Sony CMT-EP303 / HCD-EP303 Service Manual ▷ View online
26
26
HCD-EP303
6-9. Schematic Diagram DISPLAY Section
2.3
2.3
2.3
2.3
2.3
2.3
2.3
5.3
2.3
2.3
5.2
5.2
5.2
5.2
0.9<4.6>
5.2
4.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
3.1
4.7
5.3
4.7
5.2
1.6
<9.7>0.1
<4.7>4.3
3.9
<0>1.4
0.5
0
0
0
0
0.6
0.6
0
4.6
0
0
<4.5>
<4.6>4.3
5.4
<0.1>5.3
0
5.3
0
3
2.5
4.7
4.7
4.7
0
4.7
4.7
0
<4.5>0
0
0
<5.1>.2.6
5.2
<1.9>5.2
4.7
5.3
5.3
5.3
5.3
5.3
5.3
5.3
4.7
5.3
5.4
5.3
5.3
5.4
5.4
5.2
5.2
0.1
MAIN
BOARD
(1/2)
CN101
A
(Page 22)
1N4148
1N4148
1N4148
1N4148
1.8k
2SC945
2SA733
SC945
SC945TR
1N4148
1N4148
1.8k
4.7k
2.2k
1
Q603,604
SWITCH
2
1 : D648, Q604, R668
US, CND model
US, CND model
2 :D618, Q603, R666
EXCEPT AEP,UK model
EXCEPT AEP,UK model
3 :D603
EXCEPT AEP,UK model
EXCEPT AEP,UK model
SEL2215S-CD
2.7k
TIMER
1N4148
Q601,602
BUFFER
0.1
0.1
0.1
18p
20p
6MHz
0.1
0.022
PST529D
O
G
I
10
16V
1N4148
1N4148
1N4148
1N4148
TC4094BF
1N4148
1N4148
1N4148
0.1
22
10V
0.1
1N4148
1N4148
3
MAIN BOARD (2/2)
CN204
D
MAIN BOARD (2/2)
CN302
C
(Page 23)
(Page 23)
DISPLAY BOARD
I/
TAPE
TUNER
CD
MUSIC MENU
MEGA BASS
TUNER MEM
PRESET +
PRESET -
VOLUME -
VOLUME +
TUNING +
REPEAT
SHUFFLE
TUNING -
LED BOARD
COM0
S31
S30
S29
S28
S27
S26
S25
S24
S23
S22
S21
S20
S19
S18
S17
S16
S15
S14
S13
S12
COM1
COM2
COM3
BIAS
VLC0
VLC1
VLC2
TUNER
TAPE
CD
TIMER STATUS
VSS
CD RESET
SURROUND
PLL CL
PLL DI
TUNER SD
CLOCK
DATA
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
IC601
UPD753016AGC
S0
CPU RESET
KEY R3
KEY R2
KEY R1
KEY R0
12/24H SELECT
NC
CD
DATA
DATA
PLLDO
SELECT
X2
X1
IC
XT2
XT1
VDD
DPSW2/SLEND
BASS BOOST
PSW
RDS DATA
SHRST
CE
PLLCE
MUTE
SYNCRO
REMOTE
RDS CLOCK
CD CLOCK
STEREO
IC601
SYSTEM CONTROLLER
LIQUID CRYSTAL DISPLAY DRIVER
LIQUID CRYSTAL DISPLAY
LD621
IC603
RESET SIGNAL
GENERATOR
IC602
KEY CONTROL
(LCD BACK LIGHT)
REM601
REMOTE CONTROL
RECEIVER
REM601
3
• See page 17 for Waveforms.
27
27
HCD-EP303
6-10. Printed Wiring Board POWER Section
POWER BOARD
MAIN BOARD
E
(Page 21)
AC
IN
IN
TR401
POWER
TRANSFORMER
E
E
K
A
K
A
A
B
C
D
E
F
1
2
3
4
5
Ref. No.
Location
D401
F-4
D402
F-3
D403
F-4
D404
F-4
D405
F-2
D406
F-3
D407
F-2
D408
F-3
D409
D-3
D411
D-4
D412
D-4
D413
D-4
D414
D-4
Q401
D-1
Q402
D-2
ZD401
E-2
• Semiconductor
Location
• See page 16 for Circuit Boards Location.
28
28
HCD-EP303
6-11. Schematic Diagram POWER Section
0.6
0
0.8
1.6
No mark:FM
MAIN BOARD
(2/2)
E
CN402
6P
C407
100
25V
25V
C405
100
25V
25V
C401
100
10V
10V
R406
390
3W
+
C404 0.01u
C402 0.01u
C408 0.01u
C406 0.01u
TR401
POWER
TRANSFORMER
MTZJ-6.8B
+
+
+
Q401, 402
POWER ON/OFF
RELAY DRIVE
Q402
2SA733
C411
0.1
Q401
2SC3330
TR402
POWER
TRANSFORMER
2.2k
C410 680p 250V
82 1/4W :EXCEPT US CND, MX
10 1/4W :US CND, MX
10 1/4W :US CND, MX
120V :EXCEPT US,CND,MX
250V :US,CND,MX
250V :US,CND,MX
RL401
AC IN
POWER BOARD
3.15A 125V
(EXCEPT US,CND,MX)
(US, CND,MX)
2A 125V (US, CND,MX)
(EXCEPT US,CND,MX)
2.2k
(Page 23)
510 : EXCEPT US,CND,MX
180 : US,CND,MX
180 : US,CND,MX
100k : EXCEPT US,CND,MX
180k : US,CND,MX
29
HCD-EP303
• IC Block Diagrams
IC101 LA1823
– MAIN Board –
24
23
FM
RF
1
AM
RF
GND2
2
VCC2
REG
3
AM
MIX
AM
OSC
OSC
BUFFER
4
22
21
VCC1
20
FM
OSC
PHASE
COMP
FM
MIX
DECODER
5
6
19
GND1
7
MUTE
8
18
17
16
9
15
PILOT
DET
14
FM
DET
13
10
FM
S-METER
11
12
ST
ST SW
FF
VCO
FF
FF
TRIG
AM
IF
AM
DET
AGC
FM
IF
SD
IF
BUFFER
FMRF IN
RF GND
FMRF OUT
VCC2
FM OSC
DET OUT
MUTE
R
L
AM/FM
MO/ST
FM DET
AMRF IN
REG
AM OSC
VCC1
FM MIX
GND
FM BUFFER
AM OSC BUFFER
AM MIX
QUAD
AMIF
SD
IC102 LC72131
PHASE
DETECTOR
CHARGE PUMP
SWALLOW COUNTER
1/16, 1/17 4BITS
12BITS
PROGRAMMABLE
DRIVER
UNIVERSAL
COUNTER
REFERENCE
DIVIDER
POWER
ON
RESET
1/2
CCB
INTERFACE
1
3 4 5 6
7 8 9 10
18
17
16
15
13
12
11
19
20
21
22
XOUT
VSS
AOUT
AIN
PD
VDD
FMIN
AMIN
14
NC
XIN
DO
CL
DI
CE
2
NC
IFIN
IO1
BO4
BO3
BO2
BO1
IO2
UNLOCK
DETECTOR
DATA SHIFT REGISTER LATCH
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