Sony CDX-A251C Service Manual ▷ View online
37
CDX-A251C
60
UNISCK
O
SONY-BUS clock signal output
61
611_SEL
I
CD mechanism deck setting pin (Fixed at H: 611WA in this set)
62
WMA
I
WMA select signal input (Fixed at H in this set)
63
NCO
O
Not used. (Open)
64
SIRCS
I
Remote controller signal (infrared rays) input
65 to 67
NCO
O
Not used. (Open)
68
FLASH_W
I
Memory mode select signal input (Fixed at H in this set)
69, 70
NCO
O
Not used. (Open)
71
RC_IN1
I
Rotary commander shift key signal input
72
ACC_IN
I
Accessory power supply detection signal input
73
TESTIN
I
Test mode detection signal input
74
TELATT
I
Telephone attenuator detection signal input (AEP, UK, E, MX model)
75
NCO
O
Not used. (Open)
76
XKEYON
O
A/D converter power supply control signal output
77
RESET
I
Reset signal input
78
NCO
O
Not used. (Open)
79
XOUT
O
Sub-clock signal output (32.768 kHz)
80
XIN
I
Sub-clock signal input (32.768 kHz)
81
VSS1
—
Ground
82
OSCIN
I
Main-clock signal input (18.432 MHz)
83
OSCOUT
O
Main-clock signal output (18.432 MHz)
84
VCC3
—
Power supply pin (+3.3 V)
85
DEMOSEL
I
Demo select signal input (Fixed at H in this set)
86
ATT
O
Audio mute control signal output
87
BUSON
O
Bus ON signal output
88
SYSRST
O
System reset signal output
89
EJECT_OK_SW
O
Eject OK signal output
90 to 92
NCO
O
Not used. (Open)
93
Z-MUTE
I
Z mute signal input
94 to 97
NCO
O
Not used. (Open)
98
CD_ON
I
CD mechanism deck servo power control request signal input
99
CDM_ON
I
CD mechanism deck power control request signal input
100
NCO
O
Not used. (Open)
Pin No.
Pin Name
I/O
Pin Description
38
CDX-A251C
SECTION 4
EXPLODED VIEWS
Ref. No.
Part No.
Description
Remark
4-1. MAIN SECTION
Ref. No.
Part No.
Description
Remark
NOTE:
• The mechanical parts with no reference
number in the exploded views are not supplied.
• Items marked “*” are not stocked since
they are seldom required for routine service.
Some delay should be anticipated
when ordering these items.
Some delay should be anticipated
when ordering these items.
• -XX and -X mean standardized parts, so
they may have some difference from the
original one.
original one.
• Color Indication of Appearance Parts
Example :
KNOB, BALANCE (WHITE) ... (RED)
Parts Color Cabinet’s Color
• Accessories are given in the last of this
parts list.
• Abbreviation
CND : Canadian model
MX : Mexican model
MX : Mexican model
R
R
1
X-2059-813-1 PANEL ASSY, SUB
2
3-042-244-11 SCREW (T)
3
X-3383-739-1 LOCK ASSY (S)
4
2-050-124-01 SCREW +BTT 2.6X5
5
A-1151-852-A MAIN BOARD, COMPLETE (AEP,UK)
5
A-1152-503-A MAIN BOARD, COMPLETE (US,CND)
5
A-1152-671-A MAIN BOARD, COMPLETE (E,MX)
6
2-021-848-01 SHEET (TU), GROUND
7
1-776-207-82 CORD (WITH CONNECTOR) (POWER)
(US,CND,E,MX)
7
1-776-527-61 CORD (WITH CONNECTOR) (ISO) (POWER)
(AEP,UK)
FU601
1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE) 10A
TU1
A-3220-961-B TUNER UNIT (TUX-032)
#1
7-685-792-09 SCREW +PTT 2.6X6 (S)
#2
7-685-790-01 SCREW +PTT 2.6X4 (S)
#3
7-685-793-09 SCREW +PTT 2.6X8 (S)
FU601
not supplied
not supplied
TU1
not supplied
#1
#1
#1
#2
#3
#1
MG-611WA-186//Q
A
A
B
B
1
2
3
4
7
5
6
not supplied
The components identified by
mark 0 or dotted line with mark
0 are critical for safety.
Replace only with part number
specified.
mark 0 or dotted line with mark
0 are critical for safety.
Replace only with part number
specified.
Les composants identifiés par une
marque 0 sont critiques pour
la sécurité.
Ne les remplacer que par une piéce
portant le numéro spécifié.
marque 0 sont critiques pour
la sécurité.
Ne les remplacer que par une piéce
portant le numéro spécifié.
39
CDX-A251C
4-2. FRONT PANEL SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
51
A-1151-854-A PANEL OVERALL ASSY, FRONT (AEP,UK)
51
A-1152-505-A PANEL OVERALL ASSY, FRONT (US,CND)
51
A-1152-681-A PANEL OVERALL ASSY, FRONT (E,MX)
52
X-2102-797-1 BUTTON ASSY (S)
53
2-639-881-01 SPRING (RELEASE)
54
2-634-993-02 PLATE (CD-R), LIGHT GUIDE
55
2-635-033-01 PLATE (RING), LIGHT GUIDE
56
2-634-994-02 PLATE (CD-L), LIGHT GUIDE
57
X-2103-571-1 PANEL (SV) ASSY, FRONT (AEP,UK)
57
X-2103-572-1 PANEL (SV) ASSY, FRONT (E,MX)
57
X-2103-573-1 PANEL (SV) ASSY, FRONT (US,CND)
58
3-251-320-01 EMBLEM (NO. 2.5), SONY
59
X-2103-036-2 KNOB (SV) ASSY
60
2-659-192-01 SPRING (COIL)
61
1-780-320-11 CONDUCTIVE BOARD, CONNECTION
62
2-634-998-01 ILLUMINATOR (LCD)
63
2-634-997-01 PLATE (LCD), LIGHT GUIDE
64
2-634-951-01 PANEL, FRONT BACK
65
3-250-543-21 SCREW (+B P-TITE M2)
66
X-2102-503-1 CASE ASSY (for FRONT PANEL)
LCD901 1-805-936-11 DISPLAY PANEL, LIQUID CRYSTAL
RE901
RE901
1-478-474-21 ENCODER, ROTARY
(VOLUME/PUSH DIAL SELECT)
LCD901
not supplied
not supplied
not supplied
(JACK board)
(JACK board)
not supplied
(KEY board)
(KEY board)
RE901
51
53
61
62
63
64
65
65
not supplied
not supplied
not supplied
not supplied
not supplied
52
54
55
56
57
59
60
58
66
40
CDX-A251C
4-3. CD MECHANISM SECTION (1)
(MG-611WA-186//Q)
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
101
A-3372-444-C CHASSIS (T) SUB ASSY
102
3-253-729-11 SPRING (LR), TENSION COIL
103
3-257-892-12 SPRING (DAMPER), COIL (GREEN)
104
3-257-892-01 SPRING (DAMPER), COIL (NATURAL)
105
2-345-767-11 SPRING (KF60), TENSION
106
3-259-033-01 DAMPER (S)
107
2-587-505-01 SCREW
108
A-1132-412-A SERVO BOARD, COMPLETE
#4
7-627-552-87 SCREW, PRECISION +P 1.7X2.2
not supplied
(SENSOR board)
(SENSOR board)
not supplied
not supplied
not supplied
not supplied
#4
101
102
103
104
105
106
107
108
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