Product specifications

DA100 (50Hz) Chassis – Article for Television Magazine
Page 77 of 80
Sharp Electronics (UK) Limited - March 2003
Revision 2
IC301 / IC302 - Audio Amplifiers
Type: Thomson TDA7480 Sharp Part Number: VHITDA7480/-1
Package: DIL Price Code: AK
This IC is the same type for all FW models. To date, it has no alternative.
Pin Name I/O Comment DC Voltage
1 -Ve I Negative supply -18.0V
2 -Ve I Negative supply -18.0V
3 -Ve I Negative supply -18.0V
4 Output O PWM output 0V
5 Boot Diode I Boost diode -7.0V
6 Boot I Boost 10.0V
7 NC X Not connected 0V
8 Feedback C I Feedback 0V
9 Frequency C I Freq control -15.0V
10 Ground X Signal ground 0V
11 Input I Signal input 0V
12 Mute I <2.7V mute 5.1V
13 NC X Not connected 0.5V
14 +Ve I Positive supply 17.2V
15 V reg I Reference -7.0V
16 +Ve I Positive supply 17.2V
17 -Ve I Negative supply -18.0V
18 -Ve I Negative supply -18.0V
19 -Ve I Negative supply -18.0V
20 -Ve I Negative supply -18.0V
IC702 - Primary Control
Type: Thomson/SGS ST6203B Sharp Part Number: RH-IX1646BMZZ
Package: SMD gull wing Price Code: AL
This IC is the same type for all FW models. To date, it has no alternative.
Note that the earth connection of the meter has to be taken at the negative end of the main smoothing
block. A more convenient connection is the chopper transistor heatsink.
Pin Name I/O Comment DC Voltage
1 VDD I Supply 5.2V
2 OSCIN I Oscillator 2.5V
3 OSCOUT O Oscillator 2.5V
4 NMI I Remote input 5.0V
5 TEST X Grounded 0V
6 RESET I From reset 5.2V
7 PB7 I From processor 5.2V
8 PB6 I 100Hz reference 0.48V
9 PB5 I/O Key scan 5.2V
10 PB3 I/O Key scan 0V
11 PB1 I/O Key scan 0V
12 PB0 I/O Key scan 0V
13 PA3 O To processor 5.2V
14 PA2 O Degauss 0V
15 PA1 O Power control 0V
16 VSS X Ground 0V