Sony XR-1800RD Service Manual ▷ View online
21
5-7.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC1 MN1884820SF (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
TUNMUT
O
FM audio signal muting control output terminal “H”: muting on
2
AMPON
O
Standby control signal output to the power amplifier (IC500) “L”: standby
3
ILLON
O
Power supply on/off control signal output terminal at the liquid crystal display driver (IC900),
illumination lamp and back light lamp “H”: power on
illumination lamp and back light lamp “H”: power on
4
PW ON
O
Main system power supply on/off control signal output terminal “H”: power on
5
AMPMUTE
O
Muting control signal output to the power amplifier (IC500) “L”: muting on
6
NIL
I
Not used (fixed at “L”)
7
VDD1
—
Power supply terminal (+5V)
8
X IN
I
Main system clock input terminal (8 MHz)
9
X OUT
O
Main system clock output terminal (8 MHz)
10
GND
—
Ground terminal
11
XT IN
I
Sub system clock input terminal (32.768 kHz)
12
XT OUT
O
Sub system clock output terminal (32.768 kHz)
13
EX2
I
Connected to ground
14
RESET
I
System reset signal input from the reset signal generator (IC50) and reset switch (S2)
“L” is input for several 100 msec after power on, then it changes to “H”
“L” is input for several 100 msec after power on, then it changes to “H”
15
RDSCKI
I
Serial data transfer clock signal input from the RDS decoder (IC150)
16
BU IN
I
Battery detect signal input terminal “H”: battery on
17
KEYACK
I
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function
and eject keys in the power off status On at input of “H”
and eject keys in the power off status On at input of “H”
18
VOLSO
O
Serial data output to the electrical volume (IC450)
19
VOLCKO
O
Serial data transfer clock signal output to the electrical volume (IC450)
20
VOLCE
O
Chip enable signal output to the electrical volume (IC450)
21
TAPE MUTE
O
Tape muting on/off control signal output terminal “H”: tape muting on Not used (open)
22 to 24
NCO
O
Not used (open)
25
AMS ON
O
Tape auto music sensor control signal output terminal
“L” is output to lower the gain for audio level at FF/REW Not used (open)
“L” is output to lower the gain for audio level at FF/REW Not used (open)
26
ATA ON
I
Not used (fixed at “H”)
27
TAPE IN
I
Tape in detection switch (S903) input terminal “L”: tape in
28
FF-REW IN
I
FF/REW detection switch (S902) input terminal “L”: FF/REW mode
29
N/R
I
Tape direction switch (S901) input terminal
“L: reverse direction, “H”: forward direction
“L: reverse direction, “H”: forward direction
30
RDSSI
I
Serial data input from the RDS decoder (IC150)
31
AD ON
O
Power supply on/off control signal output for the A/D converter “L”: power on
32, 33
NCO
O
Not used (open)
34
CM ON
O
Capstan/reel motor (M901) drive signal output terminal “H”: motor on
35
TAPE ON
O
Tape system power supply on/off control signal output terminal “H”: tape on
Not used (open)
Not used (open)
36
ACC IN
I
Accessory detect signal input terminal “L”: accessory on
37
PLLSI
I
PLL serial data input from the FM/AM PLL (IC121)
38
BEEP
O
Beep sound signal output terminal
39
PLLSO
O
PLL serial data output to the FM/AM PLL (IC121)
40
PLLCLK
O
PLL serial data transfer clock signal output to the FM/AM PLL (IC121)
41
PLLCE
O
PLL serial chip enable output to the FM/AM PLL (IC121)
42
LCD INH
O
Blank indicate control signal output to the liquid crystal display driver (IC900)
“L”: no display
“L”: no display
22
Pin No.
Pin Name
I/O
Description
43
LCD CE
O
Chip enable output to the liquid crystal display driver (IC900)
44
LCD CLK
O
Serial data transfer clock signal output to the liquid crystal display driver (IC900)
45
NCO
O
Not used (open)
46
LCD SO
O
Serial data output to the liquid crystal display driver (IC900)
47
VDD2
—
Power supply terminal (+5V)
48
AVDD
—
Power supply terminal (+5V) (for A/D converter)
49
AVREF+
I
Reference voltage input terminal (+5V) (for A/D converter)
50
KEYIN1
I
Key input terminal (A/D input) OFF, LOUD PTY, 6/5/3/2/4/1 ATA keys input (S950 to 957)
51
KEYIN0
I
Key input terminal (A/D input) AF/TA, TUNER BTM, SEEK MANU +/–, DSPL, LEVEL +,
SEL, LEVEL – keys input (S920 to 927)
SEL, LEVEL – keys input (S920 to 927)
52
KEYSEL1
I
Setting terminal for the key function (fixed at “L”)
53
KEYSEL0
I
Setting terminal for the key function (fixed at “L”)
54
DSTSEL1
I
Destination setting terminal (fixed at “L”)
55
DSTSEL0
I
Destination setting terminal (fixed at “L”)
56
NIL
I
Not used (fixed at “L”)
57
FM VSM
I
FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU100)
58
AVREF–
I
Reference ground terminal
59
AVSS
—
Ground terminal (for A/D converter)
60
GND
—
Ground terminal
61, 62
NCO
O
Not used (open)
63
SEEK OUT
O
Seek control signal output to the FM/AM tuner unit (TU100)
64
TUN ON
O
Tuner system power supply on/off control signal output terminal “H”: tuner on
65
FM ON
O
FM system power supply on/off control signal output terminal “H”: FM on
66
MUTE
O
Line muting control signal output terminal “H”: line muting on Not used (open)
67
AF SEEK
O
PLL low-pass filter time constant selection signal output at AF seek
“H” is output when AF seek
“H” is output when AF seek
68
NCO
O
Not used (open)
69
NOSESW
I
Detects the removal of the attaching and removing type front panel block “L”: attaching
70
ST IN
I/O
71
SD IN
I
Station detector detect input from the FM/AM tuner unit (TU100)
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
72
NIL
I
Not used (fixed at “L”)
73
PW SEL
I
Power select switch input terminal
“L”: halt mode, “H”: operation mode Not used (fixed at “L” in this set)
“L”: halt mode, “H”: operation mode Not used (fixed at “L” in this set)
74 to 78
NIL
I
Not used (fixed at “L”)
79
TEST
I
Setting terminal for the test mode “L”: test mode (normally fixed at “H”)
80
NIL
I
Not used (fixed at “L”)
Input of FM stereo detection signal from FM/AM tuner unit (TU100), and output of forced
monaural control signal to FM/AM tuner unit (TU100) (Commonly used for stereo display
input and forced monaural output)
FM stereo detection at input of “L”, forced monaural at output of “L”
monaural control signal to FM/AM tuner unit (TU100) (Commonly used for stereo display
input and forced monaural output)
FM stereo detection at input of “L”, forced monaural at output of “L”
23
(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
3-022-475-01 PANEL, SUB
2
X-3370-437-1 LOCK ASSY
3
3-924-404-11 DOOR, CASSETTE
4
3-377-892-01 SPRING (C DOOR), TORSION
* 5
3-022-479-01 BRACKET (MD)
6
3-937-529-01 COVER (FF/REW)
7
3-937-528-01 COVER (EJECT)
8
3-376-464-11 SCREW(+PTT 2.6X6),GROUND POINT
9
3-029-047-01 PLATE (C), GROUND
* 10
X-3375-529-1 COVER ASSY
* 11
3-022-470-01 BRACKET (IC)
* 13
3-022-477-01 HEAT SINK
* 14
A-3326-791-A MAIN BOARD, COMPLETE
* 15
3-022-487-01 SHEET, INSULATING
* 16
3-022-476-01 CHASSIS, MAIN
17
3-338-263-01 CUSHION (U)
* 18
3-022-469-01 SPRING GROUND
19
3-042-244-11 SCREW (T)
F901
1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE) (10A)
TU100
1-693-423-21 FM/AM TUNER UNIT
10
13
14
15
16
18
1
2
5
6
7
8
9
11
#3
#2
#2
#2
#2
#2
F901
Front panel section
#4
#4
MG-36SZ9-32
17
4
3
19
TU100
24
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
(2)
FRONT PANEL SECTION
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
3-022-484-01 BUTTON (RELEASE)
57
3-029-328-01 SPRING (RELEASE)
58
3-022-473-71 PANEL, FRONT
* 59
3-029-527-01 PLATE (LCD), GROUND
* 60
3-029-528-01 ILLUMINATOR
* 61
3-027-172-01 INSULATED PLATE (L)
* 62
3-029-526-01 PLATE, LIGHT GUIDE
63
3-022-474-01 PANEL, FRONT BACK
* 64
3-022-468-01 PLATE, GROUND
* 65
3-022-478-01 PLATE, LIGHT GUIDE
66
3-029-524-01 BLOCK (C), BUTTON
(–. SEL. +. –. SEEKMANU. +. LOUD. TUNER. OFF)
67
3-022-480-01 BLOCK (A), BUTTON
(DSPL. 1. 2. 3. 4. 5. 6. AF/TA)
* 68
3-029-525-01 HOLDER (LCD)
LCD900 1-801-232-11 DISPLAY PANEL, LIQUID CRYSTAL
62
61
60
59
58
57
56
55
54
53
52
51
67
66
65
not supplied
(KEY board)
(KEY board)
64
#5
63
LCD900
68
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