Akira 21WHS3 Manuel utilisateur

Model No: 21WHS3BN

Version 1.0

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Model No: 21WHS3BN

Version 1.0

CONTENT

SPECIFICATION .................................................................................................................................... 4

THE SURVEY ......................................................................................................................................... 5

THE MAIN CHIPS INSTRUCTION....................................................................................................... 6

SIGNAL PROCESS ................................................................................................................................. 8

THE HORIZONTAL AND VERTICAL CIRCUIT ................................................................................ 9

FACTORY MENU................................................................................................................................. 11

APPENDIX ............................................................................................................................................ 14

CIRCUIT DIAGRAM............................................................................................................................ 18

EXPLODED VIEW WITH PART NAME ............................................................................................ 19

Model No: 21WHS3BN

Version 1.0

SPECIFICATION

Rated Voltage AC 110V~250V 50Hz/60Hz

Power Consumption 65W

Sound output: 3W×2

Screen size Picture tube 21 inch

RF PAL SECAM

Color AV NTSC

System:

Sound D.K / B.G

VHF Low channel (VL) =48.25 to 147.25 MHz

VHF high channel (VH) =154.25 to 463.25 MHz

Channel coverage:

UHF channel (U) =471.25 to 863.25 MHz

IF 38MHz

Video/Audio (L/R) 1set input at side

YUV & SVHS at rear

External input/output

AV output at rear

 I2C Bus Control

 Auto Search

 Off/On Timer

 Teletext

Model No: 21WHS3BN

Version 1.0

THE SURVEY

Table 1, the main IC and functions

Number Function IC Remark

1 Power supply KA5Q0765RT N501

2 CPU + SIGNAL PROCESSER TDA9381 N301

3 Field driver LA78040 STV9302A N401

4 Sound processor TDA9859 N122

5 Sound driver AN7522N(stereo) N161

6 AV SWITCH TC4052BP N801 (Video)

7 5V Regulator L7805CV N505

8 8V Regulator L7808CV N503

9 Memory AT24C08 N702

10 Photo-coupler HS817B N504

11 IR-receiver HS0038A U701

Model No: 21WHS3BN

Version 1.0

THE MAIN CHIPS INSTRUCTION

The UOC (“Ultimate One Chip”) TDA9381/61 is adopted in this chassis. This IC is the first available

component that contains the complete control and small signal functionality needed for a TV

application in one device.

1. The UOC TDA9361/81 pins function description：（）

total 64 pins

Pin1: Standby control,“1” is on,“0”is off.

Pin2: SCL.

Pin3: SDA.

Pin4: Tuning PWM output.

Pin5: NTSC SWITCH.

Pin6: Key board input.

Pin7: VOL1, controls the 9 pin of the N101 and supplies DC voltage.

Pin8: Mute control,“1” is mute,“0”is off.

Pin9, Pin12,Pin18,

Pin30, Pin35, Pin41,

Pin55:

GND.

Pin10 & Pin11: Band control of the tuner, the two pins needs the pull-up resistance.

Pin13: SECAM PLL, connected with a capacitor.

Pin14: +8V power source supply.

Pin15: Using a capacitor of 220n in series to GND, This pin decouples the internal

digital supply voltage of the video processor and minimizes the disturbance to

the sensitive analogue parts.

Pin16: PHI-2 control loop, this pin requires a capacitor at 2.2nF (C) in series to GND.

Pin17: PHI-1 control loop, the loop filter connected to pin 17 is suitable for various

signal conditions like strong/weak and VCR signal. This is achieved by

switching of the loop filter time constant by changing the PHI-1 output

current.

Pin18: GND

Pin19: Bandgap decoupling, the bandgap circuit provides a very stable and

temperature independent reference voltage. This reference voltage (4.0 V)

ensures optimal performance of the analogue video processor part of the

TDA9381 and is used in almost all functional circuit blocks.

Pin20: AVL filter, according to the different soft edition.

Pin21, Pin22: Vertical drive output.

Pin23, Pin24: IF input.

Pin25: Reference current, This pin requires a resistor to ground. The optimal

reference current is 100mA which is determined by this resistor. The 100mA

reference current should not be changed because the geometry processor is

optimized for this current. Furthermore the output current of vertical drive and

EW are proportional to this current.

Pin26: Vertical saw tooth, This pin requires a capacitor to ground of 100nF.

Pin27: AGC output. This output is used to control (reduce) the tuner gain for strong

RF signals.

Pin28: Audio de-emphasis.

Pin29: Sound decoupling. This pin requires a capacitor connected to ground. The pin

acts as a low pass filter needed for the DC feedback loop.

Model No: 21WHS3BN

Version 1.0

Pin30: GND.

Pin31: Sound loop filter.

Pin32: AVL filter, according to the different soft edition.

Pin33: Horizontal drive signal output, needs a resistance in series to +8V.

Pin34: Sandcastle output/flyback input.

Pin35: External audio input, this pin is no use.

Pin36:

EHT tracking/ over voltage protection. If something is wrong, the anode high

voltage rises, the heater voltage will rise too. When the rising voltage arrive

some limit, the V406 works, the voltage of pin 36 will exceed 3.9V, the

TDA9381 will stop working.

Pin37: PLL loop filter.

Pin38: CVBS output. Monitor or RF videos can be selected.

Pin39: +8V supply source.

Pin40: CVBS input

Pin42: Y signal input.

Pin43: C signal input.

Pin44: Main audio output, this pin is connected to the TDA9859.

Pin45: YUV signal input control voltage, 0 = Pin 45 low (< 0.4V), no insertion,

1 = Pin 45 above insertion level (>0.9V), YUVIN inserted.

Pin46, Pin47,

Pin48: YUV signal input.

Pin49: ABL. It means beam current limiter input. The R462 & R463 are the control

resistances.

Pin50: Black current input from the CRT board.

Pin51, Pin52,

Pin53: RGB drive signal output to the CRT board.

Pin54: +3.3V.

Pin55: GND.

Pin56: +3.3V.

Pin57, Pin58,

Pin59: 12MHz crystal.

Pin60: Reset, NC in this chassis.

Pin61: +3.3V

Pin62 & Pin63: The AV control pins.

Pin64: IR signal input.

2. Memory AT24C08 is an E2PROM of 8k, pins describe as follows:

Pin1, Pin2, Pin3,

Pin4, Pin7: GND.

Pin8: +5V-1 supply.

Pin5: SDA.

Pin6: SCL.

Model No: 21WHS3BN

Version 1.0

SIGNAL PROCESS

The main chip is N301 TDA9381, AV control switch HEF4052 (video), sound process chip is

TDA9859 (AV audio), sound driver is N601 AN7522N.

The TV signal inputs into the tuner (A201) from CABLE or antenna. The pin 10 and pin 11 of the

N301 are combined to select the band. The pin 4 of the N301 outputs the PWM tuning signal. The IF

video signal comes from the IF pin of the tuner. The 38MHz IF signal is coupled to the V308 (pre-

amplify) and then to SAWF (Z301). After processed in the SAWF, the 38MHz signal gets to the pin 23

and pin 24 of TDA9381. The IF circuit in TDA9381 includes such unit as the AGC amplifying circuit,

38MHz oscillator, PLL video demodulator, video amplifier, IF identify circuit and AFT circuit. The

demodulated signal (CVBS) comes from the pin 38 of TDA9381, the sound signal comes from the pin

44.

The internal CVBS signal needs norm identification then outputs from the pin 38 of TDA9381, via the

trap-wave circuit (composed of the V351, Z351, Z352 and so on) feeds back to the pin 40 of TDA9381.

The RGB signal comes from the pin51, Pin52, Pin53 of TDA9381, and outputs to the CRT board.

The V911, V921 and V931 are the R、、

G B drive transistors. The V912, V913, V922, V923, V932,

V933 are the auto low bright balance level output circuit, and generate the low bright level current into

the pin 50 of TDA9381.

The internal sound signal comes from the pin 44 of TDA9381, via the coupling capacitor C367

connects to the pin 3 and 5 of TDA9859. The TDA9859 is the audio effect processor, the AN7522N is

the driver. The TDA9859 includes bass, treble, balance, surround, effect shortcut options, additional

the audio input switch.

Model No: 21WHS3BN

Version 1.0

THE HORIZONTAL AND VERTICAL CIRCUIT

Through Synchronous separating circuit, the video signal is divided into horizontal-Synchronizing

signal and Vertical-Synchronizing signal. The horizontal-Sync pulse coming from the pin 33 is

transferred to the horizontal-drive transistor, and will be used to drive the horizontal-transformer. The

horizontal-switch transistor is V451, it and the +B supply drives the flyback transformer to generate

the anode high voltage, the focus voltage, the screen voltage, the CRT board drive voltage 190V, the

vertical drive voltage 15V and -15V.

The vertical sawtooth wave is generated on the pin 21 and 22, and then enters the vertical output

amplifier circuit. The vertical output amplifier circuit is realized with the power amplifier IC –

LA78040 or STV9302A.

The STV9302A is a 7 pins vertical deflection circuit (3 Amperes) for DC-coupled 90° deflection

systems with frame frequencies of 50 or 60 Hz. Two single supply voltages for the scan and two

supplies for the flyback are needed.

The vertical drive currents of TDA9381 pins 21 and 22 are connected to input pins 1 and 7 of the

STV9302A. Pin 2 is the +15V DC power supply voltage, Pin 4 is the -15V DC power supply voltage.

The outputs (pin5) is connected to the series connection of the vertical deflection coil and feedback

resistor R406. The voltage across R406 is fed via pin 1 to obtain a deflection current which is

proportional to the drive voltage.

Model No: 21WHS3BN

Version 1.0

Power supply

The IC of KA5Q0765RT is adapted in this chassis; it is the product of Fairchild. It supplies four DC

voltages, one is the +B＝

110V, another is Hcc＝

26V, the third is 13V (the sound drive voltage), the

fourth is +16V. The +16V can generate the +8V. The fifth is +12V, it generate the +5V and +3.3V by

the special generators.

Fig.1 The power supplies illustration

L501

L503

VD503

VD504

VD505

VD506

C507

501

T501

504

VD543

VD522

+13V To N101

+26V To V450, T450

+12V To N505

VD47

VD470

+190V To CRT

+15V To Pin 2 of N401

-15V To Pin 4 of N401

+5V

R561

VD564

Pin 1 of N301 is high level V504 is ON

+3.3V To

+8V

VD524

R480

HEARTER VOLTAGE

+12 V542 N503

AC 22V DC VD52

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