Sony ICF-CD873L Service Manual ▷ View online
ICF-CD873L
– 25 –
– 26 –
– 27 –
– 28 –
6-5.
SCHEMATIC DIAGRAM – MAIN Section –
•
See page 29 for Waveforms.
•
See page 35 for IC Block Diagrams.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : MW
〈〈
〉〉
: LW
[
] : CD PLAY
• 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
f
: MW/LW
J
: CD PLAY
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
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.
•
¢
: internal component.
•
C
: panel designation.
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
ICF-CD873L
– 29 –
– 30 –
– 31 –
– 32 –
6-6.
SCHEMATIC DIAGRAM – POWER SUPPLY Section –
•
See page 38 for IC Block Diagrams.
• Waveforms
– MAIN Board –
– MAIN Board –
1
IC401
%•
(X1) (RADIO ON mode)
1 V/DIV, 100 ns/DIV
2
IC601
%∞
(XT1) (RADIO ON mode)
1 V/DIV, 10 µs/DIV
3
IC501
1
(FEO) (CD PLAY mode)
100 mV/DIV, 50 ns/DIV
4
IC501
!ª
(CLK), IC502
!¶
(CLK0)
(CD PLAY mode)
5 V/DIV, 10 µs/DIV
5 V/DIV, 10 µs/DIV
5
IC501
@º
(XLT), IC502
!§
(XLT0)
(CD PLAY mode)
5 V/DIV, 200 ns/DIV
5 V/DIV, 200 ns/DIV
6
IC501
#¡
(RF O), IC502
#§
(RF)
(CD PLAY mode)
200 mV/DIV, 500 ns/DIV
200 mV/DIV, 500 ns/DIV
7
IC501
$™
(TEO) (CD PLAY mode)
100 mV/DIV, 500 ns/DIV
8
IC502
$™
LRCK (CD PLAY mode)
2 V/DIV, 10 µs/DIV
9
IC502
$§
(BCK) (CD PLAY mode)
2 V/DIV, 200 ns/DIV
0
IC502
&£
(XTAI) (CD PLAY mode)
500 mV/DIV, 50 ns/DIV
!¡
IC50
1
(XOUT) (RADIO ON mode)
500 mV/DIV, 10 µs/DIV
3.7 Vp-p
238 ns
3.2 Vp-p
30.5
µ
s
Approx.
136 mVp-p
136 mVp-p
5.4 Vp-p
14.3
µ
s
5.2 Vp-p
102 ns
1.3
±
0.5 Vp-p
Approx.
144 mVp-p
144 mVp-p
5.3 Vp-p
22.8
µ
s
5.3 Vp-p
472 ns
1.4 Vp-p
59 ns
1.3 Vp-p
13.3
µ
s
•
U
: B+ Line.
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
[
no mark : FM
[
] : CD PLAY
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
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.
•
5
: fusible resistor.
•
C
: panel designation.
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
– 35 –
– 36 –
• IC Block Diagrams
– MAIN Board –
– MAIN Board –
IC1
CXA1238M-T6
IC50
BU2614FS
IC501
CXA1782CQ
VCO
REGULATOR
FM FRONT-END
AM FRONT-END
MPX
REGULATOR
MONO/STEREO
SELECT
DECORD
AMP
MUTING
AUTO
BLEND
TUNING
INDICATOR
AM IF/
DET
FM IF/
DISCRI
RIPPLE
FILTER
BAND-PASS
MUTE
1
27
28
29
30
24
25
26
21
22
23
18
19
20
16
17
2
3
4
5
6
7
8
9
PLL LPF1
PILOT DET LPF2
PILOT DET LPF2
ST IND/VCO CHECK
L-CH OUT
VCC
R-CH OUT
RIPPLE FILTER
AGC AFC1
10
AGC AFC2
13
FM IF IN
14
AM IF IN
15
BAND SELECT
11
GND
12
TUNE IND
1/2
COUNTER
1/2
COUNTER
PD1
PD2
FM/AM FE OUT
FM GND
FM RF IN
AM RF IN
FM RF
REG
FM OSC
AFC
AM OSC
MUTE
FM DISCRI
GND
PLL LPF2
MPX REG
VCO
FM IN
PD1
VSS
VDD2
VDD1
AM IN
P2
IF-IN
XOUT
XIN
CE
CK
DA
CD
P0
P1
16
12
13
14
15
8
9
10
11
4
5
6
1
2
3
7
IF
COUNTER
OUTPUT
CONTROL
I/O CONTROL
REGISTER
MAIN CONTROL
PRESCALLER
PHASE
DETECT
36
35
34
33
32
31
30
29
28
27 26 25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
37
38
39
40
41
42
43
44
45
46
47
48
PHD 2
PHD 1
PHD
LD
RF O
RF I
CP
CB
CC1
CC2
FOK
SENS
C.OUT
XRST
DATA
XLT
CLK
VCC
ISET
SL O
SL M
SL P
TA O
TA M
FSET
TG2
TGU
SRCH
FE O
FLB
FGD
FDFCT
FE M
FEI
FEO
FE BIAS
F
E
EI
VEE
TED
LPFI
TEI
ATSC
TZC
TDFCT
VC
APC
LEVEL S
FOK
MIRR
RF IV AMP1
RF IV AMP2
FE AMP
TTL
IIL
FZC COMP
DFCT
IIL
TTL
IIL DATA REGISTER
INPUT SHIFT REGISTER
ADDRESS DECODER
OUTPUT DECODER
TTL
IIL
TOG1-3
BAL1-3
FS1-4
TG1-2
TM1-7
PS1-4
F IV AMP
E IV AMP
BAL1
BAL2
BAL 3
TE AMP
TZC COMP
DFCT
TM1
DFCT
FS4
ATSC
WINDOW COMP
TOG1
TOG2
TOG3
FCS PHASE
COMPENSATION
FS1
F SET
TG2
TM7
TM3
TM4
TM5
TM6
ISET
TRACKING
PHASE
PHASE
COMPENSATION
HPF COMP
LPF COMP
TG1
FS2
TM2
RF M
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