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Sanyo CE28D4-C Service Manual

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Colour Television
Service Manual
Model CE28D4-C
Service Ref. No. CE28D4-C-01
PRODUCT CODE: 111339815
ORIGINAL VERSION: Chassis No. EB4-A
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 system and power source differ
from the design specifications. Refer to the
Contents
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Part No.
SKSM0303
F7WTV
(W. Europe)
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APRIL 1999
28D4
CE
-C
F7WTV

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  Summary of Contents for Sanyo CE28D4-C

  • Page 1: Table Of Contents

    Colour Television 28D4 Service Manual Model CE28D4-C (W. Europe) Service Ref. No. CE28D4-C-01 PRODUCT CODE: 111339815 ORIGINAL VERSION: Chassis No. EB4-A 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 Precaution

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

    BLOCK DIAGRAM This is a diagram for all models and therefore differs slightly from the actual block diagram. F7WTV...
  • Page 4: Cabinet Description

    CIRCUIT DESCRIPTION 1. POWER SUPPLY control) The chroma signal is divided into R-Y and B-Y The power supply circuit of the EB4-A chassis is chroma signals, demodulated in IC201, and output from composed of a rectifier smoothing circuit, an oscillation pin30 (R-Y) and pin31 (B-Y).
  • Page 5 6. HORIZONTAL OUTPUT Pin25: Black A horizontal oscillation signal is output from pin37 of Pin26: IREF IC201 and switches the drive transistor Q431. This Pin27: Odd/Even output switching signal is current amplified by the drive Pin28: GND transformer T431 and drives the output transistor Q432. Pin29: - When Q432 becomes ON, an amplifying current flows Pin30: V-deflection stop output...
  • Page 6: Cabinet Disassembly

    CABINET DISASSEMBLY CABINET BACK DISASSEMBLY 1. Remove 7 screws(A). 2. Pull out the cabinet back. ANT75 Ω PLACING THE CHASSIS TO SERVICE POSITION 1. Pullout the chassis and put it to the rails on the side cabinet. 2. Fix main board with hook on the top rail. F7WTV...
  • Page 7: Service Control Adjustment

    SERVICE CONTROL ADJUSTMENT B1 POWER SUPPLY ADJ. AFT ADJ. TU-AGC ADJ. MAIN BOARD HIGH VOLTAGE & H-WIDTH ADJ. FOCUS ADJ. V-CENTRE ADJ. V-SIZE ADJ. H-CENTRE ADJ. SIF BOARD SIF ADJ. GREY SCALE ADJ. CRT BOARD IC3811 IC3801 K38H2 K38H1 AUDIO BOARD IC1251 IC3451 IC3401...
  • Page 8 B1 POWER SUPPLY ADJUSTMENT 1. Set VR641 to be mechanically centre before HIGH VOLTAGE & WIDTH ADJUSTMENT pressing the mains ON/OFF switch. [HIGH VOLTAGE ADJUSTMENT] 2. Tune the receiver to a PAL circular pattern. 1. Tune the receiver to the circular pattern. 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: Important Notice

    INITIALISATION (Important Notice) When you replace a memory IC (IC802), it is 2. Select the desired service item by using the Function necessary to initialise the IC as following step. button on the remote control handset. 3. Change the data by using the Level + or - button A.
  • Page 11: Cabinet Parts List

    DEC IND-F7WC 645 034 8617 SPACER HOLDER-F7WC 610 253 2449 HOLDER AC CORD-GBR-D4VA 610 261 3032 SPRING-E7GC 645 030 7355 BADGE,SANYO*53.5X12 GRAY 610 104 2505 LATCH PUSH,7.9X6.9BK\ SKZZ0072 DEG COIL CLIP-F4AC 412 059 7709 SPECIAL SCREW 411 076 1004 SCR TPG BRZ 4X12...
  • Page 12: Electric Parts List

    Note: Parts order must contain Service Ref. No., Part No., and descriptions. Description Part No. Ref. No. Chassis construction Read description in the Capacitor and Resistor as follows: CAPACITOR CE28D4-C-01 CERAMIC 100P K 50V Rated Voltage ASSY,PWB,MAIN F7WTV 1AA0B10H036B0 Tolerance Symbols: (Page 11)
  • Page 13 Description Ref. No. Ref. No. Part No. Part No. Description Q871 406 007 2106 TR JC546A C110 403 033 4510 CERAMIC 82P J Q872 406 007 2106 TR JC546A C1101 403 049 4204 ELECT 10U M Q873 406 007 2106 TR JC546A C1103 403 069 1712...
  • Page 14 Ref. No. Description Ref. No. Part No. Part No. Description C438 403 178 9319 POLYESTER 0.01U J R005 401 019 9640 CARBON 47 JA 1/4W C441 403 309 2100 POLYPRO 0.3U J 400V R006 401 014 4145 CARBON 1K5 JA 1/4W C445 403 049 4204...
  • Page 15 Part No. Ref. No. Part No. Description Description Ref. No. R1207 401 012 7049 CARBON 10K JA 1/4W R361 401 038 5419 MT-GLAZE 390K JA 1/10W R1208 401 038 0810 MT-GLAZE 22K JA 1/10W R363 401 038 0810 MT-GLAZE 22K JA 1/10W R1209 401 012 7049 CARBON...
  • Page 16 Ref. No. Description Ref. No. Part No. Description Part No. R804 401 024 7430 CARBON 10K JA 1/6W VARIABLE RESISTOR R806 401 024 7430 CARBON 10K JA 1/6W VR131 645 003 5531 VR 10K ALPS VR361 645 003 5531 VR 10K ALPS R807 401 024 7430...
  • Page 17 Ref. No. Part No. Description Description Ref. No. Part No. D1901-1 610 269 4710 HOLDER LED A-G2CA J233 401 037 5014 MT-GLAZE 0.000 ZA 1/10W D1901A 407 116 6504 LED SLP-181B-51 J234 401 037 5014 MT-GLAZE 0.000 ZA 1/10W D1903 407 063 8319 ZENER DIODE MTZJ11C J235...
  • Page 18 Ref. No. Description Ref. No. Part No. Part No. Description ASSY,PWB,SIF 3D-A2 ST 1AA0B10H0270A RESISTOR R1251 401 038 2111 MT-GLAZE 2.7K JA 1/10W R1252 401 038 9219 MT-GLAZE 6.8K JA 1/10W TRANSISTOR R1253 401 039 0512 MT-GLAZE 82K JA 1/10W Q3801 405 015 9711 TR 2SC2814-F4-TA...
  • Page 19 All information in this manual is correct at the start of Q711 405 041 6507 TR 2SC2621-D-RA Q721 405 041 6507 TR 2SC2621-D-RA production. Sanyo reserves the right to modify Q740 406 007 1901 TR JC556A components and procedures in order to comply with Q751 406 007 1901 TR JC556A their continuous improvement policy.
  • Page 20 Sanyo Industries (UK) Ltd Printed in UK F7WTV...
  • Page 21 I suddetti componenti devono essere 7. Waveforms were taken with posizione "OFF". Il voltaggio puo variare specified on the part service manual CE28D4-C-01 sostituti esclusivamente con quelli indi- SERVICE REF.NO. colour bar and controls adjusted con l'intensita del segnale.
  • Page 22 Main Board /Pannello Principal Circuit side/Lato del Circuito...
  • Page 23 CRT Board /Pannello Cinescopio J1EK1745- K1002 :J11B0490N Component Location/Lato del Componente 64 µ s 64 µ s 90Vp-p 100Vp-p ASSY,PWB,CRT F3SS 1AA0B10E48900 L2601 Q701 R704 L1022 L2C1 2SC2688'1' 2SJ12K Z21B0040N B-OUT 220KN SP901 (K:L:M) 134.3V A10B00400 :2SC2621 L1023 L1024 L1025 L1026 J10EA020N <B-DRIVE>...
  • Page 24 Main Board /Pannello Principal Component Location/Lato del Componente GENERAL BLOCK DIAGRAM FOR EB4 CHASSIS Audio- Video- Audio- SW1901 SW1902 SW1904 SW1903 input-R input-L Headphones Prog.+ Prog.- input Vol.- Vol.+ IC801 Audio In Video In 21P Scart: AV1 21P Scart: AV2 RC Pre.amp Control Keys Audio I/O...
  • Page 25 3D surround Board /Pannello 3D surround Circuit side/Lato del Circuito Audio Board /Pannello Audio Circuit side/Lato del Circuito C3842 C3842 C3842 Part No. SKP20215 F7WTV (SHEET 3/3)
  • Page 26 K35D J10EA030N FROM K12D...