Bush 1473 T, 1435, CTV 3459, 1434, 1474 T Manual

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BUSH 1433

General Information

Also Covers

Bush 1434, 1435, 1473 T, 1474 T, 1435 GTV

Alba CTV 3409, CTV 3459

Goodmans GTV 3409, GTV 3459

11 AK08 & 11AK20 Chassis

Safety Notes

DO NOT CHANGE ANY MODULE UNLESS

THE SET IS SWITCH OFF.

The mains supply side of the switch mode

power supply transformer is live. Use an

isolating transformer. The receivers fulfill

completely the sfety requirements.

Safety precautions

Servicing of this TV should only be carried out

by a qualified person.

• 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 fusable resistors must be

mounted in an identical manner to the original

component.

• When servicing this TV, check that the EHT

does not exceed 26 KV.

TV set switched off:

Make short-circuit between HV-CRT clip and

CRT ground layer.

Short 0808 (150µF) before changing IC801 or

other components in primary side of SMPS.

Measurements

Voltage readings and oscilloscope traces are

measured under following conditions. Antenna

Signal 60 dBuV from colorbar generator. (100%

white, 75% color saturation)

Brightness, contrast, color set for a normal

picture. Mains supply, 220V AC, 50 Hz.

Service Adjustments

The following preset adjustment procedures are

not required during installation and should be

made, if necessary, after servicing.

WARNING

EHT SHOCK HAZARD The EHT must be safely

discharged before attemping to disconnect the

EHT lead from the tube anode.

Clip one end of a convenient lead, such as a

meter lead, to the tube earthing strap on the

tube body, fold back the suction cap and

discharge the EHT through the lead.

Press in one side of the spring clip which

protects into the tube cavity to ease removal of

the EHT connector.

IMPORTANT

Do not disturb the tube neck adjustments as

these have been set for optimum performance

during the tube manufacture.

Before attemping the following adjustments, the

receiver should be tuned with the brightness,

contrast and colour controls adjusted for the

best picture and all measurements are to be

made after a warm-up period of approximately 5

minutes, unless stated otherwise.

- 60 dBmV signal at any channel frequency

- Color bar pattern and 1 KHz sound signal

- Mains 220-240V AC, 50Hz

The adjustments should be carried out in the

following order for convenience.

SMPS SYSTEM VOLTAGE

1) Set the BCS (Brightness, Contrast, Satura-

tion) and VOL (Volume) to minimum.

2) Check the voltage at the shorted pins of

socket PL602 (TP1)

3) If necessary, adjust VR801 112 ± 0.5V

(14”

and 15 models)

4) Set the BCS and VOL to normal picture and

sound

VISION DEMODULATOR AND AFC

1) Set the pattern generator for 10mV, 38.9 MHz

(B/G models) or 39.5 MHz (for I models) or

38.0 MHz (for 0/K models) RF output

2) Connect the RF output of the pattern

generator to any one input of SAW filter and

connect the other input of SAW filter to

ground through 10 nF capacitor (No antenna

input applied)

3) Check the voltage at the base of 0201 (TP2)

4) Adjust VL401 for 3.5 ± 0.1 Voc

2) PICTURE GEOMETRY AND FOCUS

1) Set the pattern generator for centre-cross,

circle and cross-hatch composite pattern.

2) Adjust VR702 for vertical size, VR701 for

vertical linearity, VR401 for horizontal

centering and focus potentiometer (on EHT

transformer) for optimum focusing.

TUNER AGC

1) Check the voltage at pin lof TUNER (TP4)

2) Adjust VR402 for 1V less than maximum.

SCREEN VOLTAGE

1) Set the pattern generator for grey scale.

2) Set the BCS (Brightness, Contrast, Satura-

tion) to minumum.

3) Measure cathode voltages on the CRT base

board by using a 1/1000 probe.

4) Adjust screen pot of FBT for 175 ± 2V reading

on maximum cathode voltage.

CRT BASEBOARD:CUT-OFF VOLTAGES AND

WHITE BALANCE

1) Set the pattern generator for grey scale.

2) Set the BCS (Brightness, Contrast, Satura-

tion) to minumum.

SECAM L MODULE (L/L’ AND B/G) OR (L/L’

AND K1) (11SL02)

1) Set the pattern generator for the colour bar

pattern at system PAL B/G and at frequency

of 63.75MHz.

2) Tune the receiver for the best picture.

3) Switch pattern generator to system SECAM L

and the receiver to SYS2 mode.

4) Connect the frequency counter to pin 13 of

IC101.

5) Adjust VL101 for 72.3MHz reading and

VR101 for no interference on the screen.

MAIN PCB FAULT FINDING GUIDE

AT FIRST CHECK ALL THE SUPPLY VOLTAGES, THEN CHECK FOLLOWING RELEVANT

POINTS FOR TROUBLE SHOOT!NG. TROUBLES SHOULD BE THE SAME AT ALL CHANNELS.

TROUBLE CHECK POINTS

NO PICTURE, N0 SOUND.............................................. TUNER VOLTAGES, INPUT/OUTPUT SIGNALS OK Q401, 1C401

NO PICTURE, SOUND OK ............................................. INT CVBS IN, IC401, SCREEN VOLTAGE

NO COLOUR ................................................................... IC401, IC402, IC403, X401

NO VERTICAL DEFLECTION......................................... 26 V, R711., PL701, IC701

VERTICAL LINEARITY.................................................... C705, VR701

VERTICAL SIZE .............................................................. R704, VR702

VERTICAL SHIFT ............................................................ VR703

VERTICAL FOLD............................................................. 26V, R711

HORIZONTAL LINEARITY .............................................. L601, C606

HORIZONTAL SIZE ......................................................... C603, SYSTEM VOLTAGE (112V)

HORIZONTAL FOLD ....................................................... SYSTEM VOLTAGE (112V)

FLUE PICTURE ............................................................... TR602, G3 (FOCUS), EHT, FLAMENT VOLTAGE

DARK PICTURE .............................................................. TR602 G2 (FOCUS), BRIGNES, CONTRAST VOLTAGE

NOISY PICTURE ............................................................. AGC V O LTAGE, RF SIGNAL

VERTICAL/HORIZONTAL SYNC. ................................... IC401

INTERFERENCE ............................................................. TUNER (TU201)

NO SOUND ...................................................................... R303, IC401. (PIN5), IC301

LOW SOUND ................................................................... IC401 (PIN5, SOUND CONTROL VOLTAGE), R303, IC301

SOUND DISTORTION..................................................... R303, IC301., 26V

POP NOISE ..................................................................... Q301, C307

CONTRAST ..................................................................... IC401 (PIN25)

BRIGHTNESS.................................................................. IC401 (PIN17)

COLOUR .......................................................................... IC401 (PIN26)

AUTO TUNING ................................................................ Q501

MEMORY ......................................................................... IC502

BAND SELECT ................................................................ IC503

NO VIDEO AT SCART ..................................................... SET AV MODE, CHECK IC401 (PIN5), (PIN6)

NO SOUND AT SCART ................................................... IC401 (PIN6)

MISSING CHARACTER AT TELETEXT ......................... SIGNAL AT PIN8 OF IC101

REMOTE CONTROL ....................................................... BATTERY, IR DIODE, CURRENT PATH OF IR DIODE

11TP09D-2 CRT MODULE COMPONENT USED FOR 14-15” CRT MODELS

PL902 3862021300 SOCKET CRT (MINI NECK)

COMPONENT DIFFERENCES DEPENDING ON CRT TYPES

COMPONENTS USED WITH 14” PHILIPS A34EAC01X06 CRTS

C603 3036227078 CAP MKP 6.2NF 1.6KV 3.5%

C606 3033344038 CAP MKP 330NF 400V J

C615 3051010832 SER 100PF 50V J

R456 3311620437 RES CF 1.6K 0W25 J

R717 3311020437 RES CF 1K 0W25 J

L601 4091411110 LINEARTY COIL 224L/150uH

4013150017 LOSS COIL 150uH

COMPONENT USED WITH 14” ORION A34JLL90X23 (W) CRTS

C603 3032827078 CAP MKP 7.8NF 1.6KV 3.5%

C606 3033344038 CAP MKP 430NF 400V J

C615 3054700836 CAP SER 47PF 50V J

R456 3311220437 RES CF 1K2 0W25 J

R717 3311020437 RES CF 1K 0W25 J

L601 4091411110 LINEARiTE COIL 224/50uH

COMPONENT USED WITH 14” GOLDSTAR A34KPU02XX46 CRTS

C603 3037527038 CAP MKP 7.5NF 1.6KV 3.5%

C606 3034341538 CAP MKP 430NF 250V J

C615 3051010832 CAP SER 100PF 50V J

R456 3311220437 RES CF 1K2 0W25 J

R717 3311020437 RES CF 1K 0W25 J

L601 4090109000 LINEARTY COIL 50uH

COMPONENT USED WITH 15” ORION A36JSW90X01 CRTS

C603 3036227038 CAP MKP 6.2NF 1.6KV 3.5%

C606 3033344038 CAP EL 330NF 400V J

C615 3051010832 CAP SER 100PF 50V J

R456 3311620437 RES CF 1.6K 0W25 J

R717 3315610437 RES CF 560R 0W25 J

L601 4091611100 LINEARITE COIL 15” LIN

11TP09G CRT MODULE COMPONENT USED FOR 14” CRT MODEL

PL902 3862021010 SOCKET CRT (NARROW NECK)

COMPONENT USED WITH 14” CAIHONG 37SX11OY22-DC05 CRTS

C603 3038227038 CAP MKP 8.2NF 1.6KV 3.5%

C606 3033344038 CAP EL 330NF 400V J

C615 3054700836 CAP SER 47PF 50V J

C901 3056810030 CAP SMD 680PF 50V J

C903 3055610030 CAP SMD 560PF 50V J

C905 3051020030 CAP SMD 1NF 50V J

C910 3051020030 CAP SMD 1NF 50V J

C911 3051020030 CAP SMD 1NF 50V J

C912 3051020030 CAP SMD 1NF 50V J

C913 NOT CONNECTED

C914 NOT CONNECTED

C915 NOT CONNECTED

C916 3052210030 CAP SMD 220PF 50V J

C917 3052210030 CAP SMD 220PF 50V J

C918 3052210030 CAP SMD 220PF 50V J

R456 3311220437 RES CF 1.2K 0W25 J

R717 RES CF 1K 0W25 J

R902 3311510830 RES SMD 150R 1/8W J

R909 3311510830 RES SMD 150R 1/8W J

R916 3311510830 RES SMD 150R 1/8W J

R907 3351032137 RES MO 10K 2W J

R914 3351032137 RES MO 10K 2W J

R915 3353993137 RES MO 3.9R 3W J

R921 3351032137 RES MO 10K 2W J

R922 3311510830 RES SMD 150R 1/8W J

R923 3313320830 RES SMD 3K3 1/8W J

R926 3313300830 RES SMD 33R 1/8W J

R931 NOT CONNECTED

R932 NOT CONNECTED

R933 NOT CONNECTED

L601 4090109000 LINEARITE COIL 224/50UH

4031001905 LOW FOCUS FBT

CRT Differences

Item Part No. Description

CPU & Adjustments

uC (MICROCONTROLLER):

The microcontroller hardware that is member of

the ST6 family has a TV receiver control

software with menu control. It controls the

chassis through IIC bus, PWM outputs and I/O

ports. Dominant features of controller are control

of optional teletext, outputs for OSD, IR control

signal receiving, and internal EEPROM.

The controller has IIC communication port at

#40 , #41 and OSD driver (R,G,B,FBI) at # 22, #

23, # 24, # 25. PWM control outputs are tuning

# 34; vertical linearity adjustment # 1; AGC

adjustment # 2. Other control outputs are Muting

- video ident # 3; led driver # 4; system switches

# 5, # 6, # 8, # 19, # 20, # 36; tuner switches #

18, # 19 and inputs are AFC information from IF

#9; keyboard # 10, # 11, # 13, # 14; scart mode

ident (4/3-16-9) #38, #39; horizontal sync # 26;

vertical # 27; infrared #35 and reset # 33.

The uC starts system according to option diodes

configuration (D501, D503, D505, D506, D508).

The controller has also a software which is able

to control some service adjustments: R, G, B

gain; R, G cut off; vertical position; vertical

linearity; horizontal position; vertical amplitude;

AGC; language selection for teletext.

For enter to service mode followed procedure

must be act within four seconds:

1 - Press volume down button on the keyboard;

2 - Press ‘prog’ button on the R/C hand set;

3 - Press ‘- -‘ button on the R/C hand set;

4 - Press “TV” button on the R/C hand set;

Parameters can be sellected by program up and

down, parameter adjustments can be done by

volume up and down buttons. Memorizing the

adjusted parameters can be done by pressing

red button. For exit from service mode Press

“TV “ button.

BUSH 1433

CRT Differences Tables

CRT Module Diagrams

Text Module Diagram

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