Sony XR-1800 Service Manual ▷ View online
XR-1800
– 19 –
– 20 –
5-4.
SCHEMATIC DIAGRAM – MAIN Section (2/2) –
•
See page 13 for IC Block Diagram.
(Page 22)
XR-1800
– 21 –
– 22 –
5-5.
PRINTED WIRING BOARD – PANEL Section –
• Semiconductor
Location
Ref. No.
Location
D4
B-9
D900
C-10
D901
C-7
D902
C-6
D903
C-8
IC900
B-9
5-6.
SCHEMATIC DIAGRAM – PANEL Section –
• Waveform
2
IC900
#™
(OSC)
2.2 Vp-p
15
µ
s
(Page 20)
– 23 –
•
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 terminal Not used (fixed at “L”)
19
AMP-ON
O
Standby on/off signal output to the power amplifier (IC500) “L”: standby, “H”: amp on
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 Not used (open)
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
5-7.
IC PIN FUNCTION DESCRIPTION
– 24 –
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 terminal Not used (open)
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)
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