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Noblex 21TC657 Service Manual

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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
Low mid band: CH95-CH99
Video IF . . . . . . . . . . . . . 45.75MHz
Aerial Input Impedance . . 75Ω
Ext. Terminals
Video inputs: Phono jack
Audio inputs: Phono jack (R/L)
Headphone Jack: Mini stereo jack
Sound Output (RMS) . . . . 3W + 3W
Speakers . . . . . . . . . . . 5 cm x 9 cm x 2 pcs.
Dimensions . . . . . . . . . 606 (W)
Weight . . . . . . . . . . . . . approx. 21.0 Kg
Specifications subject to change without notice.
C4BP
NO BL EX
NO BL EX
2 (1Vp - p, 75Ω)
2 (436mVrms, more than 40KΩ)
1
479 (H)
483 (D)mm
NOBLEX
FILE NO.
Model No. 21TC657
Service Ref. No. 21TC657-00
Product Code: 111354912
Original Version
Chassis Series: LA5-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 specifi-
cation table.
(Argentina)

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Summary of Contents for Noblex 21TC657

  • Page 1 NOBLEX FILE NO. SERVICE MANUAL Colour Television Model No. 21TC657 (Argentina) Service Ref. No. 21TC657-00 NO BL EX NO BL EX Specifications Product Code: 111354912 Power Source ..AC220V, 50Hz / 60Hz Receiving System ..PAL (M/M, N/N), NTSC (M/M)

  • 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 SYSTEM CONTROL...

  • Page 5: Ic Block Diagrams

    IC Block Diagrams IC201 < IF/Video/Chroma/Def. > LA76818A Audio Output SIF Input FM Output/Selected SIF APC Filter Audio Output SIF Output PIF AGC Ext. Audio Input RF AGC Output PIF Input1 APC Filter VCO Coil 1 PIF Input 2 VCO Coil 2 IF Ground VCO Filter IF Vcc...
  • Page 6 IC Block Diagrams IC201 <IF System Block Diagram> LA76818A...

  • Page 7: Ic Block Diagrams

    IC Block Diagrams IC002 < Audio AMP. > LA42052-E IC501 < Vertical Output > LA78040N, TDA9302H STANDBY Thermal Protection INPUT AMP. OUTPUT AMP. OUT1 Pump REF AMP. THERMAL POWER PROTECTION CIRCUIT OUT2 INPUT AMP. OUTPUT AMP. RIPPLE FILTER POP NOISE PREVENTION BLOCK BLOCK RIPPLE...

  • Page 8: Service Adjustments

    VOLUME + VIDEO MODE IMAGE button on the remote control handset to select the NOBLEX desired service menu item you want to adjust. MENU Use the VOLUME + or - to adjust the data. The + or - button will increase or decrease the data sequentially.
  • Page 9 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. Item Initial value Range Description RFAGC 00~63 RF AGC adjustment H-PHA 00~31 H-PHASE adjustment (50Hz) V-POS 00~63 Vertical position adjustment (50Hz)

  • Page 10: Important Notice

    Service Adjustments Item Initial value Range Description COOP 00~07 Colour Killer Y-APF 00, 01 Y-APF Select DEEM 00, 01 De-emphasis TC V-LVL 00~07 Video Level FMLVL 00~31 FM Level TTEST 00~07 Trap Test IFOM-S 00, 01 Over Mod. SW IFMN-S 00, 01 Audio Monitor SW, Monitor/FM IFTRPS...
  • Page 11 Service Adjustments Item 01 [RFAGC] AGC Item 12 [OSDHP] OSD POSITION NOTE: Do not attempt this adjustment with weak signal. (1) Receive a monochrome circular pattern. (1) Tune the receiver to most clearest (or strongest) VHF (2) Set the brightness and contrast to normal. station in your area.

  • Page 12: Main Board

    T471-H3 T471-H2 T471-H1 C442-H1 C424-H1 Q432-H3 C423-H2 C425-H1 T471 T471-H4 Q432-H2 (FBT) F.B.T. T471-H5 Q432-H1 T471A Q432 C442-H3 T471-H6 H-OUT NOBLEX T471-H7 C442- T471-H10 T471-H8 T471-H9 C423-H1 JP487 JP486 C486A 1AV0U10B22200 L442 T471-H11 C420A-H1 C487 JXMMA R485 R487 D485 Q432-H4...
  • Page 13 Use the VOLUME + or - to adjust the data. The + or - button will increase or decrease the data MENU sequentially. SOUND SURROUND NOBLEX CHANNEL DOWN [ Service Adjustment ] NOBLEX VIDEO MODE IMAGE 3. Exit from the Service Menu Press the MENU button to turn off the Service Menu display.
  • Page 14 Service Adjustments SOUND LEVEL ADJUSTMENT MAIN BOARD 1. Connect a signal generator to TP-301(- side of C3411) CH - CH - MENU MENU on the Main Board and the ground. Signal output=300Hz, SW1902 K1002A K1002 150mVrms. K1921 SW1901 D1902 2. Connect a DC Volt-Meter to TP-317( pin-38 of IC3401) R1001 C693 D1011...

  • Page 15: Service Adjustment

    VOLUME + VIDEO MODE IMAGE on the remote control handset or TV set to make fine NOBLEX tuning adjustment. Press and hold the VOLUME + button for higher frequency tuning, and press and hold the VOLUME - for lower frequency tuning.
  • Page 16 Service Adjustments Service Adjustment-4 FOCUS ADJUSTMENT HIGH VOLTAGE CHECK (1) Receive the monochrome circular pattern. Note: +B (+130V) Voltage Check and Grayscale Adjustment (2) Set the brightness to normal and contrast to maximum. must be completed before attempting High Voltage Check. (3) Adjust the focus control on the F.B.T.

  • Page 17: 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 18: Cabinet Parts List

    645 005 0251 ANTENNA CONVERTER 610 104 2505 LATCH PUSH,7.9X6.9BK 610 288 9277 DEC CONTROL SHEET-C4BA 610 316 0931 INSTRUCTION MANUAL-C4BP 610 288 9185 CABINET FRONT-C4BA 610 291 9189 BADGE NOBLEX-C4CA 610 273 5185 CABINET BACK-F2GS 610 315 5265 LABEL RATING-C4BP -18-...

  • Page 19: Chassis Electrical Parts List

    Chassis Electrical Parts List C4BP 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.
  • Page 20 C4BP Ref. No. Part No. Description Ref. No. Part No. Description 405 163 1602 TR 2SC2812N-L6-TB0 405 173 9902 TR 2SC3928A1S 405 163 1701 TR 2SC2812N-L7-TB0 Q681 405 011 8401 TR 2SC1740S-Q 405 173 9803 TR 2SC3928A1R 405 011 8500 TR 2SC1740S-R 405 173 9902 TR 2SC3928A1S...
  • Page 21 C4BP Ref. No. Part No. Description Ref. No. Part No. Description IC202 409 241 5407 IC BA178M05T C230 403 215 2201 CERAMIC 0.01U K 409 265 4806 IC L78M05CV C231 403 260 2904 MT-COMPO 0.33U J 409 172 1509 IC MC78M05CT C232 403 260 2904 MT-COMPO...
  • Page 22 C4BP Ref. No. Part No. Description Ref. No. Part No. Description 403 312 8205 CERAMIC 1000P K C896 403 113 3805 CERAMIC 1000P K C609 404 047 1608 ELECT 270U M 400V RESISTOR 404 072 8405 ELECT 270U M 400V 404 078 7600 ELECT 270U M...
  • Page 23 C4BP Ref. No. Part No. Description Ref. No. Part No. Description R244 401 105 5400 MT-GLAZE 47K JA 1/16W R621 401 010 4802 CARBON 470K JA 1/2W R245 401 105 5400 MT-GLAZE 47K JA 1/16W R622 401 019 9600 CARBON 47 JA 1/4W R263...
  • Page 24 C4BP Ref. No. Part No. Description Ref. No. Part No. Description R857 401 027 8602 CARBON 8.2K JA 1/6W 407 056 9801 ZENER DIODE RD5.6EB1 R861 401 105 1501 MT-GLAZE 1.5K JA 1/16W D421 407 099 7208 ZENER DIODE MTZJ16A R862 401 105 7404 MT-GLAZE...
  • Page 25 C4BP Ref. No. Part No. Description Ref. No. Part No. Description D671 408 008 2406 DIODE 1N4148 405 067 0107 TR 2SC2688(1)-M 407 012 4406 DIODE 1SS133 Q711 406 000 3605 TR 2SC3620(LB-SAN-1) 407 013 4306 DIODE 1S2076A 405 041 6507 TR 2SC2621-D-RA 407 013 7109 DIODE 1S2473...
  • Page 26 C4BP Ref. No. Part No. Description Ref. No. Part No. Description DIODE D741 407 012 4406 DIODE 1SS133 D742 407 012 4406 DIODE 1SS133 D751 407 012 4406 DIODE 1SS133 D752 407 012 4406 DIODE 1SS133 D753 407 012 4406 DIODE 1SS133 D754 407 012 4406...
  • Page 27 -27-...
  • Page 28 NOBLEX July/’04...
  • Page 29 =12K SERVICE Rated wattage (1/2W) W: Wire wounding may be some components or partial circuit differences between the 21TC657-00 C: Solid actual chassis and the circuit diagram. REF. NO. 9. Parts specified with "X" are not installed in this model.
  • Page 30 Waveforms & Voltages CRT BOARD (Component Location) (On the Main Board) 1AA4B10E6900B IC002 (AUDIO AMP.) Pin-1 7.5V 1.6V 1.6V 5.8V 11.7V 17.7V 7.5V Q701 R741 B-OUT D741 10 GND 7.3V D742 J702 IC201 (IF/VIDEO/CHROMA) Q701-L D754 Q711 Pin-1 2.3V 2.2V 2.7V 1.8V 2.9V...

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