DAEWOO DVN-14F6N, DVN-20F6N Service Manual
Service Manual
TV/VCR IN ONE BOARD
CHASSIS : CN-140
NTSC-M SYSTEM
MODEL : DVN-14F6N
DVN-20F6N
DAEWOO ELECTRONICS CO., LTD.
✔
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, 75Ω unbalanced
Audio : AUDIO IN jack (RCA)
-3.8dBm. over 100K OHM
unbalanced
TV Tuner : VHF input CH2-CH13
Cable channels
"A" - "W"
75Ω unbalanced
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") : 379x402
x369
(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 verify 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, earphone jacks, etc.)
Measuring Method : (Power ON)
Insert load Z between B (earth ground, power cord plug
prongs) and exposed accessible parts. Use and AC voltmeter 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
1. X-RAY RADIATION PRECAUTION
1)Excessive high voltage can produce potentially hazardous X-RAY RADIATION to avoid such hazards, the
high voltage must not be above the specified limit. The
nominal value of the high voltage of this receiver is
24.4kv (27.5kv) at zero beam current (mininum
brighrness) under a 120V AC power source. The high
voltage must not, under any circumstance, exceed 27kv
(28.5kv). Each time a receiver requires servicing, the
high voltage should be checked following the HIGH
VOLTAGE CHECK procedure on page 4 of this manual.
It is recommend as parts of the servuce record. It is
important to use an accurate and reliable high voltage
meter.
2) This receiver is equipped with X-RADITION PROTECTION circuit which prevents the receiver from producing
an excessively high voltage even of the B+ vlotage
increases abnormally. Each time the receiver is serviced,
X-RADIATION PROTECTION circuit must be checked to
determine that the circuit is properly functioning, following
the X-RADIATION PROTETION CIRCUIT CHECK procedure on page 4 of this manual.
3) The only source of X-RAY RADIATION in this TV receiver is the picture tube. For continued X-RAY RADIATION
PROTECTION, the replacement tube must be exactly
the same type tube as specified in the parts list.
4) Some parts in the receiver have special safety-related
characteristics for X-RAY RADIATION PROTECTION.
for continued safety, parts replacement should be undertaken only after referring to the PRODUCT SAFETY
NOTICE below.
2. SAFETY PRECAUTION
WARNING : Service should not be attempted by anyone
unfamiliar with the necessary precautions on this receiver.
The following are the necessary precaution to be observed
before servicing.
1) Since the chassis of this receiver has hazardous potential to ground whenever to receiver is plugged in (floating
chassis), an isolation transformer must be used during
service to avoid shock hazard.
2) Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube.
The picture tube is highly evacuated and if broken, glass
fragments will be violently expelled. Use shat-ter-proof
goggles and keep picture tube away from the body while
handling.
3) When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place,
such as; non-metallic control knobs, insulating covers,
shields, isolation resistor-capacitor network etc.
4) Before returning the set to the customer, always perform
an AC leakage curent check on the exposed metallic
parts of the cabinet, such as antennas, terminals, screwheads, metal overlays, control shafts etc. to be sure the
set is safe to operate without danger of electrical shock.
(Plug the AC line cord directly into a 120V AC outlet do
not use a line isolation transformer during this check).
Use an AC voltmeter having 5000 ohms per volt or more
sensitivity in the following manner.
Connect at 1500 ohm watt resistor, paralleled by a 0.15
mfd, AC type capacitor, between a known good earth
ground (water pipe, conduit, etc.) and the exposed metalic
parts, one at a time. Measure the AC voltage across the
combination of 1500 ohm resistor and o.15 mfd capacitor.
Reverse the AC plug at the AC output and repeat AC voltage measurements for each exposed metallic part. Voltage
messured much not exceed 0.3 volts RMS. this corresponds to 0.2 milliamp AC. Any value exceeding this limit
constitutes a potential shock hazard and must be corrected
immediately.
3. PRODUCT SAFETY NOTICE
many electrical and mechanical parts in this chassis have
special safety-related characteristics. These characteristics
are often passed unnoticed by a visual inspection and the
protection afforded by them cannot necessarily be obtained
by using replacement components rated 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 identified by shading on the schematic diagram and the
parts list.
Before replacing ant of these componrnts, read the parts list
in this manual carefully. The use of substitute replacement
parts which do not have the same safety characteristics as
specified in the parts list may create X-ray radiation or other
hazards.
4. SERVICE NOTES
1) Which replacing parts or circuit boards, clamp the lead
wires to terminals before soldering.
2) When replacing a high wattage resistor (metal oxide film
resistor) in the circuit board, keep the resistor min 1/2 inch
away from circuit board.
3) Keep wires away from high voltage or high temperature
components.
■■
IMPORTANT SERVICE NOTES
3
4
1. GENERAL
In the majority of cases, color television will need only slight
touch-up adjustment upon installation. Check the basic
characteristics such as height, focus and sub-bright.
Observe the picture for good black and white details without
objectionable color shading. If color shading is evident,
demagnetize the receiver. If color shading still persists, perfor purity and convergence adjustments. this should be all
that is necessary to achieve optimum receive performance.
2. VERTICAL HEIGHT ADJUSTMENT
1) Tune in an active channel.
2) Adjust brightness and contrast control for a good picture.
3) Adjust vertical height control (R304) for approximately
one half inch over scan at top and bottom of picture
screen.
3. FOCUS ADJUSTMENT
1) Tune in an active channel.
2) Adjust brightness, sharpness and contrast controls for a
good picture, sharp scanning lines and/or sharp picture.
4. RF AGC ADJUSTMENT
1) Tune in an active channel.
2) Using the attenuator, apply the signal of 60dBµV to the
Antena input terminal
3) Turn RF AGC control (R106) so that it is 1.0V±0.3V
lower than maximum voltage.
5. HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked verify
that the receiver is operating within safe and efficient design
limitations as specified :
1) Operate Receiver for at least 15 minutes at 100-140V
AC line.
2) Set brightness, sharpness, contrast and color controls to
minimum position (Zero beam).
3) Connect an accurate high voltage meter to CRT anode.
The reading should be as follows.
If a correct reading connot be obtaines, check circuitry for
malfunctioning components.
6. X-RADIATION PROTECTION CIRCUIT TEST
When service has been performed on the horizontal deflection system, high voltage system or B+ system, the X-RADIATION PROTECTION circuit must be tested for proper
operation as follows:
1) Operate receiver for at least 15 minutes at 120V AC line.
2) Confirm high voltage protector when R409 of power
PCB is connected to 30kΩ(1/4w) in parallel.
3) If high voltage protector is operated, remove 30kΩ(1/4w)
and confirm whether high voltage protector is still on.
4) Confirm normal operation on sound and video when
R410 is shorted.
7.WHITE VALANCE ADJUSTMENT
1) Receive MONOSCOPE PATTERN signal.
2) Set the each BIAS VR (VR903, VR904, VR905) and
DRIVE VR(VR901, VR902) to center position and Minimize SCREEN using SCREEN VR on the side of FBT.
3) Open LEVER SW(S901) of CRT PCB.
4) Make straight and horizontal line by pushing service
key(V/H) on the SERVICE remocon.
5) Turn the SCREEN VR slowly until first color is brightened and turn the concerned BIAS VR to the anticlockwise until that line's color is diappeared.
6) Turn the SCREEN VR slowly again until another color is
brightened and turn the concernde BIAS VR to the anticlockwise until that line's color is diappeared.
7) Turn the SCREEN VR slowly again until third color is
brightened and turn the concerned BIAS VR to the anticlockwise until that line's color is diappeared.
8) Adjust the BIAS VR to become white concerned line by
turning the BIAS VR in concerned with step 4-6, and 4-7
to clock direction (to be brightened).
9) Although you did step 4-5, 4-6, 4-7,
If it is not bright each step's color but bright first color,
stop turn the SCREEN VR at the position which color is
hardly to be seen, and concerned BIAS VR to clock
direction (to be brightened).
10) Turn LEVER SW(S901) of CRT PCB on.
11) Let the straight and horizontal line to be disappeared by
pushing service key(V/H) on the SERVICE remocon.
12) Set CONTRAST to maximize and set BRIGHT to
become center, and adjust WHITE BALANCE using R's
and B's DRIVE VR.
13) Inspect TRACKING of WHITE BALANCE by varying
CONTRAST and BRIGHT.
If you need to inspect again, Repeat step 4-5 to 4-9.
NOTE :
1. When performing any adjustments to resistor controls
and transformers use non-metallic screw driver or TV
alignment tools.
2. Before performing adjustments TV set must be on at
least 15 minutes.
■■
GENERAL ADJUSTMENT
DVN-14F6N 24KV~26KV
DVN-20F6N 26KV~28KV
8. CONVERGENCE MAGNET ASSEMBLY
POSITIONING
Convergence magnet assembly and rubber wedges need
mechanical positioning following the figure 2.
8-1. COLOR PURITY ADJUSTMENT
NOTE : Before attempting any purity adjustments, the
receiver should be operated for at least 15 minutes.
1) Demagnetize the picture tube using a degaussing coil.
2) Vary the CONTRAST and BRIGHTNESS controls to
maximum.
3) Adjust RED and BLUE Bias controls (RJ04 and RJ24) to
provide only a green raster. Adjust the GREEN BIAS
control (RJ13) if necessary.
4) Loosen the clamp screw holding the yoke, and slide the
yoke backward to provid vertical green belt (zone) in the
picture screen.
5) Remove the Rubber Wedges.
6) Rotate and spread the tabs of the purity magnet (see figure 2) around the neck of the picture tube until the green
belt is in the center of the screen. At the same time, center the raster vertically.
7) Move the yoke slowly forward until a uniform green
screen is obtained. Tighten the clamp screw of the yoke
temporarily.
8) check the purity of the red and blue raster by adjusting
the BIAS controls.
9) Obtain a white raster, referring "CRT GRAT SCALE
ADJUSTMENT" on the CRT board.
10) Proceed with convergence adjustment.
5
6
8-2. CONVERGENCE ADJUSTMENTS
NOTE : Before attempting any convergence adjustments,
the receiver should be operated for at least 15 minutes.
A. CENTER CONVERGENCE ADJUSTMENT
1) Receive crosshatch pattern with a crosshatch signal
generator.
2) Adjust the BRIGHTNESS and CONTRAST Controls for
a good picture.
3) Adjust two tabs of the 4-Pole Magnets to change the
angle between them (See Fig 3) and supertmpose red
and blue vertical lines in the center area of the picture
screen. (See Fig. 4)
4) Turn both tabs at the same time keeping their angles
constant to superimpose red and blue horizontal lines at
the center of the screen. (See Fig. 4)
5) Adjust two tabs of 6-Pole Magnets to superimpose
red/blue line with green one. Adjusting the angle affects
the vertical lines and rotating both magnets affects the
horizontal lines.
6) Repeat adjustments 3) 4) 5) keeping in mind red, green
and blue movement, because 4-Pole Magnets and 6Pole Magnets interact and make dot movement complex.
B. CIRCUMFERENCE CONVERGENCE ADJUSTMENT
NOTE : This adjustment requires Rubber Wedge Kit.
1) Loosen the clamping screw of deflection yoke to allow to
yoke to tilt.
2) Place a wedge as shown on figure 2 temporarily. (Do not
remove cover paper on adhesive part of the wedge).
3) Tilt front of the deflection yoke up or down to obtain better convergence in circumference. (See Fig. 4) Push the
mounter wedge into the space between picture and the
yoke to hols the yoke temporarily.
4) Place other wedge into bottom space and remove the
cover paper to stick.
5) Tilt front of the yoke right or left to obtain better convergence in circumference. (See Fig. 4).
6) Hold the yoke position and put another wedge in either
upper space. Remove cover paper and stick the wedge
on picture tube to hold the yoke.
7) Detach the temporarily mounted wedge and put it in
another upper space. Stick it on picture tube to fix the
yoke.
8) After placing three wedges, recheck overall convergence.
Tighten the screw furmly to hold the yoke tightly in place.
9) Stick 3 adhesive tapes on wedges as shown in figure 2.
Fig. 3
Fig. 4 Dot Movement Pattern
1-3. Installing the Leadless (chip) Component
1) Presolder the contact points of the circuit board.
2) Press the part downward with tweezers and solder
both electrodes as show below.
■■
LEADLESS(CHIP) INSTRUCTION
7
Note :
Do not glue the replacement leadless component to
the circuit board.
1-1. Preparation for replacement
a. Soldering Iron
Use a pencil-type soldering iron that uses less than 3o
watts.
b. Solder
Eutectic solder (Tin 63%, Lead 37%) is recom mened.
c. Soldering time
Do not apply heat more than 4 seconds.
d. Preheating
Leadless capacitor must be preheated before installation.
(130°C~150°C, for about two minutes).
1-2. Removing the leadless component (Resistors,
Capacitors)
.Grasp the leadless component body with tweezers and
alternately apply heat to both electrodes. When the sol- der
on both electrodes is melted, remove leadless component
with a twisting motion.
1.LEADLESS(CHIP) COMPONENT REMOVAL INSTRUCTION
• The following procedures are recommended for the replacement of the leadless components used in this unit.
Note :
a. Leadless component must not be reused after
removal.
b. Excessive mechanical stress and rubbing of the
component electrode must be avoided.
Note :
a. Do not attempt to lift the component off the board
until the component is completely disconnected
from the board by a twisting action.
b. take care not to break the copper foil on printed
board.
8
• Cracked Chipped component Body
• Cracked Separated Solder Joints
• Peeling end Terminations Fractured Leads
2-2. S.M.D (Surface Mounted Devices) Identification
1) Chip Resistor Identification
* Standard chip Resistor code
2) Chip Capacitor Identification
There is no identification of chip capacitor
REMARK Leadless (CHIP) components are identified on
schematic by means of "(C)" adjacent to symbol numbers.
• Rejection of Solder from copper Pads or Component
• Foreign Matter on Copper Pads
• Sloder Bridges
2.LEADLESS (CHIP) COMPONENT IDENTIFICATION
2-1. Check the followings before S. M. D Troubleshooting
XXX
MULTIPLIER (0-9)
2nd SIG. DIGHT (0-9)
1st SIG. DIGHT (1-9)
Examples
123
470
= 12x103(1000) = 12000Ω
= 12KΩ
= 47x 10°(1) = 47Ω
A. cleaning the Tape Transport System
The following parts should be cleaned after every 500
hours of use.
•TENSION POLE
• S-GUIDE POST
• FE HEAD
• S-SLANT POLE
• VIDEO HEAD/DRUM
• T-SLANT POLE
• T-GUIDE ROLLER
• AC HEAD/AE HEAD
• T-CUIDE POST
• CAPSTAN SHAFT
• PINCH ROLLER
NOTE : After cleaning with alcohol, allow the parts to dry
thoroughly before using a cassette tape.
B. Cleaning the Drive System
The following parts should be cleaned after every 500
hours of use.
• REEL TABLE
• T MAIN BRAKE
• S MAIN BRAKE
• T MAIN BRAKE
• CAPSTAN FLYWHEEL/PULLEY
• REEL PULLEY
C. Lubrication points
The following parts should be cleaned and lubricated
after every 500 hours of use. apply one (1) or two (2)
drops of oil. Refer to the "Replacement Parts List" for the
stock number of the recommended oil.
• S REEL TABLE POST
• T REEL TABLE POST
• IDLER PULLEY
CLEANING AND LUBRICATION OF DECK MECANISM IN DVN-14/20F6N
Cleaning and Lubrication
■■
MECHANICAL DISASSEMBLY(DECK)
9
1. Earth Bracket Ass'y
2. FE Head
3. S-Slant Pole Ass'y
4. Tension Lever Ass'y
5. Reel Table
6. Main Base Ass'y
7. S-Sub Brake Ass'y
8. S-Main Brake Ass'y
9. Idler Plate Total Ass'y
10.T-Main Brake Ass'y
11.T-Sub Brake Ass'y
12.Relay Lever
13.Capstan Motor
14.Pinch Lever Total Ass'y
15.L/C Bracker Total Ass'y
16.Cam Gear
17.AC Head Total Ass'y
18.T-Slant Pole Ass'y
Fig. 9- tape Transport Mechanism Identification (Top View)
1.TOP VIEW
10
20.Capstan Motor
21.F/L Rack
22.Connect Plate
23.Reel Belt
24.Reel Gear Total Ass'y
25.Record Safety Lever
26.Loading Lever L
27.Loading Lever R
28.Drum Total Ass'y
29.Loading Rack
Fig. 10- Tape Transport Mechanism Identification (Bottom View)
2.BOTTOM VIEW
11
1. Top Plate Ass'y
2. F/L Bracket R
3. Prism Cap
4. Release Lever
5. Loading Lever R
6. CST Holder Ass'y
7. Loading Shaft
8. Loading Lever L
9. Door opener
10.Safety Lever
11.Safety Lever R
Fig. 11- Front Loading Mechanism Identification (Top view)
3.F/L MECANISM VIEW
4. General removal view
Front Loading Mechanism Removal (Fig. 12)
NOTE :
The front loading mechanism must be in the eject position
to remove it.
1. Remove two (2) screw holding the Front Loading Mech-
anism.
2. Lift the rear of the cassette loading mechanism (hole
parts for screw) to separate it from the Main Base.
Front Loading Mechanism disassembly
(Fig. 13~17)
1. Remove the front loading mechanism.
2. Remove one(1) screw holding the F/L bracket R and
move the F/L bracket R in the direction of arrow to separate it from the top plate and the cassette holder
assembly.
3. Remove the cassette holder assembly (Fig. 13)
4. Remove the prism cap and remove one (1) screw hold-
ing the prism link R and remove the prism link R from the
F/L bracket R (Fig. 4)
5. Remove one (1) screw holding the prism link L (Fig. 15).
6. Release hook B by pushing it in the direction of the
arrow and remove the door opener (Fig. 15).
7. Press the linked section of the loading lever assembly in
the direction of the arrow and remove the loading lever
assembly (Fig. 16)
8. Remove the safety spring between the safety lever and
the cassette holder (Fig. 16)
9. Remove the release spring between the release lever
and the safety lever R (Fig. 16)
12
Fig. 12- Front Loading Mechanism Removal
Fig. 14- F/L Brkt Disassembly
Fig. 15- Top Plate Disassembly
Fig. 13- front loading mechanism disassembly
NOTE :
Reassemble the cassette loading mechanism using the
reverse procedures. Confirm that the two (2) bosses on the
left side of the cassette holder are inserted into the groove
in the left side of the top plate. Insert the two (2) bosses on
the right side into the F/L bracket R (Fig. 17)
Replacement of the Drum Assembly/Earth
Bracket (fig. 18)
1. Remove three (3) screw (3).
2. Remove the earth bracket (5).
3. Carefully lift drum assembly (4) from the deck mechanism taking care not to damage or touch the video
heads.
NOTE :
After reassembling the assembly, confirm that the tape runs
smoothly and confirm all tape path adjustment procdures in
the "Mechanical Adjustment" section of this service publication.
Reel belt, Loading Rack, Loading Gears, and
S/T Slant Pole Removal (Fig. 19, 20)
1. Turn the Deck Mechanism upside down and remove the
reel belt.
2. Remove one (1) poly washer ① and remove the loading
rack (2).
3. Remove Right and left loading gears ③ and ④.
4. Remove the S and T slant poles ⑤ and ⑥ by pulling
them in the direction of the arrow.
NOTE :
• Take care not to get grease on the guide rollers.
• When reinstalling, realign the gears as shown in Fig 20.
13
Fig. 16- Loading Lever Ass'y Disassembly
Fig. 17- F/L Brkt R
Fig. 18- Replacement of the Drum total Ass'y and Earth Brkt Ass'y
Fig. 19- Reel belt, Loading Rack, Loading Gears, S/T slant pole
Removal
A/C Head Assembly Removal (Fig. 21)
1. Remove one (1) nut hex from the A/C head assembly ①
(Fig. 21)
2. Remove the A/C head assembly ② and remove the A/C
head spring ③ from the A/C head assembly ②.
NOTE :
After reinstalling, perform all A/CHead adjustment procedures and all tape path alignment procedures in publication.
Perform the "Audio Bias Level Adjustment" in the "Electrical
Adjustment" section of this service manual.
L/C Bracket Assembly removal (Fig. 22)
1. Remove one (1) screw ① from the L/C bracket assembly ②and remove the L/C bracket assembly ② from the
deck mechanism (Fig. 22)
NOTE :
When reassembling, refer to Fig. 23 for alignment instructions.
Replacement of Pinch Lever Total Assembly
Removal
(Fig. 22)
1. Remove one (1) washer ③.
2. Unhook the pinch spring ④ from the main base ⑤ and
remove the pinch lever total assembly ⑥.
NOTE :
Take care not to get oil on the outside surface of the pinch
roller ⑩.
14
Fig. 20- Loading Gears/Loading Rack Alignment
Fig. 21- A/C Head Assembly Removal
Fig. 22- Replacement of L/C Bracket Total Assembly/Pinch
Lever Total Assembly/cam Gear/Relay Lever/F/L Rack
⑩
Cam Gear, and F/L Rack Removal (fig. 22)
1. Remove the cam gear ⑦ form the deck mechanism.
2. Remove the relay lever ⑥ from the main base ⑤.
3. Remove the F/L rack ⑧ from the deck mechanism.
NOTE :
When reassembling, align the assembly as shown in Fig.
23 & 24.
S/T Main & Sub Brakes Removal (Fig. 25)
1. Unhook the main brake spring ① from the T main brake
lever ③.
2. Disconnect the main brake lever assembly ② and T
main brake lever ③ from the main base ⑧.
3. Unhook the s sub brake spring ④ from the main base
and disconnect the s sub brake lever assembly ⑤ from
the main base ⑧.
4. Unlook the T sub brake spring ⑥ from the main base
and disconnect the T sub brake lever assembly ⑦ from
the main base ⑧.
Tension Band Assembly Removal (Fig. 26, 27)
1. Remove the tension spring ② from the main base ①
(Fig. 26)
2. Turn the deck mechanism upside down (fig. 27) is facing
down (fig. 27)
NOTE :
• After reassembling, adjust the position of the tension pole
as shown in fig. 28.
• Avoid getting grease or oil on the felt section of the band
brake.
15
Fig. 23- L/C Bracket Assembly Alignment
Fig. 25- Main Plate Removal
Fig. 26- Tension Band Assembly Removal (1)
Fig. 24- Cam Gear/F/L Rack Alignment
Capstan Motor Removal (Fig. 29)
Remove three (3) screws and remove the capstan motor.
Idier Plate/Reel Table Removal (fig. 30)
1. Remove one ① polywasher ① from the idler plate ②
and remove the idier plate ② from the main base.
2. Remove the reel tables ③ and the two ② polysliders ④
from the deck mechanism.
FE Head Removal (fig. 31)
Remove one (1) screw (1) and lift the FE head (2) from the
main base.
Reel Gear Total Ass'y and Connect Plate
Removal
(fig. 32)
1. Turn the deck mechanism upside down and remove one
① polywasher ①.
2. Release the tab "B" of the main base and part the reel
gear total ass'y ② from the main base.
3. Push the connect plate ③ to the left direction and separate it from the main base.
NOTE :
• When removing the connect plat with the the F/L rack
installed, take care not to damage/bend the connect plate.
• When assembling or disassembling, take care not to get
oil or grease on the reel belt.
16
Fig. 27- Tension Band Assem-
bly Removal (2)
Fig. 28- Tension Band Assem-
bly Alignment With
Main Base
Fig. 31- FE Head Removal
Fig. 32- Reel gear total ass'y and Connect Plate Removal
Fig. 29-Capstan Motor Removal
Fig. 30- Idler Hate/Reel Table Removal
Some disassembly is required to access the adjustment locations. Refer to the "Disassembly Selection" in this publication
for disassembly instructions.
Caution : Use an isolation transformer when servicing.
5. Mechanical Checks/Gear Alignment (fig. 1, 2, 3, 4, 5)
When mechanical problems occur or when reassembling parts in this mechanism, be sure to confirm the following instructions to confirm the following:
1. Make sure that the datum hole of the cam gear "A" is aligned with the hole "B" in the main base in the EJECT mode
(fig. 1)
2. Make sure that the part of the relay lever "A" which is assembled with CONNECT PLATE is fully rotated up to the left and
of the hole "B" (Fig. 2)
17
Fig. 1– Mechanical Checks/Cam Gear and F/L Alignmen
Fig. 2- Mechanical Checks/relay Lever and Cam Gear Alinment
3. There are two (2) triangular marks on the mode sense switch. When installing the L/C bracket assembly on the main
base, confirm that the two (2) triangular marks aligned with each other in the EJECT mode (Fig. 3)
4. Make sure that the boss "A" of the Pinch Lever Total Ass'y is positioned at the point "B" of the cam gear in EJECT mode
(fig. 4).
18
Fig. 3 - Mechanical checks/Mode Sense S/W Alignment
Fig. 4 – Mechanical Checks/Pinch Lever and Cam Gear Alignment
5. Confirm that the triangular mark "A" on the Loading Gear L Ass'y is aligned with the notch "B" in the Loading Gear R
Ass'y in EJECT mode (Fig. 5)
6. Make sure that the teeth of the Loading Rack are aligned with the those of the Loading Gear R so that hole "C" of the
Loading Rack aligns with the circulr mark "D" on the Loading Gear R (fig. 5)
19
Fig. 5- Mechanical Checks/Loading Loading Rack and Loading Gear Alignment
6. Tension checks
Back Tension Measurement /Adjustment (fig. 6, 7)
1. Confirm that the position of the tension pole is correctly positioned. If not, refer to the "Tension Pole Position Adjustment
Procedures"
2. Play back a T-120 tape from the beginning for about 20 seconds (wait until tape transporting system comes to be stable).
3. Insert the Tensiometer on the tape path (fig. 6) and measure the back tension. the measured result must meet the specification (25-33gr).
4. If the result is not within the specification, adjust the tension spring (If the measured result exceeds the specification,
locate the spring on the hook "A". If the value does not reach the specification, locate the spring on the hook "B".) and
repeat the step 1 thru 3 of "Tension Pole Position Adjustment" (fig. 7).
NOTE :
• Make sure that all of the three probes of the Tensiometer are on contact with the tape, but not with any other parts of the
Deck mechanism.
• It is recommended that the measurement should repeated at least three times to guarantee an accurate reading.
20
Fig. 6 - Back Tension Measurement/Adjustment
TENSIOMETER
PROBE
Operating the VCR Without a Cassette Tape
1. Remove the cassette Loading Mechanism.
2. By hand revolve the worm counterclockwise 7-8 times until pole base loading process starts automatically.
3. Then PLAY mode appears. If you want ANOTHER mode, Press the desired button.
4. If the mechanism is in the desired mode, remove the Power.
Tension Pole Position Adjustment
1. Make the mode PLAY without a cassette loaded. Refer to "Operating the VCR Without a Cassette Tape".
2. Confirm that the datum hole of the tension lever is coincident with that of the main base.
3. If the above confirmation is not satisfying, turn Band Brake Cap clockwise or counterclockwise until the two holes are
coincident with each other.
21
Fig. 7- Tension Pole Position Adjustment
Tape Path Alignment Procedures
The tape transporting system is precisely aligned at the factory and under the normal circumstances will not require adjustment. However, if noise appears in the playback picture, it can be considered that the tape damage occured or the tape
path has been changed, readjustment of the tape path is necessary.
ADJUSTMENT FLOW FOR THE TAPE TRANSPORTING SYSTEM
22
■■
MECHANICAL ADJUSTMENTS
CLEANING
PATH ROUGH ADJ. S GUIDE ROLLER HEIGHT ADJ.
• DRUM TOTAL ASS'Y
• A/C HEAD ASS'Y
• PINCH LEVER
TOTAL ASS'Y
• S-POLE BASE ASS'Y
• T-POLE BASE ASS'Y
• TENSION LEVER
ASS'Y
A/C HEAD HEIGHT ADJ.
PG(PHASE GENERATOR)
ENTRANCE ENVELOPE
EXIT ENVELOPE WAVEFORM
SP, EP
ENTRANCE & EXIT ENVELOPE
WAVEFORM FINE ADJ,
• X-POSITION ROUGH ADJ.
• ENTRANCE & EXIT ENVELOPE
WAVEFORM FINE ADJ.
• REVIEW PLAY
CHANGE
CHANGE
AUDIO TILT, HEIGHT
AZIMUTH ADJ.
S GUIDE POST FLANGE
T GUIDE ROLLER HEIGHT ADJ.
LINEARITY ADJ.
PATH PRE-ADJ.
AUDIO ADJ.
TRACKING
X-POSITION ADJ.
Table. 8 Flow Chart of Tape Path Alignment
23
THE SCHEMATIC DIAGRAM OF TAPE TRANSPORTING SYSTEM
① TENSION POLE
② S-GUIDE POST
③ FE HEAD
④ S-GUIDE ROLLER(P2
)
⑤ S-SLANT POLE
⑥ DRUM
⑦ T-SLANT POLE
⑧ T-GUIDE ROLLER(P
3)
⑨ A/C HEAD
⑩ T-GUIDE POST
⑪ CAPSTAN SHAFT
⑫ PINCH ROLLER
⑬ VERTICAL POST
24
■■SSHHAAPPEE && EEQQUUIIPPMMEENNTT OOFF DDVVNN--1144//2200FF66NN
1. DVN-14F6N/DVN-20F6N
1-1. FRONT OF TV/VCR
1-2. SIDE OF TV/VCR
SPEAKER
(RIGHT)
FRONT DOOR
25
1-3. REAR OF TV/VCR (DVN-14F6N ONLY)
VHF Input
connect VHF antenna to this terminal.
VHF INPUT
* Rear of TV/VCR's Shape of DVN-20F6N is
similar to DVN-14F6N'S
2. PANEL VIEW
2-1. FRONT PANEL
The section below summarizes the buttons, controls, and terminals that you will use with your TV.
Your TV/VCR's front Panel
Below you will find short descriptions of the buttons and indicators on the front panel. These are used following functions.
1 VIDEO IN jack
Use this jack to receive a video signal from another A/V component.
2 AUDIO IN jack
Use this jack to receive an audio signal from another A/V component.
3 Remote control receiver
This receiver receives a signal from your remote control. Do not block it.
4 STAND-BY (red) indicator
This indicator lights up when the power is off.
5 REC (Green) indicator
this indicator blinks when recording and lights up when set for timer recording.
6. CHILD LOCK (Yellow) indicator
This indicator lights up when the child lock is set.
7. REC button (record)
Press this button to begin recording. Press repeatedly to set a recording time using One-Touch Recording (OTR).
8 REW button (rewind)
Use this button to rewind the tape.
9 PLAY button
Press this button to begin normal playback of a tape.
10 FF button (fast forward)
Use this button to "fast forward" a tape.
11 ST/EJ button (stop/eject)
Press this button when a tape is moving to stop the tape. Press this button when the tape is stopped to eject it.
12▼▼VOL▲▲buttons (volume)
Use these buttons to change your TV/VCR's volume.
13▼▼CH▲▲buttons (channel)
Use these buttons to change channels on your TV/VCR. You will also use these buttons to adjust the tracking.
14 Power button
Use this button to turn your TV on or off.
26
3. Remote controller (DVN-14F6N/20F6N)
1 POWER
Use this button to turn your TV/VCR on or off.
2 TV/CATV
Use the button to set up your TV/VCR to receive signals
from an antenna (TV) or a cable system (CATV).
3 TV/LINE
Use this button to select between viewing the signal
coming from the antenna terminal (TV) or the signal
coming from the A/V jacks (LINE).
4 RESET
Press this button to reset the counter to 0:00:00.
5 O STOP
Press this button to automatically rewind the tape to the
0:00:00 point.
6 VISS
▶▶▶▶
Press this button to find the next index mark on a tape
and begin playing.
7 VISS
◀◀◀◀
Press this button to find the most recent index mark on a
tape and begin playing.
8 REC ON/OFF
Use this buttin to enable or disable timer recording.
9 MENU
press this button to turn the on-screen menu system on
and off.
10 REW (rewind)
Use this button to rewind the tape or to change items in
the menu system.
11 REC/OTR
Press this button to begin recording.
Press repeatedly to set a recording time using OneTouch Recording (OTR).
12 PAUSE/STILL
Press to temporarily stop the tape during recording or
playback, or to move the cursor in the menu system.
27
1 2 3
4 5 6
7 8 9
SLEEP 0
STOP//EJECT
100
MUTE RECALL
TV/CATV
POWER
TV/LINE
RESET
COUNTER
0 STOP
REC ON/OFF
MENU
REC/OTR SPEED
CLEAR
PAUSE/STILL
PLAY
VOL/V-LOCK CH/TRK
FFREW
VISS
REMOTE CONTROLLER R-35A01
1
2
3
4
5
6
7
8
9
10
11
12
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