Philips L7.3A, Service Manual

Page: 46 / 48

11 Abbreviations
46 L7.3A
11 Abbreviations (R-Y)_OUT R-Y output from chroma demodulator
uC Microcomputer
AQUA Aquadaq layer on the outside of the picture
tube
AV_MUTE Signal to mute the sound on the Audio-out
cinch
AVL_AV2/AVL Switching signal from UP to the Auto Volume
leveller on the ITT on BTSC Panel or Rear
Cinch I/P 2 width CVBS. R and Sound
B_TXT_OSD Blue TXT or OSD signal from (C to the video
controller IC7225-5C
BASS Control signal for BASS
BCI Beam Current information
BG/1_or_BG/0 K Monochrome TV system sound c 5.5
MHz (BG), Sound c 6 MHz(I), Sound
c 6.5 MHz (DK)
BL_TXT_OSD Fast blanking signal to IC7725-5C to display
OSD and TXT
BLACKSTR_SW Black stretch switch
BS1 TV band selection 1 signal
BS2 TV band selection 2 signal
CHROMA_O/
NTSC_SW
Switch on signal for NTSC chroma oscillator
(3.575 MHz)
CHROMA_1/BG/L Switch on signal for BG/L chroma oscillator
(3.582 MHz)
CHROMA_1/
STATUS
Switch on signal for NTSC chroma oscillator
(3.579 MHz)
CHROMA_2/
STATUS
Signal to select the correct system in case of
trinorma
CVBS_EXT1 CVBS external 1 input signal
CVBS_EXT2 CVBS external 2 signal
CVBS_IN CVBS internal 1 (from tuner)
CVBS_OUT CVBS output signal
CVBS_OUT_1 CVBS output signal 1
CVBS_SOUND CVBS for inter carrier sound detector
CVBS_TXT CVBS for TXT processing in uC
DISCHARGE To have a fast discharge after switching off
the set
EAR Earth
EEPROM Electrical Erasable Programmable Read Only
Memory
ESD Electrical Static Discharge
ff Filament (heater voltage) from LOT to the
picture tube
FL_A Filament voltage for CRT
G_TXT_OSD Green TXT or OSD signal from the uC to
IC7225-5C
GND Ground
GRD_LOT Ground of LOT
HOR.FLYBACK Horizontal flyback pulse used for looking the
horizontal oscillator
12C Digital Control bus of the microcomputer
IF Intermediate frequency signal for sound
processing
INT/EXT Switching signal for Internal or external audio +
video switching
L_EXT1 Audio left external 1
LEFT_OUT Audio left out
MOD_L_1N1 SCART I/P 1 in left
MOD_L_1N2 SCART I/P 2 in left
MOD_R_1N1 SCART I/P 1 in righ
MOD_L_1N2 SCART I/P 2 in left
MONO/STROBE/
BG_L
Strobe signal for HEF 4094 on multi-mono
sound panel
MONO_OUT Audio mono out
NTSC NTSC colour system
PAL/SECAM PAL or SECAM colour system
R_TXT_OSD Blue TXT or OSD signal from the uC to the
video controller IC7225 5C
RAM Random Access Memory
RESET1 Reset signal for the uC
RF_AGC Automatic gain control signal I for tuner
RIGHT_OUT Audio right ou
ROM Read Only Memory
SAM Service Alignment Mode
SANDCASTLE Sand castle signal from IC7225-5D to delay
line IC7255 and SECAM chrominance
decoder IC7241.
SCL Clock line of the 12C-bus
SDA Data line of the 12C-bus
SDM Service Default Mode; predefined mode for
faultfinding
SECAM_REF SECAM reference
SID/STA/LL Sound identification / stereo available / france
system "L"
SIF Sound IF signal for FM demodulator
STANDBY Switching signal from uC "low" for standby
(power supply will be switched to stand-by
mode), "high" for normal operation
TREBLE Treble control signal
V_TUNE Tuning voltage for tuner
VFB Vertical flyback pulse
VFL 50Hz vertical flyback pulse used to inform the
uC that flyback takes place. This is important
for OSD and TXT
VG2 Voltage on grid 2 of the picture tube
VOLUME Control signal (from uC, but on DC level via RC
nework) for volume control of sound
processing in sound panel