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Colour TV Service Manual

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Model Group: CT-21NI9

CHASSIS: 3S10
MODEL: CT-21NI9R

Model No: CT-21NI9R Version 1.0

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CONTENT
SPECIFICATIONS .................................................................................................................................. 4 X-RAY RADIATION PRECAUTION .................................................................................................... 5 SAFETY PRECAUTION......................................................................................................................... 5 PRODUCT SAFETY NOTICE................................................................................................................ 5 ALIGNMENT INSTRUCTION............................................................................................................... 6 CIRCUIT DIAGRAM ............................................................................................................................ 13

Model No: CT-21NI9R Version 1.0

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SPECIFICATIONS
RECEIVING SYSTEM Sound System Colour System

: A = BG/DK/I/M, R, N = BG/DK/I, CP = BG : A = PAL/SECAM/NTSC/NTSC P/B R, N = PAL/SECAM/NTSC P/B CP = PAL/NTSC P/B : 54 cm (21") diagonal : 75 Ohm Coaxial Cable : Audio/Video-in/out : 3W x 2 : A = AC 100 ~ 260V 50/60Hz R,N,CP = AC 150 ~260V 50/60Hz : 21" = 80W : 21" = 602(W) x 488(D) x 457(H) mm : 21" (25 kg)

Picture Tube Ext. Antenna Ext. In/Out Speakers Volts Power Consumption Dimension Net Weigh REMOTE CONTROL Transmitting System Power Supply

: Infra-red : DC 3V (1.5Vx2)

Model No: CT-21NI9R Version 1.0

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

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 30KV. 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 should 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 XRay 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 resistorcapacitor network etc. 4. When replacing parts or circuit boards, disconnect the power cord. 5. When replacing a high voltage 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 blow, 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.

Model No: CT-21NI9R Version 1.0

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ALIGNMENT INSTRUCTION (3S10)
1. Preface This ADJUST MANUAL is only used for 3S10 chassis, and guides to make adjust equipments. It is only a reference. Instruments For Adjustment a. TV signal generator b. 20MHz 2-channel oscilloscope c. Adjust jigs d. Sweep Signal Generator(option) e. Digital voltmeter f. White balance adjust equipment. How To Enter And Exit Factory Mode a. Enter factory mode by pressing MENU button, AV button and ANAL button in turn or pressing the SERVICE button (on the right of MENU button, we can add this button for easy to enter service mode in factory). Press OK to enter Service 2.0 and Design mode. b. Exit factory mode by pressing PP or pressing STANDBY button.

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4. Chassis Adjust 4-1. VCO Adjust a. Set TV Signal Generator to output a 38.9MHz, stranger than 80dBuv PAL color bar signal. b. Signal inputs to TUNER's IF terminal or pin5 of SAW101 through a 0.01UF/50V capacitor c. Connect 220V AC (50/60Hz) and Switch on power switch. Enter Service 2.0 menu. d. Press AV button after picking out VCO Coarse or VCO Fine item by PROG+/- buttons. VCO is well adjusted automatically if the character OK appears at the bottom of screen. (If OK can not appear automatically, please fine tune LC238 and re-try again) e. The following adjustment is suitable for TV sets with SECAM L/L' system. Set TV signal Generator to output a 34.4MHz Signal, set TV set to VHF-L band. Press AV button after picking out VCO Coarse L1 or VCO Fine L1 by PROG+/- buttons. The VCO of SECAM L' system is well adjusted if the character OK appears automatically at the bottom of screen. Note: After VCO is well adjusted, exit factory mode by pressing PP button at first, switch off power switch, then withdraw IF signal. 4-2. IF Trap(LC101) Adjust For RF NTSC a. Receive RF NTSC signal. b. Adjust LC101 until picture is best.(We also can use a sweep sigmal generator to get best the trap point) 4-3. AGC Adjust a. Receive 60dBuV RF signal. b. Enter Service V2.0 mode and get Tuner AGC PAL item, adjust PAL AGC by VOL+/buttons until picture's noise just disappears and no distortion under 100dBuV level. c. If TV has SECAM LL1 system, enter Service V2.0 mode and get Tuner AGC LL1 item, adjust SECAM LL' AGC by VOL+/- buttons until picture's noise just disappears and no distortion under 100dBuV level. c. If TV has SECAME LL1 system, press OK key to enter design menu, set AGC Gain PAL to 1,set AGC Gain LL1 to 3

Model No: CT-21NI9R Version 1.0

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4-4. Main Power Adjust (B+) a. Switch on power switch. b. Measure the voltage with digital voltage meter between two terminals of C615. d. Adjust VR601 to obtain 110+/-0.5V on the Digital Voltage meter. (The voltage will have a little difference when use difference type of CRT.ORION A51JSW91X50 CRT is 118V;HITACH CRT is 110V) 5. Complete TV General Adjust 5-1. Screen Voltage Adjust(G2). Set TV set to factory mode without signal input. Then press MUTE button, a horizontal line appears. a. Adjust the "SCREEN" knob of FBT until a horizontal line is just can be seen. b. Pressing MUTE button to exit one line mode. 5-2. Focus Adjust a. Receive CROSS HATCH PATTERN, set picture to Dynamic statue by pressing PP button. b. Adjust the "FOCUS" knob of FBT to get a most clear picture. 5-3. White Balance Adjust. Receive black & white pattern (PAL SYSTEM) a. Set picture to Standard statue, adjust white balance equipment to get 2cd/m2 at low brightness and 100cd/ m2 at high brightness. b. Enter white balance adjust mode of factory mode. Two probes of white balance equipment close up the low brightness and high brightness area. c. Adjust Red Gain, Green Gain, Blue Gain; DC Red, DC Green, (DC Blue is better to fixed to 64) using remote handset to meet factory requirement. Button's function refers to the following table. Remote handset:

5-4. Horizontal/Vertical Central Adjust a. Receive MONOSCOPE PATTERN. b. Get H Position item, use VOL+/- buttons to set H center of the picture to meet factory requirement. c. Vertical central can not be adjusted by IIC bus. But we can use a 1.5K /2W resistor (R312 or R311 )or omit it to adjust it

Model No: CT-21NI9R Version 1.0

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5-5. SUB-Brightness Adjust a. Receive GREY SCALE/COLOR BAR pattern. b. Enter Service V2.0 mode. c. Press PROG +/- buttons to select Bright Max. Set a fixed value by VOL+/- buttons (The value will be difference when use difference type of CRT.. ORION A51JSW91X50 CRT is 63). d. Press ANAL button to get Bright Min item and bright, contrast, color become zero automatically. Press VOL+/- buttons to make the second darkness bar of GREY SCALE part loom. Press PIC again to exit this mode 5-6. Vertical Amplitude Adjust a. PAL system: adjust under VAMP 50. b. NTSC system: adjust under VAMP 60. 5-7 Sub-Tint adjust a. Receive NTSC RF signal. Set main Tint to center (zero). b. Set TV set in SERVEICE V2.0 mode and get Sub Tint item. c. Adjust SubTint using VOL+/- buttons until tint is best. 5-8 Set Picture's Standard Data 1. Adjust brightness/contrast/colour to the best mode you think Standard should be. 2 Enter white balance adjust mode, then press S.MODE key, MCU will store current brightness/contrast/colour data into Standard 5-9 Apr Threshold Adjust It is at the item of white balance adjustment menu. Apr means Automatic RGB Peak Regulation. It is used to increase the contrast of pictures with low contrast and avoid clipping at RGB output for picture with high peak amplitudes. Chang it's value to get perfect contrast quality of picture. It maybe different when use different CRT.( ORION A51JSW91X50 CRT sets 15) 5-10 E-W correction And H-Wide Adjust For Pure Flat CRT a. Receive cross pattern and set picture in Standard mode use PP key b. Adjust VR801 to set picture's wide c. Adjust VR802 to get a good linear pattern d. Adjust VR801 to set picture's wide if it is changed after adjust VR802

Model No: CT-21NI9R Version 1.0

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DESIGN FOR ST92195 AND SET OPTIONS OPERATING: Use MENU+AV+ANAL key to enter factory mode, OK key to enter Service 2.0 mode and Design mode. Use PP key to exit Factory mode. Use PROG+/- keys to select adjust item, use VOL+/- keys to set data. AGC Gain: usually set to zero. The initializations of Option1-5 are zero. Option 1: b7 b6 b5 b4 b3 b2 b1 b0 + + + + + + + Option 2: b7 b6 b5 b4 b3 b2 b1 b0 + + + + + + + Option 3: b7 b6 b5 b4 b3 b2 b1 b0 + + + + + Option 4: b7 b6 b5 b4 b3 b2 b1 b0 + + + + + 0/1 0/1 0/1 0/1 0/1 OFF/ON AV1(AV) OFF/ON AV2 OFF/ON SVHS ON/OFF RGB NOT USED 0/1 0/1 0/1 0/1 0/1 TDA7449/TDA7439 TDA1905/TDA7496 OFF/ON MANUAL/AUTO CUTOFF ON/OFF SECAM LL' FOR FRANCE PIF OVERMODULATION 0/1 0/1 0/1 0/1 0/1 0/1 OFF/ON CORING WHEN PEAKING OFF/ON AUTO FLESH WHEN NTSC OFF/ON BLACK STRETCH ON/OFF APR OFF/ON COLOR +6Db RESERVE TWO LANGUAGE/ONE LANGUAGE OSD 0/1 0/1 0/1 0/1 0/1 0/1 OFF/ON LOGO OFF/ON INTER CARRIER/QSS FORT NICAM OFF/ON HIGH GAIN TUNER SAFE (X-RAY) PROTECT ON/OFF OFF/ON CUT OFF LOOP RESERVE OFF/ON INTER CARRIER/QSS WITHOUT NICAM

Model No: CT-21NI9R Version 1.0

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Option 5: (Only used for TVs with teletext) Used to select teletext languages for different area use b0 = enable the remote controller to change Run_Time_Mode_Choice use "MENU" key b1, b2 = "Run_Time_Mode_Choice" ---------- set to 0/2/4/6!! Teletext languages option

MCU1
0: 1: 2: 3: ENGLISH, CYR2_LAT_Twist, SWEDISH, CZECH, ENGLISH, SERBIAN, LETTISH, AR_LAT_Twist POLISH, CYR2_LAT_Twist, ESTONIAN, CZECH, ENGLISH, SERBIAN, LETTISH, RUMANIAN ENGLISH, CYR2_LAT_Twist, SWEDISH, CZECH, ENGLISH, SERBIAN, LETTISH, FARSI_LAT_Twist POLISH, CYR2_LAT_Twist, SWEDISH, CZECH, ENGLISH, SERBIAN, LETTISH, FARSI_LAT_Twist

MCU2
0: 1: 2: 3: ENGLISH, FRENCH, SWEDISH, TURKISH, GERMAN, PORTUGUESE, ITALIAN, RUMANIAN ENGLISH, CYR2_LAT_Twist, SWEDISH, CZECH, GERMAN, CYR3_LAT_Twist, ITALIAN, RUMANIAN POLISH, FRENCH, SWEDISH, CZECH, GERMAN, SERBIAN, LETTISH, RUMANIAN POLISH, CYR2_LAT_Twist, ESTONIAN, TURKISH, GERMAN, CYR3_LAT_Twist, LETTISH, RUMANIAN

Notes: CYR2_LAT_Twist: Swedish: Czech: Lettish: Serbian: FARSI_LAT_Twist :

Russian Swedish/Hungarian Czech/Slovak lettish/Lithuanian Serbian/croarian/slovanian Persian

Note for option: Option1: b4----always set 0 Option2: b0---- usually set 0 can reduce picture's noise b1--- usually set 0 can auto revise tint of NTSC b2--- usually set 0 make picture's contrust better b3--- usually set 0 make picture's contrust better b4--- usually set 0 enlarge colour

Model No: CT-21NI9R Version 1.0

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Option3: b0---- always set 0 b1--- MCU's MUTE pin output voltage select. Set to 0 when use TDA1905(MUTE=0V), set to 1 when use TDA7496(MUTE=5V) b2--- always set 0 b3--- usually set 0 b4--- usually set 0 Option4: Only one AV input: b0=1 b2=0 Two AVs input : b0=1 b1=1 When SCART need, b0=1 b3=1 HPOS OSD: OSD left and right position, set to 001 VPOS OSD: OSD up, and under position, set to 01 HPOS TXT: teletext character left and right position VPOS TXT: teletext character above and under position LOGO set: 1 Set OPTION1 b0=1. 2 The last item of white balance adjustment mode is used to set LOGO there are most 12 characters to select .Use PROG+/-, VOL+/- buttons to change character. The highest bit means LOGO characters' number, it can be set among 1, 2, 3, 4, 5, 6, 789ABC. Note: The data of the above adjustment is written into IC002(24C08EEPROM). IC002 used on the product line must be well written data. If use a blank EEPROM (the interior data are set to FF) or not suitable for 3S10 chassis' EEPROM, it will be initialized (all data set to 00) and the special data will be written automatically when switch AC power on at the first few seconds. The values are following:

White Balance Adjust Menu
Red Gain DC Red Green Gain DC Gain Blue Gain DC Blue Apr Threshold LOGO 32 063 32 063 32 063 10 6

Model No: CT-21NI9R Version 1.0

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Service V2.0
Tuner AGC H Position V Position VAMP 50 VAMP 60 Bright Max Bright Min Sub Tint VCO Coarse VCO Fine VCO Coarse L1 VCO Fine L 1 * 32 32 32 32 32 63 00 32 05 63 05 080

| Desing
| AGC Gain | Option1 | Option2 | Option3 | Option4 | Option5 | ST Ttext | HPOS OSD | VPOS OSD | HPOS TXT | VPOS TXT | 00 00 00 00 00 00 00 001 01 057

The above values are automatically initializations. The purpose is to convenient for service out of factory. IC002 must be re-adjusted before being used in assembly line. ** In factory, we can set one chip of EEPROM as a model first and copy it to others.

Procedure for 3S10 Chassis (Only for reference)
1. Touch up line: a. B+ voltage adjust b. VCO adjust c. IF trap adjust for NTSC-M system. This can be done in FA line according to your option. We can adjust LC101 to get perfect NTSC-M system picture's quality and no disturbance of SIF signal. Final Assembly Line: a. Screen and Focus voltage adjust b. TAGC adjust c. White balance adjust d. H/V central and V Amp 50 adjust for PAL e. Bright Min adjust f. V AMP 60 and Sub Tint for NTSC

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Model No: CT-21NI9R Version 1.0