Sony SCD-XB940 Service Manual ▷ View online
33
2
IC203
ea
(EXTAL)
– DISPLAY Board –
1
IC201
tk
(OSCO)
4.1 Vp-p
484 ns
3.8 Vp-p
8 MHz
34
• IC Block Diagrams
– MAIN Board –
– MAIN Board –
IC621
SN74LV74APWR
IC628
MSM54V16258BSL-40TS-K
14
1
2 3
4
5
6
7
13 12 11
10
9
8
VCC
GND
CK
CLR
CK
CLR
Q
PR
Q
Q
PR
Q
D
D
NC
A8
A7
A6
A5
A4
VSS
A0
A1
A2
A3
VCC
VCC
DQ0
DQ1
DQ2
DQ3
VCC
DQ4
DQ5
DQ6
DQ7
WE
RAS
NC
28
26
27
23
24
25
18
20
19
22
21
2
1
4
3
6
5
8
7
10
9
VSS
DQ15
DQ14
DQ13
DQ12
VSS
DQ11
DQ10
DQ9
DQ8
43
44
41
42
39
40
37
38
35
36
31
I/O
SELECTOR
OUTPUT
BUFFER
INPUT
BUFFER
OUTPUT
BUFFER
INPUT
BUFFER
SENSE
AMPLIFIER
COLUMN
DECODERS
MEMORY
CELLS
WORD
DRIVERS
ROW
DECODERS
COLUMN
ADDRESS
BUFFERS
LCAS
30
UCAS
29
OE
I/O
CONTROLLER
I/O
CONTROLLER
15 16
17
11 – 14
NC
34 – 32
ROW
ADDRESS
BUFFERS
INTERNAL
ADDRESS
COUNTER
COUNTER
REFRESH
CONTROL
CLOCK
TIMING
GENERATOR
35
– AUDIO Board –
IC309
TC7W74F
IC401, 501
CXA8042AS
6
CLR
7
PR
8
VCC
5
Q
R
S
Q
3
Q
2
D
4
GND
1
CK
Q
D
C
1
2
3
4
4
5
6
7
8
9
10
11
12
13
14
13
14
28
27
26
25
25
24
23
22
21
20
19
18
17
16
15
15
SWITCHING
CIRCUIT
CONSTANT
CURRENT
CIRCUIT
REFERENCE
VOLTAGE
CIRCUIT
CONTROL
CIRCUIT
I01+
IN2–
IN2+
NC
IN1+
IN1–
IN1–
NC
C4
C4
C3
GND2
GND2
VEE2
VEE1
C6
C5
CIREF
I02–
NC
I01–
I02+
NC
VCC2
C2
C1
C1
VCC1
VREF
VCNT
GND1
RIREF
36
(1)
COVER SECTION
SECTION 5
EXPLODED VIEWS
The components identified by
mark 0 or dotted line with mark
mark 0 or dotted line with mark
0 are critical for safety.
Replace only with part number
specified.
Replace only with part number
specified.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
• Hardware (# mark) list and accessories and
packing materials are given in the last of the
electrical parts list.
electrical parts list.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color Cabinet's Color
7
7
3
7
8
4
5
6
4
5
1
2
#1
#1
Front panel section
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
X-4952-805-1 PANEL ASSY, LOADING (BLACK)
1
X-4952-806-1 PANEL ASSY, LOADING (SILVER)
2
3-704-515-31 SCREW (BV/RING)
3
4-210-291-01 SCREW (CASE3 TP2) (AEP: BLACK)
3
4-210-291-11 SCREW (CASE3 TP2) (AEP: SILVER)
3
4-210-082-01 SCREW (CASE) (UK)
4
4-970-123-11 FOOT (F50180S) (BLACK)
4
4-970-123-31 FOOT (F50180S) (SILVER)
5
4-972-889-01 CUSHION
6
1-792-598-11 WIRE (FLAT TYPE) (10 CORE)
7
4-227-843-01 SCREW (TP), FLAT HEAD (AEP: BLACK)
7
4-227-843-11 SCREW (TP), FLAT HEAD (AEP: SILVER)
7
4-210-082-01 SCREW (CASE) (UK)
* 8
4-997-138-02 COVER (4095269) (BLACK)
* 8
4-997-138-42 COVER (4095269) (SILVER)
Click on the first or last page to see other SCD-XB940 service manuals if exist.