Emerson ept427 schematic
SERVICE MANUAL
27" COLOR TELEVISION
EPT427
VOLUME
MENU
CHANNEL
VIDEO
HEADPHONE
L AUDIO R
VIDEO 2
POWER
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 important 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 ..................................... 7-9
Wave Forms............................................................ 8-1
Wiring Diagram........................................................ 9-1
IC Pin Fuction........................................................ 10-1
Cabinet Exploded View ..........................................11-1
Packing Exploded View..........................................11-3
Mechanical Parts List ............................................ 12-1
Electrical Parts List................................................ 13-1
SPECIFICATIONS
< TUNER>
Description Condition Unit Nominal Limit
1. Intermediate Freq. Picture
2. Peak Picture Sens VHF
3. AFT Pull In Range
(10mV input)
ANT. Input ------------------------- 75ohm Unbal., F type
Reference Level ----------------- 20Vp-p (CRT Green Cathode)
Test Input Signal ----------------- 400Hz 30% modulation
Sound
CATV
UHF
—MHz± 2.2
MHz
MHz
dBµV
dBµV
dBµV
45.75
41.25
15
15
15
< DEFLECTION>
Description Condition Unit Nominal Limit
1. Deflection Freq. Horizontal
Vertical
2. Linearity Horizontal
Vertical
3. Over Scan — % 10 —
4. High Voltage — KV 29 —
KHz
Hz
%
%
15.734
60
—
—
—
—
30
30
40
±
0.7
—
—
±
15
±
10
< VIDEO & CHROMA>
Description Condition Unit Nominal Limit
1. Misconvergence Center
2. Brightness APL 100% Ft-L 30 15
3. Color Temperature — °K 9200°K —
4. Resolution Horizontal
<AUDIO>
Description Condition Unit Nominal Limit
1. Audio Output Power 10% THD W 3 2.4
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.
All items are measured across 8Ω load at speaker output terminal.
Side
Corner
Vertical
−
3dB Hz 90~11K —
mm
mm
mm
Line
Line
—
—
—
250
300
0.4
1.5
2.1
—
—
1-1 L1520SP
IMPORTANT SAFETY PRECAUTIONS
Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical
codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally
important to implement the following precautions when a set is being serviced.
Safety Precautions for TV Circuit
1.Before returning an instrument to the customer,
instrument, including, but not limited to, the following
items:
Be sure that no built-in protective devices are defec-
a.
tive and have been defeated during servicing. (1)
Protective shields are provided on this chassis to
protect both the technician and the customer. Correctly replace all missing protective shields, including any removed for servicing convenience. (2)
When reinstalling the chassis and/or other assembly
in the cabinet, be sure to put back in place all
protective devices, including but not limited to, nonmetallic control knobs, insulating fishpapers, adjustment and compartment covers/shields, and isolation resistor/capacitor networks.
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.
Be sure that there are no cabinet openings through
b.
which an adult or child might be able to insert their
fingers and contact a hazardous voltage. Such
openings include, but are not limited 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 -
plug removed from any AC source, connect an
electrical jumper across the two AC plug prongs.
Place the instrument AC switch in the on position.
Connect one lead of an ohmmeter to the AC plug
prongs tied together and touch the other ohmmeter
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 megohm or greater than 5.2 megohm, an abnormality exists that must be corrected before the instrument is returned to the customer. Repeat this
test with the instrument AC switch in the off position.
d.Leakage Current Hot Check -
ment completely reassembled, plug the AC line cord
directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage
always make a safety check of the entire
Do not operate
With the instrument AC
With the instru-
current tester or a metering system that complies
with American National Standards Institute (ANSI)
C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the
instrument AC switch first in the on position and then
in the off position, measure from a known earth
ground (metal water pipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle brackets, metal cabinet, screw heads, metallic
overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path
to the chassis. Any current measured must not
exceed 0.5 milli-ampere. Reverse the instrument
power cord plug in the 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 ACCESSORIES.
CURRENT
TESTER
+
EARTH
GROUND
_
e.X-Radiation and High Voltage Limits -
cause the picture tube is the primary potential
source of X-radiation in solid-state TV receivers, it
is specially constructed to prohibit X-radiation emissions. For continued X-radiation protection, 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 measured each time servicing
Be-
2-1 SFTY_01
is performed that involves B+, horizontal deflection
or high voltage. Correct operation of the X-radiation
protection circuits also must be reconfirmed each
time they are serviced. (X-radiation protection circuits also may be called "horizontal disable" or "hold
down.") Read and apply the high voltage limits and,
if the chassis is so equipped, the X-radiation protection circuit specifications given on instrument labels
and in the Product Safety & X-Radiation Warning
note on the service data chassis schematic. High
voltage is maintained within specified limits by close
tolerance safety-related components/adjustments
in the high-voltage circuit. If high voltage exceeds
specified limits, check each component specified on
the chassis schematic and take corrective action.
Read and comply with all caution and safety-related
2.
notes on or inside the receiver cabinet, on the receiver chassis, or on the picture tube.
3.Design Alteration Warning -
to the mechanical or electrical design of this TV
receiver. Design alterations and additions, including, but not limited to circuit modifications and the
addition of items such as auxiliary audio and/or
video output connections, might alter the safety
characteristics of this receiver and create a hazard
to the user. Any design alterations or additions will
void the manufacturer’s warranty and may make
you, the servicer, responsible for personal injury or
property damage resulting therefrom.
Do not alter or add
4.Picture Tube Implosion Protection Warning
-
The picture tube in this receiver employs integral
implosion protection. For continued implosion protection, replace the picture tube only with one of the
same type number. Do not remove, install, or otherwise handle the picture tube in any manner without
first putting on shatterproof goggles equipped with
side shields. People not so equipped must be kept
safely away while picture tubes are handled. Keep
the picture tube away from your body. Do not handle
the picture tube by its neck. Some "in-line" picture
tubes are equipped with a permanently attached
deflection yoke; because of potential hazard, do not
try to remove such "permanently attached" yokes
from the picture tube.
5.Hot Chassis Warning -
Some TV receiver chassis are electrically con-
a.
nected directly to one conductor of the AC power
cord and maybe safety-serviced without an isolation
transformer only if the AC power plug is inserted so
that the chassis is connected to the ground side of
the AC power source. To confirm that the AC power
plug is inserted 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.
Some TV receiver chassis normally have 85V
b.
AC(RMS) between chassis 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 source, for both personnel and test
equipment protection.
Some TV receiver chassis have a secondary ground
c.
system in addition to the main chassis ground. This
secondary ground system is not isolated from the
AC power line. The two ground systems are electrically separated by insulation material that must not
be defeated or altered.
Observe original lead dress. Take extra care to
6.
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 wiring. Always inspect in all areas
for pinched, out of place, or frayed wiring. Check AC
power cord for damage.
Components, parts, and/or wiring that appear to
7.
have overheated or are otherwise damaged should
be replaced with components, parts, or wiring that
meet original specifications. Additionally, determine
the cause of overheating and/or damage and, if
necessary, take corrective action to remove any
potential safety hazard.
8.Product Safety Notice -
mechanical parts have special safety-related characteristics which are often not evident from visual
inspection, nor can the protection they give necessarily be obtained by replacing 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 shock, fire, and/or
other hazards. The product’s safety is under review
continuously and new instructions are issued whenever appropriate. Prior to shipment 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. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.
Some electrical and
2-2 SFTY_01
Precautions during Servicing
Parts identified by the ( # ) symbol are critical for
A.
safety.
Replace only with part number specified.
In addition to safety, other parts and assemblies are
B.
specified for conformance with regulations applying
to spurious radiation. These must also be replaced
only with specified replacements.
Examples: RF converters, RF cables, noise blocking capacitors, and noise blocking filters, etc.
Use specified internal wiring. Note especially:
C.
1)Wires covered with PVC tubing
2)Double insulated wires
3)High voltage leads
Use specified insulating materials for hazardous live
D.
parts. Note especially:
1)Insulation Tape
2)PVC tubing
3)Spacers
4)Insulators for transistors.
When replacing AC primary side components
E.
(transformers, power cord, etc.), wrap ends of wires
securely about the terminals before soldering.
Observe that the wires do not contact heat produc-
F.
ing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.)
Check that replaced wires do not contact sharp
G.
edged or pointed parts.
When a power cord has been replaced, check that
H.
5~6 kg of force in any direction will not loosen it.
Also check areas surrounding repaired locations.
I.
Use care that foreign objects (screws, solder drop-
J.
lets, etc.) do not remain inside the set.
Crimp type wire connector
K.
The power transformer uses crimp type connectors
which connect the power cord and the primary side
of the transformer. When replacing the transformer,
follow these steps carefully and precisely to prevent
shock hazards.
Replacement procedure
1)Remove the old connector by cutting the wires at a
point close to the connector.
Important: Do not re-use a connector (discard it).
2)Strip about 15 mm of the insulation 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 connected. Insert
the wires fully into the connector.
4)Use the crimping tool to crimp the metal sleeve at
the center position. Be sure to crimp fully to the
complete closure of the tool.
When connecting or disconnecting the internal con-
L.
nectors, first, disconnect the AC plug from the AC
supply outlet.
2-3 SFTY_01
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
specified values in order to verify compliance with safety
standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d’) between soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
Chassis or Secondary Conductor
Primary Circuit Terminals
dd'
AC Line Voltage Region
110 to 130 V
This table is unofficial and for reference only. Be
Note:
sure to confirm the precise values.
USA or
CANADA
2. Leakage Current Test
Confirm the 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.) is lower
than or equal to the specified 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.
Table 2 : Leakage current ratings for selected areas
AC Line Voltage Region Load Z Leakage Current (i) Earth Ground (B) to:
110 to 130 V USA
Clearance Distance
(d) (d’)
≥
3.2 mm
(0.126 inches)
0.15µF CAP. &
1.5kΩ RES.
connected in
parallel
Exposed Accessible Part
Z
1.5kΩ
i≤0.5mA rms Exposed accessible parts
0.15µF
Earth Ground
B
Power Cord Plug Prongs
AC Voltmeter
(High Impedance)
Fig. 1
Fig. 2
This table is unofficial and for reference only. Be sure to confirm the precise values.
Note:
2-4 SFTY_01
STANDARD NOTES FOR SERVICING
Circuit Board Indications
a.The output pin of the 3 pin Regulator ICs is indicated
as shown.
Top View
Out
b.For other ICs, pin 1 and every fifth pin are indicated
as shown.
Input
In
Pin 1
c.The 1st pin of every male connector is indicated as
shown.
Bottom View
5
10
(2)Remove the flat pack-IC with tweezers while apply-
ing 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 tweez-
ers. (Fig. S-1-6)
Caution:
1.Do not supply hot air to the chip parts 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 protect other parts from damage.
(Fig. S-1-2)
2.The flat pack-IC on the CBA is affixed with glue, so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when removing
it.
Hot-air
Flat Pack-IC
Desoldering
Machine
CBA
Pin 1
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 SFTY_08
With Soldering Iron:
(1)Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-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 upward 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 tweez-
ers. (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
Sharp
Pin
Fine Tip
Soldering Iron
Fig. S-1-4
(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 tweez-
ers. (Fig. S-1-6)
With Iron Wire:
(1)Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-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 fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
To Solid
Mounting Point
CBA
Tweezers
Fig. S-1-5
Fine Tip
Soldeing Iron
Flat Pack-IC
Fig. S-1-6
3-2 SFTY_08
2. Installation
(1)Using desoldering braid, remove the solder from the
foil of each pin of the flat pack-IC on the CBA so you
can install a replacement flat pack-IC more easily.
(2)The " ● " 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 potential difference caused by electrostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1MΩ) that is properly
grounded to remove any static electricity that may be
charged on the body.
2. Ground for Workbench
Be sure to place a conductive sheet or copper plate with
proper grounding (1MΩ) on the workbench or other
surface, where the semiconductors are to be placed.
Because the static electricity charge on clothing will not
escape through the body grounding band, be careful to
avoid contacting semiconductors with your clothing.
< Incorrect >
CBA
Presolder
Flat Pack-IC
CBA
< Correct >
Grounding Band
Fig. S-1-8
1MΩ
CBA
1MΩ
Conductive Sheet or
Copper Plate
3-3 SFTY_08
DISASSEMBLY INSTRUCTIONS
1. Disassembly Flowchart
This flowchart indicates the disassembly steps for the
cabinet parts, and the CBA in order to gain access to
item(s) to be serviced. When reassembling, follow the
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
Removal
Step/
Loc. No.
[1]
[2] CRT CBA 4,5 CN501
[3] Main CBA 3,5 CN571 3
[4] CRT 4 4(S-3), Anode Cap 4
↓↓↓ ↓ ↓
Part
Rear
Cabinet
Fig.
No
1,2
➀➁➂ ➃ ➄
Remove/*unlock/
.
release/unplug/
unclamp/desolder
7(S-1), 2(S-2), 1(S-4)
Note
1
2
Note :
Order of steps in procedure. When reassembling,
.
➀
follow the steps in reverse order.
These numbers are also used as the Identification
(location) No. of parts in figures.
Parts to be removed or installed.
.
➁
Fig. No. showing procedure of part location
.
➂
Identification of part to be removed, unhooked, un-
.
➃
locked, released, unplugged, unclamped, or
desoldered.
S=Screw, P=Spring, L=Locking Tab, CN=Connector, *=Unhook, Unlock, Release, Unplug, or
Desolder
2(S-2) = two Screws (S-2)
Refer to the following "Reference Notes in the
.
➄
Table."
Reference Notes in the Table
1.Removal of the Rear Cabinet. Remove screws
7(S-1), 2(S-2) and 1(S-4) then slide the Rear Cabinet backward.
2.Removal of the CRT CBA. Disconnect CN501 then
pull the CRT CBA backward.
3.Removal of the Main CBA. Disconnect 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.Removal of the CRT. Remove screws 4(S-3) and
Anode Cap. then slide the CRT backward.
4-1 L1522DC
S-1
[3] Main CBA
S-1
S-1
ANT.IN
VIDEO1 INPUT
L
R
VIDEO
S-VIDEO
S-1S-4
S-2
S-1
Fig. 1 Fig. 3
S-1
ANODE CAP
S-1
S-2
S-3
Scotch Tape
#880
[2] CRT CBA
S-1
[1] Rear Cabinet
Fig. 2
S-3
S-1
S-1
[4] CRT
4-2 L1522DC
S-3
S-3
Fig. 4
TV Cable Wiring Diagram
SP802
SP801
L691 DEGAUSSING COIL
MAIN CBA
CN691
FLYBACK TRANSFORMER
T571
CLN802
CLN801
CN801
CN802
WH301A
TU1
TUNER
W601
AC CORD
CN571
FOCUS
SCREEN
ANODE
WH501A
JK501
CN501
TO CRT GROUND
WH301B
WH501B
Fig. 5
4-3 L1522DC
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note:
"CBA" is abbreviation for "Circuit Board Assembly".
NOTE:
Electrical adjustments are required after replacing
circuit components and certain mechanical parts.
It is important to perform these adjustments 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. N0121UD or N0134UD
6.DC power supply 13.2V/5A
1. +B Adjustment
Purpose:
Symptom of Misadjustment:
the unit does not operate correctly.
Test Point Adj. Point Mode Input
Note:
1.Connect DC Volt Meter to TP601 and TP300(GND).
2. Adjust VR661 so that the voltage of TP601 becomes
To obtain correct operation.
The picture is dark and
TP601
(+B)
TP300
(GND)
Tape M. EQ. Spec.
--- DC Voltmeter +138±0.5V DC.
TP601, TP300(GND), VR661 --- Main CBA
+138V±0.5V DC.
VR661 --- ---
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 micro computer will display
on the CRT. (Ex: 5Y10-1.34)
4.Check the display on the lower left is "4A" and if it is
not "4A", set it at "4A" according to "3-1 FRENCH,
STEREO TYPE, ACCESS CODE, VIDEO TONE,
SB SOUND" and "COMB FILTER".
5-1 L1522EA
2-1. Setting for 7F, FRENCH,
STEREO TYPE,
ACCESS CODE, VIDEO TONE
SB SOUND and COMB FILTER
data Values
General
1.Enter the Service mode. (See page 5-1)
2.Press " VOL ▼ " button on the Service remote
control unit. Display changes " C/D ", " 7F ", "
FRENCH ", " STEREO TYPE ", " ACCESS CODE",
"VIDEO TONE ", "SB SOUND" and "COMB FILTER"
cyclically when " VOL ▼ " button is pressed.
7F
Press " CH ▲ / ▼ " buttons on the Service remote
control unit. Then choose " FF ".
FRENCH
Press " CH ▲ / ▼ " buttons on the Service remote
control unit. Then choose " ON ".
STEREO TYPE
Press " CH ▲ / ▼ " buttons on the Service remote
control unit. Then choose " MTS ".
ACCESS CODE
Press " CH ▲ / ▼ " buttons on the Service remote
control unit. Then choose " OFF ".
VIDEO TONE
Press " CH ▲ / ▼ " buttons on the Service remote
control unit. Then choose " OFF ".
SB SOUND
Press " CH ▲ / ▼ " buttons on the Service remote
control unit. Then choose " OFF ".
COMB FILTER
Press " CH ▲ / ▼ " buttons on the Service remote
control unit. Then choose " ON ".
Note: C/D
at this moment.
and
data values are no need to adjust
VCO
2-2. Setting for CONTRAST,
COLOR, TINT, V-TINT and
SHARP 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 ", "
TNT " and " V-TINT " cyclically when " MENU " button
is pressed.
CNT
1. Press " MENU " button on the Service remote control
unit. Then select " CONTRAST " (CNT) display.
2.Press " CH ▲ / ▼ " buttons on the Service remote
control unit so that the value of " CONTRAST " (CNT)
becomes 92.
CLR
1. Press " MENU " button on the Service remote control
unit. Then select " COLOR " (CLR) display.
2.Press " CH ▲ / ▼ " buttons on the Service remote
control unit so that the value of " COLOR " (CLR)
becomes 64.
TNT
1. Press " MENU " button on the Service remote control
unit. Then select " TINT " (TNT) display.
2.Press " CH ▲ / ▼ " buttons on the Service remote
control unit so that the value of " TINT " (TNT)
becomes 64.
V-TNT
1. Press " MENU " button on the Service remote control
unit. Then select " V-TINT " (V-TNT) display.
2.Press " CH ▲ / ▼ " buttons on the Service remote
control unit so that the value of " V-TINT " (V-TNT)
becomes 64.
Note: BRIGHT
moment.
data value is no need to adjust at this
5-2 L1522EA
3. AFT Adjustment
Purpose:
Symptom of Misadjustment:
rectly and/or synchronization is faulty.
To operate AFT correctly.
VCO does not work cor-
3.Press " CH ▲ / ▼ " buttons so that the voltage of
TP301 becomes +2.5±0.1V DC. If the tuner is used
TEDH9-300A. (Tuner type number)
4. Turn the Power off and on again. (Main power button
on the TV unit.)
Test Point Adj. Point Mode Input
TP303
(AFT)
TP300
(GND)
Tape M. EQ. Spec.
--- --- ---
Use service remote control unit.
Note:
1.Enter the Service mode. (See Page 5-1)
2.Put the core(L33) at the same level of the case.
3.Make the core down till the adjustment point(See
Fig.1).
L33 ---
Figure
USA 4ch
80dBu
Color Bar
Fig. 1
5. MTS Adjustment
Purpose:
Symptom of Misadjustment:
incorrect, stripes will appears on the screen.
5-1. INPUT LEVEL
Test Point Adj. Point Mode Input
(L-OUT)
(GND)
Note:
Use Service remote control unit.
1.Enter the Service mode. (See Page 5-1)
2.Press " 4 " button on the Service remote control unit.
3.Press " CH ▲ / ▼ " buttons on the Service remote
5-2. LOW SEPARATION
To get minimum leakage of the color signal carrier.
If C- Trap Adjustment is
TP452
TP454
Tape M. EQ. Spec.
---- AC Volt Meter ----
TP452, TP454 --- MTS&SUB PCB
control unit so that the value of TP452 becomes
105±5mVrms.
Service mode->
"4" key->
"INPUT LEVEL"->
CH ▲ / ▼ buttons
RF
USA 4ch
80dBu
AUDIO
1KHz(MONO
,±100%)
4. AGC Adjustment
Purpose:
Symptom of Misadjustment:
nize correctly when RF input level is too weak and
picture distortion may occur if it is too strong.
TP301
(AGC)
TP300
(GND)
Notes:
Use Service remote control unit.
1.Enter the Service mode. (See Page 5-1) Then
2.Receive the Color Bar signal for channel 4
Set AGC (Auto Gain Control) Level.
AGC does not synchro-
Test
Point
Tape M. EQ. Spec.
---
TP301 --- Main CBA
press number " 2 " button on the Service remote
control unit and select TV AGC.
(67.25MHz). (RF Input Level: 60dBµV)
Adj. Point Mode Input
CH ▲ / ▼ buttons RF
Pattern Generator
DC Volt Meter
+2.5±0.1VDC
Color Bar
67.25MHz
60dBµV
Test Point Adj. Point Mode Input
TP453
(R-OUT)
TP454
(GND)
Tape M. EQ. Spec.
---- AC Volt Meter ----
Note:
Use Service remote control unit.
TP453, TP454 --- MTS&SUB PCB
1.Enter the Service mode. (See Page 5-1)
2.Press " 4 " button two times on the Service remote
control unit.
3.Press " CH ▲ / ▼ " buttons on the Service remote
control unit so that the value of TP453 becomes
minimun on the oscilloscope reading.
Service mode->
"4" key two times
->"LOW SEP"->
CH ▲ / ▼ buttons
RF
USA 4ch
80dBu
AUDIO300Hz
(STEREO
Lch., ±30%)
5-3 L1522EA
5-3. HIGH SEPARATION
Test Point Adj. Point Mode Input
TP453
(R-OUT)
TP454
(GND)
Tape M. EQ. Spec.
---- AC Volt Meter ----
Note:
Use Service remote control unit.
TP453, TP454 --- SUB PCB
1.Enter the Service mode. (See Page 5-1)
2.Press " 4 " button three times on the Service remote
control unit.
3.Press " CH ▲ / ▼ " buttons on the Service remote
control unit so that the value of TP453 becomes
minimun on the oscilloscope reading.
Service mode->
"4" key three
times->
"HIGH SEP"->
CH ▲ / ▼ buttons
RF
USA 4ch
80dBu
AUDIO3KHz
(STEREO
Lch, ±30%)
6. V. Size Adjustment
Purpose:
Symptom of Misadjustment:
size of image on the screen may not be properly displayed.
Test Point Adj. Point Mode Input
Note:
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 " button on the Service remote control unit
5.Press " CH ▲ / ▼ " buttons on the Service remote
6.Turn the power off and on again. (Main power button
To obtain correct vertical width of screen image.
If V. Size is incorrect, vertical
---
Tape M. EQ. Spec.
--- Monoscope 90±5%
Use service remote control unit.
and select " V-S "mode. (Display changes " V-S "
and " V-P " cyclically when " 9 " button is pressed).
control unit so that the monoscope pattern will be
90±5% of display size and the circle is round.
on the TV unit.)
Screen Control
CH ▲ / ▼ buttons
[ V-S ] Mode
RF Monoscope
7. V. Position Adjustment
Purpose:
image.
Symptom of misadjustment:
vertical height of image on the screen may not be
properly displayed.
To obtain correct vertical width of screen
If V. Position is incorrect,
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 " 9 " button on the Service remote control unit
and select " V-P "mode. (Display change " V-S " and
" V-P " cyclically when " 9 " button is pressed).
5.Press " CH ▲ / ▼ " 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.)
Screen Control
CH ▲ / ▼ buttons
[ V-P ] Mode
RF Monoscope
8. H. Position Adjustment
Purpose:
image.
Symptom of Misadjustment:
horizontal position of image on the screen may not be
properly displayed.
Test Point Adj. Point Mode Input
Note:
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 and
5.Press " CH ▲ / ▼ " buttons on the Service remote
6. Turn the Power off and on again. (Main power button
To obtain correct horizontal position of screen
If H. Position is incorrect,
---
Tape M. EQ. Spec.
--- Monoscope 90±5%
Use Service remote control unit
select " H-P "mode.
control unit so that the monoscope pattern will be
90±5% of display size and the circle is round.
on the TV unit.)
Screen Control
CH ▲ / ▼ buttons
[ H-P ] Mode
RF Monoscope
5-4 L1522EA
9. H. Size Adjustment
Purpose:
image.
Symptom of Misadjustment:
horizontal size of image on the screen may not be
properly displayed.
Test Point Adj. Point Mode Input
Tape M. EQ. Spec.
Note:
1.Operate the unit for at least 20 minutes.
2.Receive the Monoscope Pattern.
3.Adjust VR561 so that the monoscope pattern will be
90±5% of display size and circle is round.
4. Turn the Power off and on again. (Main power button
on the TV unit.)
To obtain correct horizontal size of screen
If H. Size is incorrect,
--- VR561 RF Monoscope
--- Monoscope 90±5%
Use Service remote control unit
10. PIN Cushion Adjustment
Purpose:
screen image.
Symptom of Misadjustment:
rect, vertical line of image on the screen may not be
properly displayed.
Test Point Adj. Point Mode Input
Tape M. EQ. Spec.
Note:
1.Operate the unit for at least 20 minutes.
2.Receive the Cross hatch Pattern.
3.Adjust VR562 so that the cross hatch pattern will be
straight line of display.
4. Turn the Power off and on again. (Main power button
on the TV unit.)
To obtain correct straight vertical line of
If H.Pin cushion is incor-
--- VR562 RF Cross hatch
--- Cross hatch
Use Service remote control unit
11. Cut-off Adjustment
Purpose:
screen voltage.
Symptom of Misadjustment:
dish, greenish or bluish.
To adjust the beam current of R, G, B, and
White color may be red-
Test Point Adj. Point Mode Input
---
Tape M. EQ. Spec.
--- Pattern Generator
Screen Control FBT --- Main CBA
Note:
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 ▼ " button on the Service remote
control unit and select " C/D " mode. (Display
changes " C/D ", "VCO ", " 7F " and " FRENCH ",
"STEREO TYPE", "ACCESS CODE", "VIDEO
TONE", "SB SOUND" and "COMB FILTER" cyclically when " VOL ▼ " 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 until the horizontal line appears. Adjust
the Red Cut off by pressing the " CH ▲ / ▼ " buttons.
Proceed to Step 5 when 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 ▲ / ▼ " buttons. Proceed
to step 6 when the Green Cut off adjustment is done.
6.Press the " 3 " button. The display will momentarily
show " CUT OFF B " (B=Blue). Adjust the Blue cut
off by pressing the " CH ▲ / ▼ " buttons. When done
with steps 4, 5 and 6 the horizontal line should be
pure white if not,then attempt the Cut off adjustment
again.
Screen-Control
CH ▲ / ▼ buttons
Figure
PATTERN GENERATOR
RF INPUT
RF
See Reference
Notes below.
Black
Raster
Fig. 2
5-5 L1522EA
12. White Balance Adjustment
Purpose:
for pure white.
Symptom of Misadjustment:
or reddish.
Test Point Adj. Point Mode Input
Screen CH ▲ / ▼ buttons RF
To mix red, green and blue beams correctly
White becomes bluish
Raster
(APL 100%)
Tape M. EQ. Spec.
Pattern Generator,
Color analyzer
Figure
See below
White
Confirm that Cut Off Adj. is correct after this
Note:
adjustment, and attempt Cut Off Adj. if needed.
13. Sub-Brightness Adjustment
Purpose:
Symptom of Misadjustment:
correct, proper brightness cannot be obtained by adjusting the Brightness Control.
Test Point Adj. Point Mode Input
To get proper brightness.
If Sub-Brightness is in-
---
Tape M. EQ. Spec.
--- Pattern Generator See below
CH
▲ / ▼ buttons
Figure
RF IQW
AAA
Color Analyzer
Use Service remote control unit
Note:
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.Set the color analyzer to the CHROMA mode and
after zero point calibration, bring the optical receptor
to the center on the tube surface (CRT).
5.Enter the Service mode . Press " VOL ▼ " button on
the Service remote control unit and select " C/D "
mode. (Display changes " C/D ", "VCO ", " 7F " and
" FRENCH ", "STEREO TYPE", "ACCESS CODE",
"VIDEO TONE", "SB SOUND" and "COMB FILTER"
cyclically when " VOL ▼ " button is pressed.) then
Press No. 8 button on the Service remote control
Unit.
6. Press No. 4 button 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 ▲ / ▼ " button to
adjust the values of color.
8.Adjusting Red and Blue color so that the tempreture
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 until the Horizontal Line becomes pure white.
10.Turn off and on again to return to normal mode.
Receive APL 100% white signal and Check Chroma
temperatures become 9200K (x : 286 / y : 294) ±3%.
Fig. 3
White
IQW Setup level --- 7.5 IRE
Note:
Use Service remote control unit
1.Enter the Service mode. (See page 5-1)
Then input IQW signal from RF Input.
2. Press " MENU " button on the Service remote control unit
and Select " BRT " mode. (Display changes " BRT ", "
CNT ", " CLR ", and " TNT " cyclically when MENU button
is pressed). Press " CH ▲ / ▼ " buttons so that the bar
is just visible (See above figure).
3.Turn the power off and on again. (Main power button
on the TV unit.)
Black
This bar
just
visible
Fig. 4
5-6 L1522EA
14. Focus Adjustment
Purpose:
Symptom of Misadjustment:
incorrect, blurred images are shown on the display.
Test Point Adj. Point Mode Input
Note:
1.Operate the unit more than 30 minutes
2.Face the unit to the East and Degauss the CRT
3.Input the Monoscope Pattern.
4.Adjust the Focus Control on the FBT to obtain clear
The following 2 adjustments normally are not attempted in the field. Only when replacing the CRT
then adjust as a preparation.
Set the optimum Focus.
If Focus Adjustment is
--- Focus Control --- Monoscope
Tape M. EQ. Spec.
--- Pattern Generator See below.
Focus VR (FBT) --- Main CBA FBT= Fly Back Transformer
using Degaussing Coil.
picture.
6.Slowly push the Deflection Yoke toward bell of CRT
and set it where a uniform red field is obtained.
7.Tighten the clamp screw on the Deflection Yoke.
15-2. VRS Adjustment
1.Connect Oscilloscope and get the cross hatch pattern.
2.Adjust the two magnets for VRS adjustment like the
below figure so that the cross hatch pattern becomes flat.
16-1. Convergence Adjustment
Purpose:
and blue beams.
Symptom of Misadjustment:
ment is incorrect, the edge of white letters may have
color edges.
To obtain proper convergence of red, green
If Convergence Adjust-
15-1. Purity Adjustment
Purpose:
Symptom of Misadjustment:
ment is incorrect, large areas of color may not be
properly displayed.
Test Point Adj. Point Mode Input
GREEN
1.Set the unit facing east.
2.Operate the unit for over 30 minutes before adjust-
3.Fully degauss the unit using an external degaussing
4.Loosen the screw on the Deflection Yoke Clamper
5. Loosen the Ring Lock and adjust the Purity Magnets
To obtain pure color.
If Color Purity Adjust-
---
Deflection Yoke
Purity Magnet
--- Red Color
Tape M. EQ. Spec.
--- Pattern Generator See below.
Figure
RED
BLUE
Fig. 5
ing.
coil.
and pull the Deflection Yoke back away from the
screen. (See Fig. 6)
so that a red field is obtained at the center of the
screen. Tighten Ring Lock. (See Fig. 5,6)
Test Point Adj. Point Mode Input
---
C.P. Magnet(RB),
C.P. Magnet(RB-G),
Deflection Yoke
---
Dot Pattern
or
Crosshatch
Tape M. EQ. Spec.
--- Pattern Generator See below.
Figures
22mm
6-polar convergence magnet
4-polar convergence magnet
Deflection Yoke
VRS magnet
Purity magnet
Fig. 6
C.P. MAGNET (RB)
R
R
G
B
B
Fig. 7
C.B. MAGNET (RB-G)
RB
RB
G
Fig. 8
G
G
5-7 L1522EA
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