Philips a10, A10E Schematic

ADDITIONAL INFORMATION CHASSIS A 10

LIST OF ABBREVIATIONS

NAME Description

+13V +13V from line deflection
+13V_SCAVEM +13V supply for SCAVEM
+14V +14V from power supply
+15V +15V from power supply for sound amp.
+200V +200V for RGB amp.
+33V +33V tuner voltage
+5V +5V supply from supply
+5V_STBY +5V standby from power supply
+5VA +5V supply for tuner
+5VD +5V standby supply for µP
+5VSOUND +5V for sound processing
+8V +8V from power supply
+8VA +8V for I/O switching
+8VB +8V for BI-MOS
+8VSOUND +8V for sound processing
+L SPK pos. audio output to left speaker
+R SPK pos. audio output to right speaker

-13V -13V from power supply
2CS 2 Carrier Stereo
ACI Automatic Channel Installation: algorithm that installs

TV sets directly from cable network by means of a

predefined TXT page
ADC Analogue Digital Converter
AFC Automatic Frequency Control: control signal used to

tune to the correct frequency
AGC Automatic Gain Control: algorithm that controls the

video input of the featurebox
AM Amplitude Modulation
AMP_MUTE1 signal from µP to mute audio amp.
AR Aspect Ratio: 4 by 3 or 16 by 9
Artistic see Painter 2.5: main processor
AVL Automatic Volume Level
B_TXT_OSD Bleu signal from TXT/OSD
B_Y_IN (B-Y) input of BI-MOS (from TDA9178)
B_Y_OUT (B-Y) output from BI-MOS (to TDA9178)
BASEBAND_AUDIO Baseband audio from BI-MOS or QSS
BG System B and G
BLKIN Black current information
BOCMA Bimos one Chip Mid-end Architecture

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ADDITIONAL INFORMATION CHASSIS A 10

BOCMA High-end video Input Processor: video and chroma

decoder of A10E
B-SC1-IN Blue SCART1 in
B-SC2-IN Blue SCART2 in
B-TXT Blue teletext
C_EXT Chroma signal coming from EXT. source
C_FRNT Chroma signal coming from side AV.
C_REAR Chroma signal coming from rear I/O
C-FRONT Chrominance front input
CL Constant Level: audio output to connect with an

external amplifier
COMB_ON control signal from BI-MOS to switch on/off the comb +

sub carrier
ComPair Computer aided rePair
CRT Cathode Ray Tube or picture tube
CSM Customer Service Mode
CTI Colour Transient Improvement: manipulates steepness

of chroma

transients
CVBS Composite Video Blanking and Synchronisation
CVBS_INT CVBS signal from BI-MOS (tuner)
CVBS_MON CVBS monitor signal form BI-MOS
CVBS_PIP_EXT CVBS signal from EXT. source for PIP
CVBS_PIP_FRNT CVBS signal from side AV. for PIP
CVBS_PIP_INT CVBS signal from tuner for PIP
CVBS_PIP_REAR CVBS signal from rear I/O for PIP
CVBS_TERR CVBS signal from BI-MOS (tuner)
CVBS+SIF_MAIN CVBS + SIF from main for 2 tuner PIP (USA)
CVBS-EXT CVBS signal from external source (VCR, VCD, etc.)
CVBS-INT CVBS signal from Tuner
CVBS-MON CVBS monitor signal
CVBS-TER-OUT CVBS terrestrial out
D1_DAF1 Flyback voltage
D2_P1 Flyback voltage
DAF2_P2 Flyback voltage
DATA in Reserved for MM (combined with STET_EXT1)
DATA out Reserved for MM (combined with SEL_PIP_R1R2 and

STAT_EXT2)
DEGAUSS Signal from µP to control the degaussing
DFU Direction For Use: description for the end user
DNR Digital Noise Reduction: noise reduction feature of the

box
DSP Digital Signal Processing
DST Dealer Service Tool: special remote control designed

for dealers to enter e.g. service mode
DVD Digital Versatile Disc
DYN-PHASE-CORR Dynamic phase correction

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ADDITIONAL INFORMATION CHASSIS A 10

E_W _DRIVE EW signal from BI-MOS to EW panels
EHT Extra High Tension
EHT_INFO Beam current info signal
EHT-INFO Extra High Tension information
EPG Electronic Program Guide: system used by

broadcasters to transmit TV guide information (=

NexTView)
EW East West, related to horizontal deflection of the set
EXT External (source), entering the set via SCART or via

cinches
FBL Fast Blanking: DC signal accompanying RGB signals
FBL_EXT Fastblanking signal from SCART
FBL_OSD Fastblanking from OSD gen
FBL_TXT_OSD Fastblanking signal from TXT/OSD
FBL-SC1-IN Fast blanking signal for SCART1 in
FBL-SC2-IN Fast blanking signal for SCART2 in
FBL-TXT Fast Blanking Teletext
FF Heater voltage
FFBL_EXT Control signal to ident. full screen EXT RGB
FIL Filament supply voltage
FM Field Memory or Frequency Modulation
FRNT_CNTRL AD input signal of µP from front control
FRONT-C Front input chrominance (SVHS)
FRONT-DETECT Front input detection
FRONT-Y_CVBS Front input luminance or CVBS (SVHS)
G_TXT_OSD Green signal from TXT/OSD
GND Ground
GND_LOT Ground from LOT
GNDHOT Live ground
G-SC1-IN Green SCART1 in
G-SC2-IN Green SCART2 in
G-TXT Green teletext
H_DRIVE Horizontal drive pulse from BI-MOS
H_NEG Negative horizontal pulse for PIP, OSD gen. and MM
HA Horizontal Acquisition: horizontal sync pulse coming out

of the BOCMA
HFB Horizontal flyback pulse
HFB Horizontal Flyback Pulse: horizontal sync pulse from

large signal deflection
HP Headphone
IF1 IF signal from tuner to BI-MOS and QSS
Interlaced Scan mode where two fields are used to form one

frame. Each field contains half the number of the total

amount of lines. The fields are written in “pairs”,

causing line flicker.
IO-BUS In/Out - Bus

-L SPK neg. audio output to left speaker

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ADDITIONAL INFORMATION CHASSIS A 10

L_AUDIO_IN Left audio signal from sound processing to power amp.
L_FRNT Left audio signal from side AV.
L_HP_IN Left audio signal from sound processing to headphone

amp.
L_HP_OUT Left audio output signal from headphone amp to

headphone socket
L_INT Left internal audio signal (from tuner)
L_MON Left audio monitor signal
Last Status The settings last chosen by the customer and read and

stored in RAM or in the NVM. They are called at start-

up of the set to configure it according the customers

wishes
LED Signal from µP to control the LED
LED Light Emitting Diode
LINE-DRIVE Line drive signal
LSP Large signal panel
MSP Multistandard Sound Processor: ITT sound decoder of

A10E
MUTE Mute-Line
NC Not Connected
NICAM Near Instantaneously Companded Audio Multiplexing
NVM Non Volatile Memory: IC containing TV related data e.g.

alignments
O/C Open Circuit
ON/OFF LED On/Off control signal for the LED
OSD On Screen Display
P50 Project 50 communication: protocol between TV and

peripherals
Painter On Screen Display, Teletext and Control; also named

Artistic (SAA5565)
PAN_SWITCH Signal from µP to switch on/off the panorama mode
PCB Printed Circuit board
PHASE_CORRECTION Phase correction signal from line deflection
POR Power on reset signal
POR2 Power on reset from µP for EPG or MM
POSNEG_QSS Control signal from µP to switch between pos/neg

modulated signals
PROT_E_W_VERT Protection signal for malfunction of the EW circuit
PROT_IBEAM_EHT_INFO Protection signal for too high beamcurrent
PROT_X_RAY X-ray protection signal
PTP Picture Tube Panel

-R SPK neg. audio output to right speaker
R_AUDIO_IN Right audio signal from sound processing to power

amp.
R_FRNT Right audio signal from side AV.
R_HP_IN Right audio signal from sound processing to headphone

amp.
R_HP_OUT Right audio output signal from headphone amp to

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ADDITIONAL INFORMATION CHASSIS A 10

headphone socket
R_INT Right internal audio signal (from tuner)
R_MON Right audio monitor signal
R_TXT_OSD Red signal from TXT/OSD
R_Y_IN (R-Y) input of BI-MOS from TDA9178
R_Y_OUT (R-Y) output from BI-MOS to TDA9178
RAM Random Access Memory
RC Remote Control
RC5 RC5 signal from IR receiver to µP
RC5 RC5 signal from the remote control receiver
RESET Reset signal
RGB_KILL Control signal from µP to overrule the EXT RGB from

SCART
RGB_SW_OFF Signal from vert deflection to discharge CRT after

switch off
RMT_LOC_DATA Signal from µP to remote locator circuit
ROM Read Only Memory
S/C Short Circuit
S_GND Ground signal for power amp.
SAM Service Alignment Mode
SANDCASTLE Sandcastle signal
SC Sandcastle: pulse derived from sync signals
SC1-OUT SCART output of the MSP audio IC
SC2-B-IN SCART2 Blue in
SC2-C-IN SCART2 chrominance in
SC2-OUT SCART output of the MSP audio IC
SCAVEM Scan Velocity Modulation
SCL I2C Clock
SDA I2C Data
SEL_GAIN_SPLIT Control signal from µP to select the gain of the splitter

(combined with SEL_TUNER1_2)
SEL_IF_TRAP_MAIN Control signal from µP to switch on/off the M trap
SEL_INCRED Control signal from µP to switch on incredible sound
SEL_MAIN_FRNT_RR Control signal from µP to switch between front and rear

external input for main
SEL_MAIN_R1R2 Control signal from µP to switch between rear1 and

rear2 for main (combined with TV clock)
SEL_PIP_FRNT_RR Control signal from µP to switch between front and rear

external input for PIP
SEL_PIP_R1R2 Control signal from µP to switch between rear1 and

rear2 for PIP (combined with STAT2 and DATA out)
SEL_TUNER1_2 Control signal from µP to select between tuner1 and

tuner2 (combined with sel_GAIN_SPLIT)
SIF Sound Intermediate Frequency
SIMM 80-fold connector between LSP and SSB
SNDL-SC1-IN Sound left SCART1 in
SNDL-SC1-OUT Sound left SCART1 out

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ADDITIONAL INFORMATION CHASSIS A 10

SNDL-SC2-IN Sound left SCART2 in
SNDL-SC2-OUT Sound left SCART2 out
SNDR-SC1-IN Sound right SCART1 in
SNDR-SC1-OUT Sound right SCART1 out
SNDR-SC2-IN Sound right SCART2 out
SNDR-SC2-OUT Sound right SCART2 out
SNDS-VL-OUT Surround sound left variable level out
SNDS-VR-OUT Surround sound right variable level out
SNERT Synchronous No parity Eight bit Reception and

Transmit
SOUND_IF CVBS signal with sound IF
SSB Small Signal Board
STAT_EXT1 Status signal from SCART 1 (pin 8) (combine with

DATA in)
STAT_EXT2 Status signal from SCART 2 (pin 8) (combined with

SEL_R1R2_PIP and DATA out)
STAT_HP Status signal from HP socket to µP
STBY Control signal from µP to switch set to standby
STBY Standby
SVHS_MODE Control signal from µP to switch between SVHS source

and no SVHS source
SW Subwoofer
SW_AUDIO_IN Audio signal from sound processing to subwoofer panel
SYS1 Control signal from µP to selected the colour system for

comb-filter and X-tals
SYS2 Control signal from µP to selected the colour system for

comb-filter and X-tals
TV clk Reserved for MM (combined with SEL_MAIN_R1R1)
TXT Teletext
V Vertical pulse
V_DRIVE_NEG Drive pulse for vertical deflection
V_DRIVE_POS Drive pulse for vertical deflection
V_NEG Negative vertical pulses
VA Vertical Acquisition
VBAT Battery voltage for the LOT
V-BAT main supply for deflection (mostly 141 V)
VFB Vertical Flyback Pulse: vertical sync pulse coming from

the feature box
VL Variable Level out: processed audio output towards

external amplifier
WYSIWYR What You See Is What You Record: record selection

that follows main picture and sound
XTAL Quartz crystal
Y_CVBS_EXT Y or CVBS signal from external source
Y_CVBS_FRNT Y or CVBS signal from front/side AV.
Y_CVBS_MON Y or CVBS signal from BI-MOS
Y_CVBS_REAR Y or CVBS signal from rear I/O

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ADDITIONAL INFORMATION CHASSIS A 10

Y_IN Y input signal of BI-MOS (from TDA9178)
Y_OUT Y output signal of BI-MOS (to TDA9178)
Y-OUT Luminance-signal
µP microprocessor

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