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S/M No. : CP385P-010
Service Manual
51/55/63/71 Cm STEREO Color Television
MODEL CHASSIS
DTA-20 T1/T2/T3/T8 CP-385
DTA-21 T1/T2/T5/T9/Y1 CP-385
DTE-25 G6/G7 CP-785
DTE-28 G2/G6/G7/96/98/ CP-785
A6/A7/G8/B1
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr DEC. 1999
Service manual CP-385 / CP-785
Contents
1 - Main features ................................................................................................................................. 2
1-1 Specifications .................................................................................................................... 2
1-2 Channel table .................................................................................................................... 4
1-3 ATSS sorting method ........................................................................................................ 7
2 - Safety instruction .......................................................................................................................... 9
3 - Alignment instructions ................................................................................................................. 10
3-1 Microcontroller configuration : Service mode .................................................................... 10
3-2 Microcontroller configuration : Option................................................................................ 10
3-3 TV set Alignment ............................................................................................................... 10
4 - IC description ................................................................................................................................ 13
4-1 TDA936x TV signal processor - TXT with embedded m-Controller. .................................. 13
4-2 MSP3415D Multistandard Sound Processor ..................................................................... 21
4-3 TDA894xJ Stereo Audio Amplifier..................................................................................... 25
4-4 TDA835xJ Vertical Amplifier.............................................................................................. 26
4-4-1 TDA8357J............................................................................................................... 26
4-4-1 TDA8358J............................................................................................................... 28
4-5 TDA6107Q ........................................................................................................................ 29
4-6 24C08 8 Kbit EEPROM ..................................................................................................... 30
4-7 STR - F6653...................................................................................................................... 31
5 - Circuit description......................................................................................................................... 33
5-1 Block diagram.................................................................................................................... 33
5-2 IF ....................................................................................................................................... 37
5-3 Source switching ............................................................................................................... 39
5-4 m-Controller I/O pin configuration and function.................................................................. 39
5-5 Sound processing.............................................................................................................. 40
5-6 Sound amplification ........................................................................................................... 43
5-7 Vertical deflection .............................................................................................................. 43
5-8 Power supply (STR F6653) ............................................................................................... 45
5-9 TV start-up, TV normal run and stand by mode operations .............................................. 49
6 -Service parts list............................................................................................................................. 56
6-1 DTA-21Y1L(CP-385) ........................................................................................................ 56
6-2 DTE-28G2F(CP-785)......................................................................................................... 62
7 - Exploded view ............................................................................................................................... 69
8 - PCB Layout .................................................................................................................................... 89
9 - Circuit Diagram.............................................................................................................................. 91
Service manual CP 385 / CP785
1-1 Specifications
TV standard PAL - SECAM B/G D/K, PAL I/I, SECAM L/L'
Sound system NICAM B/G, I, D/K, L,
FM 2Carrier B/G, D/K
Power consumption 21" : 49 W approx.
28" : 75 W approx.
Sound Output Power 21" : 4.5W x 2 (at 60% mod, 10%THD)
28" : 7W x 2 (at 60% mod, 10%THD)
Speaker 20", 21" : 7W 8 ohm x2
25", 28" : 12W 8 ohm x2
Teletext system 10 pages memory FASTEXT (FLOF or TOP)
Aerial input 75 ohm unbalanced
Channel coverage Off-air channels, S-cable channels and hyperband
Tuning system frequency synthesiser tuning system
Visual screen size 20" : 48 cm
21" : 51 cm
25" : 59 cm
28" : 66cm
Channel indication On Screen Display
Program Selection 100 programmes
Aux. terminal EURO-SCART 1 : Audio / Video In and Out, R/G/B In, Slow and
Fast switching.
EURO-SCART 2 : Audio / Video In, SVHS In.
Audio-Video Jack on front of cabinet in common connection with
EURO-SCART 2.
Headphone jack (3.5 mm) on front of cabinet
Remote Control Unit R-40A01
21 Pin EURO-SCART 1 :
Pin Signal Description Matching value
1 Audio Output Right 0.5 Vrms, Impedance < 1 k, ( RF 54% Mod )
2 Audio Input Right 0.5 Vrms, Impedance > 10 k
3 Audio Output Left 0.5 Vrms, Impedance < 1 k, ( RF 54% Mod )
4 Audio Earth
5 Blue Earth
6 Audio Input Left 0.5 Vrms, Impedance > 10 k
7 Blue Input 0.7 Vpp