Vestel ST92195, STV224X Schematic Diagram
CONTENTS
SAFETY PRECAUTIONS: ................................................................................................................................................. 2
TV set switched off ....................................................................................................................................................... 2
Measurements ............................................................................................................................................................. 2
PERI-TV SOCKET ............................................................................................................................................................. 2
SCART 1 ....................................................................................................................................................................... 2
SCART 2 ....................................................................................................................................................................... 2
1. INTRODUCTION ........................................................................................................................................................... 2
2. SMALL SIGNAL PART WITH STV2248 .................................................................................................................... 3
2.1 Vision IF amplifier ................................................................................................................................................... 3
2.2 QSS Sound circuit (QSS versions) ......................................................................................................................... 3
2.3 FM demodulator and audio amplifier (mono versions) ......................................................................................... 3
2.4 Video switch ........................................................................................................................................................... 3
2.5 Synchronisation circuit ........................................................................................................................................... 3
2.6 Chroma and luminance processing ...................................................................................................................... 4
2.7 RGB output circuit ................................................................................................................................................... 4
2.8 -Controller ............................................................................................................................................................. 5
3. TUNER .......................................................................................................................................................................... 5
4- DIGITAL TV SOUND PROCESSOR MSP34X0 ............................................................................................................. 5
5. SOUND OUTPUT STAGE TDA7266L/TDA7266 ........................................................................................................... 5
6. VERTICAL OUTPUT STAGE WITH TDA8174A ............................................................................................................. 6
7. VIDEO OUTPUT AMPLIFIER STV5112 ......................................................................................................................... 6
8. POWER SUPPLY (SMPS) ............................................................................................................................................. 6
9. POWER FACTOR CORRECTION ................................................................................................................................ 6
10. SERIAL ACCESS CMOS 8K EEPROM 24C08 ........................................................................................................... 6
11. CLASS AB STEREO HEADPHONE DRIVER TDA1308 .............................................................................................. 6
12. SAW FILTERS ............................................................................................................................................................. 6
13. IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM ............................................................................................ 6
• ST92195 .................................................................................................................................................................. 7
• STV224X ............................................................................................................................................................... 8-9
• UV1315, UV1316, UV1336 ...................................................................................................................................... 9
• TDA7266/TDA7266L .......................................................................................................................................... 9-10
• TDA8174AW .......................................................................................................................................................... 10
• STV5112 ................................................................................................................................................................. 11
• MC44608 .......................................................................................................................................................... 11-12
• MSP34X0G ............................................................................................................................................................ 12
• 24C08 ............................................................................................................................................................... 12-13
• TDA1308 ................................................................................................................................................................ 13
• SAW FILTERS ........................................................................................................................................................ 13
CIRCUIT DESCIRIPTION ....................................................................................................................................... 14-18
AK30 CHASSIS MANUAL ADJUSTMENT PROCEDURE ........................................................................................ 19-21
OPTIONAL SETTINGS ............................................................................................................................................ 22-23
TUNER SETTING ......................................................................................................................................................... 24
14. BLOCK DIAGRAM of 11AK30 .................................................................................................................................... 25
BLOCK DIAGRAM of 11AK30 SMPS ........................................................................................................................ 26
BLOCK DIAGRAM of 11AK30 uCONTROLLER ....................................................................................................... 27
BLOCK DIAGRAM of 11AK30 VIDEO........................................................................................................................ 28
BLOCK DIAGRAM of 11AK30 STEREO.................................................................................................................... 29
BLOCK DIAGRAM of 11AK30 SCART ...................................................................................................................... 30
BLOCK DIAGRAM of 11AK30 DEFLECTION ............................................................................................................ 31
BLOCK DIAGRAM of 11AK30 BASE BOADR............................................................................................................ 32
15. CIRCUIT DIAGRAM of VIDEO PRECESSOR ........................................................................................................... 33
CIRCUIT DIAGRAM of SMPS .................................................................................................................................... 34
CIRCUIT DIAGRAM of MICRO CONTROLLER ......................................................................................................... 35
CIRCUIT DIAGRAM of AUDIO-VIDEO ........................................................................................................................ 36
CIRCUIT DIAGRAM of DEFLECTION ........................................................................................................................ 37
CIRCUIT DIAGRAM of STEREO ................................................................................................................................ 38
WAVEFORMS ............................................................................................................................................................ 39
1
DO NOT CHANGE ANY MODULE UNLESS THE SET IS SWITCHED OFF
The mains supply part of the switch mode power supply’s transformer is live.
Use an isolating transformer.
The receiver complies with the safety requirements.
SAFETY PRECAUTIONS:
The service of this TV set must be carried out by qualified persons only. Components marked with the warning symbol
on the circuit diagram are critical for safety and must only be replaced with an identical component.
- Power resistor and fused resistors must be mounted in an identical manner to the original component.
- When servicing this TV, check that the EHT does not exceed 26kV.
TV set switched off:
Make short-circuit between HV-CRT clip and CRT ground layer.
Short C809 before changing IC800 and IC801 or other components in primary side of the SMPS part.
Measurements:
Voltage readings and oscilloscope traces are measured under the following conditions:
Antenna signal’s level is 60dB at the color bar pattern from the TV pattern generator. (100% white, 75% color saturation)
Brightness, contrast, and color are adjusted for normal picture performance.
Mains supply, 220VAC, 50Hz.
PERI-TV SOCKET
SCART 1 (SC050) SCART 2 (SC051)
1 Audio right output 0.5Vrms / 1K 1 Audio right output 0.5Vrms / 1K
2 Audio right input 0.5Vrms / 10K 2 Audio right input 0.5Vrms / 10K
3 Audio left output 0.5Vrms / 1K 3 Audio left output 0.5Vrms / 1K
4 Ground AF 4 Ground AF
5 Ground Blue 5 Ground Blue
6 Audio left input 0.5Vrms / 10K 6 Audio left input 0.5Vrms / 10K
7 Blue input 0.7Vpp / 75ohm 7 Blue input 0.7Vpp / 75ohm
8 AV switching input 0-12VDC /10K 8 AV switching input 0-12VDC /10K
9 Ground Green 9 Ground Green
10 - 10 11 Green input 0.7Vpp / 75ohm 11 12 - 12 13 Ground Red 13 Ground Red
14 Ground Blanking 14 Ground Blanking
15 Red input 0.7Vpp / 75ohm 15 16 Blanking input 0-0.4VDC, 1-3VDC / 75ohm 16 17 Ground CVBS output 17 Ground CVBS output
18 Ground CVBS input 18 Ground CVBS input
19 CVBS output 1Vpp / 75ohm 19 CVBS output 1Vpp / 75ohm
20 CVBS input 1Vpp / 75ohm 20 CVBS input 1Vpp / 75ohm
21 Ground 21 Ground
1. INTRODUCTION
11AK30 is a 90° chassis capable of driving 20”/21” tubes at the appropriate currents. The chassis is capable of operating
in PAL, SECAM and NTSC standards. The sound system is capable of giving 5 watts RMS output into a load of 8 ohms.
One page, 7 page SIMPLETEXT, TOPTEXT, FASTTEXT and US Closed Caption is also provided. The chassis is equipped
with a double-deck 42 pin Scart connector.
2
2. SMALL SIGNAL PART WITH STV2248:
STV2248 video processor is essential for realizing all small signal functions for a color TV receiver.
2.1 Vision IF amplifier3
The vision IF amplifier can demodulate signals with positive and negative modulation. The PLL demodulator is completely
alignment-free. Although the VCO (Toko-coil) of the PLL circuit is external, yet the frequency is fixed to the required value
by the original manufacturer thus the Toko-coil does not need to be adjusted manually. The setting of the various
frequencies (38.9 or 45.75 MHz) can be made via changing the coil itself.
2.2 QSS Sound circuit (QSS versions)
The sound IF amplifier is similar to the vision IF amplifier and has an external AGC de-coupling capacitor. The single
reference QSS mixer is realised by a multiplier. In this multiplier the SIF signal is converted to the inter-carrier frequency
by mixing it with the regenerated picture carrier from the VCO. The mixer output signal is supplied to the output via a
high-pass filter for attenuation of the residual video signals. With this system a high performance hi-fi stereo sound
processing can be achieved. The AM sound demodulator is realised by a multiplier. The modulated sound IF signal is
multiplied in phase with the limited SIF signal. The demodulator output signal is supplied to the output via a low-pass filter
for attenuation of the carrier harmonics. The AM signal is supplied to the output via the volume control.
2.3. AM DEMODULA T OR
The AM demodulated signal results from multiplying the input signal by itself, it is available on AM/FM output.
2.3 FM demodulator and audio amplifier (mono versions):
The FM demodulator is realized as narrow-band PLL with external loop filter, which provides the necessary selectivity
without using an external band-pass filter. To obtain a good selectivity a linear phase detector and constant input signal
amplitude are required. For this reason the inter-carrier signal is internally supplied to the demodulator via a gain
controlled amplifier and AGC circuit. The nominal frequency of the demodulator is tuned to the required frequency (4.5/
5.5/6.0/6.5 MHz) by means of a calibration circuit that uses the clock frequency of the -controller/Teletext decoder as a
reference. The setting to the wanted frequency is realized by means of the software. It can be read whether the PLL
frequency is inside or outside the window and whether the PLL is in lock or not. With this information it is possible to
make an automatic search system for the incoming sound frequency. This is realized by means of a software loop that
alternate the demodulator to various frequencies, then select the frequency on which a lock condition has been found.
De-emphasis output signal amplitude is independent of the TV standard and has the same value for a frequency deviation
of ±25 kHz at the 4.5 MHz standard and for a deviation of ±50 kHz for the other standards. When the IF circuit is
switched to positive modulation the internal signal on de-emphasis pin is automatically muted. The audio control circuit
contains an audio switch and volume control. In the mono inter-carrier sound versions the Automatic Volume Leveling
(AVL) function can be activated. The pin to which the external capacitor has to be connected depends on the IC version.
For the 90° types the capacitor is connected to the EW output pin (pin 20). When the AVL is active it automatically
stabilizes the audio output signal to a certain level.
2.4 Video switching
The video processor (STV2248C) has three CVBS inputs and two RGB inputs. The first CVBS input is used for external
CVBS from SCART 1, the second is used for either CVBS or Y/C from either SCART2 or BAV/FAV, and the third one is used
for internal video. The selection between both external video inputs signals is realized by means of software and hardware
switches.
2.5 Synchronization circuit
The video processor (STV224X) performs the horizontal and vertical processing. The external horizontal deflection circuit
is controlled via the Horizontal output pulse (HOUT). The vertical scanning is performed through an external ramp
generator and a vertical power amplifier IC controlled by the Vertical output pulse (VOUT).
The main components of the deflection circuit are:
• PLL1: the first phase locked loop that locks the internal line frequency reference on the CVBS input signal.
It is composed of an integrated VCO (12 MHz) that requires the chroma Reference frequency (4.43MHz or 3.58MHz
crystal oscillator reference signal), a divider by 768, a line decoder, and a phase comparator.
• PLL2: The second phase locked loop that controls the phase of the horizontal output (Compensation of horizontal
deflection transistor storage time variation). Also the horizontal position adjustment is also performed in PLL2.
• A vertical pulse extractor.
• A vertical countdown system to generate all vertical windows (vertical synchronization window, frame blanking pulses,
50/60Hz identification window...).
• Automatic identification of 50/60Hz scanning.
• PLL1 time constant control.
• Noise detector, video identification circuits, and horizontal coincidence detector.
• Vertical output stage including de-interlace function, vertical position control.
• Vertical amplitude control voltage output (combined with chroma reference output and Xtal 1 indication).
3
2.6 Chroma and luminance processing:
The chroma decoder is able to demodulate PAL, NTSC and SECAM signals. The decoder dedicated to PAL and NTSC
sub-carrier is based on a synchronous demodulator, and an Xtal PLL locked on the phase reference signal (burst).
The SECAM demodulation is based on a PLL with automatic calibration loop.
The color standard identification is based on the burst recognition.
Automatic and forced modes can be selected through the I2C bus.
NTSC tint, and auto flesh are controlled through I2C bus.
Xtal PLL can handle up to 3 crystals to work in PAL M, PAL N and NTSC M for South America.
ACC an ACC overload control the chroma sub-carrier amplitude within 26dB range. Both
ACC s are based on digital systems and do not need external capacitor.
All chroma filters are fully integrated and tuned via a PLL locked on Xtal VCO signal.
A second PLL is used for accurate fine-tuning of the SECAM bell filter. This tuning is achieved during the frame blanking.
An external capacitor memorizes the bell filter tuning voltage.
A base-band chroma delay-line rebuilds the missing color line in SECAM and removes transmission phase errors in PAL.
The base-band chroma delay line is clocked with 6MHz signal provided by the horizontal scanning VCO.
The luminance processor is composed of a chroma trap filter, a luminance delay line, a peaking function with noise coring
feature, a black stretch circuit.
Trap filter and luminance delay lines are achieved with the use of bi-quad integrated filters, auto-aligned via a master filter
phase locked loop.
2.7 RGB output circuit:
The video processor performs the R, G, B processing.
There are three sources:
1. Y,U,V inputs (coming from luma part (Y output), and chroma decoder outputs (R-Y, B-Y outputs).
2. External R,G,B inputs from SCART (converted internally in Y,U,V), with also the possibility to input YUV signals from
a DVD player, (YUV specification is Y=0.7 V PP , U= 0.7 V PP , V = 0.7V PP for 100% color bar).
3. Internal R,G,B inputs (for OSD and Teletext display)
The main functions of the video part are:
Y,U,V inputs with integrated clamp loop, allowing a DC link with YUV outputs,
External RGB inputs (RGB to YUV conversion), or direct YUV inputs,
Y,U,V switches,
Contrast, saturation, brightness controls,
YUV to RGB matrix,
OSD RGB input stages (with contrast control),
RGB switches,
APR function,
DC adjustment of red and green channels,
Drive adjustments (R, G, B gain),
Digital automatic cut-off loop control,
Manual cut-off capability with I2C adjustments,
Half tone, oversize blanking, external insertion detection, blue screen,
Blanking control and RGB output stages.
2.8 -Controller
The ST92195 is the micro-controller, which is required for a color TV receiver. ST92195D1 is the version with one page
Teletext and ST92195D7 is the one with 7 page Teletext. The IC has the supply voltages of 5 V and they are mounted in
PSDIP package with 56 pins.
-Controller has the following features
Display of the program number, channel number, TV Standard, analogue values, sleep timer, parental control and
mute is done by OSD
Single LED for standby and on mode indication
System configuration with service mode
3 level logic output for SECAM and Tuner band switching
4
3. TUNER
Either a PLL or a VST tuner is used as a tuner.
UV1316 (VHF/UHF) is used as a PLL tuner. For only PALM/N, NTSC M applications UV 1336 is used as the
PLL tuner. UV 1315 (VHF/UHF) is used as a VST Tuner.
Channel coverage of UV1316:
OFF-AIR CHANNELS CABLE CHANNELS
BAND
FREQUENCY
RANGE (MHz)
CHANNELSCHANNELS
Low Band E2 to C 48.25 to 82.25 (1) S01 to S08 69.25 to 154.25
Mid Band E5 to E12 175.25 to 224.25 S09 to S38 161.25 to 439.25
High Band E21 to E69 471.25 to 855.25 (2) S39 to S41 447.25 to 463.25
(1). Enough margin is available to tune down to 45.25 MHz.
(2). Enough margin is available to tune up to 863.25 MHz.
Noise Typical Max. Gain Min. Typical Max.
Low band : 5dB 9dB All channels : 38dB 44dB 52dB
Mid band : 5dB 9dB Gain Taper (of-air channels) : 8dB
High band : 6dB 9dB
Channel Coverage UV1336:
FREQUENCY
RANGE (MHz)
BAND
CHANNELS
FREQUENCY
RANGE (MHz)
Low Band 2 to D 55.25 to 139.25
Mid Band E to PP 145.25 to 391.25
High Band QQQ to 69 397.25 to 801.25
Noise is typically 6dB for all channels. Gain is minimum 38dB and maximum 50dB for all channels.
Channel Coverage of UV1315:
OFF-AIR CHANNELS CABLE CHANNELS
BAND
FREQUENCY
RANGE (MHz)
CHANNELSCHANNELS
FREQUENCY
RANGE (MHz)
Low Band E2 to C 48.25 to 82.25 (1) S01 to S08 69.25 to 168.25
Mid Band E5 to E12 175.25 to 224.25 S11 to S39 231.25 to 447.25
High Band E21 to E69 471.25 to 855.25 (2) S40 to S41 455.25 to 463.25
(1). Enough margin is available to tune down to 45.25 MHz.
(2). Enough margin is available to tune up to 863.25 MHz.
Noise Typ. Max. Gain Min. Typ. Max.
Low band 6dB 9dB All Channels 38dB 44dB 50dB
Mid band 6dB 10dB Gain Taper 8dB
High band 6dB 11dB (off-air channels)
4. DIGITAL TV SOUND PROCESSOR MSP34X0
The MSP 34x0D is designed to perform demodulation of FM or AM-Mono TV sound. Alternatively, two-carrier FM systems
according to the German or Korean terrestrial specs or the satellite specs can be processed with the MSP 34x0D. Digital
demodulation and decoding of NICAM-coded TV stereo sound, is done only by the MSP 3410. The MSP 34x0D offers a
powerful feature to calculate the carrier field strength which can be used for automatic standard detection (terrestrial) and
search algorithms (satellite).
5. SOUND OUTPUT ST AGE TDA7266L/TDA7266
TDA7266L is used as the AF output amplifier for mono applications. It is supplied by +12VDC coming from a separate
winding in the SMPS transformer. An output power of 5.5W (THD=0.5%) can be delivered into an 8ohm load.
TDA7266 is used as the AF output amplifier for stereo applications. It is supplied by
+12VDC coming from a separate winding in the SMPS transformer. An output power of 2*5.5W (THD=0.5%) can be delivered
into an 8ohm load.
5
6. VERTICAL OUTPUT STAGE WITH TDA8174A
The TDA8174A is a power amplifier circuit for use in 90° and 110° colour deflection systems for 25 to 200 Hz field
frequencies, and for 4 : 3 and 16 : 9 picture tubes.
7. VIDEO OUTPUT AMPLIFIER STV5112
The STV5112 consists of three monolithic video output amplifiers. The amplifier can be seen as an operational amplifier
with negative feedback. The advantage of negative feedback is that the amplifier characteristics do not play an important
role up to certain frequencies. The internal flash diodes protect the amplifiers against flash over in the picture tube.
The only protections required at the cathode outputs are a flash resistor and a spark gap.
Furthermore, the device has a high voltage power supply (VDD) and a low voltage one (VCC).
8. POWER SUPPLY (SMPS)
The DC voltages required at various parts of the chassis are provided by an SMPS transformer controlled by the IC
MC44608 which is designed for driving, controlling and protecting switching transistor of SMPS. The transformer produces
115V for FBT input, ±14V for audio output IC, S+3.3, S+5V and 8V for ST92195.
9. POWER FACTOR CORRECTION
Passive components are used for the solution of power factor correction.
10. SERIAL ACCESS CMOS 8K EEPROM 24C08
The 24C08 is a 8Kbit electrically erasable programmable memory (EEPROM), organized as 4 blocks of 256*08 bits.The
memory is compatible with the I²C standard, two wire serial interface which uses a bi-directional data bus and serial clock.
11. CLASS AB STEREO HEADPHONE DRIVER TDA1308
The TDA1308 is an integrated class AB stereo headphone driver contained in a DIP8 plastic package
12. SAW FILTERS
Saw filter type : Model:
G1975M : PAL B/G MONO
K2966M : PAL SECAM B/G/D/K/I MONO
J1981 : PAL-I MONO
K2958M : PAL-SECAM B/G-D/K (38) MONO
K2962M : PAL-SECAM B/G/D/K/I/L/L’ MONO
L9653M : SECAM L/L’ AM MONO (AUDIO IF)
G3967M : PAL-SECAM B/G STEREO (VIDEO IF)
G9353M : PAL-SECAM B/G STEREO (AUDIO IF)
K3958M : PAL-SECAM B/G/D/K/I/L/L’ STEREO (VIDEO IF)
K9356M : PAL-SECAM B/G/D/K/I STEREO (AUDIO IF)
K9656M : PAL-SECAM B/G/D/K/I/L/L’ STEREO (AUDIO IF)
K3958M : PAL I NICAM (VIDEO IF)
K9356M : PAL I NICAM (AUDIO IF)
M1962M : PAL M/N NTSC M MONO
M3953M : PAL M/N NTSC M STEREO (VIDEO IF)
M9370M : PAL M/N NTSC M STEREO (AUDIO IF)
IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM
• ST92195
• STV224X
• TUNER (UV1315, UV1316, UV1336)
• TDA7266L / TDA7266M
• TDA8174A
• STV5112
• MC44608
• MSP34X0D
• 24C08
• TDA1308
• SAW FILTERS
G1975M, K2966M, K2962M, L9653M, G3962M, G9353M, K3958M, K9356M, K9656M, K6263K,
K9652M, M1962M, M3953M, M9370M
6
ST92195
The ST92195 is a member of the ST9+ family of micro-controllers, completely developed and produced by SGSTHOMSON Microelectronics using a proprietary n-well HCMOS process. The nucleus of the ST92195 is the advanced
Core, which includes the Central Processing Unit (CPU), the ALU, the Register File and the interrupt controller. The Core
has independent memory and register buses to add to the efficiency of the code. A set of on-chip peripherals form a
complete sys-tem for TV set and VCR applications:
• Voltage Synthesis
• VPS/WSS Slicer
• Teletext Slicer
• Teletext Display RAM
• OSD
Additional peripherals include a watchdog timer, a serial peripheral interface (SPI), a 16-bit timer and an A/D converter.
u-CONTROLLER VERSİON TABLE
FEATURE DESCRIPTION
NO TXT MONO IC ST92195C 48K SW-A
NO TXT MONO
1 P MONO
1 P MONO / STR
7 P MONO/STR/WSS
1 P MONO/STR/APS/WSS
IC ST92185B SW-B
IC ST92195C 48K SW-D
IC ST92195C 48K SW-E
IC ST92195C 64K SW-F
IC ST92195C 64K SW-G
7
STV224X Video processor:
The STV2246/2247/2248 are fully bus controlled ICs for TV including PIF, SIF, luma, Chroma and deflection processing.
Used with a vertical frame booster (TDA1771 or TDA8174 for 90° chassis, STV9306 for 110° chassis), they allow the
design of multi-standard (BGDKIMNLL, PAL/ SECAM/NTSC) sets with very few external components and no manual
adjustments.
VIDEO PROCESSOR IC TABLE
UV1315, UV1316, UV1336
General description of UV1315:
BAND
VIDEO IC
Low Band 0 V 0 V +5V
Mid Band 0 V +5V 0 V
STV 2246
High Band +5V 0 V 0 V
STV 2247
STV 2248OKOK
PIN 3 PIN 3 PIN 3
AUDIO STEREO PAL SECAM NTSC
-
OK
-
OKOK OK
OKOK OK OK
-
OK
-
The UV1315 tuner belongs to the UV 1300 family of tuners, which are designed to meet a wide range of applications. It is a
combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L’, I and I’.
Features of UV1315:
• Member of the UV1300 family small sized UHF/VHF tuners
• Systems CCIR:B/G, H, L, L’, I and I’; OIRT:D/K
• Voltage synthesized tuning (VST)
• Off-air channels, S-cable channels and Hyper-band
• Standardized mechanical dimensions and pinning
PINNING PIN V ALUE
1. Gain control voltage (AGC) : 4.0V, Max:4.5V
2. Tuning voltage
3. High band switch : 5V, Min:4.75V, Max:5.5V
4. Mid band switch : 5V, Min:4.75V, Max:5.5V
5. Low band switch : 5V, Min:4.75V, Max:5.5V
6. Supply voltage : 5V, Min:4.75V, Max:5.5V
7. Not connected
8. Not connected
9. Not connected
10.Symmetrical IF output 1
11. Symmetrical IF output 2
Band switching table:
8
General description of UV1316:
The UV1316 tuner belongs to the UV 1300 family of tuners, which are designed to meet a wide range of applications. It is a
combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L’, I and I’.
Features of UV1316:
• Member of the UV1300 family small sized UHF/VHF tuners
• Systems CCIR: B/G, H, L, L’, I and I’; OIRT: D/K
• Digitally controlled (PLL) tuning via I²C-bus
• Off-air channels, S-cable channels and Hyper-band
• World standardized mechanical dimensions and world standard pinning
• Complies to “CENELEC EN55020” and “EN55013”
PINNING PIN V ALUE
1. Gain control voltage (AGC) : 4.0V, Max:4.5V
2. Tuning voltage
3. I²C-bus address select : Max:5.5V
4. I²C-bus serial clock : Min:-0.3V, Max:5.5V
5. I²C-bus serial data : Min:-0.3V, Max:5.5V
6. Not connected
7. PLL supply voltage : 5.0V, Min:4.75V, Max:5.5V
8. ADC input
9. Tuner supply voltage : 33V, Min:30V, Max:35V
10. Symmetrical IF output 1
11. Symmetrical IF output 2
General description of UV1336:
UV1336 series is developed for reception of channels broadcast in accordance with the M, N standard.
Features of UV1336:
• Global standard pinning
• Integrated Mixer-Oscillator & PLL function
• Conforms to CISPR 13, FCC and DOC (Canada) regulations
• Low power consumption
• Both Phono connector and ‘F’ connector are available
PINNING PIN V ALUE
1. Gain control voltage : 4.0V, Max:4.5V
2. Tuning voltage
3. Address select Max :5.5V
4. Serial cloc : Min :-0.3V, Max:5.5V
5. Serial data : Min :-0.3V, Max:5.5V
6. Not connected
7. Supply voltage : 5.0V, Min:4.75V, Max:5.5V
8. ADC input (optional)
9. Tuning supply voltage : 33V, Min:30V, Max:35V
10. Ground
11. IF output
TDA7266/TDA7266L
General Description of TDA7266L
The TDA7266L is a mono bridge amplifier specially designed for TV and Portable Radio applications.
Requires very few external components
WIDE SUPPLY VOLTAGE RANGE (3-18V)
MINIMUM EXTERNAL COMPONENTS
– NO SVR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
STAND-BY & MUTE FUNCTIONS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
9
PINNING
1. N.C
2. N.C.
3. MUTE
4. ST-BY
5. PW-GND
6. S-GND
7. IN
8. VCC
9. OUT+
10. OUT -
General Description of TDA7266
The TDA7266 is a 2x7 Watt dual power amplifier. It is used for sound amplification at stereo TV sets.
WIDE SUPPLY VOLTAGE RANGE (3-18V)
MINIMUM EXTERNAL COMPONENTS
– NOSWR CAPACITOR
– NOBOOTSTRAP
– NOBOUCHEROT CELLS
– INTERNALLY FIXED GAIN
STAND-BY & MUTE FUNCTIONS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
PINNING
1. OUT1+
2. OUT1 –
3. VCC
4. IN1
5. N.C.
6. MUTE
7. ST-BY
8. PW-GND
9. S-GND
10. N.C.
11. N.C.
12. IN2
13. VCC
14. OUT2 -
15. OUT2+
TDA8174AW
INDEPENDENT VERTICAL AMPLITUDE ADJUSTEMENT.
BUFFER STAGE.
POWER AMPLIFIER.
FLYBACKGENERATOR.
THERMALPROTECTION.
INTERNAL REFERENCE VOLTAGE DECOU-PLING
General Description:
TDA8174Aand TDA8174AWare a monolithic integrated circuits. It is a full performance and very efficient vertical deflection
circuit intended for direct drive of a TV picture tube in Color and B & W television as well as in Monitor and Data displays.
PINNING
1. POWER OUTPUT
2. OUTPUT STAGE Vs
3. TRIGGER INPUT
4. HEIGHT ADJUSTMENT
5. VOLTAGE REF DECOUPLING
6. GROUND
7. RAMP GENERATOR
8. BUFFER OUTPUT
9. INVERTING INPUT
10. Vs
11. FLYBACK GENERATOR
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STV5112
BANDWIDTH : 6MHz TYPICAL
SUPPLY VOLTAGE : 220V TYPICAL
RISE AND FALL TIME : 50ns TYPICAL
CRT CATHODE CURRENT OUTPUTS FOR
PARALLEL OR SEQUENTIAL CUT-OFF OR
DRIVE ADJUSTMENT
FLASHOVER PROTECTION
POWER DISSIPATION : 3.6W
General Description:
The STV5112 includes three video amplifiers designed with a high voltage bipolar/CMOS/DMOS technology (BCD).
It drives directly the three cathodes and is protected against flashovers. Thanks to its three cathode current outputs,
the STV5112 can be used with both parallel and sequential sampling applications.
PINNING
1. BLUE INPUT
2. VCC LOW VOLTAGE
3. GREEN INPUT
4. RED INPUT
5. VDD HIGH VOLTAGE
6. RED CATHODE CURRENT
7. RED OUTPUT
8. GROUND
9. RED FEEDBACK
10. GREEN OUTPUT
11. GREEN CATHODE CURRENT
12. GREEN FEEDBACK
13. BLUE OUTPUT
14. BLUE CATHODE
15. BLUE FEEDBACK
MC44608
General description:
The MC44608 is a high performance voltage-mode controller designed for off–line converters. This high voltage circuit
that integrates the start–up current source and the oscillator capacitor, requires few external components while offering
a high flexibility and reliability.
The device also features a very high efficiency stand–by management consisting of an effective Pulsed Mode operation.
This technique enables the reduction of the stand–by power consumption to approximately 1W while delivering 300mW
in a 150W SMPS.
• Integrated start–up current source
• Loss less off–line start–up
• Direct off–line operation
• Fast start–up
General Features
• Flexibility
• Duty cycle control
• On chip oscillator switching frequency 40, or 75kHz
• Secondary control with few external components
Protections
• Maximum duty cycle limitation
• Cycle by cycle current limitation
• Demagnetization (Zero current detection) protection
• “Over V CC protection” against open loop
• Programmable low inertia over voltage protection against open loop
• Internal thermal protection
GreenLine Controller
• Pulsed mode techniques for a very high efficiency low power mode
• Lossless startup
• Low dV/dT for low EMI radiations
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PINNING PIN V ALUE
1. Demagnetization Zero cross detection voltage : 50 mV typ.
2. I Sense Over current protection voltage 1V typ.
3. Control Input Min : 7.5V Max. : 18V
4. Ground Iout 2A
during scan 1.2A
p-p
during flyback
p-p
5. Driver Output resistor 8.5 Ohm sink 15 Ohm source typ.
6. Supply voltage Max : 16V (Operating range 6.6V-13V)
7. No connection
8. Line Voltage Min : 50V Max : 500V
MSP34X0D
The MSP 34x0D is designed to perform demodulation of FM or AM-Mono TV sound. Two kinds of MSP’s are used. MSP
3400D and MSP 3410D. The MSP 3400D is fully pin and software-compatible to the MSP 3410D, but is not able to decode
NICAM. It is also compatible to the MSP 3400C.
General description:
Demodulator and NICAM Decoder Section
The MSP 34x0D is designed to perform demodulation of FM or AM-Mono TV sound. Alternatively, two-carrier FM systems
according to the German or Korean terrestrial specs or the satellite specs can be processed with the MSP 34x0D. Digital
demodulation and decoding of NICAM-coded TV stereo sound, is done only by the MSP 3410. The MSP 34x0D offers a
powerful feature to calculate the carrier field strength, which can be used for automatic standard detection (terrestrial) and
search algorithms (satellite).
General Features
• Two selectable analog inputs (TV and SAT-IF sources)
• Automatic Gain Control (AGC) for analog IF input. Input range: 0.10–3 V pp
• Integrated A/D converter for sound-IF inputs
• All demodulation and filtering is performed on chip and is individually programmable
• Easy realization of all digital NICAM standards (B/G, D/K, I & L) with MSP 3410G.
• FM demodulation of all terrestrial standards (incl. identification decoding)
• FM demodulation of all satellite standards
• No external filter hardware is required
• Only one crystal clock (18.432 MHz) is necessary
• FM carrier level calculation for automatic search algorithms and carrier mute function
DSP Section (Audio Base band Processing)
• Flexible selection of audio sources to be processed
• Two digital input and one output interface via I 2 S bus for external DSP processors, featuring surround sound, ADR etc.
• Digital interface to process ADR (ASTRA Digital Radio) together with DRP 3510A
• Performance of all de-emphasis systems including adaptive Wegener Panda 1 without external components or controlling
• Digitally performed FM identification decoding and de-matrixing
• Digital base-band processing: volume, bass, treble, 5-band equalizer, loudness, pseudo-stereo, and base-width
enlargement
• Simple controlling of volume, bass, treble, equalizer etc.
Analog Section
• four selectable analog pairs of audio base-band inputs (= four SCART inputs) input level : = < 2 V RMS,
input impedance : >= 25 kW
• one analog mono input (i.e. AM sound): input level : = < 2 V RMS , input impedance : > = 15 kW
• two high-quality A/D converters, S/N-Ratio : > = 85 dB
• 20 Hz to 20 kHz bandwidth for SCART-to-SCART copy facilities
24CO8
General description:
The 24C16 is a 8Kbit electrically erasable programmable memory (EEPROM), organized as 4 blocks of 256 * 08 bits.
The memory operates with a power supply value as low as 2.5V.
Features:
• Minimum 1 million ERASE/WRITE cycles with over 10 years data retention
• Single supply voltage:4.5 to 5.5V
• Two wire serial interface, fully I²C-bus compatible
• Byte and Multi-byte write (up to 8 bytes)
• Page write (up to 16 bytes)
• Byte, random and sequential read modes
• Self timed programming cycle
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PINNING PIN V ALUE
1. Write protect enable : 0V
2. Not connected : 0V
3. Chip enable input : 0V
4. Ground : 0V
5. Serial data address input/output : Input LOW voltage : Min : -0.3V, Max : 0.3*Vcc
: Input HIGH voltage : Min : 0.7*Vcc, Max : Vcc+1
6. Serial clock : Input LOW voltage : Min : -0.3V, Max : 0.3*Vcc
: Input HIGH voltage : Min : 0.7*Vcc, Max : Vcc+1
7. Multibyte/Page write mode : Input LOW voltage : Min : -0.3V, Max : 0.5V
: Input HIGH voltage : Min : Vcc-0.5, Max : Vcc+1
8. Supply voltage : Min :2.5V, Max : 5.5V
TDA1308
Features:
• Wide temperature range
• Excellent power supply ripple rejection
• Low power consumption
• Short-circuit resistant
• High performance
• high signal-to-noise ratio
• low distortion
PINNING PIN V ALUE
1. Output A (Voltage swing) : Min : 0.75V, Max : 4.25V
2. Inverting input A : Vo(clip) : Min : 1400mVrms
3. Non-inverting input A : 2.5V
4. Ground : 0V
5. Non-inverting input B : 2.5V
6. Inverting input B : Vo(clip) : Min : 1400mVrms
7. Output B (Voltage swing) : Min : 0.75V, Max : 4.25V
8. Positive supply : 5V, Min : 3.0V, Max : 7.0V
Saw filter’s list:
PAL BG
PS BG DK
PAL I I'
MONO
PS BG DK K' I I'
PS BG DK K' L L'
PAL BG
PAL I I'
PS BG DK K' I I'
STR
PS BG DK K' L L'
PINNING
1. Input
2. Input-ground
3. Chip carrier-ground
4. Output
5. Output
K9656M, L9653M
PINNING
1. Input
2. Switching Input
3. Chip carrier-ground
4. Output
5. Output
VIDEO AUDIO
G1975M
K2966M
J1981
K2966M
K2962M L9653
VIDEO AUDIO
G3963M G9353M
K3958M K9356
K3958M K9356
K3958M K9656
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CIRCUIT DESCIRIPTION
POWER SUPPLY
The ZX series of receivers incorporate a Motorola switch mode power supply using a MC 44608 regulator controller IC.
The circuit provides power to the receiver in both standby and. normal operation modes.
START UP
The switch on the mains supply is fed through the mains filter network TR801, the surge limiter resistor R828,the bridge
rectifier diodes D811/13/37/38, and reservoir capacitor producing approx. 320 volts D.C to feed the switching MOSFET
Q801 via the primary winding of TR802 pins 6 and 7.
Start up resistor R801 feeds from a 500V coming from the mains through the adder diodes D809, D890 to pin 8 of IC800, the
IC uses 9mA current source and connects it internally to VCC at pin6 allowing a rapid charge enough for start up. ThenIC800
responds with the oscillator starting to oscillate at a 40khz frequency fixed by the IC manufacturer.
The IC then produces, pulse width modulation pulses, at this frequency on pin 5 to drive the base of the switching FET
Q801, that will then switch current on and off through the primary of TR802, which will in turn provides voltages in the
secondary windings. The secondary winding voltages being proportional to the length of time that Q801 is turned on in each
cycle. The voltage produced between pins 4 and 3 of TR802 is rectified by D804 developing aprox. 12 volts on C810, which
takes over from the start up resistor to supply pin 8 of IC800.
The Demag pin at pin1 offers 3 different functions: Zero voltage crossing detection (50mV), 24mA current detection and
120mA current detection. The 24mA level is used to detect the secondary reconfiguration status and the 120mA level to
detect an Over Voltage status called Quick OVP.
The VCC at pin6 operates between 6,6V and 13V in normal operation, when this voltage exceeds 15V then the IC output is
disabled.
VOLTAGE REGULATION
After initial start up the secondary voltages of TR802 are established. These voltages then need to be regulated to the
required levels. In a switch mode power supply such as this, it is the ON time of the switching FET Q801 that determines
the output voltages produced. To provide regulation of the supply there is a feedback loop via an adjustable zener IC118 and
an OPTO- coupler connected to pin3 of IC800. The reference voltage of IC118 is set to 2,5V to supply a B+ voltage of 115V.
Any fluctuation at this pin will cause IC800 to compensate it either by increasing or decreasing the voltage at the secondary
outputs.
VOLTAGE PROTECTION
The MC44608 offers two OVP functions:
1- A fixed function that detects when V CC is higher than 15.4V
2- A programmable function that uses the demag pin. The current flowing into the demag pin is mirrored and compared to
the reference current Iovp (120mA). -Thus this OVP is quicker than normal number one as it directly sense the change in
current rather than waiting for a specific voltage value, and is called QOVP. In both cases, once an OVP condition is
detected, the output is latched off until a new circuit START–UP.
3- A software controlled function acts on pin52 of IC501. This pin monitors feedback from both 8V and 5V via D512, then
compares these to a reference value Vref pre-set by the hardware through resistors R545, R546, R548. In normal mode
operation 1.2V < Vref < 2.4V. Any voltage outside this window will cause the micro controller to force the TV to stand by
mode by lowering the standby port. Refer to standby mode.
CURRENT PROTECTION
To monitor the current drawn by the receiver the source of Q801 is returned to the bridge rectifier through a low value
resistor R807. All the current drawn by the receiver will flow through that resistor each time Q801 conducts, this will produce
a voltage across the resistors proportional to the current drawn by the receiver. This voltage is fed to pin 2 of IC800 via
R806.When the receiver is working normally the voltage across R807 is only a fraction of a volt and is not large enough to
have any effect on IC800. Under fault conditions, if the receiver draws excessive current the voltage across R807 will rise.
This voltage is monitored by the current sense input pin2.
This Current Sense pin senses the voltage developed on the series resistor R806 inserted in the source of the power
MOSFET. When I sense reaches 1V, the Driver output (pin 5) is disabled. This is known as the Over Current Protection
function. A 200mA current source is flowing out of the pin 3 during the start–up phase and during the switching phase in
case of the Pulsed Mode of operation. A resistor can be inserted between the sense resistor and the pin 3, thus a
programmable peak current detection can be performed during the SMPS stand–by mode.
SAFETY PRECAUTIONS
Remember that all the primary side components of the power supply shown to the left of TR8O2 on the diagram are live
to earth. It is recommended that a mains isolation transformer is used when servicing the receiver.
Many of the components in the power supply are safety critical. (R828, R809) is a surge-Iimiting resistor, limiting the
surge through the degauss coils when the reservoir capacitor is empty. These are marked with an exclamation mark in
a triangle on the circuit diagram. These components MUST be replaced only with parts of identical value and safety
characteristics. For reliability, it is recommended that only genuine parts are used for service replacements.
Always check the main supply voltage feeding the line output stage after replacing parts in the power supply or line
output circuit. The correct voltage is important for safety and reliability, the correct voltage should be 115 V ±2 V.
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