Sony CMT-EP50 / HCD-EP50 Service Manual ▷ View online
HCD-EP50
16
16
•
SIGNAL PATH
: RECORD
: TAPE PLAY
Q5
REC/PB SWITCHING
U12
ALC,
REC/PB AMP
U13
R-CH
Q36
R-CH
L-CH
HPRE101 (1/2)
(RECORD/PLAYBACK)
R-CH
R-CH
14
Q1
4
STR
1
2
6
7
3
4
4
8
7
9
(PROTECT (FWD) DETECT)
(PROTECT (REV) DETECT)
(TAPE DETECT)
(CrO
2
DETECT)
REC/PB
SWITCH
Q34
REC/PB
SWITCH
Q30
AMP GAIN
CONTROL
Q28
ALC
CONTROL
Q8
ALC
BIAS
TRAP
CAPSTAN/REEL
MOTOR DRIVE
Q37, 39
SENSORA
18
AMS
24
SEL14
98
SEL15
SEL12
96
SEL10
94
BIAS OSC
L5
9V
+5V
REC BIAS
SWITCH
Q32, 33
M
(CAPSTAN/REEL)
Q7
12
TRIGGER
PLUNGER DRIVE
Q38, 40
(TRIGGER PLUNGER)
Q3
6
LED
DRIVE
Q305
D313
SW318
(MONO STEREO)
CAPSTAN/REEL MOTOR CONTROL,
TRIGGER PLUNGER CONTROL,
REC BIAS CONTROL
U15
SYSTEM CONTROLLER
IC301 (1/3)
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
(HEAD POSITION DETECT)
STROBE
44
DATA
2
CLK
3
Q8 11
Q6
CD-EN
TU-EN
ST/BEAT
DA IN
CLOCK
13
D305
D306
D308
D29
D50
D4
D32
Q4
7
LED
DRIVE
Q304
D312
I
(Page 18)
C
(Page 15)
H
(Page 17)
TL-CH
TR-CH
RL-CH
RR-CH
F
(Page 17)
TROUT
6
V.N
1
AMS
U14
HPRE101 (2/2)
(ERASE)
SWITCHING
R-CH
ISS SWITCHING
Q41
z
TIMER
ISS
2 1
STEREO MONO
BUFFER
Q14
TAPE PLAY/REC DETECT
SENSOR
REC AMP
Q25
MUTING
Q26
TAPE TYPE
SELECT SWITCH
Q45
G
(Page 18)
99
BIAS OSC
Q31
ALC
IN1
OUT1
ALC
CONST
IN1
NF1
6-2.
BLOCK DIAGRAM – TAPE DECK Section –
HCD-EP50
17
17
•
SIGNAL PATH
: RECORD
: TAPE PLAY
: CD PLAY
: TUNER
I2CDATA
INPINENA
SYSTEM CONTROLLER
IC301 (2/3)
EEPROM
IC302
CDDATA
CDCLK
CDRESET
L3
L4
F
(Page 16)
RL-CH
TL-CH
RR-CH
TR-CH
DI
CE
X2
X1
X301
4.194304MHz
7
3
I2CCLK
5
8
CD DOOR SW 19
45
MUTE 49
15
CL
14
LT
4
5
16
12
3
42
16
43
CE
GENERALDOUT
GENERALCLK
47
1
2
GENERALDIN
100
PLLENA
48
SDA
5
SCL
6
10
9
L2
L1
LTOUT
2
11
B
(Page 15)
L
R
1
LVROUT
LVRIN
30
RVROUT
R-CH
R-CH
R-CH
CD-L-IN
CD-R-IN
CD BLOCK
INPUT SELECT SWITCH,
ELECTRICAL VOLUME
U6
R-CH
LINE AMP
U3
SOUND
CONTROL
CIRCUIT
R-CH
R-CH
MEGA BASS
CONTROL SWITCH
Q13
R-CH
PHONES
CN17
CD DO
CD CLK
CD \RESET
+
+
–
–
INPUT SELECT
SWITCH
SELECT SWITCH
SWITCH
LTCOM
4
LT
3
6
LT
2
7
LT
1
8
+9V
R-CH
R-CH
H
(Page 16)
E
(Page 15)
TU-R
TU-L
CLOCK
DA IN
DA IN
CLOCK
DA OUT
STEREO
4
STEREO
TUNED
34
STATION
PLL CE
R-CH
D23
D17
D20
JK401
Z
PUSH
OPEN/CLOSE
SW300
HEADPHONE
AMP
U9
MUTING
Q7
MUTING
Q21
SPEAKER
IMPEDANCE
USE 8
Ω
POWER AMP
U11
6-3.
BLOCK DIAGRAM – MAIN Section –
HCD-EP50
18
18
SYSTEM CONTROLLER,
LIQUID CRYSTAL DISPLAY DRIVER
IC301 (3/3)
POWER ON/OFF
RELAY DRIVE
Q605, 606
POWER
TRANSFORMER
(MAIN)
T601
LINE
FILTER
L601
AC IN
POWER
TRANSFORMER
(SUB)
T602
RE601
B+ AMP
POWER AMP (U11) B+
D16
D8
D18
D19
CD-EN
TU-EN
D318
D35
RESET 12
PWRFAIL 14
D701 – 709
(LCD BACK LIGHT)
REMOTE CONTROL
RECEIVER
X302
13 REMOTE
FM ON/OFF
CD-EN, TU-EN
ROTARY
ENCODER
X303
ENCODERA
25
ENCODERB
26
SEG30 (SEL6)
90
SEG31 (SEL7)
91
SEG37
97
SEG32
92
SEG29
89
SEG28
88
28
–
32
COM0
–
COM3
KEY1
–
KEY5
51
–
54
SEG0
–
SEG27
60
–
87
SW301 – 317
X303
VOLUME
LIQUID CRYSTAL
DISPLAY
CN301
RECT
D606, 608
RECT
D612, 613,
D616, 618
RECT
D602, 604
+8V
REGULATOR
Q9, 12
8V (CD)
CD BLOCK B+
9V
TAPE DECK SECTION,
LA1837 (U1) B+
M12V
CAPSTAN/REEL MOTOR B+
VT12V
FM CIRCUIT B+
5V (CPU)
SYSTEM CONTROLLER (IC301),
EEPROM (IC302),
94HC4094 (U15) B+
REGULATOR
CONTROL SWITCH
Q15
+12V
REGULATOR
Q47
+5V
REGULATOR
U8
+12V
REGULATOR
U7
+9V
REGULATOR
U10
FM/AM PLL (U2) B+
RDS DECODER
(IC305) B+
RESET SIGNAL
GENERATOR
IC304
RDSCLK 15
RDSDATA 35
POWER
RDATA
RCLK
50
RESET
SWITCH
Q306
D303
D302
D301
D304
SW1
D307
A
(Page 15)
I
(Page 16)
G
(Page 16)
D
(Page 15)
-1
-2
AM FREQ
STEP
9kHz 10kHz
SWITCHING
BUFFER
Q302
SWITCHING
Q301
B+ SWITCH
Q303
B+ SWITCH
Q4, 10
B+ SWITCH
Q4, 10
B+ SWITCH
Q19, 20
( AEP, UK)
( AEP, UK)
EXCEPT AEP,
UK, Chinese
EXCEPT AEP,
UK, Chinese
AEP, UK,
Chinese
6-4.
BLOCK DIAGRAM – DISPLAY/POWER SUPPLY Section –
Ver 1.1
HCD-EP50
19
19
L901
FM FREQUENCY
COVERAGE
L902, TC901
FM TRACKING
3.4
0.8
3.2
3.2
3.2
3.2
3.2
0.8
3.2
3.2
(EXCEPT AEP, UK, CH)
0.047
0.047
0.047
0.047
0.001
1SS133T
FM OSC
L902
FM RF
0.047
0.047
0.001
B. P. F.
1 2 3
0.001
FM OSC
BUFFER
BUFFER
0.001
0.047
0.047
0.047
0.047
0.047
1SS133T
0.047
1
5
4
MAIN
BOARD
(1/3)
G
i
i
i
i
GND
i
OSCO
i
VCC
GND
GND
IF OUTPUT
i
RF INPUT
i
VT
IC901
FM RF AMP/MIX/OSC
AM RF
IN
FM RF
OUT
AM/FM
SW
FM OSC
AM OSC
AFC
DET
OUT
QUAD
FM RF
IN
RF GND
MIX OUT
AGC
VCC
FM IF
IN
AM IF
IN
GND
(INCLUDED IN MAIN BOARD)
3
IC B/D
6-5.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
6-6.
SCHEMATIC DIAGRAM – FM TUNER Section –
•
See page 28 for IC Block Diagram.
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.)
Note on Schematic Diagram:
• 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.
•
f
: internal component.
•
C
: panel designation.
•
A
: 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
(
) : AM
{
} : CD PLAY
[
] : TAPE PLAY
<
> : RECORD (ISS 1)
〈〈
〉〉
: RECORD (ISS 2)
∗
: Impossible to measure
• 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.
F
: FM
f
: AM
E
: TAPE PLAY
a
: RECORD
J
: CD PLAY
• Abbreviation
AR
: Argentina model
CH
: Chinese model
CND : Canadian model
HK
HK
: Hong Kong model
MX
: Mexican model
SP
: Singapore 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
pièce por tant le numéro
spécifié.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
(Page
20)
Ver 1.1
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