JVC TH-A75 Service Manual page 56

TH-A75
4.35 PC123Y02 (IC102/IC103/IC104/IC122/IC123) : Photocoupler
• Pin layout
1
2
4.36 PQ05RD21 (IC171) : Regulator
• Terminal layout
4.37 S-93C66AFJ-X (IC451) : Serial EEPROM
• Pin layout
NC
Vcc
CS
SK
• Pin function
Pin No. Symbol Function
1 NC Not connect
2 Vcc Power supply
3 CS Chip select input
4 SK Serial clock input
5 DI Serial data input
6 DO Serial data output
7 GND Ground
8 TEST TEST pin:Open
1-56 (No.22009)
Anode mark
4
3
PQ05RD21
Vin GND
Vout Vcontrol
1 8 TEST
2 7 GND
3 6 DO
4 5 DI
Top view
• Block diagram
1
2
• Block diagram
1
Vinput
GND
• Block diagram
Memory array
Data register
DI
Mode decode
logic
CS
Clock generator
SK
circuit
1
Anode
4
2
Cathode
3
Emitter
3
4 Collector
Voutput
2
4 Vcontrol
3
VCC
Address
decoder
GND
Output buffer
DO