Matsui 1410R, Service Manual

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13
List of abbreviations
µC Microcomputer
µP INT/EXT Switching signal from µC to TS7876 and TS7877 (diagram C) making together with pin 8 of SCART connector the INT/EXT switching signal; "low" for
internal, "high" for external
AF Alternating Current
AFC Automatic Frecuency Control
AGC Automatic Gain Control
AM Amplitude modulation
AQUA Aquadag on the CRT panel for spark gaps and used for making BCI signal
AV Audio and Video cinches on the rear side of the set
BCI Beam Current Info; if beam current increases the BCI signal decrases. BCI is used for contrast reduction if beam current is too high
BCI' Derived from BCI; if beam current increases (more white), EHT decreases so picture will become too big. BCI and so BCI' dec reases for increasing
beam current (diagram C) and the picture will be corrected.
BG/I Switching signal from µC; "low" for I or DK reception (6.0 or 6.5 MHZ FM sound), "high" for BG reception (5.5 MHZ FM sound)
BG/I/DK/LL' Sond system BG/I/DK/LL' indicate frecuency distance between sound and picture carriers (5.5 MHz for I, 6.5 MHz for D K and LL')
BG/L Switching signal from µC; "low" for BGIDK reception (negative modulation, FM sound), "high" for LL' reception (positive modulation, AM sound)
BRI Brightness control signal (same as BRIGHTNESS)
BRIGHTNESS Control signal (from µC, but on DC level via RC network) for brightness control of the video controller IC7015/6D
BSW1 Bandswitcing signal from µC to 2 to 3 decorer IC 7002
BSW2 Bandswitching signal from µC to 2 to 3 decorer IC7002
CONTRAST Control signal (from µC, but on DC level via RC network) for brightness control of the video controller IC7015/6D
CRT Picture tube
CVS Colour Video Blanking Synchronisation from pin 7 IF detector IC7015/6A
DC Direct current
EEPROM Electrical Eresable Programmable Read Only Memory
EHT Extra High Tension (25 KV)
FET Field Effect Transistor
FF Filatement (heather voltage)
FM Frecuency MOdulation
HOR FLYBACK Horizontal flyback pulse (15625 Hz) used for locking the horizontal oscillator in IC7015/6E and for locking the OSD generator in the µC
HOR Horizontal drive signal from IC7015/6E to line output stage
HUE Tint ajustment for NTSC system
I 2 C Digital Control bus of the microcomputer
IDENT Status signal; "low" for horizontal synchronisation, "high" in case horizantal synchronisation is detected
IF Intermediate Frecuency
iNT/EXT Switching signal derived fromµµP INT/EXT and pin 8 of SCART to pin 16 IC7015/6B and IC7140 (diagram D); "low" for internal, "high" for external
L/L' Switching signal from µC; "low" for BGIDKL (picture at 38.9 MHz) reception, "high" for L' reception (picture at 33.4 MHz)
LED Light Emitting Diode
LOT Line Output Transformer
MUTE PROG 0 Only for sets whithout SCART + AV ; "low" for program 0 muting the sound, "high" for program 1-39
NIL Non InterLace
NTSC National Television System Committee
OSD On Screen Display
OSD FAST BLANKING Fast blanking info from OSD generator in µC to video controller IC7015/6D for blanking the RGB info to enable OSD-G insertion
OSD-G
Green info from OSD generator in µC to video controller IC7015 for inserting green OSD info on screen.
PAL Phase Alternating Lines
PLL Phase Locked Loop
POR Power On Reset (ensures the µC starts up it's software only if the power supply of the µC itself is high enough)
POS/NEG Switching signal from IC7140 via BG/L; "high" for positive modulation (LL'), highihmic for negative modulation (BGIDK).
PP Personal Preference
PROT Prottection signal from frame IC7400; in case vertical flyback generator in IC7400 is not activted, the voltage at pin 8 IC7400 becomes 2V.
Protection circuit in IC7400 will make pin 7 "high" overrulling the HOR FLYBACK and SANDCASTLE. The constant "high" sandcastle is supplied to
the luminance circuit and so the picture will be blanked.
PTC Positive Temperature Coefficient Resistor
RC5 Remote Control 5 system
RGB Red Green Blue
ROM Random Access Memory
SATURATION Control signal (from µC, but on DC level via RC network) for saturation control of the video controller IC7015/6D
SAW Surface Acoustic Wave; very precise bandpass filter.
SC Sandcastle signal from IC7015/6F to delay line IC7271 and SECAM chroma decoder IC7250
SCART CVBS IN CVBS signal from pin 2 SCART to external input pin 15 IC7015/6B
SCART CVBS OUT CVBS signal from IF detector IC 7015/6A to pin 19 SCART
SCART AUDIO IN Audio signal from SCART + AV cinches to source select IC7140
SCART AUDIO OUT Audio signal from IC 7140 to pin 1 and 3 SCART + AV
SCART Euroconnector
SCL Clock line of the I²C-bus
SDA Data line of the I²C-bus
SDM Service Default Mode; predefined mode for faultfinding (see chapter 8)
SECAM SEquential Couleur A Memoire
SMPS Switched Mode Power Suplly
STANDBY Switching signal; "low" for standby (only line is shut), "high" for normal operation
SYNC Synchronisation
TP-1 Tets point 1
UHF Ultra High Frecuency band from tuning range
V-IN The DC voltage across C2505 present at pin 11 of the primary side of the transformer
V-VARI Tuning voltage (0-30V)
VERT FEEDBLACK 50Hz vertical flyback pulse used for locking the vertical oscillator in IC7015/6E
VERT FLYBACK 50Hz vertical flyback pulse from frame IC7400 lo lock the OSD generator in µC
VERT DRIVE Vertical drive signal from IC7415/6E to frame amplifier IC7400
Vg2 Voltage on Grid 2 of the picture tube
VHF Very High Frecuency band from tuning range
VOLUME Control signal (from µC, but on DC level via RC network) for volume control of sound processing in IC7015/6F
VST Voltage Synthesized Tuning
Y Luminance part of video signal