SA-WCT370 - Sony Audio Service Manual (repair manual). Page 15

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SA-WCT370
SA-WCT370
15
15
For Schematic Diagrams.
Note:
•  All capacitors are in μF unless otherwise noted. (p: pF) 50 
WV or less are not indicated except for electrolytics and 
tantalums.
•  All resistors are in Ω and 1/4 W or less unless otherwise 
specifi ed.
•      f  : Internal component.
•  2 : Nonfl ammable resistor.
•  5 : Fusible resistor.
•  C : Panel designation.
THIS  NOTE  IS  COMMON  FOR  PRINTED  WIRING  BOARDS  AND  SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
•  A : B+ Line.
•  Voltages and waveforms are dc with respect to ground in 
wireless connection to the bar speaker (SA-CT370).
  no mark : POWER ON
•  Voltages are taken with VOM (Input impedance 10 M
).
  Voltage variations may be noted due to normal production 
tolerances.
•  Waveforms are taken with a oscilloscope.
  Voltage variations may be noted due to normal production 
tolerances.
•  Circled numbers refer to waveforms.
• Signal path.
  F : 
AUDIO 
(ANALOG)
  J : 
AUDIO 
(DIGITAL)
• Abbreviation
  CND  : Canadian model
For Printed Wiring Boards.
Note:
•  X : Parts extracted from the component side.
•  Y : Parts extracted from the conductor side.
•      f  : Internal component.
• 
 : Pattern from the side which enables seeing.
  (The other layers’ patterns are not indicated.)
Note: 
The components identi-
fi
 ed by mark 0 or dotted 
line with mark 0 are criti-
cal for safety. 
Replace only with part 
number specifi ed.
Note: 
Les composants identifi és 
par une marque 0 sont 
critiques pour la sécurité. 
Ne les remplacer que par 
une pièce portant le nu-
méro spécifi é.
• Abbreviation
  CND  : Canadian model
•  Indication of transistor.
 
C
B
These are omitted. 
E
Q
 
C E
B
These are omitted. 
Caution:
Pattern face side: 
(SIDE B)
Parts face side:
(SIDE A)
Parts on the pattern face side seen 
from the pattern face are indicated.
Parts on the parts face side seen from 
the parts face are indicated.
• Waveforms
– SUB MAIN Board –
Note: When the complete SUB MAIN board is replaced, re-
fer to “NOTE OF REPLACING THE IC104 ON THE 
SUB MAIN BOARD AND THE COMPLETE SUB 
MAIN BOARD” on page 4.
Note: When the complete SUB MAIN board is replaced, re-
fer to “NOTE OF REPLACING THE IC104 ON THE 
SUB MAIN BOARD AND THE COMPLETE SUB 
MAIN BOARD” on page 4.
1
IC100 
7 (Xout)
1 V/DIV, 20 ns/DIV
50 ns
2 Vp-p
2
IC105 
qf (XFSOOUT)
2 V/DIV, 20 ns/DIV
21 ns
4.5 Vp-p
20.8 
Ps
3.3 Vp-p
3
IC105 
wl (LRCK)
1 V/DIV, 10 
Ps/DIV
4
IC105 
e; (BCK)
1 V/DIV, 200 ns/DIV
326 ns
3.3 Vp-p
5
IC107 
4 
1 V/DIV, 20 ns/DIV
20.6 ns
3.2 Vp-p
6
IC103 
9 (2Q)
2 V/DIV, 50 ns/DIV
81 ns
4.1 Vp-p
Ver. 1.2
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