Panasonic VL-SWD272BX Service Manual page 13

4.2.1.2. Main Board
4.2.1.2.1. Power Supply Part
Power control IC (IC1)
Input voltage: AC 220V~240V
Output voltage: DC 23V, DC 12V
Package: 8pin DIP
Outline of Operation: It generate from AC 220V~240V to DC 23V, DC 12V.
4.2.1.2.2. External Interface Part
Regulator for Power 5V (IC910)
Input voltage: +12V
Output voltage: +5V
Package: 8pin SOP-8
Outline of Operation: It generate from +12V to +5V.
Regulator for BBIC & SP AMP 4V (IC930)
Input voltage: +12V
Output voltage: +4V
Package: 8pin SOP-8
Outline of Operation: It generate from +12V to +4V.
Regulator for 3.3V (IC920)
Input voltage: +12V
Output voltage: +3.3V
Package: 8pin SOP-8
Outline of Operation: It generate from +12V to +3.3V.
FM Demodulation (IC670)
Operating Power Supply : +5V
Package: 24pin SOP
Outline of Operation: The video signal (FM) from the Door
Station is demodulated.
4.2.1.2.3. Audio Part
Sub CPU (IC405)
Operating Power Supply : +3.3V
Operating Power Supply : +4V (SP AMP)
Operating Power Supply : +3.2V (RF)
Operating Power Supply : +1.8V (Core)
Package: 206pin
Package Size: 15 x 15 mm
Outline of Operation: Baseband signal processing/Sound
signal processing/Part of RF and voice control.
System clock frequency: 10.368MHz (X401)
VL-SWD272BX/SWD272CX/SWD272CX1/SWD272AZ/VL-WD613CX/VL-WD613CX1
Regulator for 5V (IC671)
Input voltage: +12V
Output voltage: +5V
Package: 5pin SOT-25A.
Outline of Operation: It generate from +12V to +5V (FM
Demodulation).
OP AMP for Door station (IC500)
Operating Power Supply : +12V
Package: 8pin SSOP-8
Outline of Operation: The sound signal (send & receive) are
converted to 2 line from 4 line.
PBX OFF-HOOK detection photo coupler (IC800)
Operating Power Supply : +3.3V
Package: 4pin
Outline of Operation: The off hook signal is detected.
OP AMP for PBX 2/4 conversion (IC801)
Operating Power Supply : +12V
Package: 8pin SSOP-8
Outline of Operation: The sound signal (send & receive) are
converted to 2line from 4line.
8M FROM (IC402)
Operating Power Supply : +1.8V
Package: 8pin SOIC
Memory capacity: 8Mbit
Outline of Operation: Storing the program of IC405.
EEPROM(IC401)
Operating Power Supply : +3.3V
Package: SOP-J8
Memory capacity: 64kbit
Outline of Operation: Storing the parameter of IC405.
1MSRAM (IC404)
Operating Power Supply : +1.8V
Package: 48-ball VFBGA
Memory capacity: 1Mbit
Outline of Operation: Work area of IC405.
13