Akai 21CTS92FS, Руководство по обслуживанию

Страница: 3 / 19

2
2. The survey
Table 1, the main IC and functions
Number Function IC Remark
1 Power supply KA5Q0765RT N501
2 CPU + SIGNAL PROCESSER TDA93x1 N301
3 Field driver LA78040/STV9302A N401
4 Sound processor TDA9859 N122
5 Sound driver AN17821A N161
6 AV SWITCH TC4052BP N801 (Video)
7 Memory AT24C08 N702
8 Photo-coupler HS817B N504
9 IR-receiver HS0038A U701
10 8V Regulator L7808CV N503
11 5V Regulator L7805CV N505
3. The main chips instruction
1
T
c
T
. TDA93X1
he UOC (“Ultimate One Chip”) TDA93X1
is adopted in this chassis. This IC is the first available component that contains the complete
ontrol and small signal functionality needed for a TV application in one device.
he UOC TDA93X1 pins function description
：（
total 64 pins
）
Pin1: Standby control,
“
1
”
is on,
“
0
”
is off.
Pin2: SCL.
Pin3: SDA.
Pin4: Tuning PWM output.
Pin5: Auto AV control SW/NTSC SW,
Pin6: Key board input.
Pin7: Volume
Pin8: Mute control,
“
1
”
is mute,
“
0
”
is off.
Pin9: Pin12
、
Pin18
、
Pin30
、
Pin35
、
Pin41
、
Pin55: GND.
Pin10: BAND1 control output.
Pin11: BAND2
Pin12: GND
Pin13: SECAM PLL, connected with a capacitance.