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Colour Television
Service Manual
Model CE25B4-C
Service Ref. No. CE25B4-C-00
PRODUCT CODE: 111339403
ORIGINAL VERSION: Chassis No. EB4-A
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 specifications for the design specifications
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.
Contents
Safety precautions/Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Cabinet disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Service control adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8
Circuit alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Important notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Cabinet parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Electrical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-19
Part No.
SKSM0392
F7PDS
(W.Europe)
JUNE 2000
25B4
CE
-C
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Summary of Contents for Sanyo CE25B4-C
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Page 1: Table Of Contents
Colour Television 25B4 Service Manual Model CE25B4-C (W.Europe) Service Ref. No. CE25B4-C-00 PRODUCT CODE: 111339403 ORIGINAL VERSION: Chassis No. EB4-A Note This TV receiver will not work properly in foreign countries where the television transmission system and power source differ from the design specifications. -
Page 2: Safety Precautions/Specifications
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 or 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. F7PDV... -
Page 4: Circuit 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...
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Page 6: Cabinet Disassembly
CABINET DISASSEMBLY CABINET BACK DISASSEMBLY 1. Remove 7 screws(A). 2. Pull out the cabinet back. F7PDV... -
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. IC3811 IC3801 K38H2 K38H1 AUDIO BOARD CRT BOARD IC1251 IC3451 IC3401... - Page 8 B1 POWER SUPPLY ADJUSTMENT HIGH VOLTAGE & WIDTH ADJUSTMENT 1. Set VR641 to be mechanically centre before pressing [HIGH VOLTAGE ADJUSTMENT] the mains ON/OFF switch. 1. Tune the receiver to the circular pattern. 2. Tune the receiver to a PAL circular pattern. 2.
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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
CABINET PARTS LIST FOR MODELS CE25B4-C-00 Note: Parts order must contain Service Ref. No., Part No., and descriptions. BASS -/-- Ref. No. Part No. Description CABINET PARTS 610 273 1835 ASSY,CABINET FR-F3PDV 610 261 6057 BUTTON POWER-F3SCM 610 286 7695... -
Page 12: Electrical Parts List
Note: Parts order must contain Service Ref. No., Part No., and descriptions. Description Ref. No. Part No. Chassis construction: Read description in the Capacitor and Resistor as follows: SERVICE REF. NO.: CE25B4-C-00 CAPACITOR CERAMIC 100P K 50V ASSY,PWB,MAIN F7PDS 1AA0B10H026V0 (Page 18) - Page 13 Description Ref. No. Part No. Description Part No. Ref. No. IC501 409 192 5709 IC LA7833 C146 403 010 8507 CERAMIC 12P J IC501-1 610 251 5909 V HEAT SINK E7LC C151 403 024 2112 CERAMIC 39P J IC501-2 411 036 3208 SCR PAN+SW+W 3X10 C162 403 068 2512...
- Page 14 Ref. No. Part No. Ref. No. Part No. Description Description C607 404 047 1608 ELECT 270U M 385V R1017 401 024 7430 CARBON 10K JA 1/6W C613 403 179 1213 POLYESTER 4700P J R1018 401 038 3514 MT-GLAZE 330 JA 1/10W C614 403 237 8057 MT-COMPO...
- Page 15 Description Ref. No. Part No. Description Part No. Ref. No. R2005 401 019 1941 CARBON 3K9 JA 1/4W R622 401 014 5241 CARBON 15K JA 1/4W R201 401 039 0413 MT-GLAZE 8.2K JA 1/10W R623 401 026 4328 CARBON 3K3 JA 1/6W R202 401 037 5717...
- Page 16 Description Ref. No. Part No. Ref. No. Part No. Description R873 401 038 6416 MT-GLAZE 4.7K JA 1/10W D1005 407 063 8319 ZENER DIODE MTZJ11C R874 401 037 5618 MT-GLAZE 10K JA 1/10W D1007 407 063 8319 ZENER DIODE MTZJ11C R875 401 038 7710 MT-GLAZE...
- Page 17 Description Ref. No. Part No. Description Part No. Ref. No. A1901 645 007 1546 SEE TABLE (PAGE 19) TP-D 645 008 4058 TERMINAL PLUG TP-E 645 008 4058 TERMINAL PLUG F601 423 022 2102 FUSE 250V 4.0A X131 421 002 2609 SAW F TSF5315 F601A 645 000 5077...
- Page 18 Ref. No. Part No. Ref. No. Part No. Description Description Q3432 405 109 4407 TR BC848 J3408 401 037 5014 MT-GLAZE 0.000 ZA 1/10W Q3482 405 109 4407 TR BC848 J3412 401 037 5014 MT-GLAZE 0.000 ZA 1/10W Q3484 405 109 4407 TR BC848 J3413 401 037 5014...
- Page 19 610 251 5831 GROUNDING CONNECTOR E7LC 1AV4U20B14300 J017 All information in this manual is correct at the start of production. Sanyo reserves the right to modify components and procedures in order to comply with 1AV4U20B20900 their continuous improvement policy. J016...
- Page 20 Sanyo Industries (UK) Ltd Printed in UK...