Service manual color Television Receiver icon

Service manual color Television Receiver



НазваниеService manual color Television Receiver
Дата конвертации15.09.2012
Размер58.76 Kb.
ТипДокументы
1. /El_cx_14_21.pdf
2. /axt_axt1_service_manual.doc
Service manual color Television Receiver



SERVICE MANUAL


Color Television Receiver


Model: -CX series

-AX series

-AXT series

-AXT1 series

-EXT1 series


SPECIFICATION


System PAL ,SECAM D/K, B/G ( -AX series)

PAL D/K , B/G , I (-CX series)

PAL ,SECAM D/K ,B/G , I (-AXT,-AXT1 –EXT1 series)

AV NTSC 4.43/3.58MHz


Channel VHF LOW 48~91.75 MHz

VHF HIGH 168.25~222.75MHz

UHF 471.25~869.75 MHz


Scanning Line 625/525 Line

Horizontal Frequency 15625/15750 Hz

Vertical 50/60 Hz


IF Frequency Video 38MHz

Sound 31.5/32/32.5 MHz

Chroma 33.57 MHz


Sensitivity VHF LOW 43 dBμV

VHF HIGH 45 dBμV

UHF 45 dBμV


Audio Output Power 7% THD 2W (14"~21" series)

4W + 4W (29" series)


Antenna Impedance 75Ω


Power Consumption 60W (14" series)

75W (21" series)

180W (29" series)


Power Supply AC 110/220/240V 50/60Hz


IMPORTANT SERVICE SAFETY INFORMATION


Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on these models should only be performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment.

Exercise care when servicing this chassis with power applied. Many B plus and high voltage RF terminals are exposed which, if carelessly contacted, can cause serious shock or result in damage to the chassis. Maintain interconnecting ground lead connections between chassis, escutcheon, picture tube dag and tuner when operating chassis.

These receivers have a "polarized" AC line cord. The AC plug is designed to fit into standard AC outlets in one direction only. The wide blade connects to the 'ground side' and the narrow blade connects to the 'hot side' of the AC line. This assures that the TV receiver is properly grounded to the house wiring. If an extension cord must be used, make sure it is of the 'polarized' type.

Since the chassis of this receive is connected to one side of the AC supply during operation, service should not be attempted by anyone not familiar with the precautions necessary when working on these types of equipment.

When it is necessary to make measurements or tests with AC power applied to the receiver chassis, an Isolation Transformer must be used as a safety precaution and to prevent possible damage to transistors.
The Isolation Transformer should be connected between the TV line cord plug and the AC power outlet.

Certain HV failures can increase X-ray radiation. Receivers should not be operated with HV levels exceeding the specified rating for their chassis type. The maximum operating HV specified for the chassis used in these receivers is 23.5kV±1.0kV at zero beam current with a liner voltage of 120V AC. Higher voltage may also increase the possibility of failure in the HV supply.

It is important to maintain specified values of all components in the horizontal and high voltage circuits and anywhere else in the received that could cause a rise in high voltage, or operating supply voltages. No changes should be made to the original design of the receiver.

Components shown in the shaded areas on the schematic diagram and/or identified by in the replacement parts list should be replaced only with exact factory recommended replacement parts. The use of unauthorized substitute parts man creates may create shock, fire, X-ray radiation, or other hazards.

To determine the presence of high voltage, use accurate high impedance HV meter connected between the second anode lead and the CRT dag grounding device. When servicing the High Voltage System remove static charges from it by connecting a 10K Ohm resistor in series with an insulated wire (such as test probe) between the picture tube dag and 2nd anode lead (Have AC line cord disconnected from AC supply).

The picture tube used in this receiver employ integral implosion protection. Replace with a tube of the same type number for continued safety. Do not lift picture tube by the neck. Handle the picture tube only when wearing shatterproof goggles and after discharging the high voltage completely. Keep others without shatter proof goggles away.

Before returning the receiver to the user, perform the following safety checks:

1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the receiver.

2. Replace all protective devices such as non-metallic control knobs, insulating fishpapers, cabinet backs, adjustment and compartment covers of shields, isolation resistor-capacitor networks, mechanical insulators etc.

3. To be sure that not shock hazard exists, a check for the presence of leakage current should be made at each exposed metal part having a return path to the chassis (antenna, cabinet metal, screw heads knobs and/or shafts, escutcheon, etc.) in the following manner.

Plug the AC line cord directly into a 110V/220V/240V, AC receptacle. (Do not use an Isolation Transformer during these checks.) All checks must be repeated with the AC line cord plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the purpose of completing these checks.)

If available, measure current using an accurate leakage current tester. Any reading of 0.35mA or more is excessive and indicates a potential shock hazard, which must be corrected before returning the receiver to the owner.

If a reliable leakage current tester is not available, this alternate method of measurement should be used. Using two clip leads, connect a 1500 Ohm, 10 Watt resistor paralleled by a 0.15MF capacitor in series with a known earth ground, such as a water pipe or conduit and the metal part to be checked. Use a VTVM or VOM with 1000 Ohms per Volt, or higher, sensitivity to measure this AC voltage drop across the resistor. Any reading of 0.35 Volt RMS of more is excessive and indicates potential shock hazard which must be corrected before returning the receiver to the owner.


ALIGNMENT PROCEDURES

PLEASE READ BEFORE ATTEMPTING SERVICE

1. Use an Isolation Transformer when performing any service on this chassis.

2. Never disconnect any leads while receiver is in operation.

3. Disconnect all power before attempting any repairs.

4. Do not short any position of the circuit while the power is on.

5. For safety reasons, replace components any with identical replacement parts (SEE PARTS LIST).

6. Before alignment, warm up the TV for at least 30 minutes and demagnetize the CRT with an external degaussing coil.

7. When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position.

8. Inferior silicon grease can damage IC's and transistors. When replacing IC's and transistors, use only specified silicon grease. Remove all old silicon when applying new silicon.

9. Before removing the anode cap, discharge eletricity because it contains high voltage.


Service Flow Chart


Power supply

check input voltage ―→ check voltage of C901 anode ―→ check Pin 3 of N901 ―→ check V901 ―→ check output voltage of T901 secondary coil ―→check voltage of N903,N905 Pin 3(5.0v) and N904 Pin3 (8.0V) ―→check voltage of N601 Pin 9,13,42(2.5v) and Pin11,30,44 (3.3v) ―→ check voltage of N602 Pin 8 (+5V) ―→ check voltage of N301 Pin 12,53 (5.0V) and Pin17,45(8v)


Audio circuit

check power supply of audio power amplify circuit ―→ check input audio signal of audio power amplify circuit ―→ check waveform of N301 Pin 55


Horizontal circuit

Check voltage of T402 Pin 3 (14"~21" series is 108V~110V, 29" series is 130V~140V) ―→ check voltage of N301 Pin 45 (8.0V) ―→ check waveform of V401 Base ―→ check waveform of V402 Collector ―→ check output voltage of T402 coil ―→ check waveform of T402 Pin 8


Vertical circuit:

check voltage of N401 Pin 10 (14”,21”series) or N401 Pin6 (29’,34”series) (+24V~+27V) ―→ check voltage of N301 pin 45 (+8V) ―→ check waveform of N301 Pin 47 ―→ check waveform of N401 Pin 3 (14”,21” series) or Pin5 (29”,34” series) ―→ check waveform of N401 Pin 1 (14”,21” series) or Pin9 (29”,34” series).


MCU circuit:

check voltage of N601 Pin 9,13,42(2.5v) and Pin11,30,44 (3.3v) ―→ check waveform of N601 Pin 1,2 & Pin 3,4 ―→ check waveform of N601 Pin 19 & Pin 20 ―→ check waveform of N601 Pin 24.


ADJUSTMENT MANUAL



. TEST NOTE

1. Please follow the pointed test steps and choose the right test equipment to conduct adjustment, otherwise good effect of TV set could not be obtained. Pointed bias voltage value should be ensured during test to get satisfied test result.

2. To adjust MCU installed in the chassis, you should write master slice's data into memory of this MCU before installing, and no any data except this test manual listed is admitted to be modified without designer's agree.


. TEST EQUIPMENT

1. DC (14V)

2. Oscilloscope

3. Vacuum Voltmeter

4. Multi-meter (Internal resistance: DC≥20KΩ/V AC≥5KΩ/V)

5. High Voltage Meter 30KV

6. Ammeter (0.5 grade, DC 3mA)

7. Degaussing Coil

8. PHILIP Picture Signal Generator (PH5518)


. MANUAL OF FACTORY MODE MENU

1. Presses MENU button on the remote control once, and then press RECALL botton three times to enter FACTORY mode .

2.Presses MENU button select the different menu you want to adjust.

3. Press P+/P- buttons to select desired adjust item.

4. Presses V+/V- buttons to adjust selected item value.

5. Automatic adjust, yellow color shows adjustment is OK when automatic adjust ended.

6. Presses RECALL button again to exit FACTORY MODE.

7.Following is the main factory menu and their main function.

1).Factory 1 is white balance adjust menu.

Rc 128 Gc 128 Bc 128 Rd 32 Gd 32 Bd 32

2).factory 2 is multi adjust menu.

PIF-VCO 06 Use for PIF adjust

PIF-VCO-f 50 Use for PIF adjust

TUNER AGC 36 Use for tuner agc sdjust

H-shift 37 adjust H-center

V-size 42 14”,21” vertical size adjust

V-shift 10 no use

3).factory 3 is function setting menu,you don’t neet to adjust the value.Please check it as the same as bellow while produce.

14” 21” 29”, 34”

sound none none use bass(or no bass) sound function setting

Max-Snd-sys 03 03 03 the max sound if setting

Max-bright 39 50 50 the max brightness setting

Max-contr 49 63 63 the max contrast setting

Max-color 63 63 63 the max color setting

Max-sharp 12 12 12 the max sharpness setting

IF-38-45 38MHz 38MHz 38MHz PIF frequency setting

APR 00 00 00 automatic RGB peak regulation

Sub-bright 08 08 08 sub-brightness setting

Bell-Filter 00 00 00 bell-filter setting

Band-Ps-Shift 00 00 00 bell-filter setting

Bleck-stretch 02 02 02 bleck-stretch setting

Caculator YES YES YES caculator on/off setting

Remote control remctr 1 remctr 1 remctr 1 remote control setting

Audio out AV AV AV (for -AXT1,-AX series)

TV TV TV (for –AXT series) AV audio out setting

Av num 02 02 02 the max av-in numbers setting.


4).Factory 4 is teletext setting menu .The value is fixed ,you don’t need to change it.

Only use for –AXT ,-AXT1 , EXT1 series.

Primary 1 01 English

Primary 2 15 Russian 04 French

Primary 3 02 Swedish

Primary 4 07 Turkish

Primary 5 00 German

Primary 6 06 Spanish

Primary 7 03 Italian

Primary 8 18 Arabic

Secondary 1 01

Secondary 2 01 Russian 04 French

Secondary 3 02

Secondary 4 07

Secondary 5 00

Secondary 6 06

Secondary 7 03

Secondary 8 18

X26language 1 00

X26language 2 02 Russian 00 French

X26language 3 00

X26language 4 00

X26language 5 00

X26language 6 00

X26language 7 00

X26language 8 08


5).Factory 5 is H,V. Adjust menu . (Only use for 29”,34”)

Ver-size 42 vertical size setting

Ver-shift 21 vertical center setting

S-correct 05 for vertical S-correct setting

C-correct 15 for veertical C-correct setting

Hor-width 19 Hor. Size setting

E/W correct 10 E/W Correct setting

E/W corner 00 E/W corner setting

Tapezium 08 for tapezium setting


. POWER AND VOLTAGE ADJUSTMENT

1. Receive Television Broadcast Signal, adjust BRIGHTNESS & CONTRAST to get the standard picture.

2. Check if AC is normal (AC 130V--240V 50/60Hz).

3. Adjust RP901 util the voltage between VD904 cathode a chassis GND is standard voltage ±0.5V (standard voltage indicated in BOM).


V. PIF VCO ADJUSTMENT

1. Use PHILIP Picture Signal Generator (PH5518) input 38MHz signal (80dBu)to tuner IF out pin.

2. Enter factory2 menu and select PIFVCO menu ,press AV on remote controler to automaticly adjust the pifvco.The vco value will display on the screen after adjustment ended.


. RF AGC AUTOMATIC ADJUSTMENT

1. Receive PAL signal (VHF channel).

2. Set the signal strength to 55dBμV.

3. Enter FACTORY2 MODE to select TUNER-AGC, and presses AV to adjust RF AGC automatically, RF AGC value will display after adjustment ended.


. WHITE BALANCE ADJUSTMENT

NOTE: Must set BULE BACK as OFF before the unit aging.

1. Set TV to STANDARD mode.

2. Press AV to enter AV mode.

3.Enter FACTORY MODE.

4. Enter factory1,and seclect Rc128 menu , presses AV button on remote to get horizontal light line on the screen, adjust SCREEN potentiometer till horizontal light line shows R. G. B. Color, presses AV button again to return to normal status.

4. Input 'Left-Black & Right-White' signal for white balance adjustment.

5. Connect the XS602 plug that is on main board to control socket of the automatic test system.

6. Turn on Color Analyzer CA100 and adjust its zero point.

7. Run program (A:amb.exe).

8. Presses Space-Bar button or switch on the control socket to adjust white balance automatically. If OK, TICK sound will prompt.

9.Enter factory3,select sub-bright menu to adjust the sub-brightness to a good level.


. FOCUS ADJUSTMENT

1. Set CONTRAST control to maximum position and BRIGHTNESS control to middle position.

2. Adjust FOCUS control (on FBT) to obtain the sharpest and clearest picture on CRT.


. GEOMETRIC DISTORTION ADJUST (29”,34”SERIES)

Receive the black and white PAL Five-circles signal and set the picture as standard status input signal 80dBμV, enter factory5 mode to confirm 50Hz field amplitude and adjust the following items:


FACTORY MODE

Ver-size 42 Vertical Size

Ver-shift 21

S-Correct 05

C-Correct 15

Hor-Width 19

E/W Correct 00

E/W conner 00

Tapezium 08


. CHARACTER POSITION ADJUSTMENT

1. Receive the PAL Five-Circle pattern signal.

2. Enter FACTORY2 MODE to select H-Shift, press V+/V- buttons to adjust the symmetrical position.


Ⅺ. HIGH VOLTAGE TEST

1. Check if the power qualifies is standard voltage before adjusting high voltage.

2. Connect a precise High Voltage Meter to second anode of CRT.

3. Turn on the receiver, adjust BRIGHTNESS and CONTRAST to minimum (electron beam is zero).

4. High voltage being measured should below 30 Kilovolt (14", 16" & 21") or 32 Kilovolt (29").


1
TUNER


SAW FILTER



DECODER

STV2248C









AV INPUT

TC4052

AV1AV2 SVHS





R.G.B OUT


H OUT


V OUT

TDA8174


AUDIO OUT

TDA1905
























CRT



MCU + TELETEXT


SDA555X



4”, 21” BLOCK DIAGRAM



8V 5V 18V 110V


POWER SUPPLY

TDA4605 + MOSFET








2
TUNER


SAW FILTER



DECODER

STV2248C









AV INPUT

TDA7439S

AV1AV2 SVHS





R.G.B OUT


H OUT


V OUT+E/W

STV9306


AUDIO OUT

TA8246/8256
























CRT



MCU + TELETEXT


SDA555X



9”, 34”BLODK DIAGRAM



8V 5V 28V 135V


POWER SUPPLY

TDA4605 + MOSFET














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