Akira 21WHS3 Bedienungsanleitung

Model No: 21WHS3-Bn

Version 1.0

C-

-T

Model No: 21WHS3-Bn

Version 1.0

CONTENTS

SAFETY NOTICE ................................................................................................................................... 4

GENERAL DESCRIPTION .................................................................................................................... 6

TECHNICAL SPECIFICATION ............................................................................................................. 7

GENERAL SPECIFICATION................................................................................................................. 8

SAFETY CAUTIONS FOR PRODUCTS ............................................................................................... 9

ADJUSTMENT MODE ......................................................................................................................... 10

CHASSIS BLOCK DIAGRAM ............................................................................................................. 15

FAULT FINDING TREES..................................................................................................................... 16

IC BLOCK DIAGRAM ......................................................................................................................... 23

MAIN CHIP INSTRUCTION................................................................................................................ 24

FACTORY MENU ................................................................................................................................ 45

EXPLODED VIEW AND PART NAME .............................................................................................. 48

BOM LIST ............................................................................................................................................. 49

CIRCUIT DIAGRAM............................................................................................................................ 58

Model No: 21WHS3-Bn

Version 1.0

SAFETY NOTICE

WARNING: BEFORE EXAMINING AND

SERVICING THIS CHASSIS, READ

CAREFULLY THE FOLLOWING

SAFETY INSTRUCTIONS.

X-RAY RADIATION PRECAUTION

1. The primary source of X-RADIATION in television receiver is the picture tube. The picture

tube is specially constructed to limit X-RADIATION emissions. For continued X-RADIATION

protection, the replacement tube must be the same type as the original including suffix letter.

Excessive high voltage may produce potentially hazardous X-RADIATION. To avoid such

hazards, the high voltage must be maintained within specified limit. Refer to this service manual,

high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits,

take necessary corrective action. Carefully follow the instructions for +B1 volt power supply

adjustment, and high voltage check to maintain the high voltage within the specified limits.

2. The EHT must be checked every time the receiver is serviced to ensure that the CRT does not

emit X-ray radiation as result of excessive EHT voltage. The nominal EHT for this receiver is

22KV at zero beam current (minimum brightness) operating at AC 220V. The maximum EHT

voltage permissible in any operating circumstances must not exceed 25KV. When checking the

EHT, use the High Voltage Check procedure in this manual using an accurate EHT voltmeter.

3. The only source of X-RAY radiation in this receiver is the CRT. To prevent X-ray radiation,

you should use the same type of CRT when replacing it.

4. Some components used in this receiver have safety-related characteristics preventing the CRT

from emitting X-ray radiation. For continued safety, replacement component should only be made

after referring the Product Safety notice below.

SAFETY PRECAUTION

1. The high voltage in the TV reaches to 22KV when the TV is in operation. Be more careful

during opening the back cover.

a. The high voltage existing in the TV is very dangerous. Refer servicing to qualified

personnel only.

b. Before removing the high voltage cap. Discharge the anode of the CRT and the

chassis in case of electric shock.

c. Wear a pair of goggles when handling the CRT to avoid broken pieces damaging

your eyes.

d. Do not hold the CRT neck in case of causing damage to the CRT.

2. When the power cord needs replacing, use the same one as that provided by AKIRA factory.

3. Voltage exists between the hot and cold ground when TV is in operation. Install a separation

transformer during repairing or connecting to any tester for the sake of safety. The power of

the separation transformer should be beyond rated overall power.

Model No: 21WHS3-Bn

Version 1.0

4. When replacing a burnout fuse, use the one with the same specifications as the original.

5. When replacing old wire, wind new one round the shaft to weld. When replacing components

with safety in performance, use the same type as that specified by AKIRA and install it in the

former way.

6. Never place wire near high-temperature or high-voltage components.

7. An isolation transformer should be connected in the power line between the receiver and the

AC line when a service is performed on the primary of the converter transformer of the set.

8. Comply with all caution and safety-related notes provided on the cabinet back, inside the

cabinet, on the chassis or the picture tube.

9. When replacing a chassis in the cabinet, always be certain that all the protective devices are

installed properly, such as, control knobs, adjustment covers or shields, barriers, isolation

resistor-capacitor networks etc.. Before returning any television to the customer, the service

technician must be sure that it is completely safe to operate without danger of electrical shock.

PRODUCT SAFETY NOTICE

Product safety should be considered when a component replacement is made in any area of a receiver.

Components indicated by mark in the parts list and the schematic diagram designate components in

which safety can be of special significance. It is particularly recommended that only parts designated

on the parts list in this manual be used for component replacement designated by mark. No deviations

from resistance wattage or voltage ratings may be made for replacement items designated by mark.

Model No: 21WHS3-Bn

Version 1.0

GENERAL DESCRIPTION

AKPH02 chassis series are applied in A14P01/A21P01 respectively which uses

mainly Philips’ advanced UOC-ultimate chip TDA935X/6X/8X and I2C-bus

controlled IC. With combination of microcontroller and small signal processor, the

TDA935X/6X/8X series feature high-integration, high-performance-to-price ratio and

high-reliability and advanced functions with fewer external components, which

provide much convenience for manufacturing and technical service.

Table 1 provides A14P01/A21P01 mainly ICs and functions.

THE SURVEY

Table 1, the main IC and functions

Position Type Function Description

N301 TDA9361/TDA9381 Microcontroller and small signal

processor(UOC)

N702 ST24C08-W EEPROM

N701 AN7522N Sound power amplifier

N401 LA78040 Vertical scan output stage circuit

N801 LC4052B/CD4052BE AV1/AV2 Switch

N121 LC4052B/CD4052BE AV1/AV2 Switch

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: 21WHS3-Bn

Version 1.0

TECHNICAL SPECIFICATION

Test Item Conditional TD171

AC Operating

Range

RF&AV signal input with sound loud speaker

(volume maximum) & Picture set in Dynamic

mode

140Vac ~ 240Vac

Philips or Mono-scope pattern signal with howling

sound Contrast & Brightness set in Maximum,

sound increase maximum

90Watts

Total Power

Consumption

Standby Mode 14 Watts

Brightness & contrast set in Maximum Min: 26.2KVdc

Typical Design value Average: 26.5KVdc

EHT

Brightness &contrast Minimum Max: 27.8KVdc

Anode Current Brightness &contrast Maximum IABL ≤1.2mA

Heater Voltage TV operate normally V Heater = 6.2Vac

B+Normal operating VB+= 112Vdc

Sound power

output

RF signal input broadcasting at

217.25MHz/BG/DK(1KHz)

Volume is maximum

V = 6.3Vrms

P = 5Watts X 2

Model No: 21WHS3-Bn

Version 1.0

GENERAL SPECIFICATION

14” 70W MAX

Power consumption 21” 90W MAX

Receive system DK/BG/I

Color system PAL/ SECAM/ NTSC

Vision intermediate

frequency 38.9MHz

5.5 MHz(B/G)

Inter-carrier frequency 6.5MHz(D/K)

Chroma if frequency PAL 34.47/ 35.32MHz

Antenna type DIN TYPE 75 Ohm

VHF Low channel

(VL)

=48.25 to 147.25 MHz

VHF high channel

(VH)

=154.25 to 463.25 MHz

Channel receiving

UHF channel (U) =471.25 to 863.25 MHz

Tuning system VS tuning

AV IN/ OUT 2 AV STEREO IN + 1 AV STEREO OUT

Component IN 1 YUV-Component IN

VIDEO IN ----1.0 0.2Vp-p 75 Ohm

AUDIO IN ----0-2V (RMS)

VIDEO OUT ----1.0 0.2Vp-p 75 Ohm

AV IN/ OUT specification

AUDIO OUT ---- 0-2V (RMS)

OSD language English, Russian, Turkish, French, Spanish, Vietnamese,

Indonesian, Arabian, Persian

Audio output power > 8W (1KHz, 0.5V INPUT, 10% THD

Safety authentication

standard CB

LED indicator Power ON

Hand set type HS08

Hans set power supply Pin AAx2

Color picture tube 14” 21” 90 degree tube

Remote control distance 5m

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: 21WHS3-Bn

Version 1.0

SAFETY CAUTIONS FOR PRODUCTS

Many electric and mechanical components in AKPH01 chassis have special safety performances,

which are always neglected. Even if replacing them with some components with the same voltage and

power, you can not get effective protection to X-ray. In the circuit diagram, these special electric

components are indicated by the special mark ! and on the shadow. When replacing any of them, use

the one with the same specifications as the original’s. Otherwise, it may cause X-ray radiation and

damage to overall safety.

CIRCUIT ADJUSTMENTS

GENERAL INFORMATIONS

All adjustment are thoroughly checked and corrected when the receiver leaves the

factory. Therefore the receiver should operate normally and produce proper color and

B/W pictures upon installation. However, several minor adjustments may be required

depending on the particular location in which the receiver is operated.

This receiver is shipped completely in carton. Carefully draw out the receiver from

the carton and remove all packing materials. Power cord into a convenient 220 volts

50 Hz AC two pin power outlet. Turn the receiver ON. Check and adjust all the

customer controls such as BRIGHTNESS, CONTRAST and COLOUR Controls to

obtain natural color or B/W picture.

AUTOMATIC DEGAUSSING

A degaussing coil is mounted around the picture tube so that external degaussing after

moving the receiver is normally unnecessary, providing the receiver is properly

degaussed upon installation. The degaussing coil operates for about 1 second after the

power to the receiver is switched ON. If the set is moved or faced in a different

direction, the power switch must be switched off at least 30 minutes in order that the

automatic degaussing circuit operates properly. Should the chassis or parts of the

cabinet become magnetized to cause poor color purity, use an external-degaussing

coil. Slowly move the degaussing coil around the faceplate of the picture tube, the

side and front of the receiver and slowly withdraw the coil to a distance of about 2m

before disconnecting it from AC source. If color shading still persists, perform the

COLOUR PURITY ADJUSTMENT and CONVERGENCE ADJUSTMENTS

procedures.

Model No: 21WHS3-Bn

Version 1.0

ADJUSTMENT MODE

Item B+ adjustment, TV signal receiving

AKPH01 chassis

Measuring

Equipment

TV SG (Signal Generator)

Digital multi-meter

Preparation

Before Adj.

The set is turned on

Connect the TV SG to RF input terminal of the set.

Adjustment procedure

1, Turn VR501 potentiometer to adjust B+ to specified voltage.

2, Check voltages for video out, vertical out, circuit work and audio

power out as follow

Voltage (volt)

14 inch 21 inch Tolerance

+B 110 110

±2V

Video Out 188 188 ±5V

Vertical Out 26 26 ±1V

Circuit Work 13 13 ±1V

Audio Power Out 12 12 ±1V

3, TV signal receiving

1. Press MENU key, to select POS.MEMORY item.

Press V+ or V- key, to select SEARCH or AUTOMEMORY

item, press P+ key to start searching.

2. Press P+ or P- key to inspect the set if there is channel skipped,

if so, searching again by SEARCH as above described.

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