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Service Manual
Colour Television
CHASSIS: CM-900
Model: DTC-25G1VM (NO TXT)
DTC-29G1VM (NO TXT)
DTC-25G3VMR (NO TXT)
DTC-25G4VMS (NO TXT)
DTC-25G7VM (NO TXT)
DTC-29G1TM (TXT)
DTC-25G1TM (TXT)




DAEWOO ELECTRONICS CO., LTD.



SPECIFICATIONS ................................................................................................................................ 2
SAFETY INSTRUCTIONS .................................................................................................................... 3
BLOCK DIAGRAM ............................................................................................................................... 4
ALIGNM ENT INSTRUCTIONS ............................................................................................................. 5
,, C M -900 C HA SS IS A D JU STM E NT .................................................................................................... 5
,, SE R VIC E M O D E ................................................................................................................................ 11
,, O TH E R S ER V ICE FU N CTIO N .......................................................................................................... 12
,, TE ST S IG N AL SE LEC TIO N .............................................................................................................. 13
,, SE R VIC E R E M O TE C O N TR O LLER ................................................................................................. 14
PARTS LIST ......................................................................................................................................... 15
DIFFERENCE PARTS LIST ................................................................................................................. 29
PRINTED CIRCUIT BOARDS .............................................................................................................. 31
EXPLODED VIEW
,, D TC -25G 1VM .................................................................................................................................... 32
,, D TC -29G 1VM .................................................................................................................................... 33
,, D TC -29G 3VM R .................................................................................................................................. 34
,, D TC -29G 4VM S .................................................................................................................................. 35
,, D TC -2987V M ..................................................................................................................................... 36
SCHEM ATIC DIAGRAM ....................................................................................................................... 37





SPECIFICATIONS

STANDARD MODEL DTC-25G1VM DTC-29G1VM
TV STAN DA RD PA L/S E CA M -B/G , D /K, I, H , NTSC -4.43/3.58
M ains Voltage A C 110 - 250V, 50/60H z
Pow er Consum ption 120W 145W
Sound O utput Pow er 10W + 10W (AT 100% M O D , 10% TH D)
Speaker 12W 8 O hm s (Norm al) X 2E A
Antenna Im pedance 75 O hm unbalanced (DIN Standard)
Tuning S ystem Voltage Synthesize Tuning System
Num ber of Program 100 Channels
Reception Channel V HF - L : I1 - S 8 C H (43.25 - 154.25M H z)
V HF - H : S 9 - S41 C H (161.25 - 463.25M Hz)
U HF : C13 - C57 C H (471.25M H z - 863.25M Hz)
Rem ote C ontrol U nit R -33C
CRT 25 Inch 29 Inch
W eight 33K g (S ET) 45K g (SE T)
Indication P rogram N o. D isplay
Tuning Voltage D isplay
Video Input Display
A nalog Control Display
(Color, B right, Contrast, S harpness, Tint, B/B -B ack/Blue)
Volum e Control D isplay
(Bass, Treble, B alance)
P reset D isplay
C lock D isplay
N TS C state Display
O N/O FF Tim er Display
Language D isplay





SAFETY INSTRUCTIONS

NOTE
BEFO R E SERVIC IN G TH IS C H ASSIS, READ TH E "X-R AY R ADIATIO N PREC AUTIO N ",
"SAFETY PR ECAU TION " AND "PRO D UC T SAFETY N O TICE" BELO W.



X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially haz- reading of the high voltage recorded as a part of
ardous X -R AY R A DIATIO N .To avoid such hazards, the service records. it is im portant to use an accu-
the high voltage m ust not exceed the specified lim it. rate and reliable high voltage m eter.
The nominal value of the high voltage of this receiver is 2. The only source of X-R AY R adiation in this TV
26.5kv(25"), 29.5kv(29") at max beam current. receiver is the picture tube.
The high voltage must not, under any circumstances, For continuous R AD IATIO N protection, the
exceed 29.0kv (25"), 31.5kv(29"). replacem ent tube m ust be exactly the sam e type
Each tim e a receiver requires servicing, the high tube as specified in the parts list.
voltage should be checked. It is recom m ended the


SAFETY PRECAUTION

1. P otentials of high voltage are present w hen this receiver 2. If any Fuse in this TV receiver is blow n, replace it w ith
is operating. O peration of the receiver outside the cabi- the FU S E specified in the R eplacem ent P arts List.
net or w ith the back cover rem oved involves a shock 3. W hen replacing a high w attage resistor(oxide m etal film
hazard from the receiver. resistor) in circuit board, keep the resistor 10m m aw ay
1) S ervicing should not be attem pted by anyone w ho is from circuit board.
not thoroughly fam iliar w ith the precautions necessary 4. K eep w ires aw ay from high voltage or high tem perature
w hen w orking on highvoltage equipm ent. com ponents.
2) A lw ays discharge the picture tube to avoid the shock 5. This receiver m ust operate betw een A C 110~250volts,
hazard before rem oving the anode cap. 50H z/60H z. N E V E R connect to D C supply or any other
3) D ischarge the high potential of the picture tube before pow er or frequency.
handling the tube. The picture tube is highly evac
uated and if broken, glass fragm ents w ill be violently
expelled.


PRODUCT SAFETY NOTICE

M any electrical and m echanical parts in this supplem ents, electrical com ponents having such fea-
chassis have special safety-related characteristics. tures are identified by designated sym bol on the parts
These characteristics are often passed unnoticed by list. Before replacing any of these com ponents, read
a visual inspection and the X-R AY R AD IATIO N the parts list in this m anual carefully.
protection afforded by them cannot necessarily be The use of substitute replacem ent parts w hich do not
obtained by using replacem ent com ponents rated for have the sam e safety characteristics as specified in
higher voltage, w attage, etc. the parts list m ay created X-R AY R adiation.
R eplacem ent parts w hich have these special safety
characteristics are identified in this m anual and its



BLOCK DIAGRAM





ALIGNMENT INSTRUCTIONS

,, CM-900 CHASSIS ADJUSTMENT
Application