Sony XR-4750RDS / XR-C450RDS Service Manual ▷ View online
– 35 –
1
TUNMUT
O
Tuner muting control pin
At muting: “H”
2
AMPON
O
Power amp power supply control pin
Illumination power supply control pin
3
ILLON
O
At PW SEL on: ACC on: “H”
At PW SEL off: Power on: “H”
At PW SEL off: Power on: “H”
4
PW ON
O
System power supply control pin
5
AMPMUT
O
Power amp muting control pin
At muting: “L”
6
RC IN1
I
Rotary remote commander input pin (A/D input)
7
VDD
–
Power supply
8
X IN
I
Main system clock input pin (8 MHz)
9
X OUT
O
Main system clock output pin (8 MHz)
10
GND
–
GND
11
XT IN
I
Sub system clock input pin (32.768 kHz)
12
XT OUT
O
Sub system clock output pin (32.768 kHz)
13
EX2
–
Connected to GND
14
RESET
I
Reset input pin
15
RDSCKI
I
RDS clock input pin
16
BU IN
I
Back up power supply detection pin
17
KEYACK
O
Key acknowledge signal input pin
18
VOLSO
O
Data output pin to electrical volume
19
VOLCKO
O
Clock output pin to electrical volume
20
VOLCE
O
Chip enable output pin to electrical volume
21
TAPMUT
O
Tape muting control pin
At muting: “H”
22
LM LOD
O
Loading motor control pin (loadig direction)
23
LM EJ
O
Loading motor control pin (eject direction)
24
AMSON
O
At AMS: “L”
25
N ROUT
O
Forward/reverse control pin
26
AMSIN
I
Tape music with/without detection pin
“L”: with music
27
PLLSO
O
PLL data output pin
28
PLLCKO
O
PLL clock output pin
29
PLLCE
O
PLL chip enable output pin
30
RDSSI
I
RDS data input pin
31
AD ON
O
Power supply control pin for A/D conversion
DOLBY control input/output pin (Fixed at “H” in this set)
32
DOLON
I/O
At initial mode: valid/invalid selection input of DOLBY function
At normal mode: DOLBY on/off output
At normal mode: DOLBY on/off output
METAL control input/output pin
33
MTLON
I/O
At initial mode: valid/invalid selection input of METAL function
At normal mode: METAL on/off output
At normal mode: METAL on/off output
“H”: on
34
CM ON
O
Capstan motor control pin
35
TAPON
O
Tape power supply control pin
36
ACCON
I
Accessory voltage detection pin
37
PLLSI
I
PLL data input pin
6-5.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501
MN1884820S4G (XR-4750RDS), MN1886426S4H (XR-C450RDS) (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Function
– 36 –
Pin No.
Pin Name
I/O
Function
38
BEEP
O
Beep sound output pin
39
LCDCKO
O
LCD clock output pin
40
LCDSO
O
LCD data output pin
41
LCDINH
O
LCD brank indication control pin
42
LCDCE
O
LCD chip enable output pin
43
UNICKO
O
Clock output pin (for SONY BUS) (C450RDS only)
44
UNICKI
I
Clock input pin (for SONY BUS) (C450RDS only)
45
UNISI
I
Data input pin (for SONY BUS) (C450RDS only)
46
UNISO
O
Data output pin (for SONY BUS) (C450RDS only)
47
VDD
–
Power supply
48
AVDD
–
Power supply
49
AVREF+
–
A/D reference voltage input pin
50, 51
KEYIN1,KEYIN0
I
Key input pin (A/D input)
52
D-BASS
I
D-BASS switch input pin (A/D input)
53
KEYSEL
I
Key function setting pin (A/D input)
54
DSTSEL
I
Destination setting pin (A/D input)
55
RC IN0
I
Rotary remote commander input pin (A/D input)
56
VSM1
I
FM/AM multi-pass detection pin
57
VSM0
I
FM/AM signal meter voltage detection pin (A/D input)
58
AVREF–
–
A/D reference voltage input pin
59
AVSS
–
GND
60
GND
–
GND
61
BUSON
O
BUS ON control signai output pin (for SONY BUS) (C450RDS only)
62
SYSRST
O
System reset signal output pin (C450RDS only)
63
SEKOUT
O
SEEK control signal output pin
64
TUNON
O
Tuner power supply control pin
65
FM ON
O
FM power supply control pin
66
MUT
O
System muting control pin
At muting: “H”
67
AF SEK
O
AF seek control signal output pin
68
COLOR
I
Illumination color setting pin
“L”: amber, “H”: green
69
NOSESW
I
Front panel removal or attaching detection pin
70
ST IN
I/O
Stereo detection signal input and forced monaural signal output pin
71
SD IN
I
Station detection signal input pin
72
REL T
I
Reel table rotation detection pin
73-76
POS3-POS0
I
Tape position detection pin
77
PW SEL
I
Power select switch input pin
78
TELMUTE
I
Telephone muting detection pin
“L”: 20 dB audio muting
79
TEST
I
Test mode setting pin
80
ILLIN
I
ILLIN signal detection pin
– 37 –
NOTE:
•
-XX and -X mean standardized parts, so they
may have some difference from the original
one.
may have some difference from the original
one.
•
Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color
Cabinet's Color
•
Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
•
The mechanical parts with no reference num-
ber in the exploded views are not supplied.
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.
packing materials are given in the last of the
electrical parts list.
SECTION 7
EXPLODED VIEWS
•
Abbreviation
G: German
G: German
(1) CHASSIS SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
3-009-294-01 PANEL, SUB
2
3-935-003-01 SPRING, TORSION
3
3-932-205-21 DOOR, CASSETTE
4
X-3367-636-1 LOCK ASSY
* 5
3-009-306-01 SHEET, INSULATING
* 6
A-3309-739-A MAIN BOARD, COMPLETE (C450RDS: AEP, UK)
* 6
A-3309-743-A MAIN BOARD, COMPLETE (C450RDS: G)
* 6
A-3309-825-A MAIN BOARD, COMPLETE (4750RDS: AEP, UK)
* 6
A-3309-829-A MAIN BOARD, COMPLETE (4750RDS: G)
7
3-915-923-01 SCREW, GROUND POINT
* 8
X-3373-269-1 COVER ASSY (ISO)
9
1-777-989-11 CORD (WITH CONNECTOR)
(AMP REM/TEL MUTE) (C450RDS)
9
1-777-989-31 CORD (WITH CONNECTOR) (TEL MUTE)
(4750RDS)
* 10
3-009-307-01 BRACKET (IC)
* 11
3-009-293-01 HEAT SINK (C450RDS)
* 11
3-010-471-01 HEAT SINK (4750RDS)
12
9-911-840-XX CUSHION (U)
* 13
3-009-813-01 CHASSIS
14
3-937-650-01 PLATE (C), GROUND
* 15
A-3309-740-A POWER BOARD, COMPLETE
16
1-782-092-11 CORD (WITH CONNECTOR) (POWER)
17
1-782-093-11 CORD (WITH CONNECTOR) (SPEAKER)
* 18
3-012-859-01 CAP, RUBBER (25)
* 19
3-012-105-01 BRACKET (HS)
F801
1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE) (10A)
#3
6
MG-25B-136
8
F801
Front panel ass’y
#1
#2
#2
1
4
3
2
13
5
7
14
#2
#2
#2
11
18
12
19
10
16
17
9
9
#2
15
4750RDS
C450RDS
#2
– 38 –
SONY
(2) FRONT PANEL SECTION
104
105
103
111
112
106
107
109
108
114
LCD901
not supplied
(KEY board)
(KEY board)
#5
#5
117
101
PL903
113
PL904
116
115
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
101
3-009-301-01 BUTTON (D-BASS)
103
3-009-299-01 BUTTON (L2) (+. –) (C450RDS)
103
3-010-472-01 BUTTON (L2) (+. –) (4750RDS)
104
3-009-304-01 BUTTON (RELEASE)
105
3-932-475-01 SPRING (RELEASE)
106
3-904-194-01 EMBLEM (NO. 2.5), SONY (C450RDS)
107
X-3373-662-1 PANEL SUB ASSY (C450RDS)
107
X-3373-663-1 PANEL SUB ASSY (4750RDS)
108
3-009-300-01 BUTTON (SOURCE)
109
3-009-297-01 BUTTON (L)
(+
+ ). SEEK AMS. = 0 –. r. OFF. r. SEL. MUTE)
(C450RDS)
109
3-009-867-01 BUTTON (L)
(+
+ ). SEEK AMS. = 0 –. r. OFF. r. SEL. MUTE)
(C450RDS)
111
3-009-308-01 BUTTON (1-3) (
6. 1. 2. 3) (C450RDS)
111
3-010-473-01 BUTTON (1-3) (
6. 1. 2. 3) (4750RDS)
112
3-009-309-01 BUTTON (4-6) (SENS. 4. 5. 6) (C450RDS)
112
3-010-474-11 BUTTON (4-6) (SENS. 4. 5. 6) (4750RDS)
113
3-009-298-01 BUTTON (R) (PTY. AF/TA. – DISK +) (C450RDS)
113
3-009-314-01 BUTTON (R) (2) (PTY. AF/TS. –DISK+) (4750RDS)
* 114
3-010-282-01 PLATE (LCD), GROUND
* 115
3-009-305-01 SHEET (REFLECTOR)
* 116
3-009-302-01 PLATE (LCD), LIGHT GUIDE
* 117
3-009-303-01 HOLDER (LCD)
118
3-009-295-01 PANEL, FRONT BACK (C450RDS)
118
3-010-519-01 PANEL, FRONT BACK (4750RDS)
LCD901 1-801-587-11 DISPLAY PANEL, LIQUID CRYSTAL
PL903
PL903
1-517-633-21 LAMP, PILOT (LCD BACK LIGHT)
PL904
1-517-633-21 LAMP, PILOT (LCD BACK LIGHT)
118
Click on the first or last page to see other XR-4750RDS / XR-C450RDS service manuals if exist.