Sanyo C20LB18S 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. 18.6 Kg

Specifications subject to change without notice.

F5ZM

2 (1Vp - p, 75Ω)

2 (436mVrms, more than 40KΩ)

479(H)

483(D)mm

FILE NO.

Model No. C20LB18S

Service Ref. No. C20LB18S-00

Product Code: 111339911

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)

Table of Contents

Summary of Contents for Sanyo C20LB18S

Page 1 FILE NO. SERVICE MANUAL Colour Television Model No. C20LB18S (Argentina) Service Ref. No. C20LB18S-00 Specifications Product Code: 111339911 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 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. POP NOISE PREVENTION RIPPLE FILTER BLOCK BLOCK RIPPLE...
Page 8: Service Adjustments
Service Adjustments General This set has an On-screen Service Menu system includ- ed in the CPU thar allows remote operation for most of the service adjustments. Service Adjustment-1 1. Enter the Service Menu While pressing the MENU button on the televi- sion, press the Number Key 2 on the remote control unit.
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 Service Adjustments Items 16-23 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-16 RBIAS, 17 GBIAS, 18 BBIAS mode to 00. Set each value of Item-19 RDRIV, 21 BDRIV mode to 63, 20 GDRIV to 07.
Page 13 Service Adjustments Service Adjustment-2 (MTS Adjustment) Following table shows the initial values of MTS Adjustment which have been stored in the CPU ROM. Item Initial value Range INPUT LEVEL 00~63 HIGH SEPARATION 00~63 LOW SEPARATION 00~63 1. Enter the Service Menu While pressing the MENU button on the televi- sion, press the Number Key 3 on the remote control unit.
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
Service Adjustments 6. Select “HI SEPARATION” by pressing the CHANNEL UP/DOWN button on the remote control or TV set. INPUT LEVEL HI SEPARATION LOW SEPARATION ADJUST: - /+ CHOOSE: EXIT : MENU Minimum leakage TP-318 (L) 7. Adjust level of 4KHz at TP-318 (pin-39 of IC3401) to become minimum level by pressing the VOLUME (+/-) button on the remote control or TV set.
Page 16: Protection Circuit
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
LATCH PUSH,7.9X6.9BK 610 274 3654 DEC CONTROL SHEET-F2GS 610 273 5178 CABINET FRONT-F5ZA 610 274 3623 DOOR-F5ZA 645 040 1107 BADGE,SANYO*53.5X12L53.5 610 273 5185 CABINET BACK-F2GS 610 315 5234 LABEL RATING-F5ZM 645 051 8904 ASSY,REMOCON JXMRA 610 297 3723 RC-BATTERY LID-JXMRA...
Page 19: Chassis Electrical Parts List
Chassis Electrical Parts List F5ZM 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 F5ZM Ref. No. Part No. Description Ref. No. Part No. Description 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 405 011 8609 TR 2SC1740S-S Q611 405 013 6801...
Page 21 F5ZM Ref. No. Part No. Description Ref. No. Part No. Description 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 0.33U J 409 320 5700 IC UPC78M05AHF C233 403 045 1504 ELECT...
Page 22 F5ZM Ref. No. Part No. Description Ref. No. Part No. Description RESISTOR C609 404 047 1608 ELECT 270U M 400V 404 072 8405 ELECT 270U M 400V R003 401 026 3905 CARBON 330 JA 1/6W 404 078 7600 ELECT 270U M 400V R006 401 026 8108...
Page 23 F5ZM Ref. No. Part No. Description Ref. No. Part No. Description R263 401 105 0603 MT-GLAZE 10K JA 1/16W R623 401 026 4902 CARBON 330K JA 1/6W R264 401 024 9008 CARBON 120 JA 1/6W R624 402 001 8502 FUSIBLE RES 10 J- 1/2W R265...
Page 24 F5ZM Ref. No. Part No. Description Ref. No. Part No. Description R862 401 105 7404 MT-GLAZE 8.2K JA 1/16W 407 054 7007 ZENER DIODE RD16EB1 R863 401 105 5301 MT-GLAZE 4.7K JA 1/16W D441 407 006 6300 DIODE ERC05-10B R866 401 024 6700 CARBON 100 JA...
Page 25 F5ZM Ref. No. Part No. Description Ref. No. Part No. Description 407 013 4306 DIODE 1S2076A 405 041 6507 TR 2SC2621-D-RA 407 013 7109 DIODE 1S2473 405 041 6705 TR 2SC2621-E-RA D692 407 149 0807 DIODE 1SS355-TE-17 405 066 9903 TR 2SC2688(1)-K D693 408 008 2406...
Page 26 F5ZM Ref. No. Part No. Description Ref. No. Part No. Description 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 DIODE 1SS133 MISCELLANEOUS K701 645 026 2005...
Page 27 -27-...
Page 28 July/’04 NEWSAN S. A. Una empresa del grupo SANYO Electric Co.
Page 29 =12K W: Wire wounding SERVICE may be some components or partial circuit differences between the Rated wattage (1/2W) C20LB18S-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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