Sanyo CE14A2-C - Page 16

Service manual CHASSIS 2112-Series EC7-A
1
INDEX
1. SAFETY INSTRUCTIONS..................................................................................................................................... 3
1.1 W
ARNING
. ........................................................................................................................................................ 3
1.2 P
RECAUTIONS AGAINST
X-R
AYS
. ....................................................................................................................... 3
1.3 R
ECOMMENDATIONS TO PROTECT OUR ENVIRONMENT
......................................................................................... 3
1.4 S
AFETY AND
EMC (E
LECTROMAGNETIC
C
OMPATIBILITY
). ................................................................................... 3
2. TECHNICAL CHARATERISTICS. ........................................................................................................................ 4
3. BLOCK DIAGRAM................................................................................................................................................ 5
3.1 I
NTEGRATED CIRCUITS
....................................................................................................................................... 6
4. DETAILED DESCRIPTION IN BLOCKS .............................................................................................................. 6
4.1 P
OWER SUPPLY
. ............................................................................................................................................... 6
4.1.1 Switched Mode Power Supply (SMPS)..................................................................................................... 6
4.1.1.1 IC800 controller start-up..................................................................................................................... 6
4.1.2 Normal functioning ("on").......................................................................................................................... 6
4.1.2.1 Duty cycle........................................................................................................................................... 6
4.1.2.2 Regulation. ......................................................................................................................................... 6
4.1.3 "Stand-by"................................................................................................................................................. 7
4.1.4 “+8v” and “+5v” regulators ........................................................................................................................ 7
4.1.4.1 Configuration...................................................................................................................................... 7
4.1.4.2 “stand-by” / ”ON” control .................................................................................................................... 7
4.1.4.3 Regulator output short circuit protection. ........................................................................................... 7
4.1.4.4 Mains switch off detection.................................................................................................................. 7
4.1.4.5 Power supply signals and micro signals interrelation......................................................................... 8
4.2 T
ELETEXT AND MICROPROCESSOR
. .................................................................................................................... 8
4.2.1 Ports description....................................................................................................................................... 8
4.2.2 Supply....................................................................................................................................................... 9
4.2.3 Oscillator................................................................................................................................................... 9
4.2.4 Reset. ....................................................................................................................................................... 9
4.2.5 RGB output, character generator.............................................................................................................. 9
4.2.5.1 Character generator synchronism...................................................................................................... 9
4.2.5.2 RGB output voltage............................................................................................................................ 9
4.2.6 Teletext (only for ST92195 version).......................................................................................................... 9
4.2.6.1 Non-interlaced.................................................................................................................................. 10
4.2.7 –PD signal. ............................................................................................................................................. 10
4.2.8 ON signal................................................................................................................................................ 10
4.2.9 Radio control signals. ............................................................................................................................. 10
4.2.10 SC signal. ............................................................................................................................................ 10
4.2.11 –SUP_FAIL signal. .............................................................................................................................. 10
4.2.12 –AM/SCART signal.............................................................................................................................. 10
4.2.13 –LP/L signal......................................................................................................................................... 10
4.2.14 –AM/FM signal..................................................................................................................................... 10
4.2.15 –DEFL_FAIL signal. ............................................................................................................................ 10
4.2.16 I2C bus and peripherics connected to (SDA y SCL). .......................................................................... 10
4.2.17 CF1 and CF2 signals........................................................................................................................... 10
4.2.18 Tuning control signals (-AGC_LS, -LB, -MB, -HB, VTUNE)................................................................ 10
4.2.19 BEEP signal......................................................................................................................................... 11
4.2.20 WIDTH signal. ..................................................................................................................................... 11
4.2.21 MUTE signal........................................................................................................................................ 11
4.2.22 LED signal. .......................................................................................................................................... 11
4.2.23 Customer instructions reception (IR and KEY signals). ...................................................................... 11
4.3 H
ORIZONTAL DEFLECTION
................................................................................................................................11
4.3.1 Driver stage. ........................................................................................................................................... 11
4.3.1.1 Driver stage power........................................................................................................................... 11
4.3.1.2 Driver stage start-up......................................................................................................................... 11
4.3.2 Line stage. .............................................................................................................................................. 11
4.3.3 Width adjustment.................................................................................................................................... 12
4.3.4 H_FLY&SYNC signal generation............................................................................................................ 12
4.3.5 Recovered line voltages. ........................................................................................................................ 12