Vp-p
32.768 kHz
r
IC BLOCK DIAGRAMS – MAIN SECTION (1/2) –
IC1 TA2008AN
IC3 BU2614
21
22
23
24
2
3
5
4
6
7
8
9
10
1
11
12
13
14
15
16
17
18
19
20
AM
RF
FM
RF
BUFF
BUFF
IF
BUFF
AF
BUFF
FM MPX
FM
MIX
FM
IF
AM
IF
AM
MIX
AM
DET
1/8DIV
MUTE
AGC
FM RF IN
GND1
MIX OUT
AGC
VCC2
FM IF IN
AM IF IN
GND2
QUAD
ST IND
L OUT
R OUT
AM RF IN
FM RF OUT
AM OSC
FM OSC
VCC1
OSC OUT
IF OUT
DET OUT
MPX IN
LPF1/BAND
LPF2/MO-ST
VCO
FM
DET
ST
DET
LEVEL
DET
AM
OSC
FM
OSC
AM/FM
ST/MONO
SW
2
3
5
4
6
7
8
9
10
1
11
12
13
14
15
16
I / O CTL
REFERENCE
DIVIDER
MAIN COUNT
SHIFT
REGISTER
LATCH
20BIT
COUNT
PRESCALER
PHASE
DET
ULLOCK
IF COUNT
CTL
XOUT
XIN
CE
CK
DA
CD
P0
P1
VSS
PD1
VDD1
VDD2
FM IN
AM IN
P2
IF IN
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