Durabrand DCF2003 Schematic
20” COLOR
SERVICE MANUAL
TELEVISION
DCF2003
27” COLOR
TELEVISION
DCF2703
IMPORTANT SAFETY NOTICE
Proper service and repair is important to the safe, reliable operation of all
Funai Equipment. The service procedures recommended by Funai and described in this service manual are effective methods of performing service
operations. Some of these service special tools should be used when and
as recommended.
It is important to note that this service manual contains various CAUTIONS
and NOTICES which should be carefully read in order to minimize the risk of
personal injury to service personnel. The possibility exists that improper
service methods may damage the equipment. It also is impo rtant to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. Funai
could not possibly know, evaluate and advice the service trade of all conceivable ways in which service might be done or of the possible hazardous
consequences of each way. Consequently, Funai has not undertaken any
such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by Funai must first use all precautions thoroughly so that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
TABLE OF CONTENTS
Specifications........................................................ 1-1
Important Safety Precautions................................ 2-1
Standard Notes for Servicing................................ 3-1
Disassembly Instructions ...................................... 4-1
Electrical Adjustment Instructions......................... 5-1
Block Diagram....................................................... 6-1
Schematic Diagram / CBA's and Test Points ....... 7-1
Schematic Diagram .............................................. 7-3
CBA Views and Test Points..................................7-11
Wave Forms.......................................................... 8-1
Wiring Diagram...................................................... 9-1
IC Pin Function.................................................... 10-1
Cabinet Exploded View ....................................... 11-1
Packing Exploded View....................................... 11-5
Mechanical Parts List .......................................... 12-1
Electrical Parts List.............................................. 13-1
SPECIFICATIONS
<TUNER> ANT. Input ------------------- 75ohm Unbal., F type
Reference Level------------20Vp-p (CRT Green Cathode)
Test Input Signal -----------400Hz 30% modulation
Description Condition Unit Nominal Limit
1. Intermediate Freq. Picture
Sound
2. Peak Picture Sens VHF
CATV
UHF
MHz
MHz
dBµv
dBµv
dBµv
45.75
41.25
15
15
15
-
-
30
30
40
3. AFT Pull In Range
(10mV input)
- MHz ±2.2 ±0.7
<DEFLECTION>
Description Condition Unit Nominal Limit
1. Deflection Freq. Horizontal
Vertical
2. Linearity Horizontal
Vertical
3. Over Scan - % 10 -
4. High Voltage - KV 26 [ DCF2003 ] -
KHz
Hz
%
%
15.734
60
-
-
29 [ DCF2703 ] -
<VIDEO & CHROMA>
Description Condition Unit Nominal Limit
1. Misconvergence Center
Side
Corner
mm
mm
mm
-
-
-
-
-
±15
±10
0.4
1.5
2.1
2. Brightness APL 100% Ft-L 40 [ DCF2003 ] 25 [ DCF2003 ]
25 [ DCF2703 ] 10 [ DCF2703 ]
3. Color Temperature - °K 9200°K -
4. Resolution Horizontal
Vertical
1-1 L6525SP
Line
Line
250
300
-
-
<AUDIO> All items are measured across 8Ω load at speaker output terminal.
Description Condition Unit Nominal Limit
1. Audio Output Power 10% THD W 1 [ DCF2003 ] 0.8 [ DCF2003 ]
10% THD W 3 [ DCF2703 ] 2.4 [ DCF2703 ]
2. Audio Distortion (w/LPF) 500mW % 2 7
3. Audio Freq. Response
Note:
Nominal specifications represent the design specifications. All units should be able to approximate
these. Some will exceed and some may drop slightly below these specifications. Limit specifications
represent the absolute worst condition that still might be considered acceptable. In no case should
a unit fail to meet limit specifications.
-
3dB Hz 100~11K
[ DCF2003 ]
70~11K
[ DCF2703 ]
-
1-2 L6525SP
IMPORTANT SAFETY PRECAUTIONS
Prior to shipment from the fact ory, our products are stri ctly insp ected for reco gnize d product sa fety and el ectric al
codes of the countries in which they are to be sold. Howev er, in order to ma intain such c ompliance, it is equally
important to implement the following precautions when a set is being serviced.
Safety Precautions for TV Circuit
1. Before returning an instrum ent to the c ustom -
er, always make a safety check of the entire instru-
ment, including, but not limited to, the following
items:
a. Be sure that no built-in protectiv e devices are de -
fective and have b een defeated during servicing.
(1) Protective shields are provided on this chassis
to protect both the technician an d the customer.
Correctly replace all missing protective shields, including any removed for servicing convenience.
(2) When reinstalli ng the c hassis an d/or othe r assembly in the cabinet, be sure to put back in place
all protective de vices, in cluding bu t not li mited to,
nonmetallic control knobs, insulating fishpapers,
adjustment and compartment cove rs/shields, and
isolation resistor/capacitor networks. Do not oper-
ate this instrument or permit it to be operated
without all protective devices correctly installed and functioning. Servicers who defeat
safety features or fail to perform safety checks
may be liable for any resulting damage.
b. Be sure that there are no cabinet openings through
which an adult or child might be able to insert their
fingers and contact a hazardous voltage. Such
openings include, but are not l imited to, (1) spacing between the picture tube and the cabinet
mask, (2) excessively wide cabinet ventilation
slots, and (3) an improperly fitted and/or incorrectly
secured cabinet back cover.
c. Antenna Cold Check - With the instrument AC
plug removed from any AC source, connect an
electrical jumper acr oss the two AC plug prongs.
Place the instrumen t AC sw i tch in the o n position.
Connect one lead of an oh mmeter to the A C plug
prongs tied together and to uch the other ohmme ter lead in turn to each tuner antenna input exposed terminal screw and, if applicable, to the
coaxial connector. If the measured resistance is
less than 1.0 mego hm or greater than 5.2 m egohm, an abnormality exists that must be corrected
before the instrument is r eturned to th e custo mer.
Repeat this test with the ins trument AC switch in
the off position.
d. Leakage Current Hot Check - With the instru-
ment completely reassembled, plug the AC line
cord directly into a 120V AC outlet. (Do not use an
isolation transformer d uring this test.) Use a leak-
age current tester or a meter ing syst em that com plies with American National Standards Institute
(ANSI) C101.1 Leakage Current for Appliances
and Underwriters Labor atories (UL) 1410, (50.7 ).
With the instrument AC switc h first in the on posi tion and then in the o ff position, measure from a
known earth ground (metal water pipe, conduit,
etc.) to all exposed metal parts of the ins trument
(antennas, handle br ackets, metal cabi net, screw
heads, metallic overlay s, control shafts, etc.) , especially any exposed metal parts that offer an electrical return path to the chassis. Any current
measured must not excee d 0.5 milli-ampere. Re verse the instrument power cord plug in t he outlet
and repeat the test.
READING SHOULD
NOT BE ABOVE 0.5 mA
LEAKAGE
DEVICE
BEING
TESTED
TEST ALL EXPOSED
METAL SURFACES
ALSO TEST WITH
PLUG REVERSED
USING AC
ADAPTER PLUG
AS REQUIRED
ANY MEASUREMENTS NOT WITHIN THE LIMITS
SPECIFIED HEREIN INDICATE A POTENTIAL
SHOCK HAZARD THAT MUST BE ELIMINATED
BEFORE RETURNING THE INSTRUMENT TO
THE CUSTOMER OR BEFORE CONNECTING
THE ANTENNA OR AC CES SORI ES.
e. X-Radiation and High Voltage Limits - Because
the picture tube is the pri mary potent ial source of
X-radiatio n in soli d-state TV receiver s, it is s pecially constructed to prohibit X-radiation emissions.
For continued X-radiation pr otection, the replacement picture tube must be the same type as the
original. Also, because the picture tube shields
and mounting hardware perform an X-radiation
protection function, they must be correctly in place.
High voltage must be mea su re d ea ch tim e s er v ic-
CURRENT
TESTER
+
EARTH
GROUND
_
2-1 L6115IMP
ing is performed that invol ves B+, horizontal deflection or high voltage. Correct operation of the Xradiation protection circuits also must be reconfirmed each time they are serviced. (X-radiation
protection circuits also may be called "horiz ontal
disable" or "hold down." ) R ead a nd a ppl y th e hi gh
voltage limits a nd, if the chassis is so e quipped,
the X-radiation protection circuit specifications given on instrument labe ls and i n the P roduct S afety
& X-Radiation Warning note on the service data
chassis schematic. High voltage is maintained
within specified limits by close tolerance safety-related components/adjus tme nts in th e hig h-vo lta ge
circuit. If high voltage exceeds specified limits,
check each component specified on the chassis
schematic and take corrective action.
2. Read and comply with all caution and safety-related notes on or inside th e receiver cabine t, on the
receiver chassis, or on the picture tube.
3. Design Alteration Warning - Do not alter or add
to the mechanical or electrical design of this TV receiver. Design alterations and additions, including,
but not limited to circuit modificatio ns and the addition of items such as auxiliary audio and/or video
output connections, mig ht alter the saf ety char acteristics of this receiver and create a hazard to the
user. Any design alter ations or addition s will void
the manufacturer's warr anty and may make you,
the servicer, responsible for personal injury or
property damage resulting therefrom.
4. Picture Tube Implosion Protection Warning -
The picture tube in this receiver employs integral
implosion protection. For continued implosion protection, replace the pic ture tube only with one of
the same type numbe r. Do not rem ove, install , or
otherwise handle the picture tube in any ma nner
without first putting on shatterproof goggles
equipped with side shields. People not so
equipped must be ke pt safely away while p icture
tubes are handled. Keep the picture tube away
from your body. Do not handl e the pictur e tu be b y
its neck. Some "in-line" picture tubes are equipped
with a permanently at tached deflection yoke; be cause of potential hazard, do not try to remove
such "permanently attac hed" yokes from the picture tube.
5. Hot Chassis Warning -
a. Some TV receiver chassis are electrically connect-
ed directly to one conduc tor of the AC power cord
and maybe safety-serviced without an isolation
transformer only i f the AC power plug i s inserted
so that the chassis is connected to the ground side
of the AC power source. To confi rm that the AC
power plug is ins erted correctly, with an AC voltmeter, measure between the chassis and a known
earth ground. If a voltage reading in excess of 1.0V
is obtained, remove and reinsert the AC power
plug in the opposite polarity and again measure
the voltage potential between the chassis and a
known earth ground.
b. Some TV receiver chassis normally have 85V
AC(RMS) between ch assis and earth ground regardless of the AC plug polarity. This chassis can
be safety-serviced only with an isolation transformer inserted in the power line between the receiver
and the AC power so urce, fo r both personn el and
test equipment protection.
c. Some TV receiver chassis have a secondary
ground system in addition to the main chassis
ground. This se conda ry gro und s ystem is no t iso lated from the AC power line. The two ground systems are electrically separated by insulation
material that must not be defeated or altered.
6. Observe original lead dress. Take extra care to assure correct lead dress in the following areas:a.
near sharp edges,b. near thermally hot parts-be
sure that leads and components do not touch thermally hot parts, c. the AC supply,d. high voltage,
and,e. antenna wir ing. Al ways insp ect in a ll are as
for pinched, out of pl ace, or frayed wiring. C heck
AC power cord for damage.
7. Components, parts, and/or wiring that appear to
have overheated or are otherwise damaged
should be replaced with components, parts, or wiring that meet origin al specifications. Additiona lly,
determine the cause of ov erheating and/or damage and, if nece ss ar y, ta ke co rre cti ve ac ti on t o remove any potential safety hazard.
8. Product Safety Notice - Some electrical and mechanical parts have s pecia l safety- relat ed char acteristics which are often not evident from visual
inspection, nor can the protection they give necessarily be obtained by replaci ng them with components rated for higher voltage, wattage, etc.. Parts
that have special safety characteristics are identified by a ( # ) on schematics and in parts lists. Use
of a substitute replacement that does not have the
same safety characteristics as the recommended
replacement part might create sh ock, fire, and/or
other hazards. The product's safety is under review continuously and new instructions are issued
whenever appropriate . Prior to shi pment from the
factory, our products are strictly inspected to confirm they comply with the recognized product safety and electrical codes of the countries in which
they are to be sold. Howev er, in orde r to mai ntain
such compliance , it is equally important to im plement the following precautions when a set is being
serviced.
2-2 L6115IMP
Precautions during Servicing
A. Parts identified b y the ( # ) symbo l are c ritica l for
safety.
Replace only with part number specified.
B. In addition to safety, othe r parts and assemblies
are specified for conformance with regulations applying to spurious radiati on. These must also be
replaced only with specified replacements.
Examples: RF converters, RF cables, noise blocking capacitors, and noise blocking filters, etc.
C. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
D. Use specified insulating materials for hazardous
live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers
4) Insulators for transistors.
E. When replacing AC primary side components
(transformers, power cord, etc.), wrap ends of
wires securely abo ut the terminals before so ldering.
F. Observe that the wires do not contact heat produc-
ing parts (heatsinks, oxide metal film resistors, fusible resistor s, et c .)
G. Check that replaced wires do not contact sharp
edged or pointed parts.
H. When a power cord has been replaced, check that
5~6 kg of force in any direction will not loosen it.
I. Also check areas surrounding repaired locations.
J. Use care that foreign objects (screws, solder drop-
lets, etc.) do not remain inside the set.
K. Crimp type wire connector
The power transform er uses crimp type connec-
tors which connect the power cord and the primary
side of the transformer. When replacing the trans-
former, follow these step s carefully and precis ely
to prevent shock hazards.
Replacement procedure
1) Remove the old conn ector by c utting the wire s at
a point close to the connector.
Important: Do not re-use a connector (discard it).
2) Strip about 15 mm of the ins ulation from the ends
of the wires. If the wires are stranded, twist the
strands to avoid frayed conductors.
3) Align the lengths of the wires to be con nected. Insert the wires fully into the connector.
4) Use the crimping tool to crim p the meta l sleeve at
the center position . Be sure to crimp fully to the
complete closure of the tool.
L. When connecting or disconnecting the internal
connectors, first, discon nect the AC plug from the
AC supply outlet.
2-3 L6115IMP
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 th e fol lo wing tes ts and c on firm the specified values in orde r to verify comp liance
with safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearanc e distance (d) a nd (d') betwee n soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)
T able 1 : Ratings for selected area
AC Line Voltage Region
110 to 130 V
Note: This table is unofficial and for reference only. Be
sure to confirm the precise values.
USA or
CANADA
Clearance
Distance (d) (d')
≥ 3.2 mm
(0.126 inches)
2. Leakage Current Test
Confirm the specified (or lower) leakage current between B (earth ground, power cor d plug prongs) and
externally exposed accessible parts (RF terminals, antenna terminals, vid eo and audio input a nd outp ut terminals, microphone jacks, earphone jacks, etc.) is
lower than or equal to the sp ecified value in the table
below.
Measuring Method : (Power ON)
Insert load Z between B (earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across both terminals of
load Z. See Fig. 2 and following table.
Z
1.5kΩ
Chassis or Secondary Conductor
Primary Circuit Terminals
dd'
Exposed Accessible Part
AC Voltmeter
0.15µF
Earth Ground
B
Power Cord Plug Prongs
(High Impedance)
Fig. 1
Fig. 2
T able 2 : Leakage current ratings for selected areas
AC Line Voltage Region Load Z Leakage Current (i) Earth Ground (B) to:
0.15µF CAP. & 1.5kΩ
110 to 130 V USA
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
RES. connected in
parallel
2-4 L6115IMP
i≤0.5mA rms
Exposed accessible
parts
STANDARD NOTES FOR SERVICING
Circuit Board Indications
a. The output pin of the 3 pin Regulator ICs is indicat-
ed as shown.
Top View
Out
b. For other ICs, pin 1 and ev er y fifth pin are indicat-
ed as shown.
Pin 1
c. The 1st pin of every male connector is indicated as
shown.
Pin 1
Input
In
Bottom View
5
10
(2) Remove the flat pack-IC with tweezers whi le ap-
plying the hot air.
(3) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
Caution:
1. Do not supply hot air to the chip pa rts around the
flat pack-IC for over 6 seconds because damage
to the chip parts may occur. Put masking tape
around the flat pack-IC to protec t other par ts from
damage. (Fig. S-1-2)
2. The flat pack-IC on the CBA is affixed with glue, so
be careful not to br eak or d amage the foi l of ea ch
pin or the solder lands u nder the IC when rem oving it.
Hot-air
Flat Pack-IC
Desoldering
Machine
CBA
How to Remove / Install Flat Pack-IC
1. Removal
With Hot-Air Flat Pack-IC Desoldering Machine:
(1) Prepare the hot-air flat pack-IC desoldering ma-
chine, then apply hot air to the Flat Pack-IC (about
5 to 6 seconds). (Fig. S-1-1)
Fig. S-1-1
Masking
Tape
Tweezers
Flat Pack-IC
Fig. S-1-2
3-1 L6115STA
With Soldering Iron:
(1) Using desoldering braid, r emove the solder from
all pins of the flat pac k-IC. When you use solde r
flux which is appl ied to all pins of the flat pa ck- IC,
you can remove it easily. (Fig. S-1-3)
Flat Pack-IC
Desoldering Braid
Soldering Iron
Fig. S-1-3
(2) Lift each lead of the flat pack-IC up ward one by
one, using a sharp pin or wire to which solder will
not adhere (iron wire). When heating the pins, use
a fine tip soldering iron or a hot air desoldering machine.(Fig. S-1-4)
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(5) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
Note:
When using a soldering iron, care must be taken to
ensure that the flat pack -IC is not being held by
glue. When the flat pack-IC is removed from the
CBA, handle it gently because it may be damaged
if force is applied.
Hot Air Blower
or
Iron Wire
Soldering Iron
To Solid
Mounting Point
Fig. S-1-5
Sharp
Pin
Fine Tip
Soldering Iron
Fig. S-1-4
(3) Bottom of the flat pack-IC is fixe d with glue to t he
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
With Iron Wire:
(1) Using desoldering braid, r emove the solder from
all pins of the flat pac k-IC. When you use solde r
flux which is appl ied to all pins of the flat pa ck- IC,
you can remove it easily. (Fig. S-1-3)
(2) Affix the wire to a workbench or solid mounting
point, as shown in Fig. S-1-5.
(3) While heating the pins using a fine tip soldering
iron or hot air blower, pull up the wire as the solder
melts so as to lift the IC leads from the CBA contact pads as shown in Fig. S-1-5.
(4) Bottom of the flat pack-IC is fixe d with glue to t he
CBA; when removing entire flat pack-IC, first apply
CBA
Tweezers
Fine Tip
Soldering Iron
Flat Pack-IC
Fig. S-1-6
3-2 L6115STA
2. Installation
(1) Using desoldering braid, r emove the solder from
the foil of each pin of the flat pac k-IC on the CBA
so you can install a replacement flat pack-IC more
easily.
(2) The "I" mark on the flat pack-IC indicates pin 1.
(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positioning for installation. Then
pre- solder the four corners of the flat pack-IC.
(See Fig. S-1-8.)
(3) Solder all pins of the flat pack-IC. Be sure that
none of the pins have solder bridges.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Fig. S-1-7
Instructions for Handling
Semiconductors
Electrostatic breakdown of the semiconductors may
occur due to a pote ntial difference c aused by elec trostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grou ndi ng ban d ( 1 MΩ) th at i s pr op erly grounded to remove any static electricity that may
be charged on the body.
2. Ground for Workbench
Be sure to pla ce a conductive sheet or copp er plate
with proper grounding (1MΩ) on the workbench or
other surface, where the semiconductors are to be
placed. Because th e static electrici ty charge on clothing will not es cape through the body gr ounding band,
be careful to avoid contacting semiconductors with
your clothing.
<Incorrect>
CBA
Presolder
Flat Pack-IC
Fig. S-1-8
<Correct>
1MΩ
CBA
Grounding Band
1MΩ
CBA
Conductive Sheet or
Copper Plate
3-3 L6115STA
CABINET DISASSEMBLY INSTRUCTIONS
[ DCF2003 ]
1. Disassembly Flowchart
This flowchart indicate s the disassem bly steps for the
cabinet parts, and the CBA in order to g ain access to
item(s) to be servic ed. Wh en rea ssemb ling, fol low th e
steps in reverse order. Bend, route and dress the
cables as they were.
Caution !
When removing the CRT, be sure to discharge the
Anode Lead of the CRT with the CRT Ground Wire
before removing the Anode Cap.
[1] Rear Cabinet
[2] CRT CBA
[3] Main CBA
[4] CRT
2. Disassembly Method
Note :
(1) Order of steps in procedure. Wh en reassemb ling,
follow the steps in reverse order.These number s
are also used as the Identification (location) No. of
parts in figures.
(2) Parts to be removed or installed.
(3) Fig. No. showing procedure of part location
(4) Identification of part to be removed, unhooked, un-
locked, released, unplugged, unclamped, o r desoldered.
S=Screw, P=Spring, L=Locking Tab, CN=Connector, *=Unhook, Unlock, Release, Unplug, or
Desolder
2(S-2) = two Screws (S-2)
(5) Refer to the following "Reference Notes in the
Table."
Reference Notes in the Table
1. Removal of the Rear Cabinet. Remove screws
7(S-1), (S-2) and 1 (S-4) t hen s lide the Rear Cabinet backward.
2. Removal of the CRT CBA. Disconnect CN501 then
pull the CRT CBA backward.
3. Rem oval of the M ain CBA. D isconnect CN571 on
the Main CBA then slide the Main CBA backward.
Step
/Loc.
No.
[1]
[2] CRT CBA 4,5 CN501 2
[3] Main CBA 3,5 CN571 3
[4] CRT 4 4(S-3), CN691 4
(1) (2) (3) (4) (5)
Part
Rear
Cabinet
↓↓↓↓↓
Fig.
No
1,2
Removal
Remove/*unlock/
release/unplug/
unclamp/desolder
7(S-1), (S-2),
1(S-4)
Note
1
Caution !
Discharge the Anode Lead of the CRT with the CRT
Ground Wire before removing the Anode Cap.
4. Rem oval of the CRT. Remove screws 4(S-3) and
Anode Cap. then slide the CRT backward.
4-1 L6525DC
S-1
S
-1
-2
S-1
-1
S-1
2
ANODE CAP
T
A
4
-1
S-4
VIDEO 1 IN
R
L
S-1
S
ANT.IN
VIDEO
S-VIDEO
S-1
S-2
S
Fig. 1
S-1
S
S-3
[3] Main CBA
S-3
Scotch Tape
#880
S-3
Fig. 3
CR
CB
S-4
[4] CRT
S-3
S-1
[1] Rear Cabinet
Fig.
Fig.
4-2 L6525DC
TV Cable Wiring Diagram
L691 DEGAUSSING COIL
SP802
CN802
CN691
FLYBACK
TRANSFORMER
CLN802
MAIN CBA
WH301A
CN571
SP801
CLN801
CN801
TU1
TUNER
AC601
AC CORD
T571
FOCUS
SCREEN
ANODE
WH501A
JK1501
CN1501
TO CRT GROUND
WH301B
WH501B
Fig. 5
4-3 L6525DC
[ DCF2703 ]
1. Disassembly Flowchart
This flowchart indicate s the disassem bly steps for the
cabinet parts, and the CBA in order to g ain access to
item(s) to be servic ed. Wh en rea ssemb ling, fol low th e
steps in reverse order. Bend, route and dress the
cables as they were.
Caution !
When removing the CRT, be sure to discharge the
Anode Lead of the CRT with the CRT Ground Wire
before removing the Anode Cap.
[1] Rear Cabinet
[2] CRT CBA
[3] Main CBA
[4] CRT
Note :
(1) Order of steps in procedure. Wh en reassemb ling,
follow the steps in reverse order.These number s
are also used as the Identification (location) No. of
parts in figures.
(2) Parts to be removed or installed.
(3) Fig. No. showing procedure of part location
(4) Identification of part to be removed, unhooked, un-
locked, released, unplugged, unclamped, o r desoldered.
S=Screw, P=Spring, L=Locking Tab, CN=Connector, *=Unhook, Unlock, Release, Unplug, or
Desolder
2(S-2) = two Screws (S-2)
(5) Refer to the following "Reference Notes in the
Table."
2. Disassembly Method
Removal
Step/
Loc. No.
[1]
[2] CRT CBA 9,10 CN501 2
[3] Main CBA 8,10 CN571 3
[4] CRT 9 4(S-4), CN691 4
Part
Rear
Cabinet
Fig.
No
6,7
↓↓↓↓↓
(1) (2) (3) (4) (5)
Remove/*unlock/
release/unplug/
unclamp/desolder
7(S-1), 3(S-2),
1(S-3)
Note
1
Reference Notes in the Table
1. Removal of the Rear Cabinet. Remove screws
7(S-1), 3(S-2) and 1(S-3) then slide the Rear Cabinet backward.
2. Removal of the CRT CBA. Disconnect CN501 then
pull the CRT CBA backward.
3. Rem oval of the M ain CBA. D isconnect CN571 on
the Main CBA then slide the Main CBA backward.
Caution !
Discharge the Anode Lead of the CRT with the CRT
Ground Wire before removing the Anode Cap.
4. Rem oval of the CRT. Remove screws 4(S-4) and
Anode Cap. then slide the CRT backward.
4-4 L6625DC
S-1
Front Cabinet
[3] Main CBA
[1] Rear Cabinet
Front Cabinet
S-3
S-2
S-1
[1] Rear Cabinet
S-1
S-1
Fig. 6
S-1
S-1
S-1
S-2
S-3
Control Plate
CRT
Ground Wire
Front
Cabinet
S-4
Anode Cap
S-4
[4] CRT
Fig. 8
Degaussing
Coil
[2] CRT
CBA
S-4
S-4
Control Plate
Control Plate
Fig. 9
Fig. 7
4-5 L6625DC
TV Cable Wiring Diagram
L691 DEGAUSSING COIL
SP802
CN802
CN691
FLYBACK
TRANSFORMER
CLN802
MAIN CBA
WH301A
CN571
SP801
CLN801
CN801
TU1
TUNER
AC601
AC CORD
T571
FOCUS
SCREEN
ANODE
WH501A
JK1501
CN1501
TO CRT GROUND
WH301B
WH501B
Fig. 5
4-6 L6625DC
ELECTRICAL ADJUSTMENT INSTRUCTIONS
[ DCF2003 ]
General No te :
"CBA" is abbreviation for "Circuit Board Assembly."
NOTE:
Electrical adjustm ent s ar e r equ ired after replacing
circuit components a nd certain mechanic al parts.
It is important to perform these adjustm ents only
after all repairs and replacements have been completed.
Also, do not attempt these adjustments unless the
proper equipment is available.
Test Equipment Required
1. NTSC Pattern Generator (Color Bar W/White
Window, Red Color, Dot Pattern, Gray Scale,
Monoscope, Multi-Burst)
2. DC Voltmeter
3. Oscilloscope: Dual-trace with 10:1 probe,
V-Range:0.001~50V/Div,
F-Range: DC~AC-60MHz
4. Plastic Tip Driver
5. Remote control unit: Part No. N0 121UD or N0134UD
6. DC power supply 13.2V/5A
How to make Service rem ote control unit:
1.
Prepare normal remote control unit. (Part No.
N0138UD or N0139UD) Remove 3 S crews from
the back lid. (Fig. 1-1)
2. Added J1 (Jumper Wire) to the re mote control CBA.
(Fig. 1-2)
How to set up the service mode:
Service mode:
1. Use the service remote control unit.
2. Turn the power on. (Use main power on the TV
unit.)
3. Press "SLEEP" button on the service remote control unit. Version of m icro co mpu ter wi ll dis pl ay on
the CRT. (Ex: 054-0.05)
4. Check the display on the lower left is "2901" and if
it is not "2901," set it at "2901" according to "2. Initial Setting."
1. +B Adjustment
Purpose: To obtain correc t oper ation.
Symptom of Misadjustment: The picture is dark and
the unit does not operate correctly.
Test Point Adj. Point Mode Input
TP601(+B)
TP300(GND)
Tape M. EQ. Spec.
--- DC Voltmeter +112±0.5V DC.
Note:TP601, TP300(GND), VR661 --- Main CBA
1. Connect DC Volt Meter to TP601 an d TP3 00 (GND) .
2. Adjust VR661 so th at the voltage o f TP60 1 becomes
+112±0.5V DC.
VR661 --- ---
SCREWS
REMOTE CONTROL UNIT
J 1
REMOTE CONTROL CBA
Fig. 1-1
Fig. 1-2
5-1 L6525EA
2. Initial Setting
General
1. Enter the Service mode. (See page 5-1)
2. Press "VOL p" button on the service remote control
unit. Display changes "C/D," "7F," "LANGUAGE,"
"ACCESS CODE," "SOUND TYPE," "VIDEO
TONE," "FM MODE," "V-OUT," "VIDEO," "AV
MEMO," "STABLE SOUND," "FILTER," "300," and
"YUV MEMORY" cyclically when "VOL p" button is
pressed.
3. To set the following each data value, press "CH o
/ p" buttons on the service remote control unit.
7F --- Set to "FF."
LANGUAGE --- Set to "FRA."
ACCESS CODE --- Set to "OFF."
SOUND TYPE --- Set to "MTS."
VIDEO TONE --- Set to "ON."
FM-MODE --- Set to "O FF."
V-OUT --- Set to "OFF."
VIDEO --- Set to "V1/V2."
AV MEMO --- Set to "OFF."
STABLE SOUND --- Set to "OFF."
FILTER --- Set to "OF F."
Adjusting the monitoring time --- Set to "500."
YUV MEMORY --- Set to "OFF."
3. Setting for BRIGHT, CONTRAST,
COLOR, TINT, and SHARPNESS
data Values
General
1. Enter the Service mode. (See page 5-1)
2. Press "MENU" button on the service remote control
unit. Display changes "BRT," "CNT," "CLR," "SCLR," "TNT," "V-TNT," "S-TNT," "SHARP," and
"S-SRP" cyclically when "MENU" button is
pressed.
S-CLR
1. Press "MENU" butto n on the ser vice remot e control unit. Then select "S-COLOR" (S-CLR) display.
2. Press "CH o/p" buttons on the service remote
control unit so that the value of "S-COLOR" (SCLR) becomes 56.
TNT
1. Press "MENU" butto n on the ser vice remot e control unit. Then select "TINT" (TNT) display.
2. Press "CH o/p" buttons on the service remote
control unit so that the value of "T INT" (TNT) becomes 62.
V-TNT
1. Press "MENU" button on the service remote control unit. Then select "V-TINT" (V-TNT) display.
2. Press "CH o/p" buttons on the service remote
control unit so that the value of "V- TINT" (V-TNT )
becomes 62.
S-TNT
1. Press "MENU" button on the service remote control unit. Then select "S-TINT" (S-TNT) display.
2. Press "CH o/p" buttons on the service remote
control unit so that the value of "S- TINT" (S-TNT )
becomes 59.
SHARP
1. Press "MENU" butto n on the ser vice remot e control unit. Then select "SHARPNESS" (SHARP) display.
2. Press "CH o/p" buttons on the service remote
control unit and select "47."
S-SRP
1. Press "MENU" butto n on the ser vice remot e control unit. Then select "S-SHARPNESS" (S-SRP)
display.
2. Press "CH o/p" buttons on the service remote
control unit and select "47."
CNT
1. Press "MENU" button on the service remote control
unit. Then select "CONTRAST" (CNT) display.
2. Press "CH o/p" buttons on the service remote
control unit so that the value of "CONTRAS" (CNT)
becomes 84.
CLR
1. Press "MENU" button on the service remote control unit. Then select "COLOR" (CLR) display.
2. Press "CH o/p" buttons on the service remote
control unit so that th e value of "COLOR" (CLR)
becomes 56.
5-2 L6525EA
4. Black Stretch Control Adjustment
:
Purpose: To show the fine black color.
Symptom of Misadjustment: Black color will not
appear correctly.
Note: Use service remote control unit.
1. Enter the Service mode. (See page 5-1)
2. Press "6" button on the service remote control unit.
"B-S" is indicated.
3. Press "CH o / p" butt ons on the service remote con-
trol unit so that display will change "OFF," "0," and
"1." Then choose "B-S OFF."
4. Press "6" button on the service remote control unit.
"B-S2" is indi cated.
5. Press "CH o / p" butt ons on the servi ce remote
control unit so that display will change "0" and "1."
Then choose "B-S2 0."
6. Turn the power off and on again, usin g the main
power button on the TV unit.
5. Purity Check
1. Enter the Service mode. (See page 5-1)
2. Pres s "7" butto n on the remo te control u nit. Each
time pressing 7" button on the remote control unit,
display changes Red mode, Green mode, Blue
mode, and White mode cyclically.
3. Select White mode.
4. Turn the power off and on again. (Main power button on the TV unit.)
6. SD Check Mode
1. Enter the Service mode. (See page 5-1)
2. Press " 1" button on the remote control un it. The
unit enter the SD-Check mode.
3. The un it starts selecting the added channel from
first channel according to the memorized CH ADD/
DELL data and CATV/TV data in RAM.
SD Check mode (Factory mode)
Press "1" buton.
7
Please wait
OSD color:
Magenta
There is no SD after
selecting channel.
13
Please wait
There are SD
in all channel.
26
OK
OSD color:
Magenta
OSD color:
Magenta
30
NG
OSD color
Magenta
When SD-Check starting,
there is no ADD channel.
ADD nothing
OSD color:
Magenta
5-3 L6525EA
7. H. Position Adjustment
Purpose: To obtain correct horizontal position of
screen image.
Symptom of Misadjustment: If H. Position is incor-
rect, horizontal position of image on the screen may
not be properly displayed.
9. V. Position Adjustment
Purpose: To obtain correct vertical width of screen
image.
Symptom of misadjustment: If V. Position is incor-
rect, vertical height of image on the screen may not be
properly displayed.
Test Point Adj. Point Mode Input
---
Tape M. EQ. Spec.
--- Monoscope 90±5%
Note: Use service remote control unit
1. Operate the unit for at least 20 minutes.
2. Enter the Service mode. (See page 5-1)
3. Receive the monoscope pattern.
4. Press "8" button on the remote control unit.
"H-P" is indicated.
5. Press "CH o/p" buttons on the service remote
control unit so that the m onoscope pattern will be
90±5% of display size and the circle is round.
6. Turn the power off and on again. (Main power button on the TV unit.)
CH o / p
buttons
RF
Mono-
scope
8. V. Size Adjustment
Purpose: T o obtain correct vertical width of screen image.
Symptom of Misadjustment: If V . Size is incorrect, vertical
size of image on the screen may not be properly displayed.
Test Point Adj. Point Mode Input
---
CH o / p
buttons
RF
Mono-
scope
Test Point Adj. Point Mode Input
---
Tape M. EQ. Spec.
--- Monoscope See below.
Note: Use service remote control unit
1. Operate the unit for at least 20 minutes.
2. Enter the Service Mode. (See page 5-1)
3. Receive the monoscope pattern.
4. Press "9" butt on on the s ervic e remot e control unit
and select "V -P" mo de. ( Dis play ch an ge "V -S" a nd
"V-P" cyclically when "9" button is pressed).
5. Press "CH o/p" buttons on the service remote
control unit so that the top and bottom of the monoscope pattern will be equal of each other.
6. Turn the power off and on again. (Main power button on the TV unit.)
CH o / p
buttons
RF
Mono-
scope
10. Software Reset
To reset software, press “5” button on the remote control unit for at least 5 seconds after pressing “CH
RETURN” button on the remote control unit.
Tape M. EQ. Spec.
--- Monoscope 90±5%
Note: Use service remote control unit.
1. Operate the unit for at least 20 minutes.
2. Enter the Service mode. (See page 5-1)
3. Receive the monoscope pattern.
4. Press "9" butto n on the s ervice remote co ntrol uni t
and select "V-S" mode. (Display changes "V-S" and
"V-P" cyclically wh en "9" butt on is pre sse d).
5. Press "CH o/p" buttons on the service remote
control unit so that the m onoscope pattern will be
90±5% of display size and the circle is round.
6. Turn the power off and on again. (Main power button on the TV unit.)
5-4 L6525EA
11. Cut-off Adjustment
Purpose: To adjust the beam current of R, G, B, and
screen voltage.
Symptom of Misadjustment: White color may be
reddish, greenish or bluish.
12. White Balance Adjustment
Purpose: To mi x r ed , gr ee n an d bl ue bea ms co rre ctl y
for pure white.
Symptom of Misadjustment: White becomes blui sh
or reddish.
Test Point Adj. Point Mode Input
Screen-Control
---
Tape M. EQ. Spec.
---
Note: Screen Control FBT --- Main CBA
F.B.T= Fly Back Transformer
Use service remote control unit
1. Degauss the CRT and allow CRT to operate for 20
minutes before starting the alignment.
2. Input the Black Raster Signal from RF Input.
3. Enter the Service mode. (See page 5-1)
4. Press "VOL p" button on the service remote control unit and select "C/ D" mode. (Displ ay change s
"C/D," "7F," "LANGUAGE," "ACCESS CODE,"
"SOUND TYPE," "VIDEO TONE," "FM MODE,"
"V-OUT," "VIDEO," "AV MEMO," "STABLE
SOUND," "FILTER," "500," and "YUV MEMORY"
cyclically when "VOL p button is pressed.) then
press "1." The display will momentarily show "CUT
OFF R" (R= Red). Now there should be a horizontal line across the center of the picture tube. If
needed gradually turn the screen control on the flyback, clockwise unt il the horizontal line appears.
Adjust the Red Cut off by pr essing the "C H o/p"
buttons. Proceed to Step 5 w hen the Red Cut off
adjustment is done.
5. Press the "2" button. The display will momentarily
show "CUT OFF G" (G=Green). Adjust the Green
Cut off by pressing the "CH o/p" buttons. Proceed
to step 6 when the Green Cut off adjustment is done.
6. Press the "3" button. The di spla y will moment arily
show "CUT OFF B" (B=Bl ue). Adjust th e Blue cut
off by pressing the "CH o/p" buttons. When done
with steps 4, 5 and 6 the hor izo ntal l ine s hou ld be
pure white if not, then attempt the Cut of f adjustment again.
CH o / p
buttons
Pattern
Generator
Figure
PATTERN GENERATOR
EXT. INPUT
RF
See Reference
Notes below.
Fig. 2
Black
Raster
Test Point Adj. Point Mode Input
White
Screen
Tape M. EQ. Spec.
---
Note: Use service remote control unit
1. Operate the unit more than 20 minutes.
2. Face the unit to east. Degauss the CRT using Degaussing Coil.
3. Input the White Raster (APL 100%).
4. S et the color an alyzer to the CHROMA mod e and
after zero point calibration, bring the optical receptor to the center on the tube surface (CRT).
5. Enter the Service mode. Press "VOL p" button on the
service remote control unit and sele ct "C/D" mode.
(Display changes "C/ D, " " 7 F, " " L AN GU A GE ," " AC CESS CODE," "SOUND TYPE," "VIDEO TONE,"
"FM MODE," "V-OUT," "VIDEO," "AV MEMO,"
"STABLE SOUND," "FILTER," "500," and "YUV
MEMORY" cyclically when "VOL p" button is
pressed.) then Press N o. 8 b utton on the s er vice remote control Unit.
6. Press No. 4 butto n on the service remote control
unit for Red adjustment. Press N0. 5 button on the
service remote control unit for Blue adjustment.
7. In each color mode, Press "CH o/p" button to adjust
the values of color.
8. Adjusting Red and Blue color so that the temperature
becomes 9200K (x: 286 / y: 294)±3%.
9. At this time, Re-check that Horizontal line is white.
If not, Re-adjust Cut-off Adjustment unti l the Horizontal Line becomes pure white.
10. Turn off and on again to return to n ormal mo de. Receive APL 100% white signal and Check Chroma
temperatures become 9200K (x: 286 / y: 294)±3%.
Note: Confirm that Cut Off Adj. is correct after this
adjustment, and attemp t Cut Of f Adj. if needed .
CH o / p
buttons
Pattern
Generator,
Color analyzer
Figure
Color Analyzer
RF
Raster
(APL
100%)
See below
Fig. 3
5-5 L6525EA
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