Sony XR-4950X Service Manual ▷ View online
XR-4950X
22
22
6-7.
PRINTED WIRING BOARD – KEY Board –
R930
R939
1
52
LSW912 – 917
A2
S1
A1
S1
A1
K2
S2
K1
S2
K1
A2
S1
A1
S1
A1
K2
S2
K1
S2
K1
A2
S1
A1
S1
A1
K2
S2
K1
S2
K1
A2
S1
A1
S1
A1
K2
S2
K1
S2
K1
A2
S1
A1
S1
A1
K2
S2
K1
S2
K1
A2
S1
A1
S1
A1
K2
S2
K1
S2
K1
A2
A
S1
A1
A1
K2
S2
K1
S2
K1
B
C
D
E
F
G
H
1
2
3
4
5
6
7
8
9
10
11
12
13
A
A1
S1
A2
K1
S2
K2
LED901 – 904
A
K
K
A
K
K
A
K
A
LED901
A-2
LED902
C-2
LED903
C-4
LED904
A-4
LED910
C-13
LED911
B-13
LED912
B-5
LED913
C-5
Ref. No.
Location
Ref. No.
Location
D901
H-11
D902
G-10
D903
G-10
D904
G-10
D952
G-6
IC901
G-8
• Semiconductor Location
(Page 20)
XR-4950X
23
23
6-8.
SCHEMATIC DIAGRAM – KEY Board –
•
See page 15 for Waveform.
(Page
20)
XR-4950X
24
24
6-9.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501 MN101C49KTA2 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
VREF
I
Reference voltage (0V) input terminal (for A/D converter)
2
VSM
I
FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU1)
(A/D input)
(A/D input)
3
FMAGC
I
FM AGC level detection signal input from the FM/AM tuner unit (TU1) (A/D input)
4
KEYIN1
I
Key input terminal (A/D input) (LSW801, LSW909, LSW912 to LSW917)
Z, D-BASS, 6, 5, 4, 3, 2, REP 1
Z, D-BASS, 6, 5, 4, 3, 2, REP 1
keys input
5
KEYIN0
I
Key input terminal (A/D input) (LSW901 to LSW907, S901 to S904)
OFF, SOURCE, SOUND, MENU, MODE o, ENTER, SEEK/AMS – . m,PRST +,
SEEK/AMS + > M, PRST – keys input
OFF, SOURCE, SOUND, MENU, MODE o, ENTER, SEEK/AMS – . m,PRST +,
SEEK/AMS + > M, PRST – keys input
6
DSTSEL
I
Destination setting terminal (fixed at “H” in this set)
7
RCIN0
I
Rotary remote commander key input terminal (A/D input)
8
QUALITY
I
Noise level detection signal input at SEEK mode (A/D input) Not used (open)
9
—
O
Not used (open)
10
VREF
I
Reference voltage (+5V) input terminal (for A/D converter)
11
VDD
—
Power supply terminal (+5V) (for A/D converter)
12
OSCOUT
O
Main system clock output terminal (18.432 MHz)
13
OSCIN
I
Main system clock input terminal (18.432 MHz)
14
VSS
—
Ground terminal (for A/D converter)
15
XIN
I
Sub system clock input terminal (32.768 kHz)
16
XOUT
O
Sub system clock output terminal (32.768 kHz)
17
MMOD
I
Not used (fixed at “L”)
18
NOSESW
I
Front panel block remove/attach detection signal input
“L”: front panel is attached, “H”: front panel is removed
“L”: front panel is attached, “H”: front panel is removed
19
BUSON
O
Bus on/off control signal output terminal “L”: bus on Not used (fixed at “H”)
20
SYSRST
O
Reset signal output terminal “L”: reset Not used (fixed at “H”)
21
LCDSO
O
Serial data output to the liquid crystal display driver (IC901)
22
LCDCE
O
Chip enable signal output to the liquid crystal display driver (IC901) “H” active
23
LCDCKO
O
Serial data transfer clock signal output to the liquid crystal display driver (IC901)
24
RCIN1
I
Rotary remote commander shift key input terminal “L”: shift
25
RAMBU
I
Internal RAM reset detection signal input terminal
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 50 msec after reset Not used (fixed at “L”)
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 50 msec after reset Not used (fixed at “L”)
26
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”
27
—
O
Not used (open)
28
BUIN
I
Battery detect signal input from the battery detect circuit “L” is input at low voltage
29
SIRCS
I
Sircs remote control signal input terminal Not used (fixed at “L”)
30, 31
—
O
Not used (open)
32
MTLIN
I
Auto metal detection signal input terminal “H”: auto metal Not used (fixed at “L”)
33
RESET
I
System reset signal input from the reset signal generator (IC551) and reset switch (S551)
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
“L”: reset “L” is input for several 100 msec after power on, then it changes to “H”
34
TUNON
O
Tuner system power supply on/off control signal output to the BA4908 (IC611)
“H”: tuner power on
“H”: tuner power on
35
BEEP
O
Beep sound drive signal output to the power amplifier (IC751)
36
PW ON
O
Main system power supply on/off control signal output to the BA4908 (IC611)
“H”: power on
“H”: power on
37
COLSEL
I
Setting terminal for the illumination color “L”: amber, “H”: green Fixed at “L” in this set
Pin No.
Pin Name
I/O
Description
38
ACC IN
I
Accessory detection signal input “L”: accessory on
39
TESTIN
I
Setting terminal for the test mode “H”: test mode, Normally: fixed at “L”
40
TELATT
I
Telephone muting signal input terminal At input of “H”, the signal is attenuated by –20 dB
41
UNICLI
I
Serial data transfer clock signal input terminal Not used (fixed at “L”)
42
UNISO
O
Serial data output terminal Not used (fixed at “L”)
43
UNISI
I
Serial data input terminal Not used (fixed at “L”)
44
UNICKO
O
Serial data transfer clock signal output terminal Not used (fixed at “L”)
45
I2C SIO
I/O
Two-way data bus with the electrical volume (IC331) and FM/AM tuner unit (TU1)
46
VOLATT
O
Muting on/off control signal output to the electrical volume (IC331) “L”: muting on
47
I2C CKO
O
Clock signal output to the electrical volume (IC331) and FM/AM tuner unit (TU1)
48
AMPON
O
Standby on/off control signal output to the power amplifier (IC751)
“L”: standby mode, “H”: amplifier on
“L”: standby mode, “H”: amplifier on
49
AMPATT
O
Muting on/off control signal output to the power amplifier (IC751) “L”: muting on
50
ATT
O
Audio line muting on/off control signal output “H”: muting on
51
TU ATT
O
Muting on/off control signal output of the FM and AM tuner signal “H”: muting on
Not used (open)
Not used (open)
52
AMSON
O
Tape auto music sensor control signal output to the CXA2509AQ (IC301)
“L” is output to lower the gain for audio level at FF/REW mode
“L” is output to lower the gain for audio level at FF/REW mode
53
NROUT
O
Forward/reverse direction control signal output to the CXA2509AQ (IC301)
“L”: forward direction, “H”: reverse direction
“L”: forward direction, “H”: reverse direction
54
MTLON
I/O
METAL control in/out terminal
At initial mode: auto/manual mode selection input of METAL function (manual at “L” input)
At manual mode: METAL on/off control signal output terminal (METAL on at “H” output)
At auto mode: input at MTLIN (pin es)
At initial mode: auto/manual mode selection input of METAL function (manual at “L” input)
At manual mode: METAL on/off control signal output terminal (METAL on at “H” output)
At auto mode: input at MTLIN (pin es)
55
TAPATT
O
Tape muting on/off control signal output to the CXA2509AQ (IC301) “H”: muting on
Active at ATA, FF/REW mode
Active at ATA, FF/REW mode
56
DOLON
I/O
Dolby control in/out terminal
At initial mode: valid/invalid selection input of dolby function (valid at “L” input)
At normal mode: dolby on/off control signal output terminal (dolby on at “H” output)
Not used this function (fixed at “H”)
At initial mode: valid/invalid selection input of dolby function (valid at “L” input)
At normal mode: dolby on/off control signal output terminal (dolby on at “H” output)
Not used this function (fixed at “H”)
57
AMSIN
I
Whether a music is present or not from CXA2509AQ (IC301) is detected at auto music sensor
“L”: music is present, “H”: music is not present
“L”: music is present, “H”: music is not present
58
4VPRE
I
4VPREOUT model setting terminal “L”: 4VPREOUT model Fixed at “H” in this set
59 to 73
—
O
Not used (open)
74
E2P SIO
I/O
Two-way data bus with the FM/AM tuner unit (TU1)
75
E2P CKO
O
Clock signal output to the FM/AM tuner unit (TU1)
76
—
O
Not used (open)
77
SWSHIFT
O
AM filter control signal output to the FM/AM tuner unit (TU1) “L”: SW mode
78
DOORSW
I
Front panel open/close detection signal input “L” is input when the front panel is closed
79
DOORIND
O
LED drive signal output of the tape window and Z indicator (LED801, LSW801)
“H”: LED on “H” is output to turn on LED when front panel is opened
“H”: LED on “H” is output to turn on LED when front panel is opened
80
REIN1
I
81
REIN0
I
82
AD ON
O
A/D converter power control signal output
When the KEYACK (pin wh) that controls reference voltage power for key A/D conversion input
is active, “L” is output from this terminal to enable the input
When the KEYACK (pin wh) that controls reference voltage power for key A/D conversion input
is active, “L” is output from this terminal to enable the input
83
ILLON
O
Power on/off control signal output of the illumination LED and liquid crystal display driver
(IC901) “H”: power on
(IC901) “H”: power on
Dial pulse input of the rotary encoder (RE901) (for volume control)
25
XR-4950X
Pin No.
Pin Name
I/O
Description
84
REL
I
Rotation detection signal input from supply reel sensor and take-up reel sensor on the deck
mechanism
mechanism
85
POS3
I
86
POS2
I
87
POS0
I
88
POS1
I
89
LMLOD
O
Motor drive signal output to the loading/tape operation motor driver (IC351) “H” active
(For the loading direction and forward side operation) *1
(For the loading direction and forward side operation) *1
90
LMEJ
O
Motor drive signal output to the loading/tape operation motor driver (IC351) “H” active
(For the eject direction and reverse side operation) *1
(For the eject direction and reverse side operation) *1
91
TAPON
O
Tape system power supply on/off control signal output “H”: tape on
92
CMON
O
Capstan/reel motor (M901) drive signal output “H”: motor on
93, 94
—
O
Not used (open)
95
DAVSS
—
Ground terminal (for D/A converter) Not used (open)
96
NS MASK
O
Discharge control signal output terminal “H”: discharge Not used (open)
97 to 99
—
O
Not used (open)
100
DAVDD
—
Power supply terminal (+5V) (for D/A converter) Not used (open)
Tape position (EJECT/FF/REW/
REV/FWD mode) detection signal
input from the tape operation switch
on the deck mechanism
REV/FWD mode) detection signal
input from the tape operation switch
on the deck mechanism
POS0: “L”: EJECT mode, “H”: others mode
POS1: “L”: FF and FWD mode, “H”: others mode
POS2: “L”: REW mode, “H”: others mode
POS3: “L”: REV and EJECT mode, “H”: others mode
POS1: “L”: FF and FWD mode, “H”: others mode
POS2: “L”: REW mode, “H”: others mode
POS3: “L”: REV and EJECT mode, “H”: others mode
*1 Loading/tape operation motor control
STOP
LOADING/
FORWARD
EJECT/
REVERSE
BRAKE
LMLOD (pin il)
“L”
“H”
“L”
“H”
LMEJ (pin o;)
“L”
“L”
“H”
“H”
Mode
Terminal
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