Sony SCD-XB940 Service Manual ▷ View online
9
AUDIO/MAIN BOARD
MECHANISM DECK (CDM55B-DVBU3)
6
three connectors
(CN301, 304, 351)
(CN301, 304, 351)
2
two wires (flat type) (18 core)
(CN602, 603)
(CN602, 603)
3
two connectors
(CN605, 610)
(CN605, 610)
4
five screws
(BVTT3
(BVTT3
×
8)
5
MAIN board
9
two PC board holders
7
three screws
(BV/RING)
(BV/RING)
2
wire (flat type) (10 core)
(CN601)
(CN601)
2
two wires (flat type) (16 core)
(CN608, 611)
(CN608, 611)
q;
AUDIO board
8
screw
(BVTT3
(BVTT3
×
8)
1
Pull out the tray.
(Refer to page 4, “HOW TO OPEN THE
TRAY WHEN POWER SWITCH TRANS OFF”.)
(Refer to page 4, “HOW TO OPEN THE
TRAY WHEN POWER SWITCH TRANS OFF”.)
5
screw
(BVTT3
(BVTT3
×
8)
6
mechanism deck
(CDM55B-DVBU3)
(CDM55B-DVBU3)
4
connector
(CN605)
(CN605)
3
two wires (flat type) (18 core)
(CN602, 603)
(CN602, 603)
2
loading panel ass’y
1
Pull out the tray.
(Refer to page 4, “HOW TO OPEN THE
TRAY WHEN POWER SWITCH TRANS OFF”.)
(Refer to page 4, “HOW TO OPEN THE
TRAY WHEN POWER SWITCH TRANS OFF”.)
10
TRAY
1
Remove the tray. (Careful of the claw.)
claw
claw
11
11
SECTION 4
DIAGRAMS
4-1.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
•
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
a
: Through hole.
•
b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen 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.
• Main board is multi-layer printed board.
However, the patterns of intermediate-layer have not been in-
cluded in the diagram.
cluded in the diagram.
• Indication of transistor
C
B
These are omitted.
E
Q
Note on Schematic Diagram:
• 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.
•
f
: internal component.
•
5
: fusible resistor.
•
C
: panel designation.
•
U
: B+ Line.
•
V
: B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : STOP
no mark : STOP
• 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.
• Signal path.
J
: SACD
c
: CD
I
: DIGITAL OUT
• Circuit Boards Location
TRANSFORMER board
POWER board
TK board
AUDIO board
MAIN board
DISPLAY board
LOADING board
HP board
AC SW board
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
12
12
SCD-XB940
4-2.
PRINTED WIRING BOARD – TK Board –
•
See page 11 for Circuit Boards Location.
(Page 14)
(Page 14)
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