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Sanyo C21EF27 Service Manual

Colour television.
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Colour Television

Service Manual

Model: C21EF27
Ser Ref No. C21EF27-01
Product Code: 1113 19406
Chassis: EC5-A
Original Manual
Give complete "SERVICE REF. NO." for parts
order or servicing, it is shown on the rating sheet
on the cabinet back of the TV set.
Note
This TV receiver will not work properly in foreign
countries where the television transmission sys-
tem and power source differ from the design
specifications. Refer to the specifications for the
design specifications
SPECIFICATIONS
Power Source
Television System
Colour System
Receiving Channels
Aerial input impedance
AV Terminal
Speakers
Sound output
Picture tube
Visible picture
Dimensions (W x H xD) 696 x 465 x 483 mm
Weight
Part No. SKSM0200
E7PGV APRIL 1997
(W.EUROPE)
AC220~240V 50Hz
System BG
PAL
VHF : E2~E12
CATV : X,Y,Z,S1~S41
UHF : 21~69
75ohm
21 pin SCART (AV1)
Two 16ohm, 5 x 9cm
3W (cont.)
55 cm diagonal, 90˙
51 cm (diagonal)
21.5 kg
21DT1
CONTENTS
Safety precautions ..............................2
Main signal routing ..........................3
Power signal routing ........................4
Circuit description .............................5~6
Circuit alignment .................................9
Memory IC replacement ....................10
Special functions................................11
Cabinet parts list ................................12
Schematic Diagram .........................loose
Page

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Table of Contents

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   Summary of Contents for Sanyo C21EF27

  • Page 1: Table Of Contents

    21DT1 Colour Television Service Manual Model: C21EF27 (W.EUROPE) Ser Ref No. C21EF27-01 Product Code: 1113 19406 Chassis: EC5-A Original Manual Give complete "SERVICE REF. NO." for parts order or servicing, it is shown on the rating sheet on the cabinet back of the TV set.
  • Page 2: Safety Precautions

    SAFETY PRECAUTION 1: An isolation transformer should be connected in the 3: When replacing a chassis in the cabinet, always be cer- power line between the receiver and the AC line when tain that all the protective devices are installed proper- a service is performed on the primary of the converter ly, such as, control knobs, adjustment covers or transformer of the set.
  • Page 3: Block Diagram Main Signal Routing

    BLOCK DIAGRAM (Main signal routing) This is a diagram for all models and therefore differs slightly from the actual block diagram. V out V-F/B H out Service manual-EC5 chassis...
  • Page 4: Power Signal Routing

    (Power supply routing) Service manual-EC5 chassis...
  • Page 5: Circuit Description

    CIRCUIT DESCRIPTION 1. POWER SUPPLY IC201, and output from pin30 (R-Y) and pin31 (B-Y). The power supply circuit of the EC5-A chassis is com- These chroma signals pass through the 1H delay line cir- posed of a rectifier smoothing circuit, an oscillation circuit, cuit (IC271), and they are input to pin29 (R-Y) and pin28 a control circuit and an output rectifier circuit.
  • Page 6 ing signal is current amplified by the drive transformer Pin28: GND T431 and drives the output transistor Q432. When Q432 Pin29: - becomes ON, an amplifying current flows directly to DY Pin30: V-deflection stop output(Stop:Lo) through C441/C442 Q432 GND, and defec- Pin31: RGB REF Pin32: Blue output for OSD tion is performed in the last half of the scanning period.
  • Page 7: Service Control Adjustments

    SERVICE CONTROL ADJUSTMENT B1 POWER SUPPLY ADJ. AFT ADJ. TU-AGC ADJ. MAIN BOARD SW1901 SW1902 SW1903 SW1904 SW1905 SW1906 Prog- Level+ Prog+ Level- Function Memory IC801 F601 SW601 Fuse Mains SW R638 IC802 D615 Memory VR631 +B ADJ. Q612 IC001 T611 Audio output Converter...
  • Page 8 B1 POWER SUPPLY ADJUSTMENT HIGH VOLTAGE & WIDTH ADJUSTMENT 1. Set VR641 to be mechanical centre before pressing [HIGH VOLTAGE ADJUSTMENT] the main switch. 1. Tune the receiver to circular pattern. 2. Tune the receiver to PAL circular pattern. 2. Set brightness and contrast controls to maximum. 3.
  • Page 9: Circuit Alignment

    CIRCUIT ALIGNMENT 10kΩ 0.002µF 75Ω 1kΩ Output probe Input probe VIF alignment Adjustment SETTING Waveform DC 15.5V C644 + By using T141, adjust "P" to AGC voltage (4.3-4.5V) IC201-pin48 be maximum amplitude. Output probe IC201-pin45 (Side b) Input probe IC201-pin7 Marker frequency 38.9MHz Sweep ATT...
  • Page 10: Memory Ic Replacement

    MEMORY IC REPLACEMENT (Important Notice) When you replace a memory IC (IC802), it is neces- sary to initialise the IC as follows. A. Initialisation of Memory IC 1. When you press and hold the Recall button on the RC transmitter and then press the Prog + button on the TV set, the following picture will appear on the screen.
  • Page 11: Special Functions

    Special Function Special Function Maximum volume setting and prohibition of presetting Start up programme position This TV set allows you to set up the following special functions. Maximum volume setting and prohibition of presetting ITEM-1 Sets the current volume as the maximum volume level and ITEM-1 SET 0 prohibition of presetting.
  • Page 12: Cabinet Parts List

    CABINET PARTS LIST SERVICE REF.NO. C21EF27-01 -/-- Ref. No. Part No. Description CABINET PARTS 610 266 1750 ASSY,CABINET FR-E7PG 610 249 5331 BUTTON UNIT A-E7KC 610 249 5355 BUTTON POWER-E7PC 610 249 5072 CABINET BACK-E7PC 610 266 1736 DEC SHEET-E7PA...
  • Page 13: Chassis Electrical Parts List

    Note: Parts order must contain Service Ref. No., Part No., and descriptions. Ref. No. Part No. Description Ref. No. Part No. Description SERVICE REF. No. C21EF27-01 Read description in the Capacitor and Resistor as follows: CAPACITOR OUT OF CIRCUIT BOARD CERAMIC 100P K 50V Rated Voltage PICTURE TUBE...
  • Page 14 Ref. No. Part No. Deacription Ref. No. Part No. Deacription 405 019 2708 TR 2SC536-F-NP Q651 405 089 0000 TR 2SA1707-S 405 019 3804 TR 2SC536-G-NP 405 089 0109 TR 2SA1707-T Q104 406 007 2106 TR JC546A 405 009 6907 TR 2SB985-S 406 007 2007 TR JC546B...
  • Page 15 Ref. No. Part No. Deacription Ref. No. Part No. Deacription 409 241 5407 IC BA178M05T 403 070 2606 CERAMIC 0.1U Z 409 265 4806 IC L78M05CV C205 403 068 0409 CERAMIC 0.1U Z 409 172 1509 IC MC78M05CT 403 070 2606 CERAMIC 0.1U Z 409 320 5700...
  • Page 16 Ref. No. Part No. Deacription Ref. No. Part No. Deacription 403 232 2109 CERAMIC 680P K R1022 401 024 7400 CARBON 10K JA 1/6W C617 403 059 6205 POLYESTER 0.022U K R1023 401 020 2003 CARBON 4.7K JA 1/4W 403 179 2408 POLYESTER 0.022U K R1026...
  • Page 17 Ref. No. Part No. Deacription Ref. No. Part No. Deacription R252 401 037 5608 MT-GLAZE 10K JA 1/10W R803 401 037 9408 MT-GLAZE 180K JA 1/10W R253 401 024 7400 CARBON 10K JA 1/6W R804 401 012 7009 CARBON 10K JA 1/4W R271 401 016 2604...
  • Page 18 Ref. No. Part No. Deacription Ref. No. Part No. Deacription 610 239 7567 VR B-10K 407 013 1008 DIODE 1S1553 VR361 645 006 5422 VR,SEMI,10K N 407 013 4306 DIODE 1S2076A 610 239 7567 VR B-10K 407 013 6508 DIODE 1S2471 VR501 645 006 5408 VR,SEMI,100 N...
  • Page 19 Ref. No. Part No. Deacription Ref. No. Part No. Deacription 407 013 1206 DIODE 1S1555 405 066 9903 TR 2SC2688(1)-K D646 407 053 8302 ZENER DIODE MTZ8.2A 405 067 0008 TR 2SC2688(1)-L 407 057 8209 ZENER DIODE RD8.2EB1 405 067 0107 TR 2SC2688(1)-M 407 151 9102 ZENER DIODE UZ-8.2BCA...
  • Page 20 Printed in the U.K. Sanyo Industries [U.K.] Ltd.
  • Page 21 21DT1 cance to product safety. It is particu- MODEL NUMBER (C21EF27) signal strength. ore sono con tutti i controlli alle loro Il transistore 2SA608(E,F) puo essere mento del TV. larly recommended that only parts 7.
  • Page 23 L105 R102/R104/R106 1/10GJ 1/10GJ 1/10GJ TUNE Q102/Q104/Q106 R105 Q101/Q103/Q105 Waveforms on ICs and Transistors QT0378(A:B): QT0378(A:B): QT0378(A:B): R106 QT0379(A:B): QT0379(A:B): QT0379(A:B): 2SC536(E-NP: 2SC536(E-NP: 2SC536(E-NP: 2SA608(ECNP: 2SA608(ECNP: 2SA608(ECNP: F-NP:G-NP) F-NP:G-NP) F-NP:G-NP) Q105 FCNP:GCNP) FCNP:GCNP) FCNP:GCNP) IC201-pin7 IC201-pin15 IC201-pin18 IC201-pin19 IC201-pin20 R103 Q106 R104 <CVBS out>...
  • Page 24 V out V-F/B H out...

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