Sony XR-4890 (serv.man2) Service Manual ▷ View online
– 27 –
6-6. IC PIN FUNCTION DESCRIPTION
• IC501 MASTER U-COM (MN101C12GTA1/MN101C12GTB)
Pin No.
1
AVREF-
–
Basic voltage (- side) of AD conversion input
2
VSM
I
FM/AM common signal meter A/D conversion input terminal
3
KEYIN1
I
4
KEYIN0
I
5
DBAS IN
I
Position detecting AD input terminal of D-BASS
6
DSTSEL
I
Terminal for setting to select the value of destination
7
FUNC-SEL
I
Function selecting (AD conversion) input
8
NCO
O
Not used
9
RCIN0
I
Rotary commander (AD conversion) input
10
AVREF+
I
Basic voltage (+side) of AD conversion input
11
VDD
–
Power supply
12
OSC OUT
–
13
OSC IN
–
14
GND
–
Ground
15
XT IN
–
16
XT OUT
–
17
GND
–
Ground
18
RCIN1
I
Rotary commander shift input
19
SYSRST
O
SYSTEM RESET control output
20
BUSON
O
BUS ON control output
21
UNISO
O
Serial data output
22
UNISI
I
Serial data input
23
UNICKO
O
Serial clock output
24
UNICKI
I
Serial clock input
25
NCO
O
Not used
26
KEYACK
I
Key input acknowledge
27
NOSESW
I
Removing/attaching front panel detection input
28
BU_IN
I
BACK-UP detection input terminal
29
SIRCS
I
Remote control input
30
TELMUT
I
TELEPHONE MUTE detection input
31
TESTIN
I
Test mode setting input terminal
32
RAMBU
I
Reset detection input of RAM
33
RESET
I
Reset input terminal
34
VOLMUT
O
Not used
35
BEEP
O
Control output for buzzer
36
AMPMUT
O
Power amplifier mute control output terminal
37
AMPON
O
Power amplifier STANDBY control terminal
38
PLLCKD
O
PLL CLK output terminal
39
PLLCE
O
PLL CE output terminal
40
PLLSO
O
PLL DATA output terminal
41
PLLSI
I
PLL DATA input terminal
42
LCDSD
O
LCD serial data output
43
LCDCE
O
LCD chip enable output terminal
44
LCDCKD
O
LCD serial clock output
45
VOLSO
O
Electrical volume serial data output
46
NCO
O
Not used
47
VOLCKO
O
Electrical volume serial data output
48
ACCIN
I
Accessory power supply detection input
49
MUT
O
System MUTE control output
Pin Name
I/O
Function
KEY (AD conversion) input
Radiator (18.432 MHz) connecting terminal
Sub clock (for clock) radiator (32 kHz) connecting terminal
– 28 –
Pin No.
Pin Name
I/O
Function
50
NCO
O
Not used
51
AMSON
O
“L” is output in AMS mode
52
NROUT
O
FOR/REV control output
53
MTLON
I/O
Metal control input/output
54
TAPMUT
O
Tape mute control output
55
DOLON
I/O
Dolby control input/output
56
AMSIN
I
Input to detect existence of song during AMS mode
57 to 75
NCO
O
Not used
76
ST
I/O
Combination stereo input and monaural output
77
SD_IN
I
SIGNAL DETECTOR input terminal
78
REIN 1
I
79
REIN 0
I
80
AD ON
O
Power supply control output of AD conversion
81
PW SEL
I
Power selection initialise
82
ILLON
O
Illumination power supply control output
83
REL
I
Input to detect rotation of reel table
84
POS3
I
85
POS2
I
86
POS0
I
87
POS1
I
88
LM LOD
O
Loading motor control output (to a direction of loading)
89
LM EJ
O
Loading motor control output (to a direction of ejection)
TAPE power supply control output
When ‘on’ is output, “H” is output, otherwise when ‘off’ is output, “L” is output.
91
CM ON
O
Capstan motor control signal output terminal of TAPE
92
PW ON
O
System power supply control output
93
FM ON
O
FM power supply control output terminal
94
TUNON
O
TUNER power supply control output terminal
95
DAVSS
–
Ground
96 to 99
NCO
O
Not used
100
DAVDD
–
Not used (Power supply for DA converter)
Tape position signal detection input
Rotary encoder input terminal
90
TAPON
O
– 29 –
SECTION 7
EXPLODED VIEWS
(1) CHASSIS SECTION
NOTE:
• -XX, -X mean standardized parts, so they may have
some difference from the original one.
• Items marked “*” are not stocked since they are
seldom required for routine service. Some delay
should be anticipated when ordering these items.
should be anticipated when ordering these items.
• Color Indication of Appearance Parts Example:
KNOB, BALANCE (WHITE) . . . . (RED)
Â
Â
Parts color Cabinets color
• The mechanical parts with no reference number in
the exploded views are not supplied.
• Hardware (# mark) list and accessories and pack-
ing materials are given in the last of this parts list.
The components identified by
mark
mark
! or dotted line with mark
! are critical for safety.
Replace only with part number
specified.
Replace only with part number
specified.
Les composants identifiés par une
marque
marque
! sont critiques pour la
sécurité.
Ne les remplacer que par une
piéce portant le numéro spécifié.
Ne les remplacer que par une
piéce portant le numéro spécifié.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
* 11
3-031-026-01 HEAT SINK
12
3-935-014-01 CUSHION (U)
* 13
3-009-813-41 CHASSIS
14
3-012-859-01 CAP (25), RUBBER
15
3-937-650-01 PLATE (C), GROUND
F781
1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE)(10A)
TU1
A-3220-689-A TUNER UNIT TUX-010/2
1
3-031-022-01 PANEL, SUB
2
3-935-003-01 SPRING, TORSION
3
3-027-437-21 DOOR, CASSETTE
4
X-3370-437-1 LOCK ASSY
* 5
3-033-846-01 INSULATED PLATE
* 6
A-3317-387-A MAIN BOARD, COMPLETE
7
3-915-923-01 SCREW, GROUND POINT
* 8
X-3373-270-1 COVER ASSY
9
1-776-207-31 CORD (WITH CONNECTOR)(POWER)
* 10
3-018-390-01 BRACKET (IC)
14
8
7
6
5
4
3
2
1
13
12
11
10
15
#3
#2
#2
#2
#2
#2
#2
#1
Front panel ass’y
#4
F781
MG-25F-136
9
– 30 –
(2) FRONT PANEL SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
* 62
3-030-824-01 PLATE, LIGHT GUIDE
63
1-694-508-11 CONDUCTIVE BOARD, CONNECTION
* 64
3-030-825-01 HOLDER (LCD)
65
3-030-827-01 PANEL, FRONT BACK
66
X-3377-055-1 FRONT PANEL ASSY
* 67
3-030-840-01 PLATE (B), GROUND
LCD901 1-803-496-11 DISPLAY PANEL, LIQUID CRYSTAL
51
3-030-838-01 BUTTON (RELEASE)
52
3-030-832-01 LEVER (S/A)
53
3-932-475-01 SPRING (RELEASE)
54
3-030-834-01 BUTTON (M/S)
55
3-030-835-01 BUTTON (1-6)
56
3-031-027-11 BUTTON (P/P/A)
57
3-030-831-01 BUTTON (SOURCE)
58
3-030-830-01 KNOB (VOL)
60
3-030-837-01 BUTTON (D-BASS)
* 61
3-030-839-01 SHEET (REFLECTOR)
57
58
60
65
54
66
53
51
52
56
#5
#5
#5
C
B
C
B
A
A
67
55
not supplied
(KEY board)
(KEY board)
64
62
61
67
63
LCD901
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