Sony SDP-EP70 / SDP-EP90ES Service Manual ▷ View online
– 25 –
– 26 –
– POWER SECTION –
SDP-EP70/EP90ES
F
TO FLUORESCENT
INDICATOR TUBE
T1
POWER TRANSFORMER
RECT
D115, 116
FL. +30V
STOP
+5V REG
Q103,104
+5V
D111
-13V
+30V REG
Q106
+5V REG
Q251,254
FLD. +5V
RECT
D113, 114
POWER - ON
DET
Q105
+
3
1
REG
CONTROL
IC102
3
2
RECT
D112
D112
-5V REG
IC103
+13V
+15V REG
Q101
REG CONTROL
IC101,Q107
D110
2
3
1
3
+5V REG
IC426
+7V REG
IC151
+15V
+B
+5V
REF
+7V
D104
D107
REG CONTROL
IC101,Q108
1
3
-7V REG
IC152
-7V
-15V
H
CONTROL
SECTION
-5V
-15V REG
IC102
AC
IN
POWER
S1
RECT
D101
D101
1
3
RST
RESET
IC203
09
(Page 23)
– 27 –
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• 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.
• The resistance indicated MF shows tolerance 2%.
•
•
¢
: internal component.
•
1
: fusible resistor.
•
5
: fusible resistor.
•
C
: panel designation.
For printed wiring boards.
Note:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
p
: parts mounted on the conductor side.
•
®
: Through hole.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
•
U
: B+ Line.
•
V
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
∗
: Can not be measured.
• 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 pro-
duction tolerances.
duction tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
a
: RF (AC-3)
L
: digital in
c
: digital out
Note: The components identified by mark
!
or dotted
line with mark
!
are critical for safety.
Replace only with part number specified.
WAVEFORMS
– MAIN BOARD (1/4) –
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)
Pattern face side: Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side:
Parts on the parts face side seen from the
(Side A)
parts face are indicated.
1
2
3
4
5
6
7
8
IC423
%¡
(SCKR)
IC423
$ª
(SCKT)
IC423
@¶
(EXTAL)
IC201
9
(FL-CLK)
IC201
2
(XTAL)
IC301
@™
(LRCK)
IC301
@¡
(BCK)
IC301
@º
(FS128)
5.6Vp-p
7.17MHz
5.2Vp-p
4.18MHz
5.2Vp-p
3MHz
5.2Vp-p
129kHz
4.6Vp-p
16MHz
65kHz
5.6Vp-p
4.16MHz
5.6Vp-p
5.6Vp-p
8.32MHz
– 28 –
!™
IC401
#™
(LRCKO)
!£
!¢
!∞
IC401
#¡
(BCKO)
IC405
$∞
(512F20)
– MAIN BOARD (4/4) –
9
IC901
4
(XIN)
!º
!¡
IC901
%∞
(V1)
IC906
2
– MAIN BOARD (2/4) –
IC401
7
(FI128)
– DECODER BOARD –
1
2
3
4
5
6
7
8
IC1006
!¢
(LRCK)
IC1006
8
(SCKR)
IC1006
!£
(BCKI)
IC1006
!∞
(DCK)
IC1006
!§
(MCK)
IC1006
$¡
(SC0)
IC1002
2
(XTAL)
9
IC1006
#º
(SC1)
IC1006
#¶
(SC2)
46.08MHz
2Vp-p
18.4MHz
5.8Vp-p
5.6Vp-p
18.432MHz
48kHz
6.4Vp-p
6.2Vp-p
3MHz
8.64MHz
6Vp-p
4.1Vp-p
24.6MHz
4.34MHz
5.6Vp-p
5.3Vp-p
4.27MHz
5.5Vp-p
66kHz
8.42MHz
2.2Vp-p
8.42MHz
4.4Vp-p
5Vp-p
140kHz
5.3Vp-p
528kHz
4.17MHz
5.4Vp-p
16MHz
4.6Vp-p
4-3. SCHEMATIC DIAGRAM – INPUT SECTION –
• See page 27 for Waveforms.
• See page 37, 39 for Printed Wiring Board.
• See page 55, 59 for IC Pin Functions.
• See page 72 for IC Block Diagrams.
• See page 37, 39 for Printed Wiring Board.
• See page 55, 59 for IC Pin Functions.
• See page 72 for IC Block Diagrams.
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SDP-EP70/EP90ES
(Page 34)
(Page 34)
(Page 53)
(Page 34)
(Page 36)
(Page 36)
(Page 49)
(Page 49)
(Page 49)
(Page 31)
(Page 31)
(Page 42)
(Page 46)
(Page 42)
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