Sony HCD-HDX275 Service Manual page 72

HCD-HDX275/HDX277WC/HDX279W/HDX475/HDX576WF/HDX675
IC620 TK11250CMCL-G
6 5
CONTROL
CIRCUIT
CONSTANT
CURRENT
SOURCE
BANDGAP
REFERENCE
1 2
IC103 BU2099FV
20 19 18
12 BIT
CONTROL
SHIFT
CIRCUIT
REGISTER
12 BIT
STORAGE
REGISTER
2 3 4 5
1
– FL Board –
IC100 PT6315
LED1 1
LED2 2
LED3 3
LED4 4
OSC 5 OSC
DOUT 6
DIN 7
SERIAL
INTERFACE
CLK 8
STB 9
KEY1 10
KEY2 11
72
4
OVER HEAT &
OVER CURRENT
PROTECT
3
17 16 15 14 13 12 11
OUTPUT
BUFFER
(OPEN DRAIN)
6 7 8 9 10
44 43
4-BIT LATCH
12-BIT SHIFT
REGISTER
KEY DATA MEMORY
(2 x 16 BITS)
TIMING GENERATOR
KEY SCAN
DISPLAY MEMORY 24-BIT OUTPUT
24 BITS x 12 WORDS LATCH
COMMAND DIMMING
DECODER CIRCUIT
12 13
– JACK-KEY Board –
IC102 S-T111B33MC-OGSTFG
ON/OFF 1
ON/OFF
CIRCUIT
VSS
2
NC
3
– RELAY Board –
IC701, 711 BA6956AN
TSD
1 2 3 4
42 41 38 37 36
40 39
12 4
GRID
DRIVER
8
8
DATA MULTIPLEXED
SELECTOR DRIVER
8
24 16
SEGMENT
DRIVER
14 15 16 17 18 19 20
OVER CURRENT
PROTECTOR
REFERENCE
VOLTAGE CIRCUIT
CONTROL LOGIC
5 6 7 8 9
35 34
4
33 SEG19/GRID10
32 SEG18/GRID11
31 SEG17/GRID12
8
30 VEE
29 SEG16/KS16
28 SEG15/KS15
27 SEG14/KS14
16
26 SEG13/KS13
25 SEG12/KS12
24 SEG11/KS11
23 SEG10/KS10
21 22
5 VIN
4 VOUT