Sony XR-1890 Service Manual ▷ View online
– 21 –
• IC Block Diagram
– MAIN Board –
– MAIN Board –
IC450
LC75372E
2
1
4
3
6
5
8
7
10
9
12
11
14
13
16
15
15
43
44
41
42
39
40
37
38
35
36
33
34
23
24
25
26
19
20
21
22
29
30
31
32
27
28
17
18
DECODER
LATCH
CONTROL
SHIFT
REGISTER
ROUT
RFIN
RFOUT
RROUT
RVREF
VREF
LVREF
LROUT
LFOUT
LFIN
LOUT
R2
R1
TEST
VSS
NC
CL
DI
CE
L2
VDD
L1
LT3
LT2
L10dBOUT
LT1
LIN
LCT2
LCT1
L10dBIN
LSELO
L3
NC
RT3
RT2
RT1
RIN
R10dBOUT
RCT2
RCT1
R10dBIN
RSELO
NC
R3
+
–
–
+
–
–
+
–
–
+
–
LVREF
LVREF
RVREF
LVREF
LVREF
LVREF
LVREF
LVREF
LVREF
+
–
+
–
+
–
+
–
+
–
+
–
–
RVREF
RVREF
RVREF
RVREF
RVREF
RVREF
RVREF
+
–
–
+
–
–
+
–
–
+
–
–
– 22 –
5-7.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC1 LC72322N-9400 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Function
1
XIN
I
System clock input terminal (4.5 MHz)
2
TEST2
I
Connected to ground
3
NC
I
Not used (fixed at “H”)
4
AM-SD
I
AM signal meter voltage detection input from the FM/AM tuner unit (TU100) “H” active
5
FM-SD
I
FM signal meter voltage detection input from the FM/AM tuner unit (TU100) “H” active
6
STEREO
I
Stereo detection signal input from the FM/AM tuner unit (TU100) (Commonly used for stereo
display input) FM stereo detection at input of “L”
display input) FM stereo detection at input of “L”
7
MOTOR
O
Capstan/reel motor (M901) drive signal output “H”: motor on
8
AMP-MUTE2
O
Muting control signal output to the power amplifier (IC500) “L”: muting on
9
MW/SW
O
MW/SW selection signal output terminal “H”: MW, “L”: SW Not used (fixed at “H”)
10
—
O
Not used (open)
11
BEEP
O
Beep sound signal output terminal “H” active
12
POWER-ON
O
Power on/off control signal output “H”: power on
13
ILL-ON
O
Power on/off control signal output for the liquid crystal display driver (IC900), illumination lamp
and back light lamp “H”: power on
and back light lamp “H”: power on
14
N/R
I
Tape direction switch (S901) input terminal “H”: forward side, “L”: reverse side
15
TAPE-IN
I
Tape in detection switch (S903) input terminal “L”: tape in
16
FF-REW
I
FF/REW detection switch (S902) input terminal “L”: FF/REW mode
17
K1
I
Key matrix return signal input terminal Not used (fixed at “L”)
18
K0
I
Key matrix return signal input for the frequency select switch (S1)
Used for the E model only
Used for the E model only
19
AMP-ON
O
Standby on/off signal output terminal “L”: standby, “H”: amp on Not used (open)
20
SEEK
O
Seek control signal output to the FM/AM tuner unit (TU100) “H” active
21
SEEK
O
Seek control signal output terminal “L” active Not used (open)
22
LOCAL/DX
O
Local/DX selection signal output to the FM/AM tuner unit (TU100) “L”: DX, “H”: local
23, 24
—
O
Not used (open)
25
T2
O
26
T1
O
Key matrix scan signal output terminal Not used (open)
27
T0
O
28
VOL-CE
O
Chip enable signal output to the electrical volume (IC450) “H” active
29
VOL-DI
O
Serial data output to the electrical volume (IC450) “H” active
30
VOL-CL
O
Serial data transfer clock signal output to the electrical volume (IC450)
31
VDD
—
Power supply terminal (+5V)
32
MUTE-REQ
I
Muting request signal input terminal (“H” active) “L”: accessory on, “H”: accessory off
33
BAND-KEY
I
TUNER switch (S900) input terminal “L” is input when pressing the switch
34
PANEL-IN
I
Detects the removal of the attaching and removing type front panel block “L”: attaching
35
NC
I
Not used (fixed at “L”)
36 to 40
—
O
Not used (open)
41
MUTE
O
Audio muting on/off control signal output terminal “H”: muting on
42
—
O
Not used (open)
43
AMP-MUTE
O
Amp muting on/off control signal output terminal “L”: muting on Not used (open)
44
ANT-REM
O
Control signal output for the external power antenna and external amplifier “H” active
45 to 48
—
O
Not used (open)
49
KS2
O
50
KS1
O
Key matrix scan signal output terminal
51
KS0
O
– 23 –
Pin No.
Pin Name
I/O
Function
52
—
O
Not used (open)
53
LCD-CLK
O
Serial data transfer clock signal output to the liquid crystal display driver (IC900)
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
“H”: accessory on, “L”: accessory off (hold mode)
“H”: accessory on, “L”: accessory off (hold mode)
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)
– 24 –
(1)
GENERAL SECTION
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
3-022-475-02 PANEL, SUB
2
X-3367-636-1 LOCK ASSY
3
3-924-404-01 DOOR, CASSETTE
4
3-377-892-01 SPRING (C DOOR), TORSION
* 5
3-022-469-01 SPRING, GROUND
6
3-937-529-01 COVER (FF/REW)
7
3-937-528-01 COVER (EJECT)
8
3-376-464-11 SCREW, GROUND POINT
* 9
3-029-047-01 PLATE(C), GROUND
* 10
X-3375-529-1 COVER ASSY
* 11
3-022-470-01 BRACKET (IC)
12
1-776-207-41 CORD (WITH CONNECTOR) (POWER)
* 13
3-033-815-01 HEAT SINK
* 14
A-3317-518-A MAIN BOARD, COMPLETE
* 15
3-022-487-02 SHEET, INSULATING
* 16
3-022-476-02 CHASSIS, MAIN
17
1-790-649-11 CORD (WITH CONNECTOR) (AUDIO OUT)
F901
1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE) (10A)
10
13
14
15
16
5
1
2
6
7
8
9
11
#3
#15
#2
#2
#2
#2
#2
F901
Front panel section
#1
MG-36SZ9-32
17
4
3
12
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