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Colour Television
Service Manual
Model: CE25MT2A-C
Service Ref. No. CE25MT2A-C-01
PRODUCT CODE: 111327415
ORIGINAL VERSION: Chassis No. EC5-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 coun-
tries where the television transmission system 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
21 pin Terminal
Speaker
Sound output
Picture tube
Visible picture
Dimensions (W x H xD)
Weight
Part No. SKSM0299
F4ATV NOVEMBER 1998
(W.EUROPE)
AC220~240V 50Hz
System BG, DK
PAL/SECAM
VHF : E2~E12, R1~R2, R12
CATV : X,Y,Z,S1~S41
UHF : 21~69
75ohm
AV1: CENELEC Standard
8 ohm, 5 x 9 cm
5 watts
63 cm diagonal, 90°
59 cm
(diagonal)
584 x 533.5 x 446.6 mm
24.5 kg
25MT2A
CE
precautions....................................................2
Main signal
routing................................................3
description...............................................5 ~ 6
adjustments...............................7 ~ 8
alignment.......................................................9
Special
functions.....................................................11
Cabinet parts
Chassis electrical parts
Schematic Diagram ...........................................loose
-C
Contents
.............................................4
.........................................10
list.............................13 ~ 20
Page
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Summary of Contents for Sanyo CE 25MT2A-C
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Page 1: Table Of Contents
25MT2A Colour Television Service Manual Model: CE25MT2A-C (W.EUROPE) Service Ref. No. CE25MT2A-C-01 PRODUCT CODE: 111327415 ORIGINAL VERSION: Chassis No. EC5-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 Precautions
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 when certain that all the protective devices are installed properly, such as, control knobs, adjustment covers a service is performed on the primary of the converter or shields, barriers, isolation resistor-capacitor net- transformer of the set. -
Page 3: 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: Block Diagram
BLOCK DIAGRAM (Power supply routing) Service Manual-EC5 Chassis... -
Page 5: Circuit Description
CIRCUIT DESCRIPTION 1. POWER SUPPLY in 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 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 trans- Pin28: GND former T431 and drives the output transistor Q432. When Pin29: - Q432 becomes ON, an amplifying current flows directly to Pin30: V-deflection stop output(Stop:Lo)
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Page 7: Service Control
SERVICE CONTROL ADJUSTMENT B1 POWER SUPPLY ADJ. MAIN BOARD SW1901 SW1902 SW1903 SW1904 SW1905 SW1906 Prog+ Prog- Level+ Level- Function Memory IC801 AFT ADJ. TU-AGC ADJ. 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.
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Page 9: Circuit Alignment
CIRCUIT ALIGNMENT 10kΩ 0.002µF 75Ω 1kΩ Output probe Input probe VIF alignment SETTING Adjustment 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: Functions
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
610 253 2449 HOLDER AC CORD-GBR-D4VA 610 260 0148 HOLDER RC GBR-BLFA 610 265 4202 HOLDER DC-F3SCM 610 261 3032 SPRING-E7GC 645 003 9256 BADGE,SANYO*46.2X13.5L45 645 013 5521 FIXER HOOK,D11.5(PA) 610 224 5721 CRT CUSHION-B3MY-UK ACCESSORIES JXYC RC TRANSMITTER SKP10154... -
Page 13: List
CHASSIS ELECTRICAL PARTS LIST 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 spe- cial significance to product safety. - Page 14 Ref. No. Part No. Description Ref. No. Part No. Description Q1032 406 007 2106 TR JC546A 405 004 4205 TR 2SA608-E-CTV-NP 406 007 2007 TR JC546B 405 004 4809 TR 2SA608-F-CTV-NP 405 019 1909 TR 2SC536-E-NP 405 028 7909 TR 2SA608-G-CTV-NP 405 019 2708 TR 2SC536-F-NP Q612...
- Page 15 Ref. No. Part No. Description Ref. No. Part No. Description IC501 409 192 5709 IC LA7833 403 070 2606 CERAMIC 0.1U Z IC661 409 367 2809 IC BA178M09T C205 403 068 0409 CERAMIC 0.1U Z 409 366 7904 IC UPC78M09AHF 403 070 2606 CERAMIC 0.1U Z...
- Page 16 Ref. No. Part No. Description Ref. No. Part No. Description 403 179 3207 POLYESTER 0.015U J R1022 401 024 7400 CARBON 10K JA 1/6W C616 403 247 6604 CERAMIC 680P K R1023 401 020 2003 CARBON 4.7K JA 1/4W 403 275 8205 CERAMIC 680P K R1026...
- Page 17 Ref. No. Part No. Description Ref. No. Part No. Description R232 401 037 5202 MT-GLAZE 100 JA 1/10W R663 401 013 5301 CARBON 1.2K JA 1/4W R241 401 038 6307 MT-GLAZE 470 JA 1/10W R666 401 008 0205 CARBON 18 JA 1/2W R242 401 025 7409...
- Page 18 Ref. No. Part No. Description Ref. No. Part No. Description R892 401 038 6406 MT-GLAZE 4.7K JA 1/10W D1020 407 063 8309 ZENER DIODE MTZJ11C R895 401 037 6704 MT-GLAZE 1.2K JA 1/10W 407 158 3400 ZENER DIODE UZ-11BSC R896 401 038 5102 MT-GLAZE 3.9K JA...
- Page 19 Ref. No. Part No. Description Ref. No. Part No. Description 408 007 2506 DIODE BYW32 610 012 2222 TRAP,CERAMIC 5.74MHZ D634 407 007 7603 DIODE EU2 X871 645 015 8339 OSC,CRYSTAL 12MHZ 407 007 7801 DIODE EU2Z 645 018 9593 SC,CRYSTAL 12MHZ 408 007 2506 DIODE BYW32...
- Page 20 Service Manual-EC5 Chassis -20- SANYO ELECTRIC CO. LTD...
- Page 21 NOTES; 8. LIST OF REPLACEABLE DIODES. 1. RESISTORS SPECIFIED WITH RESISTANCE VALUE ARE "1/6DJ". 2. RESISTORS SPECIFIED WITH TYPE OF RESISTOR, TOLERANCE M (7ED00025) 1SS176, 1SS133, GMA01 AND RESISTANCE VALUE ARE "1/4". R (7DD00019) 1S1555, 1S2076, 1S2473, DS442, 1N4148 3. ALL CAPACITORS ARE 50WV RATING UNLESS OTHERWISE NOTED. AA (7DD00192) 1S1555, 1S2076, 1S2473, DS442, 1N4148, 1SS176, 1SS133, GMA01 4.
- Page 23 L105 Waveforms on ICs and Transistors R102/R104/R106 1/10GJ 1/10GJ 1/10GJ TUNE Q102/Q104/Q106 R105 Q101/Q103/Q105 QT0378(A:B): QT0378(A:B): QT0378(A:B): IC201-pin7 IC201-pin15 IC201-pin18 IC201-pin19 IC201-pin20 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 <CVBS out> <CVBS in> <B out>...
- Page 24 V out V-F/B H out...