CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS
Contents
Location & Function of control
Safety Precautions
Specifications
Adjustment
Block Diagram
R,G,B Section / Deflection Section
Audio AMP. Section
Exploded View
2
3
4
7
9
15
16
17
18
Exploded View Parts List
Replacement Parts List
Schematic Diagram
19
20
2
POWERMUTE
12
4
7
EYE/*
Q W
VIE
6
PSM SSM/*
7
FAVOURITE
16
8
5
89
0
( )
( )
L ST
SLEEP
RA C/*
Location and function of controls
All the functions can be controlled with the remote control handset. Some functions
can also be adjusted with the buttons on the front panel of the set.
9
3
6
TV/AVMENU
10
15
I
12
1513
14
I/II/*XDP/*
11
Remote control handset
Before you use the remote control handset, please install the batteries. See the
previous page.
1. POWER
switches the set from On to standby or standby to On.
2. NUMBER BUTTONS
switches the set On from standby or directly select a Programme number.
3. MENU
selects a menu.
4. EYE/ (option)
*
switches the eye function On or Off.
5./(Programme Up/Down)
selects a programme or a menu item.
switches the set on from standby.
(Volume Up/Down)
adjusts the volume.
adjusts menu settings.
OK
accepts your selection or displays the current mode.
POWER
1
4
7
PSM
7
EYE/*
15
SLEEP
VOL
10
TV AV
FAVOURITE
16
ARC/*
MUTE
9
3
2
6
5
9
8
SSM
0
Q VIEW
PR
OK
PR
I/II/*
VOL
XDP/*
LIST
MENU
14
12
6
8
11
6. Q. VIEW
returns to the previously viewed programme.
7. PSM (Picture Status Memory)
recalls your preferred picture setting.
8. XDP/*
Select excellent Digital picture.
9. MUTE
switches the sound On or Off.
10. TV/AV
selects TV or AV mode.
clears the menu / text from the screen switches the set On from Standby.
11. I/II/* (option)
selects the language during dual language broadcastselects the sound
(option)
output.
12. LIST
displays the programme table.
press LIST key again to clear the LIST table from the screen.
13. SLEEP
sets the sleep timer.
14. SSM/* (option) (Sound Status Memory)
recalls your preferred sound setting.
15. ARC/* (option)
change picture format (Normal/zoom).
16.FAVOURITE
pressing each time this button will select a stored favourite programme.
Remarks :
1. Some keys in remote can be non-functional, these keys are use in other models.
2. Keys marked * are non functional.
3
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety related characteristics. These parts are identified by in the
Schematic Diagram and Replacement PartsList.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X
RADIATION,Shock, Fire, or other Hazards.
Do not modify the originaldesign without permission of manufacturer.
General Guidance
An Isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitary that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it
with the specified.
When replacing a high wattageresistor (Oxide Metal Film
Resistor,over 1W), keep the resistor l0mm away fromPCB.
Keep wires away from highvoltage or high temperature parts.
Due to high vacuum and large surface area of picture tube, extreme
care should be used in handling the Picture Tube. Do not lift the
Picture tube by it's Neck.
X-RAY Radiation
Warning:
The source of X RAY RADIATION in this TV receiver is the
High Voltage Section and the Picture Tube.
For continued X RAY RADIATION protection, the
replacement tube must be the same type tube as specified
in the Replacement Parts List.
Before returning the receiver tothe customer,
always perform anAC leakage current check onthe exposed metallic
parts of the cabinet, such as antennas, terminals, etc., to be sure the
set is safe to operatewithout damage of electrical shock.
Leakage Current Cold Check (AntennaCold Check)
With the instrument AC plug removed from AC source connect an
electrical jumper across the twoAC plug prongs. Place the AC switch
in the on position, connect one lead of ohm meter to the AC plug
prongs tied together and touch other ohm meter lead in turn to each
exposed metallic parts such asantenna terminals, phone jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between1MW and 5.2MW.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to thecustomer.
Leakage Current Hot Check (Seebelow Figure)
Plug the AC cord directly into theAC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.) and
the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter with
1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each esposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5mA.
In case any measurement is out of the limits sepcified, there is
possibility of shock hazard and the set must be checked and repaired
before it is returned tothe customer.
To determine the presence of high voltage, use an accurate high
impedance HV meter.
Adjust brightness, color, contrast controls to minimum. Measure the
high voltage.
The meter reading should indicate
++
23.5 .5KV: 14 19 inch, 26 1.5KV: 19 21 inch,
++
29.0 1.5KV: 25 29 inch, 30.0 1.5KV: 32 inch,
If the meter indication is out of tolerance, immediate service and
correction is required to prevent the possibility of premature
component failure.
Leakage Current Hot Check circuit
AC Volt meter
To Instrument's
exposed
METALLIC PARTS
1.5 Kohm10W
4
0.15uF
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this servicemanual
and its supplements and addenda, read and follow the SAFETY
PRECAUTIONS on page 3 ofthis publication.
NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety precautions on
page 3 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board module
or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an explosion
hazard.
d. Discharging the picture tube anode.
2. Test high voltage only by measuring it with an appropriate high
voltage meter or other voltage measuring device (DVM, FETVOM,
etc) equipped with a suitable high voltage probe. Do not test high
voltage by "drawing an arc".
3. Discharge the picture tube anode only by (a) first connecting one
end of an insulated clip lead to the degaussing or kine aquadag
grounding system shield at thepoint wherethe picturetube socket
ground lead is connected, and then (b) touch the other end of the
insulated clip lead to the picture tube anode button, using an
insulating handle to avoid personal contactwith high voltage.
4. Do not spray chemicals on or near this receiver or any of its
assemblies.
5. Unless specified otherwise in this service manual, clean electrical
contacts only by applying the following mixture to the contacts with
a pipe cleaner, cotton tipped stick or comparable nonabrasive
applicator; 10% (by volume) Acetone and 90% (by volume)
isopropyl alcohol (90% 99%strength)
CAUTION: This is a flammablemixture.
Unless specified otherwise in this service manual, lubrication of
contacts in not required.
6. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this servicemanual might be equipped.
7. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid state device heat sinks are
correctly installed.
8. Always connect the test receiver ground lead to the receiver
chassis ground before connecting thetest receiver positive lead.
Always remove the test receiverground lead last.
9. Use with this receiver only the test fixtures specified in this service
manual.
CAUTION: Do not connect the test fixture ground strap to any
heatsink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily
by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits andsome fieldeffect
transistors and semicounductor "chip" components. The following
techniques should be used to help reduce the incidence of
component damage caused by staticby static electricity.
1. Immediately before handling any semiconductor component or
semiconductor equipped assembly, drain off any electostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the unit
under test.
2. After removing an electrical assembly equipped with ES devices,
place the assembly on aconductive surfacesuch as aluminum foil,
to prevent electrostatic charge buildup or exposure of the
assembly.
3. Use only a grounded tip soldering iron to solder or unsolder ES
devices.
4. Use only an anti static type solder removal device. Some solder
removal devices not classified as "anti static" can generate
electrical charges sufficent to demageES devices.
5. Do not use freonpropelled chemicals. These can generate
electrical charges sufficient to damageES devices.
6. Do not remove a repalcement ES device from its protective
package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically
shorted togetherby conductive foam, aluminum foil or comparable
conductive material).
7. Immediately before removing the protective material from the
ieads of a replacement ES device, touch the protective material to
the chassis or circuit assembly into which the device will be
installed.
CAUTION: Be sure no power is applied to the chassis or circuit,
and observe all other safetyprecautions.
8. Minimize bodily motions when handling unpackaged replacement
ES devices. (Otherwise harmless motion such as the bruching
together of your clothes fabric or the lifting of your foot from a
carpeted floor can generate static electricity sufficient to damage
an ES device.)
General Soldering Guidelines
1. Use a grounded tip, low wattage soldering iron and appropriate tip
size and shape that will maintantip temperaturewithin therange or
500º F to 600º F.
2. Use an appropriate gauge of RMA resin core solder composed of
60 parts tin/40 parts lead.
3. Keep the soldering iron tipclean and well tinned.
4. Thorohly clean the surfaces to be soldered. Use a mall wirebristle
(0.5 inch, or 1.25cm) brushwith a metal handle.
Do not use freon propelled spray oncleaners.
5.Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature. (500º F
to 600º F)
b.Heat the component leaduntil the solder melts.
c. Quickly draw the melted solder with an anti static, suction type
solder removal device or withsolder braid.
CAUTION: Work quickly to avoid overheating the circuiboard
printed foil.
6. Use the following soldering technique.
a.Allow the soldering irontip to reach a normal temperature (500º F
to 600º F)
b.First, hold the soldering iron tip and solder the strand against the
component lead the solder melts.
5
c. OuIckly move the soldering iron tip to the junction of the
component lead and the printedcircuit foil, and hold itt h e r e
only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit board
printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire bristle brush.
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the circuit
foil. When holes are the slotted type, the following technique should
be used to remove and replace the IC. When working with boards
using the familiar round hole, use the standard technique as outlined
in parapraphs 5 and 6above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the leadwith the soldering iron tip as the soldermelts.
2. Draw away the melted solder with an anti static suction type
solder removal device (or with solder braid) before removing the
IC.
Replacement
1. Carefullyinsert the replacement IC in the circuit boare.
2. Carefully bend each IC lead against the circuit foil pad and solder
it.
3. Clean the soldered areas with a small wire bristle brush. (It is not
necessary to reapply acrylic coatingto the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining on
the circuit board.
3. Bendinto a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with long
nose pliers to insure metal to metal contact then solder each
connection.
Power Output, Transistor Device
Removal/Replacement
1. Heatand remove all solder from around the transistorleads.
2. Removethe heatsink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insertnew transistor in the circuit board.
5. Soldereach transistor lead, and clip offexcess lead.
6. Replaceheatsink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as possible
to diode body.
2. Bendthe two remaining leads perpendicula y to the circuitboard.
3. Observing diode polarity, wrap each lead of the new diode around
the corresponding lead on thecircuit board.
4. Securelycrimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of the
two "original" leads. If they are not shiny, reheat them and if
necessary,apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around notch
at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components andthe circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit board
will weaken the adhesive that bonds the foil to the circuit board
causing the foil to separate from or "lift off" the board. The following
guidelines and procedures should be followed whenever this
condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to installa jumperwire onthe copper pattern side
of the circuit board. (Usethis technique only on IC connections).
1. Carefully remove the damaged copper pattern with a sharp knife.
(Remove only as much copperas absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end ofthe remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around theIC pin. Solder the IC connection.
4. Route the jumper wire along the pathof the out away
copper pattern and let it overlap the previously scraped end of the
good copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern at
connections other than IC Pins. This technique involoves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife. Remove
at least 1/4inch of copper, to ensure thata hazardous condition will
not exist if the jumperwire opens.
2. Trace along the copper patternfrom both sides of the pattern break
and locate the nearest component that is directly connected to the
affected copper pattern.
3. Connect insulated 20 gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead of
the nearest component on the other side. Carefully crimp and
solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the it
does not touch components orsharp edges.
6
SPECIFICATIONS
Note : Specification and others are subject to change without notice for improvement.
< Video input system:
PAL B/G, D/K, I/I
SECAM B/G, D/K,L/L**
NTSC M **
NTSC 4.43
< Intermediate Frequency (Unit : Mhz)
VISION IF : 38.9MHz
COLOR IF : 34.47MHz(4.43)
35.32MHz(3.58): NTSC M
()
VIF 4.25000 MHz
V I F 4.40625MHz**
: SECAM**
< Tuning range
Band
B/G
D/K
VHF-LowCh2-4Ch1-5
VHF-High
Ch5-12
Ch6-12
Hyper
UHF
For TV
SOUND IF :33.4MHz (B/G)
< Power requirement : 110 240V, 50/60Hz
< Power consumption :
< STAND-BY : <6W
32.9MHz (I/I)
32.4MHz (D/K)
34.4MHz (M)
*
For CATV
I/I
NTSC
S1'-S3', S1
S2-S10,
Ch2-13
Ch4-13
S11-S20
S21-S41
Chl4-69Ch21-69
< Tuning system :<Feature : Auto programme /Manual programme
< OSD (On Screen Display) : EASY_MENUFavourite Program
< Voice coil impedance : 8 ohm
< Sound output :
Dual/Stereo : A2/NICAM(Option)
< External connection : Head Phone Jack
< External In/Output
Audio In:O.5Vrms±3dB, over 10Kohm
Audio Out:0.5Vrms±3dBb,below 1Kohm
Video In/Out:1Vp p±3d8, 75ohm
DVD In Y: 1Vp p±3dB
*Depend on model.
** For Export model.
*
A/V in : 2
PERI Connector(Full Scart) :1 (option)
DVD in (option)
Pb,Pr : 0.7Vp p±3dB
Programme Editing
SSM (Sound Status Memory)
XDP*
7
DISASSEMBLY INSTRUCTIONS
Important note
This set is disconnected from the power supply through the converter.
transformer. An isolating transformer is necessary for service
operations on the primary side ofthe converter transformer.
Back Cabinet Removal
Removal the screws residing on the back cabinet and carefully
separate the back cabinet fromthe front cabinet cabinet. (Fig. 2 1).
CPT Removal
1. Pull out the CPT board from the CPTneck.
2. Place the frontcabinet on soft material not tomar the front surface
or damage control knobs.
3. Remove 5 screws securing the picture tube mounting brackets to
the front cabinet.
4. Carefully separate CPTfrom the front cabinet.
Chassis Assy Removal
Grasp both side of Frameand pull it backward smoothly.
PICTURE TUBE HANDLING CAUTION
Due tohigh vacuum and large surface area of picture tube, great care
must be exercised when handlingpicture tube.Always lift picture tube
by grasping it firmly aroundfaceplate.
NEVER LIFT TUBE BY ITS NECK! The picture tube must not be
scratched or subjected to excessive pressure as fractureof glassmay
result in an implosion of considerable violence which can cause
personal injury or property damage.
Remove
Screws
CPT
board
Main
PCB
8
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