Philips DVD-620 Service Manual page 56

EN 56 9. DVD 620 /0X1
The slave processor has an internal square signal generator
(42 kHz), to generate the AC filament voltage. TS7330 and
7331 amplify the square signal before it is applied to the display
(VAC= VFIL_1 - VFIL_2, VRMS≈ 2.4V). The necessary power
supply of -18V is derived (via zener diode 6311) from the -24V
of voltage regulator 7310.
9.5 User Interface
The user interface consists of two different panels with only
some tact-switches mounted on them. When one of these
switches is pressed, the signal at the scanning pins (slave uP
pins 9 to 12) goes from +5 V to 0 V.
9.6 Abbreviation list
ADC
AM
AV
BE
ComPair
CD-DA
CS
CVBS
DAC
DFU
DNR
DRAM
DSD
DSP
DTS
DVD
EMI
EXT
FFC
FLASH
FM
FTD
HP
HPF
HW
I2C
I2S
IC
IF
IR
IRQ
LED
LPCM
LPF
LRCLK
LVTTL
MPEG
NC
NTSC
NVM
OC
OSD
P50
PAL
Circuit Descriptions, List of Abbreviations, and IC Data
Analogue to Digital Converter
Amplitude Modulation
External Audio Video
Basic Engine
Computer aided rePair
CD Digital Audio
Chip Select
Composite Video Blanking and
Synchronisation
Digital to Analogue Converter
Direction For Use: description for the
end user
Dynamic Noise Reduction
Dynamic RAM
Direct Stream Digital
Digital Signal Processing
Digital Theatre Sound
Digital Versatile Disc
External Memory Interface (STi55xx)
External (source), entering the set via
SCART or Cinch
Flat Foil Cable
Flash memory
Frequency Modulation
Fluorescent Tube Display
Headphone
High Pass Filter
Hardware
Integrated IC bus
Integrated IC Sound bus
Integrated Circuit
Intermediate Frequency
Infra Red
Interrupt Request
Light Emitting Diode
Linear Pulse Code Modulation
Low Pass Filter
Left/Right clock
Low Voltage Transistor Transistor
Logic (3.3V logic)
Motion Pictures Experts Group
Not Connected
National Television Standard
Committee. Colour system mainly
used in North America and Japan.
Colour carrier NTSC M/N = 3.579545
MHz, NTSC 4.43 = 4.433619 MHz
(this is a VCR norm, it is not
transmitted off-air)
Non Volatile Memory: IC containing
TV related data e.g. alignments
Open Circuit
On Screen Display
Project 50 or Easy Link
Phase Alternating Line. Colour system
mainly used in West Europe (colour
carrier = 4.433619 MHz) and South
America (colour carrier PAL M =
3.575612 MHz and PAL N = 3.582056
MHz)
PCB Printed Circuit Board (see PWB)
PCM Pulse Code Modulation
PCM_CLK Audio system clock for DAC
PCM_OUTx Audio serial output data
PSU Power Supply Unit
PWB Printed Wiring Board (see PCB)
RAM Random Access Memory
RC Remote Control handset
RC5/6 Remote Control system 5/6, signal
from/to the remote control receiver
RGB Red, Green and Blue colour space
ROM Read Only Memory
SCART Syndicat des Constructeurs
d'Appareils Radiorecepteurs et
Televisieurs
SCL Serial Clock I2C
SCLK Audio serial bit clock
SDA Serial Data I2C
SDRAM Synchronous DRAM
S/PDIF Sony Philips Digital InterFace
SRAM Static RAM
STBY Standby
SVCD Super Video CD
SVHS Super Video Home System
SW Software
THD Total Harmonic Distortion
TTL Transistor Transistor Logic (5V logic)
TXT Teletext
uP Microprocessor
VCD Video CD
Y/C Luminance (Y) and Chrominance (C)
signal
YUV Component video
0/6/12 SCART switch control signal on A/V
board. 0 = loop through (AUX to TV), 6
= play 16:9 format, 12 = play 4:3
format