Philips L9.2EAA, Руководство по обслуживанию

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Circuit description new circuits
GB 53 L9.2E 9.
FM/AM/
Ext_VC_AudioMono
FM, AM or external mono signal from
BiMOS to audio processor input (only
used in Mono and Nicam L sets)
Front/Ext1AudioL Front audio Left input signal / External
1 Audio Left input signal.
Front/Ext1AudioR Front audio Right input signal /
External 1 Audio Right input signal.
GND Ground
GND_LOT Ground of LOT
G_TXT_OSD Green TXT or OSD signal from micro
processor to the video controller
IC7250 (BIMOS)
HD Horizontal pulse derivation
HDRIVE Horizontal output drive
HEW_protn Switching signal to (de)activate the
XRAY protection which is measured
via pin 50 of the BIMOS (only for USA
sets)
Hflybk Horizontal flyback pulse used to
monitor the horizontal oscillator
IF Intermediate Frequency signal from
the tuner
12C (or IIC) 2 Wire communication protocol
between micro controller and
integrated circuits
IC Integrated Circuit
I/O Input/Output
INT Audio internal output
IR Output signal from infrared receiver to
micro controller.
KeyBd1 Local keyboard control signal to micro
controller
KeyBd2 Local keyboard control signal to micro
controller (In protection mode KeyBd2
is Ground)
KeyBd3 Local keyboard control signal to micro
controller
L- Power amplifier output to headphone
and speaker
L+ Power amplifier output to speaker
LED LED control signal from micro
controller to LED
LATAM Latin America; schematic/PCB
information (only) applicable for Latin
American (incl. Brazilian) sets
LeftOut Audio Left signal output
LTI Luminance Transient Improvement (=
steepness)
MainAudioL/Mono Audio Left/Mono signal to input power
amplifier
MainAudioR Audio Right signal to input power
amplifier
MON Audio monitor output
NICAM Near Instantaneous Companded
Audio Muliplex (digital audio)
NR Noise Reduction
NTSC NTSC colour system
OSD On Screen Display
P0Sys1/AM Switching signal with several
functions:
BiMOS crystal
selection (only for
Latam sets)
Selection of AM or FM signal (used in
combination with P1Sys2/
AMFM_ExtSel) (only for Europe)
P1Sys2/
AMFM_ExtSel
Switching signal with several
functions: BIMOS crystal selection
(only for Latam sets) Selection of
internal AM/FM signal or an external
signal (used in combination with
P0Sys1/AM)
P2LLp/Mtrap Switching signal with several
functions: M-trap (sound filtering)
switching (only for A/P Pal Multi sets)
BiMOS crystal selection (only for
Latam sets), Selection of L or L'
system (only for Europe sets)
P3Dual/Mono Switching signal to select the sound
filter in dual-system Mono sets (BG/I,
BG/DK or I/DK).
P4ScartPin8/SVHS Switching signal from I/O to micro
controller with several functions:
Scart1 I/O: detects signal type
connected to Scart 1 (no signal, 16:9
signal, 4:3 signal) (only for Europe)
Cinch I/O: detects signal type
connected to cinch: SVHS or CVBS
(not for Europe)
P5BassSw Bass switching signal (only for some
mono sets)
P6TrebleSw Treble switching signal (only for some
mono sets)
P7Ext1/2 Used in L9-ITV sets (Hotel TV)
Pprotn Signal from E-W and LOT output to
micro controller to (de)activate the
protection mode
P10Mute/Volume Audio mute / Volume control signal pin
POR/CLK Power on reset (only used in L9-ITV
sets)
R- Power amplifier output " R- " to
speaker
R+ Power amplifier output " R+ " to
headphone and speaker
RAM Random Access Memory
RESET Reset signal to micro controller
RF_AGC Automatic gain control signal from
BiMOS output to tuner input.
RGB Red-Green-Blue
RGB_Blanking Red Green Blue Blanking signal
(combined with AV_MUTE)
RightOut Audio right signal output
R_TXT_OSD Red TXT or OSD signal from uC to the
video controller IC7250 (BIMOS)
ROM Read Only Memory
SAM Service Alignment Mode. Service
mode for alignments and error buffer
display
SAP Second audio program (only for USA
& A/P sets)
SCL Clock line of the I2C-bus
SCL2 2nd Clock line of the IIC-bus (only
used in L9-ITV sets)
SDA Data line of the I2C-bus
SDA2 2nd Data line of the I2C-bus (only
used in L9-ITV sets)
SDM Service Default Mode. Service mode
with predefined settings for waveform
and voltage measurements, error
buffer display and option (byte)
setting.
SIF Sound IF signal for FM audio
demodulator
SMPS Switching Mode Power Supply
STANDBY Switching signal from micro controller;
"low" for standby (power supply will be
switched to stand-by mode), "high" for
normal operation
SW_OUT Selected Output signal from source
SYNC Synchronisation
TBD To Be Defined
TREBLE Control signal for treble
TXT Teletext
µ
C Micro controller