CP775 full manual.pdf

Service Manual

59 / 66 Cm STEREO Colour Television

CHASSIS : CP-775

MODEL :2594ST / 2896ST

2898ST / 28G2ST

25G1ST / 29G1ST

Specifications

CRT

25” : A59EAK071X11 (PHILIPS)

28” : A66EAK071X11 (PHILIPS)

System

TF : PAL - B/G for West Europe, NTSC-3.58 / 4.43 (Play back)

TA : PAL - B/G, SECAM-L/L’ for France, NTSC-3.58 / 4.43 (Play back)

TU : PAL- I for U.K, NTSC-3.58 / 4.43 (Play back)

TK : PAL/SECAM - B/G, D/K, NTSC-3.58/4.43(play back) for East Europe & CIS

Main Voltage

230V AC, 50Hz

Power Consumption

Stand-by mode : 10 Watts

Normal operating mode : 25” = 75 Watts

28” = 75 Watts

Sound output

5 + 5 Watts, 10 % THD at RF 60 % mod. (1 )

Speaker

12W 4 ohm x 2 EA

Antenna

75 ohm unbalanced input

Impedance

Tuning system

VS( voltage synthesis ) tuning

Tuner

3303KHC (TF, TA, TK, TI Model)

BAND I : CH2 - CH4

BAND III : CH5 - CH12

CABLE BAND : S1’ - S3’ , S1 - S20

HYPER BAND : S21 - S41

BAND IV, V : CH21 - CH69

DT2-IV17D (TU Model )

BAND IV, V : CH21 - CH69

Number of

70 programs

program

Aux. Terminal

21 pin EURO-SCART jack ( AV input, TV output, RGB input )

21 pin EURO-SCART jack ( AV input, S-VHS input )

RCA type AV input jack

Headphone jack (3.5 mm )

Remote controller

R-28B03 or R-35D05 with 2 “AA” type batteries

Teletext

8 pages memory TOP & FLOF

- West option :English, German/Dutch/Flemish, French, Italian,

Spanish/Portuguese, Swedish/Finnish/Danish, Czech/Slovak

- East option : Polish, Czech/Slovak, Rumanian, Hungarian, Servo-croat,

German/Dutch/Flemish, French, Italian

- Turkish option : Turkish, English, German/Dutch/Flemish, French,

Italian, Spanish/Portuguese, Swedish/Finnish/Danish

- Cyrillic option: Russian, Lettish/Lithuanian, Estonian, Ukranian,

Czech/Slovak, Servo-croat, English

OSD language

-East,West,Turkish Version : English,French,German,Italian,Spanish

-Cyrillic Version : Russian, English, German

21 PIN EURO-SCART

PIN Signal Designation

Matching Value

Audio Out(linked with 3)

0.5Vrms,lmp<1 (RF 60% MOD)

Audio In(linked with 6)

0.5Vrms,lmp>10

Audio Out(linked with 1)

0.5Vrms,lmp<1 (RF 60% MOD)

Audio Earth

Blue Earth

Audio in (linked with 2)

0.5Vrms,lmp>10

Blue in

0.7Vpp 3 ,lmp75

Slow(Function) Switching

TV:0-2V,PERI:9.5-12V,lmp>10

Green Earth

Green In

0.7Vpp 3 ,lmp75

Red Earth

Red In, C In

0.7Vpp 3 ,lmp75

Rapid(Blanking) switching

Logic 0:0-0.4V,Logic 1:1-3V,Imp 75

Video Earth

Rapid Blanking Earth

Video Out

1Vpp 3 ,lmp75

Video In, Y In

1Vpp 3 ,lmp75

Common Earth

20 18 16 14 12 10

21 19 17 15 13 11

Safety Instruction

WARNING: Only competent service personnel may carry out work involving the testing or repair of

this equipment.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially

hazardous X-RAY RADIATION.To avoid such

hazards, the high voltage must not exceed the

specified limit. The nominal value of the high

voltage of this receiver is 26 at max beam

current. The high voltage must not, under any

circumstances, exceed 29.5 (25"), 30 (28").

Each time a receiver requires servicing, the high

voltage should be checked. It is important to use

an accurate and reliable high voltage meter.

2. The only source of X-RAY Radiation in this TV

receiver is the picture tube.For continued X-RAY

RADIATION protection,the replacement tube

must be exactly the same type tube as specified

in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this

receiver is operating. Operation of the receiver

outside the cabinet or with the back board

removed involves a shock hazard from the

receiver.

1) Servicing should not be attempted by anyone

who is not thoroughly familiar with the

precautions necessary when working on high-

voltage equipment.

2) Discharge the high potential of the picture tube

before handling the tube. The picture tube is

highly evacuated and if broken, glass

fragments will be violently expelled.

2. If any Fuse in this TV receiver is blown, replace it

with the FUSE specified in the Replacement

Parts List.

3. When replacing a high wattage resistor(oxide

metal film resistor)in circuit board, keep the

resistor 10mm away from circuit board.

4. Keep wires away from high voltage or high

temperature components.

5. This receiver must operate under AC230 volts,

50Hz. NEVER connect to DC supply or any other

power or frequency.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this have

special safety-related characteristics. These

characteristics are often passed unnoticed by a

visual inspection and the X-RAY RADIATION

protection afforded by them cannot necessarily be

obtained by using replacement components rated

for higher voltage,wattage,etc. Replacement parts

which have these special safety characteristics are

identified in this manual and its supplements,

electrical components having such features are

identified by designated symbol on the parts list.

Before replacing any of these components, read the

parts list in this manual carefully. The use of

substitute replacement parts which do not have the

same safety characteristics as specified in the parts

list may create X-RAY Radiation.

Alignment Instructions

1. AFT

1.1 Standard B/G,D/K,I and L

1) Set a Signal Generator with

- RF FREQUENCY = 38.9 MHz,

- RF OUTPUT LEVEL = 80 5 dBuV

- System = PAL / SECAM - B/G, D/K, I

2) Connect the Signal Generator RF Output to P101 (Tuner IF Output).

There must be no signal input to the tuner.

3) Press the “AFT” KEY and wait until the TV screen display “AFT OK”.

1.2 Standard SECAM-L’ (France VHF-Low)

Above mentioned “1.1” adjustment has to be done in advance.

1) Set a Signal Generator with

- RF FREQUENCY = 34.5 MHz,

- RF OUTPUT LEVEL = 80 5 dBuV

- System = SECAM - L’

2) Connect the Signal Generator RF Output to P101 (Tuner IF Output).

There must be no signal input to the tuner.

3) Press the “L’ AFT” KEY and wait until the TV screen display “L AFT OK”.

2. AGC

1) Set a Pattern Generator with RF LEVEL 63 2 dBuV .

2) Connect a OSCILLOSCOPE PROBE to P101 (TUNER AGC INPUT).

3) Adjust AGC UP/DOWN KEY the voltage drop 1V dc over below its maximum voltage.

Alternative Method

1) Set a Pattern Generator with

- RF LEVEL 80 5 dBuV

- PAL CROSSHATCH

( without SOUND CARRIER )

2) Connect a OSCILLOSCOPE

( Bandwidth 100MHz ) PROBE

to P101 (TUNER IF OUTPUT).

3) Use AGC UP/DOWN KEY to obtain

an envelop amplitude 200 + 50 mVp-p.

3. SCREEN

1) Apply a COLOR BAR pattern signal.

2) Set the CONTRAST, BRIGHTNESS

Black level

to MAX, COLOR to MIN.

3) Set the R,G,B LEVEL to CENTER (31/63)

140 5Vdc

with R,G,B UP/DOWN KEY.

4) Connect a OSCILLOSCOPE PROBE

to P906 ( CRT CATHOD R, G, B ).

5) Adjust the SCREEN VOLUME on FBT

such that the highest black level voltage

GND

140 5Vdc.

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