Effinet Systems EFG-2902F User manual

2
29 9” ” C Co ol lo or r M Mo on ni it to or r
S
SE ER RV VI IC CE E M MA AN NU UA AL L
EFG-2902F
February 2003
Effinet Systems, Inc.
No. 602 Moden Venture Town, 1673 Shingil-dong,
Youngdungpo-gu, Seoul, South Korea 150-057
Tel) 82-2-845-7062 Fax) 82-2-841-8065
http://www.effinet.co.kr [e-mail]

EFFINET CONFIDENTIAL
EFFI-Service Manual R1.0 2
TABLE of CONTENTS
SAFETY PRECAUTIONS ......................................................................................................... 5
SAFETY CHECK ..................................................................................................................... 5
FIRE & SHOCK HAZARD...................................................................................................... 5
IMPLOSION PROTECTION ................................................................................................... 5
IMPORTANT SAFETY NOTICE: ........................................................................................... 5
X-RAY ...................................................................................................................................... 6
GENERAL SAFETY INFORMATION .................................................................................... 7
TERMS IN THE MANUAL............................................................................................................. 7
TERMS AS MARKED ON EQUIPMENT .......................................................................................... 7
SYMBOLS IN THE MANUAL ........................................................................................................ 7
SYMBOLS AS MARKED ON EQUIPMENT ...................................................................................... 7
HIGH VOLTAGE WARNING & CRITICAL COMPONENT WARNING LABEL................................... 7
SERVICING PRECAUTIONS .................................................................................................. 8
GENERAL SERVICING PRECAUTIONS ......................................................................................... 8
ELECTRO-STATICALLY SENSITIVE (ES) DEVICES ...................................................................... 9
GENERAL SOLDERING GUIDELINES ......................................................................................... 10
IC REMOVAL/REPLACEMENT .................................................................................................. 11
REMOVAL................................................................................................................................. 11
REPLACEMENT ........................................................................................................................ 11
“SMALL-SIGNAL” DISCRETE TRANSISTOR REMOVAL / REPLACEMENT .................................. 11
POWER IC, TRANSISTOR OR DEVICES REMOVAL/REPLACEMENT ........................................... 11
BRIEF SPECIFICATION ........................................................................................................ 12
GENERAL INFORMATION................................................................................................... 13
ABBREVIATIONS ...................................................................................................................... 13
CAUTIONS FOR ADJUSTMENT AND REPAIR.............................................................................. 13
CAUTION FOR SERVICING........................................................................................................ 13
PIN CONNECTION DIAGRAM ............................................................................................ 14
15PIN D-SUB TYPE................................................................................................................... 14
25PIN AMP CONNECTOR TYPE................................................................................................ 14

EFFINET CONFIDENTIAL
EFFI-Service Manual R1.0 3
INSTALLATION AND ADJUSTMENT PROCEDURES..................................................... 15
ADJUSTMENT CONDITION ....................................................................................................... 15
VOLTAGE ADJUSTMENT ........................................................................................................... 15
IMAGE ADJUSTMENT ............................................................................................................... 16
TROUBLESHOOTING GUIDE.............................................................................................. 22
POWER SUPPLY CIRCUITRY FAILURE....................................................................................... 23
HORIZONTAL DEFLECTION CIRCUITRY FAILURE ..................................................................... 24
H-SIZE CONTROL IS NOT OPERATED......................................................................................... 25
ABNORMAL HORIZONTAL SCREEN SIZE .................................................................................. 25
PINCUSHION, TRAPEZOIDAL TROUBLE.................................................................................... 26
PARALLELOGRAM, PIN-BALANCE TROUBLE........................................................................... 26
TILT(ROTATION) TROUBLE ...................................................................................................... 27
VERTICAL DEFLECTION FAILURE ............................................................................................ 28
VERTICAL SIZE, CENTER TROUBLE ......................................................................................... 29
DYNAMIC FOCUS TROUBLE..................................................................................................... 30
NO VIDEO / MISSING COLOR TROUBLE ................................................................................... 31
MI-COM FAILURE..................................................................................................................... 32
OSD FAILURE .......................................................................................................................... 33
KEY CONTROL TROUBLE......................................................................................................... 34
KEY CONTROL TROUBLE......................................................................................................... 34
VISIBLE HORIZONTAL & VERTICAL RETRACE LINE................................................................ 35
FOCUS TROUBLE...................................................................................................................... 36
KEY COMPONENT SPECIFICATION................................................................................. 37
DEFLECTION PROCESSOR(S1D2511B01) ........................................................................ 37
VERTICAL DEFLECTION OUTPUT CIRCUIT(KA2142).............................................................. 39
OSD PROCESSOR (S5D2508A) ............................................................................................... 40
POWER SWITCH (STR-F6658B) .............................................................................................. 42
VIDEO AMPLIFIER (S1D2500A01) .......................................................................................... 43
MONOLITHIC TRIPLE CRT DRIVER (LM2415)........................................................................ 45
POWER FACTOR CONTROLLER (MC33260)............................................................................. 46
REPLACEMENT PART LIST ................................................................................................ 47
MAIN BOARD ....................................................................................................................... 47
CRT BOARD .......................................................................................................................... 51
CONTROL BOARD .................................................................................................................. 52
OTHERS.................................................................................................................................... 53

EFFINET CONFIDENTIAL
EFFI-Service Manual R1.0 4
* PFC BOARD(OPTION)......................................................................................................... 53
BLOCK DIAGRAM ................................................................................................................. 54
CONNECTION DIAGRAM .................................................................................................... 55
SCHEMATIC DIAGRAM ....................................................................................................... 56
REFERENCE WAVEFORM.................................................................................................... 60

EFFINET CONFIDENTIAL
EFFI-Service Manual R1.0 5
SAFETY PRECAUTIONS
CAUTION : No modifications of any circuits should be attempted. Service work should be
performed only after you are thoroughly familiar with all of the following safety checks and
servicing guidelines.
SAFETY CHECK
Care should be taken while servicing this analog color display because of the high
voltages used in the deflection circuits. These voltages are exposed in such areas as the
associated Fly-back transformer and yoke circuits.
FIRE & SHOCK HAZARD
 Insert an isolation transformer between the analog color display and AC power
line before servicing the chassis.
 When servicing, pay close attention to the original lead dress especially in the
high voltage circuit area; if a short circuit is found, replace all parts which have
been overheated as a result of the short circuit.
 All the protective devices must be reinstalled per original design.
 Soldering must be inspected for possible cold solder points, frayed leads,
damaged insulation, solder splashes or sharp solder points. Be certain to remove
all foreign materials.
IMPLOSION PROTECTION
Picture tube in this monitor employs integral implosion protection system, but care
should be taken to avoid damage and scratching during installation.
Only use same type replacement picture tubes.
IMPORTANT SAFETY NOTICE:
There are special components used in this analog color display, which are important
for safety. These parts are marked on the schematic diagram and on the
replacement parts list. It is essential that these critical parts should be replaced with
manufacturer’s specified parts to prevent X-Ray, shock, fire or other hazards. Do
not modify the original design without getting written permission from EFFINET
SYSTEMS, Inc. or this will void the original parts and labor warranty.

EFFINET CONFIDENTIAL
EFFI-Service Manual R1.0 6
SAFETY PRECAUTIONS
X-RAY
WARNING : The only potential source of X-Ray is the picture tube. However when the
high voltage circuitry is operation properly, there is no possibility of an X-
Ray problem. The basic precaution which must be exercised is to keep the
high voltage at the following factory recommended level.
NOTE : It is important to use an accurate, periodically, calibrated high voltage meter.
 To measure the high voltage, use a high-impedance high-voltage meter.
Connect(-) to chassis and (+) to the CRT anode button.
 Turn the Contrast & Brightness Control fully counterclockwise.
 Measure the high voltage. The high voltage meter should indicate the
following factory recommended levels,
 If the upper meter indication exceeds the maximum level, immediate service
is required to prevent the possibility of premature component failure.
 To prevent X-Ray possibility, it is essential to use the specified picture tube.
 The normal high voltage is 27KV or below and must not exceed 29KV at
zero beam current at rated voltage.

EFFINET CONFIDENTIAL
GENERAL SAFETY INFORMATION
Terms in the manual
CAUTION Statements identify conditions or practices that could result in
damage to the equipment or other property.
WARNING Statements identify conditions or practices that could result in
personal injury or loss of life.
Terms as marked on equipment
CAUTION Statements indicate a personal injury hazard not immediately
accessible
as one reads the marking or a hazard which properly included on the
equipment itself.
WARNING Statements are clearly concerning indicated personal injury hazards.
Symbols in the manual
The symbols indicate where applicable cautionary or other information is to be found.
Symbols as marked on equipment
Protective GROUND terminal
High Voltage Warning & Critical Component Warning Label
The following warning label is on the CRT or metal case of the Monitor.
Warning: This product includes critical mechanical and electrical parts which are
essential for x-ray protection. For continued safety, replace critical components that
are indicated in the service manual with exact replacement parts given in the parts list.
Operating high voltage with this product is 29KV at minimum brightness. Refer to
service manual for measurement procedures and proper service adjustments.
EFFI-Service Manual R1.0 7

EFFINET CONFIDENTIAL
EFFI-Service Manual R1.0 8
SERVICING PRECAUTIONS
CAUTION : Before servicing instruments covered by this service manual, its supplements,
and addendum, please read and follow the SAFETY PRECAUTIONS of this manual.
NOTE : If unforeseen circumstances create conflict between the following servicing
precautions and any of the safety precautions on page 3 of this manual, always follow the
safety precautions.
General Servicing Precautions
1. Always unplug the AC power cord from source before:
 Removing or reinstalling any component, circuit board, module, or any
other instrument assembly.
 Disconnecting or reconnecting any electrical plug or other electrical
connection
 Connecting a test substitute in parallel with an electrolytic capacitor in the
instrument.
CAUTION : A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in a explosion.
 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 line grounding system shield at the point where the
picture tube socket ground lead is connected, and then (b) touching the other end of
the insulated clip lead to the picture tube anode button, using an insulating handle to
avoid personal contact with high voltage.
4. Do not any spray chemicals on or near this instrument, or any of its assemblies.
5. Unless otherwise specified in this service manual, only clean electrical contacts by
applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick,
or comparable nonabrasive applicator:10%(by volume) Aceton and 90%(by volume)
isopropyl alcohol(90%-99% strength).
CAUTION : This is a flammable mixture. Unless specified in this service manual,
lubrication of contacts is not required.

EFFINET CONFIDENTIAL
EFFI-Service Manual R1.0 9
SERVICING PRECAUTIONS
6. Do not damage any plug/socket B+ voltage interlocks with which instruments
covered by this service manual might be equipped.
7. Do not apply AC power to this instrument and/or any other of its electrical
assemblies unless all the solid-state device heat sinks are correctly installed.
8. Always connect the test instrument ground lead to the appropriate instrument chassis
ground before connecting the test instrument positive lead. Always remove the test
instrument ground lead last.
9. Only use the test fixtures specified in this service manual with this instrument.
CAUTION : Do not connect the test fixture ground strap to any heat-sink in this
instrument.
Electro-statically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity.
Such components are commonly called Electro-statically Sensitive (ES) Devices.
The typical examples of ES devices are integrated circuits, some field-effect transistors,
and semiconductor “chip” components. The following techniques should be used to help
reduce the incidence of component damage by static electricity.
1. Immediately before handling any semiconductor or semiconductor-equipped
assembly, wipe off any electrostatic charge on your body by touching any known
earth ground. Alternatively, obtain any commercially available discharging wrist
strap device which should be removed for potential shock reasons point to applying
power to the unit under testing conditions.
2. After removing the electrical assembly equipped with ES devices, place the assembly
on a conductive surface such as aluminum foil to prevent electrostatic charge buildup
or exposure to the assembly.
3. Only use a grounded-tip soldering iron to solder it unsolder ES device.
4. Only use an anti-static type solder removal device. Some solder removal devices not
classified as “anti-static” can generate enough electrical charges to damage ES
devices.
5. Do not use Freon-propelled chemicals. These can generate enough electrical charges
to damage ES devices.

EFFINET CONFIDENTIAL
EFFI-Service Manual R1.0 10
SERVICING PRECAUTIONS
6. Do not remove a replacement 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 together by conductive foam, aluminum foil,
or comparable conductive material).
7. Immediately before removing the protective material from the leads of replacement
ES devices, touch the protective material to the chassis or circuit assembly into which
the device will be installed.
CAUTION : Be sure that no power is applied to the chassis or circuit, and observe
all other safety precautions.
8. Minimize bodily movements when handling unpackaged replacement Es devices.
(Otherwise harmful motion such as the brushing together clothes fabric or the lifting
your foot from a carpeted floor can generate enough static electricity to damage ES
devices).
General soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron with appropriate tip size and shape
that will maintain tip temperature between a 550˚F-660˚F(288˚C-316˚C)range.
2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts
lead.
3. Keep the soldering iron clean.
4. Clean the surface to be soldered. Use a small wire-bristle(0.5 inch or 1.25cm) brush
with a metal handle. Do not use Freon-propelled spray-on cleaners.
5. Use the following soldering technique:
 Allow the soldering iron tip to reach normal temperature (550˚F to 660˚F or 288˚
C to 316˚C)
 Hold the soldering iron tip and solder strand against the component lead the
solder melts.
 Quickly move the soldering iron tip to the junction of the component lead and
the printed circuit foil, and hold it there until the solder flows onto and around
both the component lead and foil.
 Closely inspect the solder area and remove any excess or splashed solder with a
small wire-bristle brush.