Akira 21BHS3/CE Manuel utilisateur

Model No: 21BHS3CE

Version 1.0

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Model No: 21BHS3CE

Version 1.0

CONTENT

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

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

SIGNAL PROCESS ................................................................................................................................. 6

HORIZONTAL AND VERTICAL CIRCUIT ......................................................................................... 7

IC ILLUSTRATION ................................................................................................................................ 8

FACTORY MENU................................................................................................................................. 15

CIRCUIT DIAGRAM............................................................................................................................ 19

EXPLODED VIEW AND PART NAME .............................................................................................. 20

BOM LIST ............................................................................................................................................. 21

Model No: 21BHS3CE

Version 1.0

SPECIFICATION

Rated Voltage AC 140V~250V 50Hz/60Hz

Sound output: 5W×2

Screen size Picture tube 54cm

RF PAL

Color AV NTSC

System:

Sound 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 38.9 MHz

Video/Audio (L/R) 2set input

YUV input

S-Video input

External input/output

Video/ Audio (L/R) 1 set output

 I2C Bus Control

 Auto Search

 Off/On Timer

 Teletext

Model No: 21BHS3CE

Version 1.0

THE SURVEY

Table 1, the main IC and functions

Number Function IC Remark

1 Power supply KA5Q0765RT N611

2 CPU + SIGNAL PROCESSER OM 8370 /TDA9370 N301

3 Field driver STV9302A N401

4 Sound driver AN7522N N161

5 AV SWITCH TC4052BP N801 (Video)

N121 (sound)

6 Memory AT24C08 N702

7 Photo-coupler HS817B N504

8 IR-receiver HS0038A N1503

9 8V regulator L7808CV N503

10 5V regulator L7805CV N505

Model No: 21BHS3CE

Version 1.0

SIGNAL PROCESS

The TV signal enters into tuner (A201) from cable or antenna. Pin 10 and pin 11 of N301 are combined

to select the band. Pin 4 of N301 outputs PWM tuning signal. The 38.9MHz IF signal is coupled to

V308 (pre-amplify) and then to SAWF (Z301). After processed in the SAWF, the 38.9MHz signal gets

to pin 23 and pin 24 of OM8370. The IF circuit in OM8370 includes such unit as the AGC amplifying

circuit, 38.9MHz oscillator, PLL video demodulator, video amplifier, IF identify circuit and AFT

circuit. The demodulated signal (CVBS) comes from the pin 38 of OM8370, the sound signal comes

from the pin 44.

The internal CVBS signal needs norm identification then outputs from pin 38 of OM8370, via the trap

circuit (composed of the V351, Z351, Z354, V352 and so on) feeds back to the pin 40 of OM8370. The

RGB signal comes from pin51, Pin52, Pin53 of OM8370, and outputs to the CRT board. The internal

sound signal comes from pin 44 of OM8370 and then input to pin 1 and pin 12 of HEF4052BP. The

sound signals from RF and AV are selected in it. The selected signal is output from Pin 3 and pin13,

then input AN7522N (sound amplifier) or output from AV terminals.

Model No: 21BHS3CE

Version 1.0

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 pin 33 is transferred

to the horizontal-drive transistor.

The cathode driving voltage 180V vertical drive voltage +15V and –15V are all generated from

FBT.

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

amplifier STV9302A. STV9302A is a 7 pins vertical deflection circuit (2 Amperes) for DC-coupled

90° or 110° deflection systems with frame frequencies from 50 up to 120 Hz. one supply voltage for

the scanning and second voltage supply for the flyback are needed.

The vertical drive currents of OM8370 pins 21 and 22 are connected to input pins 1 and 7 of

STV9302A. The vertical scanning output is coming from pin 5 and feed back to pin 1 by R405. The

supply voltage is ±15V at pin 2 and pin 4. C406 is the pump capacitor.

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, +5V and +3.3V by the special generators.

Model No: 21BHS3CE

Version 1.0

IC ILLUSTRATION

Fig 1 OM 8370 illustration

Model No: 21BHS3CE

Version 1.0

Pin 1 Standby control, “1” is on, “0” is off.

Pin 2 SCL

Pin 3 SDA

Pin 4 Tuning PWM output

Pin 5 Auto AV control SW, connected with the SCART 8th pin. Input. The rising edge or

the falling edge operates.

Pin 6 Key board input.

Pin 7 Volume

Pin 8 Mute control, “1” is mute, “0” is off.

Pin 9, Pin 12,

Pin 18, Pin 30,

Pin 35, Pin 41,

Pin 55

GND

Pin 10 BAND 1 control output.

Pin 11 BAND 2

Pin 13 SECAM PLL, connected with a capacitance (no use in this type).

Pin 14 +8V power source supply

Pin 15 Using a capacitor of 220n in series to GND. This pin decouples the internal digital

supply voltage of the video process and minimizes the disturbance to the sensitive

analogue parts.

Pin 16 Phase-2 control loop, this pin requires a capacitor at 2.2nF © in series to GND.

Pin 17 Phase-1 control 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 Phase-1 output current.

Pin 18 GND

Pin 19 Bandgap decoupling, the bandgap circuit provides a very stable and temperature

independent reference voltage. This reference voltage (4.0V) ensures optimal

performance of the analogue video processor part of the OM8370 and is used in

almost all functional circuit blocks.

Pin 20 East-west pillow signal output.

Pin 21, Pin 22 Vertical drive output.

Pin 23, Pin 24 IF input.

Pin 25 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.

Pin 26 Vertical sawtooth. This pin requires a capacitor to ground of 100nF.

Pin 27 AGC output. This output is used to control (reduce) the tuner gain for strong RF

signals.

Pin 28 Audio de-emphasis.

Pin 29 Sound decoupling. This pin requires a capacitor connected to ground. The pin acts

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

Pin 30 GND

Pin 31 Sound loop filter.

Pin 32 AVL filter

Pin 33 Horizontal drive signal output, needs a resistor in series to +8V.

Pin 34 Sandcastle output /flyback input.

Pin 35 External audio input, this pin should be grounded in this chassis.

Model No: 21BHS3CE

Version 1.0

Pin 36 EHT tracking /over voltage protection. If something is wrong, the anode high

voltage rise 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 OM8370 will

stop working.

Pin 37 PLL loop filter.

Pin 38 CVBS output. Monitor or RF videos can be selected.

Pin 39 +8V supply source

Pin 40 CVBS input

Pin 42 Y signal input

Pin 43 C signal input

Pin 44 Main audio output. This pin is connected to the TDA9859.

Pin 45 RGB signal input blanking.

Pin 46, Pin 47,

Pin 48

RGB signal input.

Pin 49 ABL. It means been current limiter input. R410 is the control resistor.

Pin 50 Black current input from the CRT board.

Pin 51, Pin 52,

Pin 53

RGB drive signal output to the CRT board.

Pin 54 +3.3V

Pin 55 GND

Pin 56 +3.3V

Pin 57, Pin 58,

Pin 59

12MHz crystal

Pin 60 Reset. NC in this chassis

Pin 61 +3.3V

Pin 62 NC

Pin 63 This pin is connected to the HEF4094. Functions expending.

Pin 64 IR signal input.

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