Daewoo DVN-14F6N User manual

Service Manual
TV/VCR IN ONE BOARD
CHASSIS : CN-140
NTSC-M SYSTEM
MODEL : DVN-14F6N
DVN-20F6N
DAEWOO ELECTRONICS CO., LTD.
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✔ Caution
: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).

CONTENTS
Specifications .................................................................................................. 1
Satety Checking After Servicing .................................................................... 2
1. Insulation resistance test
2. Dielectric strength test
3. Clearance distance
4. Leakage current test
Important Service Notes ................................................................................. 3
1. X-RAY radiation precaution
2. Safety precaution
3. Product safety notice
4. Service notes
General Adjustment ........................................................................................ 4
1. General
2. Vertical height adjustment
3. Focus adjustment
4. RF AGC adjustment
5. High voltage check
6. X-RADIATION protection circuit test
7. White valance adjustment
8. Convergence magnet assembly positioning
Leadless(chip) Instruction &
Cleaning and rubrication of deck mecanism ................................ 7
1. Leadless(chip) component removal instruction
2. Leadless(chip) component identification
3. Cleaning and rubrication of deck mechanism
Mechanical disassembly(DECK) .................................................................... 9
1. Top view
2. Bottom view
3. F/L mechanism view
4. General removal view
5. Mechanical checks/Gear alignment
6. Tention checks
Mechanical Adjustments ............................................................................... 22
Shape & Equipment of DVN-14/20F6N ......................................................... 24
1. DVN-14F6N/DVN-20F6N
2. Panel view
3. Remote controller
Electrical Adjustments ................................................................................... 29
1. Servo
2. Audio
3. Video

Signal Flow ..................................................................................................... 35
1. Video & Audio
2. Power circuits
3. Deflection circuits
4. U-COM circuits
5. Channel selection and memory
6. Servo/Syscon circuit operation
7. Normal audio circuit operation
8. Video circuit operation
Important IC¡¡flfl s Operation .............................................................................. 43
1. IY03(LA7411)
2. IY02(LC89960)
3. IY01(LA7423A)
4. IU01(BA7790LS)
5. IN05(BA6209)
6. IN03(MC4558C)
7. I503(TC4066BP)
8. I301(TA8445K)
9. IN01(Syscon:TMP91C642AN-3178)
10. I701(Timer:M37267M6-101SP)
11. I501(Chroma IC:M52335SP-600)
Important Signal WaveForms ....................................................................... 80
Troubleshooting According to
Cause & Symptom ................................................................................. 83
1. Power supply unit
2. Vertical, horizontal unit
3. Servo/Syscon unit
4. Video unit
5. Audio unit
Electrical Parts List ..................................................................................... 100
1. Standard part number coding
2. Parts list
Block Diagram ............................................................................................. 128
Connection Diagram ................................................................................... 129
Schematic Diagram ..................................................................................... 130
Printed Circuit Boards ................................................................................ 135
Exploded View ............................................................................................. 138

Format : VHS standard
Playback System : 2 rotary heads, helical
scanning system
Luminance : FM azimuth
recording
Color Signal :Converted
sub-carrier
phase shift
recording
Video Signal System : NTSE-type color signal'
Audio Track : 1 track
Tape Width : 12.65 mm (1/2 inch)
Tape Speed : (SP) : 33.35 mm/s (1.5/16 ips)
(LP) : 16.67mm/s (21/32 ips)
(SLP) : 11.12 mm/s (7/16 ips)
Maximum Recording Time : (SLP) : 480min. with T-160
Videocassette
Power Source : 120V AC, 60Hz
Power Consumption : (14") : 60W
(20") : 75W
Input Level : Video : VIDEO IN jack(RCA)
1.0Vp-p, 75Ωunbalanced
Audio : AUDIO IN jack (RCA)
-3.8dBm. over 100K OHM
unbalanced
TV Tuner : VHF input CH2-CH13
Cable channels
"A" - "W"
75Ωunbalanced
UHF input CH14-CH 69
Video Horizontal
Resolution : More than 220 lines
Audio Frequency : SP : 100 Hz-10KHz
LP : 100Hz-7KHz
SLP : 100Hz-5KHz
Signal-to-Noise Ratio : Video : better than 43 dB (SP)
Audio : better than 36 dB (with TV)
Operating Temperature : 5°C-40°C
Weight : (14") : 17Kg/(20") : 25Kg
Dimensions : (14") : 379x402x369
(20") : 498x495x464
Provided Accessories : Remote control unit
Picture Tube : (20"/14") A48JLL40x02
A34JLL40x01
Sound Output Power : Above 1.2W non distortion/
SPEAKER
* Design and apecifications are subject to change without
notice. our legal obligations.
■■SPECIFICATIONS
1

2
• Safety Check after Servicing
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have
been returned to original positions. Afterwards, perform the following tests and confirm the specfied values in order to veri-
fy compliance with safety satandards.
1. Insulation resistance test
Confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed parts of
the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks,
etc.). See table below.
2. dielectric strength test.
Confirm specified dielectric or strength or greater between power cord plug prongs and exposed accessible parts of the
set(RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks,
etc.) See table below.
3. Clearance distance
When replacing primary circuit components, confirm
speckfied clearance distance (d), (d") between soldered
terminals, and between terminals and surrounding metalic
parts. see table below.
Table 1 : Rating for selected areas
Note : This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and
locality.
4. Leakage current test
confirm specified or lower leakage current between B (earth ground, power cord plug prongs) and externally exposed
accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, ear-
phone jacks, etc.)
Measuring Method : (Power ON)
Insert load Z between B (earth ground, power cord plug
prongs) and exposed accessible parts. Use and AC volt-
meter to measure across both terminals of load Z.
See figure and following table.
Table 2 : Leakage current ratings for selected areas
Note : This table unofficial and for reference only. Be sure to confirm the precise values for your particular coyntry and
locality.
AC Line Voltage Region Insulation Dielectric Clearance
Resistance Strength Distance (d), (d')
100V Japan ≥1MΩ500 V DC 1kV 1 minute ≥3 mm
110 to 130V USA & Canada --- 900V 1 minute ≥3.2mm
≥6mm(d)
* 100 to 250V South America ≥10 MΩ/500 V DC 4 kV 1 minute ≥8mm(d')
(z:Power cord)
AC Line Voltage Region Load Z Leakage Current (i) Earth Ground
(B) to :
100V Japan i ≤1mA rms Exposed accessible parts
110 to 130 V USA & Canada i ≤0.5 mA rms Exposed accessible parts
100 to 130 V South America i ≤0.7 mA peak Antenna earth terminals
i ≤2mA dc
200 to 250 V i ≤0.7 mA peak Other terminals
i ≤2mA dc
Fig. 1
Fig. 2
1kΩ
2kΩ
50kΩ
1.5kµF
1.5kΩ