Erisson 5N10 Service Manual

SKYWORTH

SERVICE MANUAL

COLOUR TELEVISION PAL/SECAM BG/DK /NTSC PLAYBACK

CHASSIS :

3N10, 4N10 MODEL : 1418, 1498, 1422, 2122, 2199, 21F1, L21, D21

CHASSIS :

5N10

MODEL: 2522, 2588, 25F1, 2998, 2922

2929, 29F1, 3423, 3498, 3898,

L25, D25, L29, D29, L34, D34

3N/ 5N10 7-2-2001

CONTENTS

PAGE

X-Ray RADIATION PRECAUTION ………………………………………………………………………………………. 2 SAFETY PRECAUTION ……………………………………………………………………………………………….….. 2 PRODUCT SAFETY NOTICE …………………………………………………………………………………………….. 2 CHASSIS ADJUSTMENT…………………………………………………………………………………………………. 3 COMPLETE MACHINE GENERAL ADJUSTMENT……………………………………………………………………. 3-5

NOTES………………………………………………………………………………………………………………………

COLOUR PURITY AND CONVERGENCE ADJUSTMENT ………………………………...………………………… 10 BLOCK DIAGRAM ………………………………………………………………………………………………………… 11 WIRE DIAGRAM …………………………………………………………………………………………………………… 12 SCHEMATIC DIAGRAM…………………………………………………………………………………………………… SPECIFICATIONS………………………………………………………………….………………………………..……

5-9

CAUTION

Before serving the chassis, read the "X-Ray Radiation Precaution", "Safety Precaution" and "Product Safety Notice" on page 2 of this manual.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-Ray Radiation. To avoid such hazards, the high

voltage must not be above the specified limit. The normal value of the high voltage of this receiver is 24KV at zero beam current (minimum brightness) under 220V AC power source. The high voltage must not, under any circumstances, exceed 29KV.

2. Each time a receiver requires servicing, the high voltage should be checked following the High Voltage Check

procedure in this manual. It is recommended the reading of the high voltage be recorded as a part of the service record. It is important to use an accurate and reliable high voltage meter.

3. The primary 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 part list.

4. Some parts in this receiver have special safety – related characteristics for X-Ray Radiation protection. For

continued safety, parts replacement should be undertaken only after referring to the Product Safety Notice.

SAFETY PRECAUTION

Warning: Service should not be attempted by anyone unfamiliar with necessary precaution on this receiver. The following are the necessary precautions observed before servicing this chassis.

1. Since the power supply circuit of this receiver is directly connected to the AC power line, an isolation transformer

should be used during any dynamic service to avoid possible shock hazard.

2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The

picture tube is highly evacuated and if broken, glass fragment will be violently expelled. Use shatter proof goggles and keep picture tube away from the unprotected body while handling.

3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place,

such as: non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

4. When replacing parts or circuit boards, disconnect the power cord.

5. When replacing a high wattage resistor (Metal oxide film resistor) on circuit board, keep the resistor 10mm (1/2in.)

away from circuit board.

6. Connection wires must be kept away from components with high voltage or high temperature.

7. If any fuse in this TV receiver is blown, replace it with the FUSE specified in the chassis part list.

8. The receiver is designed to operate with 220V(50/60Hz) AC mains.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis 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 high wattage, etc. Replaced parts which have these special safety characteristics are identified in this manual and its supplements, electrical components having such features are shaded on the schematic diagram and the part list.

Before replacing any of these components, read the part list in this manual carefully. The use of substitute replacement parts, which do not have the same safety characteristics, as specified in the part list may create shock, fire, and X-Ray Radiation or other hazards.

CHASSIS ADJUSTMENT

1. B+ voltage adjustment (For 3N and 4N chassis only)

1-1 Connect 220V AC 50Hz to CN601 and switch on power switch SW601; 1-2 Test the voltage with digital voltage meter between two terminals of C625; 1-3 Adjust VR601 to obtain +110V+/-0.5V reading on the digital voltage meter. Note: The 5N chassis is auto B+ voltage by SE130 or SE140 used.

2. NTSC system absorbing adjustment 2-1 Set sweep generator marker to 31.5MHz, 33.5MHz, 34.42MHz, 37MHz, 38MHz and 40.5MHz; 2-2 Apply 80dBuV sweep signal to tuner IF terminal; 2-3 Display demodulation probe connects to pre-I.F AMP input terminal, via. Q101 'b' pole; 2-4 Set Q103 'c' pole and 'e' pole short circuit, adjust L104, and make the attenuation most at 33.5MHz.

3. Memory partial initializing

3-1 Go to the function set menu (there are two ways;)

a. Press CH+(PROG+) key and CH-(PROG-) key on the control board at the same time and switch on

power switch, then go to the function set menu.

b. After TV is on, press "factory" key (See Note 1) twinthen go to the function set menu.

3-2 Press 'PM' key and 'SM' key on the control board at the same time until the picture changes slightly

(jumpiness or twinkling at one blow), this means the memory having been partial initialized. Operate repeatedly if the picture has no change.

All of the TV set must be partial memory initialized before exfactory or after change of the Chroma IC

NN5198 / NN5199 or fully memory initialized after change of the EEPROM 24C04 (Note 4).

4. search and storage

COMPLETE MACHINE GENERAL ADJUSTMENT

1. Screen Voltage Adjustment. 1-1 Press 'screen' key (See Note 1); 1-2 Adjust the screen knob of FBT to get a horizontal faintness beam line; 1-3 Press 'screen' key again or 'stand by' key to go to the normal work status;

2. Focus Voltage Adjustment. 2-1 Receive monoscope pattern. Set picture mode standard status; 2-2 Adjust the focus knob of FBT to get the clearest picture.

3. horizontal center adjustment 3-1 Receive monoscope pattern; 3-2 Press 'factory' key (See Note 1)one time and go to system parameter adjustment menu; 3-3 Press 'MENU' key , go to horizonta l and vertical parame ter adjust ment men u; 3-4 Select 'H POSITION" by pressing 'PROG+' key and 'PROG-' key. Press 'VOL+' key and 'VOL-' key to obtain the horizontal center of the pattern at the center of CRT screen.

+ 7 hidden pages