Display/Key Control/Bus Control/Power Supply Section - Sony XR-4950X Service Manual

– DISPLAY/KEY CONTROL/BUS CONTROL/POWER SUPPLY SECTION –
Q Q
3 7 6 3 1 5 1 5 0
J561
REMOTE IN
D533
S901 – 904
LSW901 – 904,
906, 907, 909
LSW801
D501
RE901
(VOLUME)
ENCODE –
ROTARY
ENCODER ENCODE +
RE901
BU+B
KEY ON
SWITCH
Q551
T E
L 1 3 9 4 2 2 9 6 5 1 3
1 9
CN901 CN701
(FRONT PANEL SIDE) (MAIN UNIT SIDE)
S552
(NOSE SW)
RESET
BU+B
IC551
S551
(RESET)
XR-C4950X
S501
(FREQUENCY SELECT)
9 kHz
w w w 10kHz
R531
R560
22k
47k
BU+B BU+B BU+B
XR-C4954X
.
09
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MASTER MICRO COMPUTER LIQUID CRYSTAL DISPLAY DRIVER
IC501 (3/3) IC901
DATA-LCD
24 RC-IN1 LCD SO 13 64 DI
CLK-LCD
LCD CKO 14 63 CL
CE-LCD
7 RC-IN0
16 62
LCD CE CE
5 KEYIN0
4 KEYIN1
60
OSC
81 RE-IN0
80 RE-IN1
82
AD-ON
26
KEYACK
BUIN
BUIN 28
78 DOORSW
18 NOSESW
34
TUON
PWON 36
33
RESET
DOOR IND 79
6 DSTSEL
ILL-ON 83
x a o u 1 6 3
ACC IN 38
y
i
16 15 12 13
X502 X501
32.768kHz 18.432MHz
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8
FP+B
LSW901 – 904, 906, 907, 909
LSW912 – 917
LED901 – 904
FP+B
LIQUID CRYSTAL DISPLAY
LCD901
Q Q
3 7 6 3 1
BU+B
NON BUS SWITCH
BATT+B
Q591, 592
FM/AM TUNER UNIT
(AUDIO CIRCUIT B+)
c o
.
19 19
2 4
9 9 8
D581
BUIN
BATTERY CHECK
Q581
D610
D611
5 1 5 0 8 9 2 4 9
6 AMP+B
8 ANT+B POWER AMP
TU8V 11 TU+B (8V)
REGULATOR
IC611 VCC 7
TU5V 10 TU+B (5V)
COM +8V
9 COM8V
BU +B 5 BU+B
D551
3 2 4
LED801 LSW801
DOOR
INDICATOR
SWITCH
Q631
LED910 – 914
(LCD BACK LIGHT)
FP REGULATOR
FP B+
Q601
m
FP REGULATOR
DRIVE
Q602 D572
ACCESSORY
CHECK
Q571
XR-4950X/4954X
2
9 9
BACK UP BATT B+
CN781 (2/2)
(POWER CONNECTOR)
6
ANT REM
5
AMP REM
8 2 9 9
BATT B+
(IC751) B+
18
BATT
7
ACC