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Colour Television
Service Manual
Model CE28SN3-C
Service Ref.No.: CE28SN3-C-12
PRODUCT CODE: 111328207
ORIGINAL VERSION: Chassis No.: EB4-A (MKII)
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 specifications for the
design specifications
Contents
Safety precautions/Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Cabinet Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Service control adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Circuit alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Important notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Special Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-20
Part No. SKSM0280
F2ZHY
November 1999
28SN3
CE
-C
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Related Manuals for Sanyo CE28SN3-C
Summary of Contents for Sanyo CE28SN3-C
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Page 1: Table Of Contents
Colour Television 28SN3 Service Manual Model CE28SN3-C Service Ref.No.: CE28SN3-C-12 PRODUCT CODE: 111328207 ORIGINAL VERSION: Chassis No.: EB4-A (MKII) 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/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 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. Audio Audio Unit SIF Unit EB4 MKII chassis... -
Page 4: Circuit Description
CIRCUIT DESCRIPTION 1. POWER SUPPLY chroma signals, demodulated in IC201, and output from The power supply circuit of the EB4-A chassis is pin30 (R-Y) and pin31 (B-Y). These chroma signals pass composed of a rectifier smoothing circuit, an oscillation through the 1H delay line circuit (IC271), and they are circuit, a control circuit and an output rectifier circuit. - Page 5 6. HORIZONTAL OUTPUT Pin26: IREF A horizontal oscillation signal is output from pin37 of Pin27: Odd/Even output IC201 and switches the drive transistor Q431. This Pin28: GND switching signal is current amplified by the drive Pin29: - transformer T431 and drives the output transistor Q432. Pin30: V-deflection stop output When Q432 becomes ON, an amplifying current flows Pin31: RGB REF...
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Page 6: Cabinet Disassembly
CABINET DISASSEMBLY CABINET BACK DISASSEMBLY 1. Remove 10 screws(A). 2. Pull out the cabinet back. 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. EB4 MKII chassis... -
Page 7: Service Control Adjustment
SERVICE CONTROL ADJUSTMENT B1 POWER SUPPLY ADJUSTMENT 6. Set screen VR for one colour to be just visible. 1. Set VR641 to be mechanical centre before pressing [BIAS VR ADJUSTMENT] the main switch. 7. By using VR601, VR611 or VR621, adjust line to be 2. -
Page 8: Circuit Alignment
CIRCUIT ALIGNMENT 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 20dB 0dB=176mVrms/75 SIF alignment SETTING Waveform Adjustment... -
Page 9: Important Notice
INITIALIZATION (Important Notice) When you replace a memory IC (IC802), it is necessary to initialise the IC as following step. A. Initialization Press and hold the ( ) normalization button on the remote control handset and press the ( ) programme + button on the TV set. -
Page 10: Special Function
SPECIAL FUNCTION 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 prohibition of presetting. Start up programme position ITEM-1 SET ->... -
Page 11: Cabinet Parts List
SERVICE REF. NO. CE28SN3-C-12 CABINET PARTS LIST Note: Parts order must contain Service Ref. No., Part No., and descriptions. SURROUND BASS -/-- MENU Ref. No. Part No. Description Ref. No. Part No. Description CABINET PARTS 1KB0CAM0458-D ASSY,CABINET FR-F2ZH SKTBUM0058AE UNSP BTN UNIT-F2ZE-A... -
Page 12: Electrical Parts List
Note: Parts order must contain Service Ref. No., Part No., and descriptions. Ref. No. Part No. Description Service Ref No.: CE28SN3-C-12 Read description in the Capacitor and Resistor as follows: Chassis construction CAPACITOR CERAMIC 100P K 50V... - Page 13 Ref. No. Part No. Description Ref. No. Part No. Description 405 004 4205 TR 2SA608-E-CTV-NP ASSY,PWB,SIF 1AA0B10H0300A 405 004 4809 TR 2SA608-F-CTV-NP 405 028 7909 TR 2SA608-G-CTV-NP TRANSISTOR Q3811 405 014 4519 TR 2SC2412KT146/R CAPACITOR C701 403 074 5712 CERAMIC 560P K INTEGRATED CIRCUIT C711...
- Page 14 Ref. No. Part No. Description Ref. No. Part No. Description C3477 403 039 2104 ELECT 47U M 6.3V MISCELLANEOUS C3480 403 039 2104 ELECT 47U M 6.3V J1251 401 037 5014 MT-GLAZE 0.000 ZA 1/10W C3481 403 039 2104 ELECT 47U M 6.3V J3459...
- Page 15 Ref. No. Part No. Description Ref. No. Part No. Description Q872 406 007 2106 TR JC546A C1028 403 041 9405 ELECT 10U M Q873 406 007 2106 TR JC546A C1029 403 049 4204 ELECT 10U M Q874 406 007 2106 TR JC546A C1031 403 033 4510...
- Page 16 Ref. No. Part No. Description Ref. No. Part No. Description C235 403 008 7416 CERAMIC 10P D C644 403 148 0701 ELECT 2200U M C271 403 069 1712 CERAMIC 1000P K C645 403 158 1309 ELECT 2200U M C272 403 069 1712 CERAMIC 1000P K C651...
- Page 17 Ref. No. Part No. Description Ref. No. Part No. Description R1013 401 012 4543 CARBON 100 JA 1/4W R155 401 037 5410 MT-GLAZE 1K JA 1/10W R1014 401 027 6628 CARBON 75 JA 1/6W R156 401 037 5410 MT-GLAZE 1K JA 1/10W R1015 401 038 6416 MT-GLAZE...
- Page 18 Ref. No. Part No. Description Ref. No. Part No. Description R432 401 037 5410 MT-GLAZE 1K JA 1/10W R685 401 025 8228 CARBON 22K JA 1/6W R433 401 007 1134 CARBON 1K JA 1/2W R800 401 016 3849 CARBON 2.2K JA 1/4W R434 401 067 9201...
- Page 19 Ref. No. Part No. Description Ref. No. Part No. Description R888 401 037 5212 MT-GLAZE 100 JA 1/10W L642 645 002 4511 CORE,PIPE R889 401 037 5212 MT-GLAZE 100 JA 1/10W L643 645 002 4511 CORE,PIPE R891 401 038 6416 MT-GLAZE 4.7K JA 1/10W L871...
- Page 20 All information in this manual is correct at the start of J237 401 037 5014 MT-GLAZE 0.000 ZA 1/10W production. Sanyo reserves the right to modify J238 401 037 5014 MT-GLAZE 0.000 ZA 1/10W components and procedures in order to comply with...