CP-370.pdf part of Daewoo CP-370 CP-370.pdf, Daewoo Ņhassis CP CP-370 CP-370.pdf text manual preview

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Service Manual
38 / 48 / 51 Cm Mono Colour Television
CHASSIS : CP-370

MODEL : 14Q1/20Q1/21Q1
14Q2/20Q2/21Q2
14Q3/20Q3/21Q4
14T1/20T1/21T1
14T2/20T2/21T2
14T3/20T3

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DAEWOO ELECTRONICS CO., LTD.
CONTENTS

Specifications ................................................................................................................ 1
Safety Instruction ......................................................................................................... 2
Circuit block Diagram ................................................................................................. 3
Alignment Instructions ............................................................................................... 4
IC Description ................................................................................................................ 7
Circuit Description ....................................................................................................... 31
PCB Layouts
PRINTED CIRCUIT BOARDS .................................................................................... 38
SCHEMATIC DIAGRAM ............................................................................................. 39

Trouble Shooting Charis ............................................................................................. 40
Important IC Voltage Charts .............................................................................................. 47

Electrical Part List............................................................................................................... 49

Q Model T Model Difference Part List ............................................................................... 64

Inch difference Part List ..................................................................................................... 65

Mechanical Exploded View and Part List ......................................................................... 66
Specifications
Q : 1SPEAKER MODEL, T : 2SPEAKER MODEL
VM : WITHOUT TXT. MODEL, TM : WITH TXT. MODEL

TV Standard PAL/SECAM-B/G, D/K, I, H, NTSC-3.58/4.43
Mains Voltage 100~250V AC, 50/60Hz
Power Consumption 14"Q = 69W, 14"T = 74W
20"Q = 79W, 20"T = 84W
21"Q = 79W, 21"T = 84W
Sound output . 1 Speaker : 3W( at 80% MOD. 10% THD)
. 2 Speaker : 4W + 4W( at 80% MOD. 10% THD)
Speaker . 1 Speaker : 3W, 16 ohm
. 2 Speaker : 7.5W, 8 ohm(2EA)
Antenna 75 ohm unbalanced
Impedance 300 ohm balanced with supplied balun
Tuning system Voltage Synthesize Tuning System
Memory channel VM : 100 channels, TM : 70 channels
Reception VHF - L : CH2 - CH4
channel Unit VHF - H : CH5 - CH12
Cable Band : CHS1' - CHS3', CHS1 - CHS20
Hyper Band : CHS21 - CHS40(option)
UHF : CH21 - CH69
Remote control VM : R-28B04, TM : R-28B03
Screen size 14" : 34cm (A34JLL 90 02)
20" : 48cm (A48JLL 90 02)
21" : 51cm (A51JLL 90 02)
Weight 14" : 9.5Kg(set)
20" : 16.5Kg(set)
21" : 20.5Kg(set)
Indication On-Screen Display
- MENU
Picture(Bright, Color, Contrast, Sharpness, TINT)
TIMER(CLOCK, WAKE-UP-TIME, ACTIVATE, WAKE-UP-PROG)
LANGUAGE
PRESET
EDIT
SLEEP TIMER
AV
SOUND MUTE
VOLUME CONTROL

1
Safety Instruction

WARNING: Before servicing this chassis, read the "X-RAY RADIATION precaution", "safety
precaution" and "product safety notice" below.

X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially voltage should be checked. It is recommended
hazardous X-RAY RADIATION.To avoid such the reading of the high voltage recorded as a part
hazards, the high voltage must not exceed the of the service records. it is important to use an
specified limit. The nominal value of the high accurate and reliable high voltage meter.
voltage of this receiver is 22-23kv(14"), 25- 2. The only source of X-RAY Radiation in this TV
26kv(20", 21") at max beam current. The high receiver is the picture tube. For continuous
voltage must not, under any circumstances, RADIATION protection, the replacement tube
exceed 27.5kv (14", 20"), 29.0kv(21"). must be exactly the same type tube as specified
Each time a receiver requires servicing, the high in the parts list.

SAFETY PRECAUTION
1. Potentials of high voltage are present when this 2. If any Fuse in this TV receiver is blown, replace it
receiver is operating. Operation of the receiver with the FUSE specified in the Replacement
outside the cabinet or with the back cover Parts List.
removed involves a shock hazard from the 3. When replacing a high wattage resistor(oxide
receiver. metal film resistor) in circuit board, keep the
1) Servicing should not be attempted by anyone resistor 10mm away from circuit board.
who is not thoroughly familiar with the 4. Keep wires away from high voltage or high
precautions necessary when working on high- temperature components.
voltage equipment. 5. This receiver must operate under AC260 volts,
2) Always discharge the picture tube to avoid the 50Hz/60Hz. (AC 100~250 volts, 50/60Hz)NEVER
shock hazard before removing the anode cap. connect to DC supply or any other power or
3) Discharge the high potential of the picture tube frequency.
before handling the tube. The picture tube is
highly evacuated and if broken, glass
fragments will be violently expelled.

PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis identified by designated symbol on the parts list.
have special safety-related characteristics. Before replacing any of these components, read the
These characteristics are often passed unnoticed parts list in this manual carefully. The use of
by a visual inspection and the X-RAY RADIATION substitute replacement parts which do not have the
protection afforded by them cannot necessarily be same safety characteristics as specified in the parts
obtained by using replacement components rated list may created X-RAY Radiation.
for higher voltage, wattage, etc. Replacement parts
which have these special safety characteristics are
identified in this manual and its supplements,
electrical components having such features are

2
Alignment Instructions
1. AFT

1.1 Standard B/G,D/K,I
1) Set a Signal Generator with
- RF FREQUENCY = 38.9 MHz,
- RF OUTPUT LEVEL = 80 5 dBuV
- System = PAL / SECAM - B/G, D/K, I
NTSC - 3.58/4.43
2) Connect the Signal Generator RF Output to P101 (Tuner IF Output).
There must be no signal input to the tuner.
3) Press the "AFT" KEY and wait until the TV screen display "AFT OK".

2. AGC
1) Set a Pattern Generator with RF LEVEL 63