Sony CMT-EP303 / HCD-EP303 Service Manual ▷ View online
16
HCD-EP303
SECTION 6
DIAGRAMS
6-1. Circuit Boards Location
MAIN board
LED board
HEADPHONE board
CASSETTE board
DISPLAY board
POWER board
17
17
HCD-EP303
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. p: pF.
• All capacitors are in µF 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.
•
2
: nonflammable resistor.
•
C
: panel designation.
Note on Printed Wiring Board:
•
W
: indicates side identified with part number.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Indication of transistor
•
A
: B+ Line.
•
H
: adjustment for repair.
• 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.
no mark : FM
<
tion tolerances.
no mark : FM
<
> : CD (STOP)
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
E
: PB (TAPE)
a
: REC (TAPE)
J
: CD PLAY
• Abbreviation
E51
: Chilean and Peruvian model.
MY
: Malaysia model.
SP
: Singapore model.
AR
: Argentine model.
MX
: Mexican model.
AUS
: Australian model.
Note:
The components identi-
fied by mark
The components identi-
fied by mark
0
or dotted
line with mark
0
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
• WAVEFORMS
– MAIN Board –
– CASSETTE Board –
– DISPLAY Board –
1
IC102
ws
(XOUT)
3.4 Vp-p
139 ns
1 V/DIV, 40 ns/DIV
2
Q705 (Collector)
(RECORD mode)
2 V/DIV, 4
µ
s/DIV
3
IC601
tl
(X2)
1 V/DIV, 100 ns/DIV
6.0 Vp-p
12.4
µ
s
5.2 Vp-p
167 ns
B
These are omitted.
C
E
18
18
HCD-EP303
6-2. Block Diagrams
TUNER/TAPE DECK Section
: FM
: AM
• Signal Path
• R-CH is omitted due to same as L-CH.
: PB(TAPE)
: REC(TAPE)
9
13
12
11
1
3
10
5
15
7
7
16
18
19
20
15
8
11
12
6
4
5
3
7
2
4
3
1
22
Q101
FM OSC
BUFFER
BUFFER
Q102
BAND
SWITCH
Q703
MUTING
CONTROL
SWITCH
Q704
MUTING
CONTROL
SWITCH
Q702
MUTING
Q104
AMP
Q601
BUFFER
BPF
ANT1
AMRF
IN
AM
OSC
24 FMRF
IN
22
FMRF
OUT
FM
OSC
20
QUAD
AM
OSC BUFFER
FM
ANT
L110
AM ANT
D105
T102
AM OSC
L103
FM RF
D103
D104
L104
FM OSC
F101
10.7MHz
T103
X101
10.7MHz
PD
LRFIN
LPFOUT
FMIN
AMIN
BO1
IO1
IFIN
DO
DI
CL
CE
IC102
FM/AM PLL
X102
7.2MHz
XIN
XOUT
AM MIX
FM MIX
FM DET
SD
AM/FM
IF
BUFFER
AM IF
16
17
L
R
IC101
AM/FM IF AMP,
MIX, MPX, DET, OSC
REC
BIAS
OSC
Q706
SW701
(3/6)
REC
PB
R-CH
L
R
T701
REC BIAS
ERASE HEAD
REC/PB HEAD
AMP
ALC CONT
ALC IN1
IN1
OUT1
M
41 36 37 47 38
60
(CAPSTAN/REEL)
STEREO
45
SYNCRO
TUNER SD
ST
PLLDI
PLLCE
PLLCL
PLLDI
PLLCE
PLLCL
STOUT
SIG
SIG
ST
PLLDI
PLLCE
PLLCE
PLLCL
STOUT
AMP SECTION
B
AMP SECTION
C
AMP SECTION
D
DISPLAY SECTION
E
AMP SECTION
A
IC701
ALC REC/PB AMP
IC601 (1/3)
SYSTEM CONTROLLER
R-CH
TUNER
L-CH
PL
RL
DC_12V
(MAGNET)
COTR
S201
(PLAY)
+
TC102
TC101
FM FREQUENCY
COVERAGE
AM FREQUENCY
COVERAGE
AM TRACKING
FM TRACKING
F102
PLLDO SELECT
DISPLAY SECTION
F
M201
SW701
(4/6)
PB
REC
SW701
(6/6)
PB
REC
SW701
(5/6)
REC
PB
19
19
HCD-EP303
AMP Section
• Signal Path
• R-ch is omitted due to same as L-ch.
: FM
: CD
: PB(TAPE)
: REC(TAPE)
IC203
FUNCTION SELECT SWITCH,
ELECTRONIC VOLUME
Q301,302
MUTING
Q314
MUTING
CONTROL
SWITCH
Q201
REC AMP
Q206
MEGA BASS
R-CH
R-CH
R-CH
RL
LTCOM
LTOUT
LVRIN
LVROUT
L3
CD
CD
CD L
CD L
CD R
CDDAT
CDCLK
CDRS
TUNER
L-CH
PL
L4
TUNER
TUNER
L2
TAPE
TAPE
DI
CE
46
52
BASS BOOST
MUTE
MUTE
1
10
9
11
15
16
2
12
11
5
3
3
4
40
DATA
34
CD-RESET
42
CD CLOCK
61
CD DATA
D332
D333
+
+
+
+
–
+
–
SPEAKER
(IMPEDANCE
USE 4
Ω
)
L
R
PHONES
SPK301
JK401
IC601 (2/3)
SYSTEM CONTROLLER
D
A
B
C
CL
14
39
CLOCK
48
CE
TAPE
SECTION
TUNER
SECTION
TAPE
SECTION
TAPE
SECTION
H
DISPLAY
SECTION
SECTION
G
DISPLAY
SECTION
SECTION
CD BLOCK
30
TAPE
COTR
DATA
CLOCK
IC301
POWER AMP
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