Sony XR-1790 (serv.man2) Service Manual ▷ View online
21
Pin No.
Pin Name
I/O
Description
54
LCD-CE
O
Chip enable signal output to the liquid crystal display driver (IC900) “H” active
55
LCD-DATA
O
Serial data output to the liquid crystal display driver (IC900) “H” active
56
AM-ON
O
AM system power supply on/off control signal output terminal “H”: AM on
57
MONO
O
Not used (open)
58 to 60
—
O
Not used (open)
61
FM-ON
O
FM system power supply on/off control signal output terminal “H”: FM on
62
TUNER-ON
O
Tuner system power supply on/off control signal output terminal “H”: tuner on
Not used (open)
Not used (open)
63
MW/LW
O
MW/LW selection signal output terminal “L”: MW, “H”: LW Not used (open)
64, 65
—
O
Not used (open)
66
NC
I
Not used (fixed at “L”)
67
CE
I
Accessory switch on/off detection signal input terminal
“L”: accessory off (hold mode), “H”: accessory on
“L”: accessory off (hold mode), “H”: accessory on
68
RESET
I
System reset signal input terminal “L”: reset
69
KEY-IN
I
Key matrix return signal input terminal (A/D input)
70
IFIN
I
FM and AM intermediate frequency detection signal input from the FM/AM tuner unit (TU100)
71
NC
I
Not used (fixed at “L”)
72
BU-CHECK
I
Battery detect signal input terminal
73
VDD
—
Power supply terminal (+5V)
74
FMIN
I
FM local oscillator input from the FM/AM tuner unit (TU100)
75
AMIN
I
AM local oscillator input from the FM/AM tuner unit (TU100)
76
VSS
—
Ground terminal
77
EO
O
Main charge-pump control signal output terminal
78
—
O
Not used (open)
79
TEST1
I
Connected to ground
80
XOUT
O
System clock output terminal (4.5 MHz)
22
SECTION 6
EXPLODED VIEWS
• 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
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
(1) GENERAL SECTION
9
7
11
12
3
4
5
6
8
#3
#2
#2
#2
#2
#2
F901
Front panel section
MG-36SZ9-32
1
2
10
13
TU100
* 1
3-031-237-01 STOPPER (LCD)
* 2
3-031-238-01 PLATE, GROUND
3
3-937-529-01 COVER (FF/REW)
4
3-937-528-01 COVER (EJECT)
5
3-915-923-01 SCREW, GROUND POINT
6
3-029-047-01 PLATE (C), GROUND
* 7
A-3317-979-A MAIN BOARD, COMPLETE
* 8
3-022-470-01 BRACKET (IC)
* 9
3-022-477-01 HEAT SINK
10
1-776-207-41 CORD (WITH CONNECTOR) (POWER)
* 11
3-022-487-02 SHEET, INSULATING
* 12
3-022-476-03 CHASSIS, MAIN
* 13
3-022-472-01 COVER, TOP
F901
1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE) (10A)
TU100
A-3282-034-A TUNER UNIT (TUX-010 (E))
23
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
(2) FRONT PANEL SECTION
65
64
63
56
55
54
53
52
51
59
60
61
#5
LCD900
62
57
58
66
51
3-375-372-01 SPRING (F/R)
52
3-022-485-01 BUTTON (FF) (M)
53
3-022-486-01 BUTTON (REW) (m)
54
3-029-327-01 SPRING (EJECT)
55
3-022-483-01 BUTTON (EJECT) (Z)
56
3-031-236-01 PANEL, FRONT
57
3-924-404-01 DOOR, CASSETTE
58
3-377-892-01 SPRING (C DOOR), TORSION
59
3-022-480-01 BLOCK (A), BUTTON
(DSPL. 1. 2. 3. 4. 5. 6. LCL)
60
3-022-481-01 BLOCK (B), BUTTON (–. SEL. +.
– SEEK MANU +. LOUD. TUNER. OFF)
* 61
3-022-478-01 PLATE, LIGHT GUIDE
* 62
A-3294-547-A CONTROL BOARD, COMPLETE
* 63
3-022-471-01 PLATE (LCD), GROUND
* 64
3-024-264-01 ILLUMINATOR
* 65
3-022-482-01 PLATE (LCD), LIGHT GUIDE
* 66
3-027-172-01 INSLATED PLATE (L)
LCD900 1-803-137-11 DISPLAY PANEL, LIQUID CRYSTAL
24
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
(3) MECHANISM DECK SECTION-1
(MG-36SZ9-32)
101
3-938-660-01 LEVER, EJECT
102
3-392-950-01 SPRING
103
3-392-951-01 SPRING
104
3-375-384-01 HOLDER (X), CASSETTE
* 105
3-392-921-01 LOCK ASSY, EJECT CAM
106
3-392-972-01 HOOKER, TAPE
107
3-392-953-01 SPRING
108
3-392-969-01 LINK, RETURN
* 109
3-392-932-01 PLATE, CENTER
110
3-392-961-01 SPRING (B)
111
3-375-383-01 HANGER (X), CASSETTE
112
3-372-243-01 LINK (B), SELECTOR
113
3-392-954-01 SPRING
114
3-392-994-01 ROLLER, PROGRAM
* 115
3-392-933-01 LEVER (B), CHANGE
116
3-392-948-01 SPRING
117
3-938-658-01 LEVER, FF
118
3-938-659-01 LEVER, REW
119
3-392-917-01 SPRING
* 120
3-392-935-01 ARM, LOCK
* 121
3-372-242-01 BRACKET ASSY (D), LEVER
122
3-392-970-01 CHASSIS, SWITCH
(DIRECTION SWITCH BOARD)
* 123
4-908-792-11 SCREW (B2)
* 124
3-022-479-01 BRACKET (MD)
S901
1-692-502-11 SWITCH, SLIDE (DIRECTION)
123
122
101
102
103
104
112
121
113
114
115
120
119
118
117
116
116
109
110
111
106
105
107
108
not supplied
not supplied
#10
#4
#9
#14
#12
#13
#13
S901
124
#4
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