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SERVICE MANUAL Colour Television
Specifications
Power Source . . . . . . . . . AC220V, 50Hz / 60Hz
Receiving System . . . . . . PAL (M/M, N/N), NTSC (M/M)
Channel Coverage
Antenna mode VHF: CH02-CH13, UHF: CH14-CH69
CATV mode
VHF band: CH01-CH13, Mid band: CH14-CH22
Super band: CH23-CH36, Hyper band: CH37-CH64
Ultra band: CH65-CH94 and CH100-CH125
Cabinet type 2 with Noblex control part
Low mid band: CH95-CH99
Aerial Input Impedance . . 75Ω
Input Terminals
AV1 (Video): Phono jack ✕ 1
AV1 (Audio): Phono jack (R/L) ✕ 1 set
AV2 (Video): Phono jack ✕ 1
AV2 (Audio): Phono jack (R/L) ✕ 1 set
Output Terminals
Video Monitor Output: Phono jack ✕ 1
Audio Monitor Output: Phono jack (R/L) ✕ 1
Headphone Jack: Mini stereo jack ✕ 1
Sound Output (RMS) . . . . 3W + 3W
Speakers . . . . . . . . . . . 5cm x 9cm x 2 pcs.
Dimensions . . . . . . . . . 597(W) X 464.5(H) X 335(D) mm
Weight . . . . . . . . . . . . . approx. 20Kg
Specifications subject to change without notice.
BE2A
NOBLEX
FILE NO.
Model No. 21TC677U
Service Ref. No. 21TC677U-00
JXMRR
Product Code: 13015400
映像メディア（事）デザイン部
Original Version
Chassis Series: LA8-A
Give complete "SERVICE REF. NO." for
parts order or servicing. It is shown on the
rating plate at the cabinet back of the unit.
This T.V. receiver will not work properly in
foreign countries where the television trans-
mission system and power source differ from
the design specifications. Refer to the speci-
fication table.
(Argentina)
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Summary of Contents for Noblex 21TC677U
- Page 1 VHF band: CH01-CH13, Mid band: CH14-CH22 Super band: CH23-CH36, Hyper band: CH37-CH64 Chassis Series: LA8-A Ultra band: CH65-CH94 and CH100-CH125 Cabinet type 2 with Noblex control part Low mid band: CH95-CH99 Aerial Input Impedance . . 75Ω Input Terminals Give complete “SERVICE REF. NO.” for AV1 (Video): Phono jack ✕...
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Page 2: Table Of Contents
Contents Safety Notice ................2 Chassis Block Diagram . -
Page 3: Chassis Block Diagram
Chassis Block Diagrams MAIN SIGNAL PROCESSING CIRCUIT... - Page 4 Chassis Block Diagrams POWER SUPPLY IC601 (STRW6754)
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Page 5: Ic Block Diagrams
IC Block Diagrams IC201 < IF/Video/Chroma/Def./CPU > LA76933... - Page 6 IC Block Diagrams IC501<Vertical.Output> LA78141 IC001<AUDIO AMP> LA42205...
- Page 7 IC Block Diagrams IC3401 LA72703...
- Page 8 R2A15908SP IC Block Diagrams IC3402 R2S15908SP ROUT INR5 Mode selector INR4 LOUT TRER INR3 Surround Input selector INR2 BASSR1 INR1 BASSR2 mute BASSL2 INL1 Mono /Stereo INL2 BASSL1 INL3 TREL Input selector INL4 DGND INL5 Input gain control IGOUTL mute 0~+20dB /2dB step Volume...
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Page 9: Service Adjustments
Service Adjustments General This set has an On-screen Service Menu system included in the CPU that allows remote operation for most of the service adjustments. IC802 (EEPROM) Replacement When IC802 (EEPROM) is replaced, IC801 (CPU) will automatically write the initial reference data into IC802 for basic TV operation. However, the bus data should be checked and some bus data should be set up before attempting the service adjustments. - Page 10 Service Adjustments On-screen Service Menu Following table shows the initial values which have been stored in the CPU ROM, and items for the service adjustments. When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. The shaded menu should be checked and be set up or readjusted according to the procedures described in the following pages.
- Page 11 Service Adjustments Item Description Initial Value Range 0 R-YDN Difference value of NTSC R-Y DC Level -16~+15 G-YA G-Y Angle 00~01 RBGB R-Y/ B-Y Gain Balance 00~15 RBAG R-Y/ B-Y Angle 00~15 G-YAN NTSC G-Y Angle 00~01 RBGBN Difference value of NTSC R-Y/B-Y Gain Balance -8~+7 +4 RBAGN...
- Page 12 Service Adjustments Item Description Initial Value Range GRAY GRAY MODE CROSS CROSS B/W HL-TON HALF TONE LEVEL AVNCON AV CONTRAST (No Signal in AV) 00~127 AVNBRI AV BRIGHT (No Signal in AV) 00~127 POMT Power Mute Time 00~127 05 CHMT Ch Mute Time 00~31 SYST...
- Page 13 Service Adjustments Important Notice: Do not attempt to adjust service adjustments not listed on below otherwise it may cause loss of performance and for correct operation. Item 01 [RFAGC] AGC Item 04 [V-SIZ] VERTICAL SIZE NOTE: Do not attempt this adjustment with weak signal. 1.
- Page 14 Service Adjustments Items 28-33 GREY SCALE (1) Receive a monochrome circular pattern. (2) Set the brightness and colour to normal, contrast to maximum. (3) Enter to the service mode. (4) Set each value of Item-28 RBIAS, 29 GBIAS, 30 BBIAS mode to 00. Set each value of Item-31 RDRIV, 33 BDRIV mode to 64, 32 GDRIV to 08.
- Page 15 Service Adjustments Service Adjustment-2 (MTS Adjustment) 1. Enter the Service Menu While pressing the MENU button on the television, press the “3” or MENU button on the remote control unit. The Service Menu now appear. VOLUME OFFSET 21-BE2F/BE TREVLE OFFSET BASS OFFSET MENU...
- Page 16 Service Adjustments Service Adjustment-3 FINE TUNING This adjustment is used to do a fine tuning of the channels with poor reception after they have been stored by the automatic tuning. This function is available for one channel only and the fine-tuned channel is memorized into IC802 (EEPROM). 21-BE2F/BE2A 1.
- Page 17 Service Adjustments Service Adjustment-3 Protection Circuit This TV set has a built-in power supply protection circuit. FOCUS ADJUSTMENT It is provided to protect the TV set in case of a power supply circuit malfunctions. When something abnormality 1. Receive the monochrome circular pattern. occurs during TV reception, the TV set goes to the stand- 2.
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Page 18: Purity And Convergence Adjustment
Purity and Convergence Adjustment CAUTION: The Convergence and Purity adjustments have been made at the factory. Readjustment should be made only after picture tube or deflection yoke replacement, following the steps below: PURITY ADJUSTMENT 8. Tighten the mounting screw of the Deflection Yoke. Adjust 1. -
Page 19: Cabinet Parts List
Cabinet Parts List Note: Parts order must contain Service Ref. No., Part No., and descriptions. 21-BE2F/BE2A/BE2J/BE2P Cabinet type 2 with Noblex control part JXMRR Key No. Part No. Description Key No. Part No. Description 1AA2BUM0580-- BUTTON POWER-BE2A 1S00620 COIL SPRING-D8HA 映像メディア（事）デザイン部... -
Page 20: Chassis Electrical Parts List
Chassis Electrical Parts List Product safety should be considered when a component replacement is made in any area of a receiver. Components indicated by a mark in this parts list and the circuit diagram show components whose value have special significance to product safety. It is particularly recommended that only parts specified on the following parts list be used for components replacement pointed out by the mark. - Page 21 Chassis Electrical Parts List Safety Safety Location Part No. Description Location Part No. Description A013 013BE2E ELECTRICAL PARTS C227 CK1H103KGQBNZ CERAMIC 0.01U K 50V L901 1LB4L81B02600 COIL,DEGAUSSING C228 CK1E104KGQBNZ CERAMIC 0.1U K 25V L901 1LB4L81B03100 COIL,DEGAUSSING C231 CGXLB1J474ZAN MT-POLYEST 0.47U J 63V Q901 BXXAVB578SFQ- CRT-AS A51QGV991X003(D) C232...
- Page 22 Chassis Electrical Parts List Safety Location Part No. Description Safety Location Part No. Description C435 CMXAA3Y962AKN MT-POLYPRO 9600P H 1.5K C624 CEXLB0J222VEN ELECT 2200U M 6.3V C435 CM3Y962HANA0N MT-POLYPRO 9600P H 1.5K C625 CEXLB1C101VEN ELECT 100U M 16V C436 CMXAA3Y982AKN MT-POLYPRO 9800P H 1.5K C627 CKXAA2G102ANN...
- Page 23 Chassis Electrical Parts List Safety Location Part No. Description Safety Location Part No. Description D466 DZMTZJ20A---N ZENER DIODE MTZJ20A D624 DZXLBXA6.8B-N ZENER DIODE ZJ6.8BST D466 DZXLBXA20A--N ZENER DIODE ZJ20AST D631 DDXLBB031---N DIODE RN1Z D466 DZXLBZA20A--N ZENER DIODE MTZJ20A D667 DDXLBB053---G DIODE 1SS35 D467 DDXAAED0434--...
- Page 24 Chassis Electrical Parts List Safety Location Part No. Description Safety Location Part No. Description Q1902 TXXLBB001---N TR CJA1015-Y R1901 RGF2201JTCANZ MT-GLAZE 2.2K JA 1/10W Q1902 7T200182 2SA933S R1902 RGF2701JTCANZ MT-GLAZE 2.7K JA 1/10W Q1903 TXXLBB006---P TR MMBTSC3928R R1903 RGF4701JTCANZ MT-GLAZE 4.7K JA 1/10W Q1903 7T200220 TR 2SC2412K(P)-6...
- Page 25 Chassis Electrical Parts List Safety Location Part No. Description Safety Location Part No. Description R434 RSXLB2271JXAS OXIDE-MT 270JA R619 RDB1802JPBANN CARBON 18K JA 1/4W R434 RSXLB2271JYAS OXIDE-MT 270JA R620 RDB1001JPBANN CARBON 1K JA 1/4W R434 RS22700JGDAGN OXIDE-MT 270 JA R621 RDD10R0JPAANN CARBON 10 JA 1/6W...
- Page 26 Chassis Electrical Parts List Safety Safety Location Part No. Description Location Part No. Description SW1904 1AV4S10B0450J SWITCH,PUSH 1P-1TX1 Q721A T2SC2621-ERAN TR 2SC2621-E-RA SW1904 1AV4S10B2790J SWITCH,PUSH 1P-1TX1 Q721A T2SC2688(1)KN TR 2SC2688(1)-K SW1904 1LB4S10B0200J SWITCH,PUSH 1P-1TX1 Q721A T2SC2688(1)LN TR 2SC2688(1)-L SW1905 1AV4S10B0450J SWITCH,PUSH 1P-1TX1 Q721A T2SC2688(1)MN TR 2SC2688(1)-M SW1905 1AV4S10B2790J...
- Page 27 May/’08...
- Page 28 N: Metalized carbon Kind (M.carbon) SERVICE 8. This circuit diagram covers a basic or representative chassis only. S: Oxied metalized 21TC677U W: Wire wounding Rated wattage (1/2W) There REF. NO. C: Solid may be some components or partial circuit differences between the actual chassis and the circuit diagram.
- Page 29 Waveforms & Voltages Component Location (On the Main Board) IC001 (AUDIO AMP.) Pin-1 0.75V 0.75V 2.84V 4.01V 5.6V 5.6V 5.6V 5.6V IC201 (IF/VIDEO/CHROMA/CPU) Pin-1 2.0V 2.4V 3.1V 2.2V 2.3V 2.3V 2.3V 5.0V 2.5V 3.6V 8.3V 2.6V 2.5V 2.4V 2.3V 1.7V 5.1V 20 2.7V 0.7V...