Panasonic LC4.8E AA, Руководство по обслуживанию

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Circuit Descriptions, Abbreviation List, and IC Data Sheets EN 100 LC4.8E AA 9.
• LED. This signal is used as an indication for the Standby,
Remote and Error Indicator. Region diversity:
–
During protection mode, the LED blinks and the set is
in standby mode.
– During error conditions it blinks at a predefined rate.
– After receiving a valid RC-5 or local keyboard
command it flashes once.
– For sets with error message indication, the LED blinks
when message is active and the set is in standby
mode.
• SCL. This is the clock wire of the two-wire single master bi-
directional I
2
C bus.
• SDA. This is the data wire of the two-wire single master bi-
directional I
2
C bus.
• STANDBY. The Hercules generates this signal. This can
enable the power supply in normal operation and disable it
during Standby. It is of logic “high” (3.3 V) under normal
operation and “low” (0 V) during Standby.
• IR. This input pin is connected to an RC5 remote control
receiver.
• SEL-IF. This is an output pin to switch the Video SAW filter
between M system and other systems.
–
0: NTSC M (default)
– 1: PAL B/G, DK, I, L
• NVM_WP. The global protection line is used to enable and
disable write protection to the NVM. When write to the
NVM is required, pin 7 of the NVM must be pulled to logic
‘0’ first (via Write_Protect of the micro-controller pin) before
a write is performed. Otherwise pin 7 of NVM must always
be at logic “1”
–
0: Disabled
– 1: Enabled (default)
• SOUND_ENABLE. This pin is used to MUTE the audio
amplifier. It is configured as push pull.
• STATUS_1. This signal is used to read the status of the
SCART 1 input.
• STATUS_2. This signal is used to read the status of the
SCART 2 input.
• HERC_RESET. This pin is used to switch the +1.8V
supply.
• POWER_DOWN . The power supply generates this signal.
Logic “high” (3.3 V) under normal operation of the TV and
goes “low” (0 V) when the Mains input voltage supply goes
below 70 V
AC
.
• KEYBOARD . Following are the Keyboard functions and
the step values (8 bit) for it.
Table 9-3 Local keyboard values
• TV_IRQ. This signal is the interrupt from the Scaler IC.
• TV_SC_COM. This signal is used for the communication
with the Scaler IC.
• EXT_MUTE. This signal is used to reduce the Switch-off
plop.
9.10 Abbreviation List
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
1080i 1080 visible lines, interlaced
1080p 1080 visible lines, progressive scan
2CS 2 Carrier Sound (or 2 Channel Stereo)
480i 480 visible lines, interlaced
480p 480 visible lines, progressive scan
ACI Automatic Channel Installation:
algorithm that installs TV channels
directly from a cable network by
means of a predefined TXT page
ADC Analogue to Digital Converter
AFC Automatic Frequency Control; Control
signal used to tune and lock to the
correct frequency
AGC Automatic gain control (feedback)
signal to the tuner. This circuit ensures
a constant output amplitude
regardless of the input amplitude
AM Amplitude Modulation; A "data
encoding to a carrier" method, such
that the carrier amplitude is
proportional to the data value
AP or A/P Asia Pacific
AR Aspect Ratio: 4 by 3 or 16 by 9
ASD Automatic Standard Detection
AV External Audio Video
B-SC1-IN Blue SCART1/EXT1 in
B-SC2-IN Blue SCART2/EXT2 in
B-TXT Blue TeleteXT
B/G Monochrome TV system. Sound
carrier distance is 5.5 MHz. B= VHF-
band, G= UHF-band
BOCMA Bimos one Chip Mid-end Architecture:
video and chroma decoder
C-FRONT Chrominance front input
CBA Circuit Board Assembly (also called
PCB or PWB)
CL Constant Level: audio output to
connect with an external amplifier
CLUT Colour Look-Up Table
COLUMBUS COLour LUMinance Baseband
Universal Subsystem. IC performing
noise reduction and 2D/3D comb
filtering
ComPair Computer aided rePair. A tool for
diagnosing a TV through a PC
controlled interface
CSM Customer Service Mode
CVBS Composite Video and Blanking Signal;
A single video signal that contains
luminance, colour, and timing
information
CVBS-EXT CVBS signal from external source
(VCR, VCD, etc.)
CVBS-INT CVBS signal from internal Tuner
CVBS-MON CVBS monitor signal
CVBS-TER-OUT CVBS TERrestrial OUTput signal
DAC Digital to Analogue Converter
DBE Dynamic Bass Enhancement: extra
low frequency amplification
DFU Directions For Use: Owner's manual
DNR Dynamic Noise Reduction / Digital
Noise Reduction; Noise reduction
feature of the set
DRAM Dynamic RAM; dynamically refreshed
RAM
DSP Digital Signal Processing
DST Dealer Service Tool; Special remote
control designed for dealers to enter
Function
Voltage
(V
DC
)
Step values
(8 bit)
NAFTA Standby 0 0 - 6
Ch + 0.43 7 - 33
Exit Factory (Ch- and Vol-) 0.69 34 - 53
Ch - 0.93 54 - 73
Menu (Vol - and Vol +) 1.19 74 - 96
Vol - 1.49 97 - 121
DVD Eject 1.8 122 - 147
Vol + 2.12 148 - 169
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