Sony MDX-C8970 User manual

SERVICE MANUAL
MDX-C8970
SUPPLEMENT-1
File this supplement with the service manual.
US Model
Subject: Main/Display/Relay Boards Modification
CONTENTS
1. DISCRIMINATION .................................................... 2
2. DIAGRAMS
2-1. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 3
2-2. Schematic Diagram – MAIN Board (1/5) – .................. 5
2-3. Schematic Diagram – MAIN Board (2/5) – .................. 6
2-4. Schematic Diagram – MAIN Board (3/5) – .................. 7
2-5. Schematic Diagram – MAIN Board (4/5) – .................. 8
2-6. Schematic Diagram – MAIN Board (5/5) – .................. 9
2-7. Printed Wiring Board
– MAIN Board (Component Side) – .............................. 10
2-8. Printed Wiring Board
– MAIN Board (Conductor Side) – ................................ 11
2-9. Printed Wiring Board – DISPLAY Board – ................. 12
2-10. Schematic Diagram – DISPLAY Board – ..................... 13
2-11. Printed Wiring Board – RELAY Board – ...................... 14
2-12. Schematic Diagram – RELAY Board –......................... 15
3. ELECTRICAL PARTS LIST ............................... 16
(ECN-CSB00896)

2
1. DISCRIMINATION
Former :1-674-589-11
New :1-674-589-12
Former :1-674-590-11
New :1-674-590-12
Former :1-674-591-11
New :1-674-591-1
2
– MAIN BOARD (Component Side) –
– RELAY BOARD (Component Side) –
– DISPLAY BOARD (Conductor Side) –

3
2. DIAGRAMS
2-1. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
(In addition to this, the necessary note is printed in each block)
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
•f: internal component.
•C: panel designation.
Note on Printed Wiring Boards:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•f: internal component.
•b: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated)
•U: B+ Line.
• Powervoltageisdc 14.4Vandfedwithregulated dcpower
supply from ACC and BATT cords.
• Voltages aretakenwith aVOM(Input impedance10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F: FM
f: AM
E: MD
Note: The components identified by mark 0or dotted line
with mark 0are critical for safety.
Replace only with part number specified.
Caution:
Pattern face side: Partsonthepatternfacesideseen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.

4

55
MDX-C8970
2-2. SCHEMATIC DIAGRAM – MAIN Board (1/5) –
Note on Schematic Diagram:
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(Page 9)
(Page 7)
(Page 8)
(Page 6)

66
MDX-C8970
2-3. SCHEMATIC DIAGRAM – MAIN Board (2/5) –
Note on Schematic Diagram:
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(Page
5)
(Page 7)
(Page 8)

77
MDX-C8970
2-4. SCHEMATIC DIAGRAM – MAIN Board (3/5) –
Note on Schematic Diagram:
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : AM
〈〈 〉〉 : MD PLAY
(Page 9)
(Page 5)
(Page 9)
(Page 6)
(Page
8)

88
MDX-C8970
2-5. SCHEMATIC DIAGRAM – MAIN Board (4/5) –
Note on Schematic Diagram:
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
〈〈 〉〉 : MD PLAY
(Page 5)
(Page
7)
(Page 6)
(Page 15)

99
MDX-C8970
2-6. SCHEMATIC DIAGRAM – MAIN Board (5/5) –
Note on Schematic Diagram:
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : AM
〈〈 〉〉 : MD PLAY
(Page 7)
(Page 5)

1010
MDX-C8970
D701 H-11
IC151 E-3
IC271 C-13
IC300 H-6
IC404 E-10
IC421 E-12
IC500 J-6
IC506 H-5
IC507 J-8
IC602 D-7
IC632 D-6
IC691 G-8
IC701 H-12
IC702 J-11
Q131 I-2
Q132 I-2
Q133 G-1
Q180 B-2
Q181 B-2
Q182 C-2
Q183 C-2
Q185 D-3
Q251 J-9
Q253 I-9
Q254 J-10
Q255 J-9
Q256 J-9
Q271 C-13
Q272 C-12
Q275 B-13
Q421 D-11
Q422 D-11
Q423 E-11
Q424 E-11
Q441 F-9
Q451 D-10
Q461 D-9
Q462 E-10
Q471 C-8
Q472 D-8
Q473 C-8
Q474 D-8
Q501 H-5
Q523 J-8
Q691 G-8
Q751 F-2
Q752 G-2
D2O4 J-11
D251 K-12
D252 K-12
D253 K-12
D254 K-11
D255 K-13
D256 K-13
D257 K-12
D258 K-12
D259 K-12
D260 K-12
D261 K-13
D262 K-11
D263 K-11
D264 K-11
D265 K-11
D271 D-13
D279 B-14
D280 A-14
D282 A-14
D283 B-13
D291 B-3
D421 E-11
D422 E-12
D423 D-12
D424 D-12
D441 E-9
D442 E-9
D461 C-10
D462 C-10
D463 C-10
D464 C-9
D466 C-9
D467 D-10
D468 D-9
D471 C-8
D472 D-8
D481 B-7
D482 B-7
D483 B-6
D484 B-6
D485 B-7
D486 B-8
D487 B-8
D488 B-8
D491 B-6
D546 K-3
D601 B-5
D631 B-4
D661 A-1
Ref. No. Location
Ref. No. Location
• Semiconductor Location
2-7. PRINTED WIRING BOARD – MAIN Board (Component Side) –