Daewoo DTC-14 - User Manual

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Summary

Important Service Notes

X-ray Radiation Precaution

Safety measures for high voltage and X-radiation protection circuits.

Safety Precautions

Essential safety warnings for servicing, including isolation transformers and CRT handling.

Product Safety Notice

Importance of using identical replacement parts for safety characteristics.

Service Notes

Tips for replacing parts and handling components to maintain safety.

Alignment Instructions

AFT Adjustment

Procedure for adjusting Automatic Fine Tuning using a signal generator.

AGC Adjustment

Steps to adjust Automatic Gain Control using a pattern generator.

Screen Adjustment

Procedure for adjusting screen volume for optimal horizontal lines.

White Balance Adjustment

Method to adjust RGB color for proper white balance.

Focus Adjustment

How to adjust focus volume on FBT for resolution.

Vertical Geometry Adjustment

Steps for adjusting vertical center and size on the screen.

Horizontal Center Adjustment

Procedure for adjusting picture centering with H-CENTER keys.

Data Preset Adjustments

Steps to enter service mode and adjust data presets.

Factory Outgoing Mode

Procedure to set the TV to factory outgoing status.

Remote Control and Service Mode Operations

Remote Control Functions

Overview of remote control buttons and their functions.

Service Mode Entry

Instructions for entering and exiting the service mode using the remote.

Service Mode OSD

Explanation of the Service Mode On-Screen Display parameters.

This document is a service guide for Daewoo Colour Televisions, specifically models DTC-14, DTC-20, and DTC-21, all utilizing the CP-002 chassis. It provides essential information for servicing and understanding the device.

Function Description

The Daewoo Colour Televisions are designed for displaying video and audio content. They support multiple TV standards and offer various features for user interaction and picture/sound adjustment. The guide details alignment instructions for optimal performance, including AFT (Automatic Fine Tuning), AGC (Automatic Gain Control), SCREEN, WHITE BALANCE, FOCUS, and GEOMETRY adjustments. It also outlines the process for entering and utilizing the "Service Mode" for advanced data preset adjustments and factory outgoing mode.

Important Technical Specifications

Chassis: CP-002

Models:

DTC-14 V1/V3/V4/V5/U1 TM
DTC-20 V1/V3/V4/V5/U1 TM
DTC-21 V1/V3/V4/U1/U3 TM

TV Standard: PAL/SECAM-B/G, D/K, I, H, NTSC-3.58/4.43, NTSC-5.5

Mains Voltage: 100~250V AC, 50/60Hz

Power Voltage:

14": 73W
20": 78W
16": 75W
21": 86W

Sound Output:

2 Speaker (at any MOD. 10% THD)
5W + 5W (TWITTER 2.5W + 2.5W)

Speaker: 2 Speaker: 7.5W 4 ohm

Memory Channel: 100 channels

Reception Channel Unit:

VHF-L: CH2 - CH4
VHF-H: CH5 - CH12
Cable Band: CHS1' - CHS3', CHS1 - CHS20
Hyper Band: CHS21 - CHS40
UHF: CH21 - CH69

Remote Control:

VG: R-28B04
TM: R-28B03

X-ray Radiation: The nominal high voltage is 25.5kV (20"/21") & 23.5kV (14") at zero beam current. It must not exceed 28kV (20"/21") & 26kV (14"). The device includes an X-RADIATION PROTECTION circuit.

Usage Features

The televisions offer a range of user-controlled functions via the remote control:

TV Mode (VG Remote):

Power ON/OFF
Number 0-9 for channel selection
Normal/OK button
AV input selection
PR (Program/Channel) UP/DOWN (Cursor UP/DOWN)
Volume UP/DOWN (Cursor RIGHT/LEFT)
Menu access
Mute
Recall (previous channel)
Sleep timer
Move (Edit mode only)
Skip (Edit mode only)
TV/TEXT toggle
Delete (Edit mode only)
Mode (Picture System Change)

Teletext Mode (TM Remote):

Power ON/OFF
Number 0-9 for page selection
Index
Mix
Page UP/DOWN
Subpage
Menu
Hold
Mute
Reveal
Size
Cancel
Green Key, Red Key, Cyan Key, Yellow Key for teletext functions

Picture and Sound Adjustments:

16:9 Mode: Adjusts the aspect ratio.
ZOOM Mode: Magnifies a portion of the screen.
Blue Back (ON/OFF): Controls the blue screen feature when no signal is present.
Local Key Menu Control: Allows menu navigation using physical buttons on the TV.
Arrow Puzzle Game: An integrated game.
Monitor Out: Provides video output for external monitors.
Simple SCART: Supports SCART connectivity.
Twitter Speaker: Refers to the specific speaker configuration.
OSD MESH: On-Screen Display mesh.
TELETEXT: 8-page teletext with TOP/FLOF mode.

Maintenance Features

The service guide emphasizes several important safety and maintenance aspects:

X-ray Radiation Precaution:

High voltage must be kept within specified limits (25.5kV nominal, never exceeding 28kV for 20"/21" models; 23.5kV nominal, never exceeding 26kV for 14" models).
High voltage must be checked during servicing using the "HIGH VOLTAGE CHECK" procedure.
The X-RADIATION PROTECTION circuit must be checked for proper functioning.
Only specified replacement picture tubes should be used to maintain X-ray radiation protection.

Safety Precaution:

An isolation transformer must be used during servicing due to the floating chassis design.
The picture tube anode must always be discharged before handling. Shatterproof goggles are recommended.
All protective devices (nonmetallic control knobs, insulating covers, shields, isolation resistor-capacitor network) must be reinstalled correctly after servicing.
An AC leakage current check must be performed on exposed metallic parts before returning the set to the customer.

Product Safety Notice:

Certain electrical and mechanical parts are critical for safety and must be replaced only with identical types specified in the parts list (identified by shading on schematic diagrams and parts lists).
Using substitute parts without the same safety characteristics may create X-ray radiation or other hazards.

Service Notes:

When replacing parts or circuit boards, lead wires should be clamped or bent before soldering.
High wattage resistors (metal oxide film resistors) should be kept at least 1/2 inch away from the circuit board.
Wires should be kept away from high voltage or high-temperature components.

Service Mode Access:

Select CH number 91.
Adjust sharpness to minimum.
Exit from Menu mode.
Quickly press the key sequence: Red -> Green -> Menu on the user remote control.
The "Service Mode OSD" will appear. To exit Service Mode, press "Power off."

The service mode allows adjustment of parameters like R BIAS, G BIAS, B BIAS, R DRIVE, G DRIVE, B DRIVE, V CENTER, V SIZE, H CENTER, VCO, FINE, AGC, POW LAST OFF, SUB BRI, PR, BRIGHT, CONTRAST, and COLOUR.