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PA No. 0209
51F710A/DP55
57F710A/DP55
SERVICE MANUAL 65F710A/DP55
DP55
NTSC C h a ss is
R/C: CLU-4351UG2
SERVICE MANUAL REVISION HISTORY INFORMATION
DATE REVISON # REASON
June , 05 SM00001 FIRST ISSUE OF MANUAL
Sept 19 FINAL
Jan 25, 06 Font repair
10.18.2006 CH 1 Deleted step 2.f. which refers to an older style remote.
02.13.2007 CH 2 Revised Cut Off instructions.
05.03.2007 CH 3 Changed left directional remote cursor button to "Decrease"
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
PROJECTION COLOR TELEVISION
JUNE 2005 HHEA-MANUFACTURING DIVISION
PA No. 0209
51F710A
57F710A
SERVICE MANUAL 65F710A
DP55
NTSC C h a ss is
R/C: CLU-4351UG2
TO GO TO A CHAPTER, CLICK ON ITS HEADING BELOW
CONTENTS
IMPORTANT SAFETY INSTRUCTIONS .............................................................................. 2
SERVICING PRECAUTIONS .............................................................................................. 6
TECHNICAL CAUTIONS .................................................................................................... 11
SPECIFICATIONS .............................................................................................................. 13
GENERAL INFORMATION..................................................................................................14
REMOTE CONTROL GUIDE ...............................................................................................20
SERVICE ADJUSTMENTS .................................................................................................25
PROTECTION CIRCUIT BLOCK DIAGRAM ......................................................................91
TROUBLESHOOTING FLOW CHART ................................................................................93
BLOCK DIAGRAM ...........................................................................................................101
CONNECTION DIAGRAM ......................................................................................................102
COMPONENT LOCATION DRAWING .................................................................................103
FINAL WIRING DIAGRAM ..................................................................................................108
QUICK DISASSEMBLY GUIDE ......................................................................................................114
WAVEFORMS ............................................................................................................125
DC VOLTAGE TABLES ......................................................................................................129
CIRCUIT SCHEMATIC DRAWING .......................................................................................................133
PRINTED CIRCUIT BOARDS ...........................................................................................151
REPLACEMENT PARTS LIST ..........................................................................................162
QUICK REFERENCE PARTS LIST (IC & UNIT) ..............................................................184
CAUTION: These servicing instructions are for use by qualified service personnel only. To reduce the risk of
electric shock do not perform any servicing other than that contained in the operating instructions
unless you are qualified to do so. Before servicing this chassis, it is important that the service
technician read the "IMPORTANT SAFETY INSTRUCTIONS" in this service manual.
SAFETY NOTICE
USE ISOLATION TRANSFORMER WHEN SERVICING
Components having special safety characteristics are identified by a ! on the schematics and on the parts list in this
Service Data and its supplements and bulletins. Before servicing the chassis, it is important that the service technician
read and follow the "Important Safety Instructions" in this Service Manual.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
PROJECTION COLOR TELEVISION
SEPT 2005 HHEA-MANUFACTURING DIVISION
DP55
IMPORTANT SAFETY INSTRUCTIONS
USE ISOLATION TRANSFORMER WHEN SERVICING
Components having special safety characteristics are identified by a ! on the schematics and on the parts list in this service manual
and its supplements and bulletins. Before servicing this chassis, it is important that the service technician read and follow the
"Important Safety Instructions" in this Service Manual.
For continued X-Radiation protection, replace picture tube with original type or Hitachi approved equivalent type.
This Service Manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified
technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex products
such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void warranty. If you are not
qualified to perform the repair of this product properly and safely, you should not risk trying to do so and refer the repair to a
qualified service technician.
WARNING
This product contains lead. Dispose of this product in accordance with applicable environmental laws. For
product recycling and disposal information, contact you local government agency or the Electronic Industries
Alliance at www.eiae.org (in the US) or the Electronic Product Stewardship Canada at www.epsc.ca (in Canada).
For more information, call "1-800-HITACHI.
Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxicant which may
cause birth defects or other reproductive harm (California Health and Safety Code, Section 25249.5).
When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin contact with solder.
Also, when soldering do not inhale any smoke or fumes produced.
This television receiver provides display of television closed captioning in accordance with section 15.119 of the FCC rules.
Do not place any objects on the top of the television which may fall or cause a child to climb to retrieve the objects.
Projection TV's are heavy and can mark or damage floor surfaces (especially wood flooring) if moved improperly. Do not slide or
force TV into position. Always roll TV allowing casters at bottom of unit to help steep and position the TV.
PREVENTION OF SCREEN BURN
This wide screen TV is designed to display wide screen pictures. Images hould be viewed mostly in wide screen format or zoomed to
fit the screen with moving pictures. Use of side panels, top and bottom panels of standard picture formats should only be 15% of your
total viewing time to prevent uneven aging of the phosphors. Phosphors in the lighted area of the picture will age more rapidly than
the gray areas. Continuous on-screen displays such as video games, stock market quotations, computer generated grphics, and
other fixed (non-moving) patters can cause permanent damage to television receivers. Such "SCREEN BURNS" constitute misuse
and are NOT COVERED by your HITACHI Factory Warranty.
PUBLIC VIEWING OF COPYRIGHTED MATERIAL
Pulic viewing of programs broadcast by TV stations and cable companies, as well as prgrams from other sources, may require prior
authorization from the broadcaster or owner of the video program material.
This product incorporates copyright protection technology that is protected by U.S. patents and other intellectual property rights. Use
of this copyright protection technology must be authorized by Macrovision Corporation, and is intended for home and other limited
consumer uses only unless otherwise authorized by Mcrovision. Reverse engineering or disassembly is prohibited.
FEDERAL COMMUNICATIONS COMMISSION NOTICE
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
· Reorient or relocate the receiving antenna.
· Increase the separation between the equipment and the receiver.
· Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
· Consult the dealer or an experienced radio/television technician for help.
This digital television is capable of receiving analog basic, digital basic and digital premium cable television programming by direct
connection to a cable system providing such programming. A CableCARD provided by your cable operator is required to view
encrypted digital programing. Certain advanced and interactive digital cable services such as video-on-demand, a cable operator's
enhanced program guide and data-enhanced television services may require the use of a set-top-box. For more information call your
local cable company.
2
TABLE OF CONTENTS
DP55
IMPORTANT SAFETY INSTRUCTION
1. Before returning an instrument to the customer, always
make a safety check of the entire instrument, including
but not limited to the following items. (READING
a. Be sure that no built-in protective devices are SHOULD NOT
LEAKAGE BE ABOVE 0.5MIU)
defective and/or have been deleted during servicing. CURRENT
(1) Protective shields are provided on this chassis to DEVICE TESTER
UNDER
protect both the technician and the customer. TEST
Correctly replace all missing protective shields, TEST ALL
including any removed for servicing convenience. (2) EXPOSED
When reinstalling the chassis and/or other assembly METAL SURFACES
in the cabinet, be sure to put back in place all 2-WIRE CORD EARTH
GROUND
protective devices, including but not limited to,
nonmetallic control knobs, insulating fishpaper, ALSO TEST WITH PLUG
REVERSED
adjustment and compartment covers/shields, and (USING AC ADAPTER
isolation resistor/capacitor networks. Do not operate PLUS AS REQUIRED)
this instrument or permit it to be operated without
all protective devices correctly installed and AC Leakage Test
functioning. Servicers who defeat safety features
or fail to perform safety checks may be liable for ANY MEASUREMENTS NOT WITHIN THE LIMITS
any resulting damage. SPECIFIED HEREIN INDICATE A POTENTIAL
SHOCK HAZARD THAT MUST BE ELIMINATED
b. Be sure that there are no cabinet openings through BEFORE RETURNING THE INSTRUMENT TO THE
which an adult or child might be able to insert their CUSTOMER OR BEFORE CONNECTING THE
fingers and contact a hazardous voltage. Such ANTENNA OR ACCESSORIES.
openings include, but are not limited to (1) spacing
between the picture tube and cabinet mask, (2) e. High Voltage This receiver is provided with a hold
excessively wide cabinet ventilation slots, and (3) an down circuit for clearly indicating that voltage has
improperly fitted and/or incorrectly secured cabinet increased in excess of a predetermined value.
back cover. Comply will all notes described in this Service Manual
regarding this hold down circuit when servicing, so
c. Antenna Cold Check With the instrument AC plug that this hold down circuit may correctly be operated.
removed from any AC source, connect an electrical
jumper across the two AC plug prongs. Place the f. Service Warning With maximum contrast, operating
instrument AC switch in the on position. Connect one high voltage in this receiver is lower than 32.0 kV. In
lead of an ohmmeter to the AC plug prongs tied case any component having influence on high voltage
together and touch the other ohmmeter lead in turn to is replaced, confirm that the high voltage with
each tuner antenna input, exposed terminal screw maximum contrast is lower than 32.0 kV.
and, if applicable, to the coaxial connector. If the To measure H.V. use a high impedance H.V. meter.
measured resistance is less than 1.0 megohms or Connect (-) to chassis earth and (+) to the CRT anode
greater than 5.2 megohms, an abnormality exists that button. (See the following connection diagram.)
must be corrected before the instrument is returned to
the customer. Repeat this test with the instrument AC Note: Turn power switch off without fail before the
switch in the off position. connection to the anode button is made.
d. Leakage Current Hot Check With the instrument
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 current
tester or a metering system that complies with
American National Standards Institute (ANSI) C101.0
Leakage Current for Appliances and Underwriters
Laboratories (UL) 6500, (9.1.1). With the instrument
AC switch first in the on position and then in the off Chassis
ground
position, measure from a known earth ground (metal
waterpipe, conduit, etc.) to all exposed metal parts of
the instrument (antennas, handle bracket, metal FBT
(TH02)
cabinet, screw heads, metallic overlays, control High Impedance
shafts, etc.), especially any exposed metal parts that H.V. meter High voltage
connector
offer an electrical return path to the chassis. Any
Deflection P.W.B.
current measured must not exceed 0.5 MIU. Reverse
the instrument power cord plug in the outlet and
repeat test.
3
DP55
IMPORTANT SAFETY INSTRUCTIONS
g. X-radiation TUBE: The primary source of X- h. X-radiation Shield
radiation in this receiver is the picture tube. The tube 1. This receiver is provided with X-ray shield plates
utilized for the above mentioned function in this for protection against X-radiation. Do not remove
chassis is specially constructed to limit X-radiation X-ray shield plates A, B, or C shown in Fig. 1
emissions. unnecessarily, when troubleshooting and/or
For continued X-radiation protection, the replacement making test measurements.
tube must be the same type as the original, Hitachi 2. To prevent X-radiation, after replacement of
approved type. picture tube and lens, confirm these components
When troubleshooting and making test measure- to be fixed correctly to bracket and cabinet, and
ments in a receiver with a problem of excessive high not to be taken off easily.
voltage, avoid being unnecessarily close to the pic-
ture tube and the high voltage component.
Do not operate the chassis longer than is necessary
to locate the cause of excessive voltage.
RED PRT ASS'Y
GREEN PRT ASS'Y
BLUE PRT ASS'Y
Shield Plate A
Glass Lens for Shielding
Shield Plate B
Shield Plate C
Shield Plate C
Shield Plate D
Detailing X-radiation shield
Fig. 1. Installation of shield lens, shield cover and shield plates (oblique view).
4
DP55
IMPORTANT SAFETY INSTRUCTIONS
2. Read and comply with all caution and safety-related 7. Components, parts, and/or wiring that appear to have
notes on or inside the receiver cabinet, on the overheated or are otherwise damaged should be
receiver chassis, or on the picture tube. replaced with components, parts, or wiring that meet
original specifications. Additionally, determine the
cause of overheating and/or damage and, if
3. Design Alteration Warning Do not alter or add to necessary, take corrective action to remove any
the mechanical or electrical design of this TV receiver. potential safety hazard.
Design alterations and additions including but not
limited to circuit modifications and the addition of 8. PRODUCT SAFETY NOTICE Many TV electrical
items such as auxiliary audio and/or video output and mechanical parts have special safety-related
connectors, might alter the safety characteristics of characteristics some of which are often not evident
this receiver and create a hazard to the user. Any from visual inspection, nor can the protection they
design alterations or additions may void the give necessarily be obtained by replacing them with
manufacturer's warranty and may make you, the components rated for higher voltage, wattage, etc.
servicer, responsible for personal injury or property Parts that have special safety characteristics are
damage resulting therefrom. identified in Hitachi service data by shading on
schematics and by a ! in the parts list. Use of
substitute replacement that does not have the same
4. Picture Tube Implosion Protection Warning The
safety characteristics as the recommended replace-
picture tube in this receiver employs integral
ment part in Hitachi service data parts list might
implosion protection. For continued implosion
protection, replace the picture tube only with one of create shock, fire, and/or other hazards. Product
the same type number. Do not remove, install, or safety is under review continuously and new
otherwise handle the picture tube in any manner instructions are issued whenever appropriate. For the
without first putting on shatterproof goggles equipped latest information, always consult the appropriate
with side shields. People not so equipped must be current Hitachi service literature. A subscription to, or
kept safely away while picture tubes are handled. additional copies of service literature may be obtained
Keep the picture tube away from your body. Do not at a nominal charge from Hitachi.
handle the picture tube by its neck.
5. Hot Chassis Warning a. Some TV receiver chassis
are electrically connected directly to one conductor of
the AC power cord and may be safely 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. Confirm that the
AC power plug is inserted correctly with an AC
voltmeter by measuring 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 chassis and earth
ground regardless of the AC plug polarity. These
chassis can be safely 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. c. Some TV receiver
chassis have a secondary ground 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
insulating 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
wiring. Always inspect in all areas for pinched, out-of-
plate, or frayed wiring. Do not change spacing
between components and the printed circuit board.
Check AC power cord for damage.
5
DP55
SERVICING PRECAUTIONS
CAUTION: Before servicing instruments covered by this 7. Do not apply AC power to this instrument and/or any of its
service data and its supplements and addenda, read and electrical assemblies unless all solid-state device heat-
follow the "Important Safety Instructions" on page 3 of this sinks are correctly installed.
publication.
NOTE: If unforeseen circumstances create conflict between 8. Always connect the test instrument ground lead to the
the following servicing precautions and any of the safety appropriate instrument chassis ground before connecting
precautions on page 3 of this publication, always follow the the test instrument positive lead. Always remove the test
safety precautions. Remember: Safety First. instrument ground lead last.
General Servicing Guidelines 9. Use with this instrument only the test fixtures specified in
1. Always unplug the instrument AC power cord from the AC this service data.
power source before: CAUTION: Do not connect the test fixture ground strap
a. Removing or reinstalling any component, circuit to any heatsink in this instrument.
board, module, or any other instrument assembly.
Electrostatically Sensitive (ES) Devices
b. Disconnecting or reconnecting any instrument Some semiconductor (solid state) devices can be damaged
electrical plug or other electrical connection. easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
c. Connecting a test substitute in parallel with an typical ES devices are integrated circuits and some field-
electrolytic capacitor in the instrument. effect transistors and semiconductor "chip" components. The
CAUTION: A wrong part substitution or incorrect following techniques should be used to help reduce the
polarity installation of electrolytic incidence of component damage caused by static electricity.
capacitors may result in an explosion
hazard. 1. Immediately before handling any semiconductor
component or semiconductor-equipped assembly, drain
d. Discharging the picture tube anode. off any electrostatic charge on your body by touching a
known earth ground. Alternatively, obtain and wear a
2. Test high voltage only by measuring it with an appropriate commercially available discharging wrist strap device,
high voltage meter or other voltage measuring device which should be removed for potential shock reasons
(DVM, FETVOM, etc.) equipped with a suitable high prior to applying power to the unit under test.
voltage probe. Do not test high voltage by "drawing an
arc." The H.V. Distribution Box has an internal 400M 2. After removing an electrical assembly equipped with ES
resistor (bleeder resistor) connected from the high devices, place the assembly on a conductive surface
voltage to ground. After power is removed from the such as aluminum foil, to prevent electrostatic charge
instrument the high voltage will discharge through the buildup or exposure of the assembly.
high voltage bleeder resistor. If the tubes have high
voltage after power is removed, then the bleeder resistor 3. Use only a grounded-tip soldering iron to solder or
is defective or the bleeder ground is disconnected. desolder ES devices.
3. Discharge the picture tube's anode at any of the R, G, or 4. Use only can anti-static type solder removal device.
B outputs on the H.V. Distribution Box only by (a) first Some solder removal devices not classified as "anti-
connecting one end of an insulated clip lead to the static" can generate electrical charges sufficient to
degaussing or kine aquadag grounding system shield at damage ES device.
the point where the picture tube socket ground lead is
connected, and then (b) touch the other end of the 5. Do not use freon-propelled chemicals. These can
insulated clip lead to the picture tube high voltage generate electrical charges sufficient to damage ES
distribution box R, G, or B output, using an insulated devices.
handle to avoid personal contact with high voltage.
6. Do not remove a replacement ES device from its
4. Do not spray chemicals on or near this instrument or any protective package until immediately before you are
of its assemblies. ready to install it. (Most replacement ES devices are
packaged with leads electrically shorted together by
5. Unless specified otherwise in these service data, clean conductive foam, aluminum foil or comparable conductive
electrical contracts by applying the following mixture to material.)
the contacts with a pipe cleaner, cotton-tipped stick or
comparable nonabrasive applicator: 10% (by volume) 7. Immediately before removing the protective material from
Acetone and 90% (by volume) isopropyl alcohol (90%- the leads of a replacement ES device, touch the
99% strength). protective material to the chassis or circuit assembly into
CAUTION: This is a flammable mixture. Unless which the device will be installed.
specified otherwise in these service data, CAUTION: Be sure no power is applied to the chassis or
lubrication of contacts is not required. circuit, and observe all other safety
precautions.
6. Do not defeat any plug/socket B+ voltage interlocks with
which instruments covered by this service data might be 8. Minimize bodily motions when handling unpackaged
equipped. replacement ES devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the
lifting of your foot from a carpeted floor can generate
static electricity sufficient to damage an ES device.)
6
TABLE OF CONTENTS
DP55
SERVICING PRECAUTIONS
General Soldering Guidelines Removal
1. Use a grounded-tip, low-wattage soldering iron and 1. Desolder and straighten each IC lead in one operation by
appropriate tip size and shape that will maintain tip gently prying up on the lead with the soldering iron tip as
temperature within the range 500°F to 600°F. the solder melts.
2. Use an appropriate lead free solder (see page 10). Lead 2. Draw away the melted solder with an anti-static suction-
solder can be used, but there is a possibility of failure due type solder removal device (or with solder braid) before
to insufficient strength of the solder. removing the IC.
3. Keep the soldering iron tip clean and well-tinned. Replacement
1. Carefully insert the replacement IC in the circuit board.
4. Thoroughly clean the surfaces to be soldered. Use a
small wire-bristle (0.5 inch or 1.25 cm) brush with a metal 2. Carefully bend each IC lead against the circuit foil pad
handle. Do not use freon-propelled spray-on cleaners. and solder it.
5. Use the following desoldering technique. 3. Clean the soldered areas with a small wire-bristle brush.
a. Allow the soldering iron tip to reach normal (It is not necessary to reapply acrylic coating to areas.)
temperature (500°F to 600°F).
"Small-signal" Discrete Transistor Removal/Replacement
b. Heat the component lead until the solder melts. 1. Remove the defective transistor by clipping its leads as
Quickly draw away the melted solder with an anti- close as possible to the component body.
static, suction-type solder removal device or with
solder braid. 2. Bend into a "U" shape the end of each of three leads
CAUTION: Work quickly to avoid overheating the remaining on the circuit board.
circuit board printed foil.
3. Bend into a "U" shape the replacement transistor leads.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach normal 4. Connect to replacement transistor leads to the
temperature (500°F to 600°F). corresponding leads extending from the circuit board and
crimp the "U" with long nose pliers to insure metal to
b. First, hold the soldering iron tip and solder strand metal contact, then solder each connection.
against the component lead until the solder melts.
Power Output Transistor Devices Removal/Replacements
c. Quickly move the soldering iron tip to the junction of 1. Heat and remove all solder from around the transistor
the component lead and the printed circuit foil, and leads.
hold it there only until the solder flows onto and
around both the component lead and the foil. 2. Remove the heatsink mounting screw (if so equipped).
CAUTION: Work quickly to avoid overheating the
circuit board printed foil or components. 3. Carefully remove the transistor from the circuit board.
d. Closely inspect the solder area and remove any 4. Insert new transistor in circuit board.
excess or splashed solder with a small wire-bristle
brush. 5. Solder each transistor lead, and clip off excess lead.
6. Replace heatsink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicularly to the
circuit board.
3. Observing diode polarity, wrap each lead of the new
Use Solding Iron to Pry Leads diode around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
IC Removal/Replacement
Some Hitachi unitized chassis circuit boards have slotted 5. Inspect (on the circuit board copper side) the solder joints
holes (oblong) through which the IC leads are inserted and of the two "original leads". If they are not shiny, reheat
then bent flat against the circuit foil. When holes are the them and, if necessary, apply additional solder.
slotted type, the following technique should be used to
remove and replace the IC. When working with boards using
the familiar round hole, use the standard technique as
outlined in paragraphs 5 and 6 above.
7
DP55
SERVICING PRECAUTIONS
Fuses and Conventional Resistor Removal/Replacement At Other Connections
1. Clip each fuse or resistor lead at top of circuit board Use the following technique to repair defective copper
hollow stake. pattern at connections other than IC Pins. This technique
involves the installation of a jumper wire on the component
2. Securely crimp leads of replacement component around side of the circuit board.
stake 1/8 inch from top.
3. Solder the connections.
CAUTION: Maintain original spacing between the
replaced component and adjacent
components and the circuit board, to
prevent excessive component
temperatures. DEFECTIVE
COPPER
Circuit Board Foil Repair REMOVED
Excessive heat applied to the copper foil of any printed
circuit board will weaken the adhesive that bonds the foil to
the circuit board, causing the foil to separate from, or "lift-
off," the board. The following guidelines and procedures
should be followed whenever this condition is encountered.
In Critical Copper Pattern Areas Insulated Jumper Wire
High component/copper pattern density and/or special
voltage/current characteristics make the spacing and 1. Remove the defective copper pattern with a sharp knife.
integrity of copper pattern in some circuit board areas more Remove at least 1/4 inch of copper, to ensure hazardous
critical than in others. The circuit foil in these areas is condition will not exist if the jumper wire opens.
designated as Critical Copper Pattern. Because Critical
Copper Pattern requires special soldering techniques to 2. Trace along the copper pattern from both wire sides of
ensure the maintenance of reliability and safety standards, the pattern break and locate the nearest component
contact your Hitachi personnel. directly connected to the affected copper pattern.
At IC Connections 3. Connect insulated 20-gauge jumper wire from the
To repair defective copper pattern at IC connections, use the nearest component on one side of the pattern break to
following procedure to install a jumper wire on the copper the lead of the nearest component on the other side.
pattern side of the circuit board. (Use this technique only on Carefully crimp and solder the connections.
IC connections.) CAUTION: Be sure the insulated jumper wire is
1. Carefully remove the damaged copper pattern with a dressed so that it does not touch
sharp knife. (Remove only as much copper as absolutely components or sharp edges.
necessary.)
Frequency Synthesis (FS) Tuning Systems
2. Carefully scratch away the solder resist and acrylic 1. Always unplug the instrument AC power cord before
coating (if used) from the end of the remaining copper disconnecting or reconnecting FS tuning system cables
pattern. and before removing or inserting FS tuning system
modules.
2. The FS tuner must never be disconnected from the FS
BARE JUMPER tuning control module while power is applied to the
WIRE instrument.
3. When troubleshooting intermittent problems that might be
caused by defective cable connection(s) to the FS tuning
CRIMP AND system, remove the instrument AC power as soon as the
SOLDER
defective connector is found and finish confirming the
bad connection with a continuity test. This procedure will
Install Jumper Wire and Solder reduce the probability of electrical overstress of the FS
system semi-conductor components.
3. Bend a small "U" in one end of a small-gauge jumper wire
and carefully crimp it around the IC pin. Solder the IC
connection.
4. Route the jumper wire along the path of the cut-away
copper pattern and let it overlap the previously scraped
end of the good copper pattern. Solder the overlapped
area, and clip off any excess jumper wire.
8
DP55
SERVICING PRECAUTIONS
NOTE: These components are affixed with glue. Be careful not to break or damage any foil under the
component or at the pins of the ICs when removing. Usually applying heat to the component for a short
time while twisting with tweezers will break the component loose.
Leadless Chip Components How to Replace Flat-lC
(surface mount) --Required Tools--
Chip components must be replaced with identical · Soldering iron · iron wire or small awl
chips due to critical foil track spacing. There are no · De-solder braids · Magnifier
holes in the board to mount standard transistors or 1. Remove the solder from all of the pins of a Flat-lC
diodes. Some chip capacitor or resistor board solder by using a de-solder braid.
pads may have holes through the board, however the
Flat-IC
hole diameter limits standard resistor replacement to De-Solder
1/8 watt. Standard capacitors may also be limited for Braid
the same reason. It is recommended that identical
chip components be used. . Soldering
Iron
Chip resistors have a three digit numerical resistance
code -1st and 2nd significant digits and a multiplier. 2. Put the iron wire under the pins of the Flat-lC and
Example: 162 = 1600 or 1.6K resistor, 0 = 0 pull it in the direction indicated while heating the
(jumper). pins using a soldering iron. A small awl can be
Chip capacitors generally do not have the value used instead of the iron wire.
Iron
indicated on the capacitor. The color of the component Wire
indicates the general range of the capacitance. Awl
Chip transistors are identified by a two letter code. The
first letter indicates the type and the second letter, the
grade of transistor. Soldering
Chip diodes have a two letter identification code as Pull Soldering Iron
Iron
per the code chart and are a dual diode pack with
either 3. Remove the solder from all of the pads of the
common anode or common cathode. Check the parts Fiat-lC by using
list for correct diode number. a de-solder braid. Soldering
Iron
Component Removal
1. Use solder wick to remove solder from component De-Solder
end caps or terminals. Braid
2. Without pulling up, carefully twist the component
with tweezers to break the adhesive. Flat-IC
3. Do not reuse removed leadless or chip
components since they are subject to stress 4. Position the new Flat-lC in place (apply the pins of
fracture during removal . the Flat-lC to the soldering pads where the pins
Chip Component Installation need to be soldered). Properly Polarity Symbol
determine the positions of the
1. Put a small amount of solder on the board soldering pads and pins by
soldering pads. correctly aligning the polarity
2. Hold the chip component against the soldering symbol.
pads with tweezers or with a miniature alligator
clip and apply heat to the pad area with a 30 watt
iron until solder flows. Do not apply heat for more 5. Solder all pins to the soldering pads using a fine
than 3 seconds tipped soldering iron.
Chip Components
TYPE
C GRADE SOLDER
CAPS
B Solder Soldering
TRANSISTOR CAPACITOR Iron
E
1ST DIGIT
6. Check with a magnifier for solder bridge between
2ND DIGIT
COMMON CATHODE the pins or for dry joint between pins and soldering
MULTIPLIER pads. To remove a solder bridge, use a de-solder
= 1600 = 1.6K braid as shown in the figure below.
De-Solder
ANODES SOLDER CAPS Braid
MH DIODE RESISTOR
Bridge Soldering
Solder Iron
9
DP55
Information for service about lead-free solder introduction
Hitachi introduced lead-free solder to conserve the "Earth Environment".
Please refer to the following before servicing.
(1) Characteristic of lead-free solder
Melting point of lead free solder is 40-50oC higher than solder containing lead.
(2) Solder for service
Following composition is recommended.
" Sn - 3.0Ag - 0.5Cu " , or " Sn - 0.7 Cu "
Lead solder can be used, but there is a possibility of failure due to insufficient strength of the solder.
Caution when using solder containing lead.
Please remove previous solder as much as possible from the soldering point.
When soldering, please perfectly melt the lead-free solder to mix well with the previous solder.
(3) Soldering iron for lead-free solder.
Melting point of lead-free solder is higher than solder containing lead.
Use of a soldering tool "with temperature control" and "with much thermal capacitance" is recommended.
(Recommended temperature control : 320oC - 450oC)
Recommended temperature
PWB with chip parts 320oC +/- 30oC
PWB without chip parts 380oC +/- 30oC
Chassis, metal, shield etc. 420oC +/- 30oC
(4) Identification of lead-free PWB
2003 models >> mixed
2004 models >> lead-free solder is introduced
2005 models >> lead-free solder apply
On lead-free PWB, "F" is added at the beginning of stamp on PWB. (e.g. F DP55)
10
DP55
TECHNICAL CAUTIONS
CAUTIONS WHEN CONNECTING / DISCONNECTING THE HV CONNECTOR
Perform the following when the
HV connector (anode connector)
is removed or inserted for CPT
replacement, etc.
Anode
connector
Deflection P.W.B.
FBT
During Removal
1. Roll out silicon cover from FBT's contact area slowly.
2. While turning the connector about 90 degrees
following the arrow (0 position), push the connector
PUSH slightly towards the case. (Fig. A)
PUSH
Fig. A
Silicon cover
3. Remove the connector slowly
by pulling it away from the
case. Wing
Wing
L Position
L Position
Fig. B
During Insertion
1. Please refer to direction for insertion as shown in Fig. B (L position). Insert connector until "CLICK" sound is heard.
2. Make sure the connector is pressed right in, so that it has a good contact with the spring.
3. Confirm the contact by pulling the connector slightly. (Don't pull hard because it may damage the connector).
4. Cover the high voltage output by carefully pushing silicon cover onto it. (Don't turn the connector).
(REMARK) Silicon Cover
1. Make sure the silicon cover is
covering the high voltage output.
less than 1mm
11
TABLE OF CONTENTS
DP55
TECHNICAL CAUTIONS
High Voltage limiter circuit operation check. 4. When the limiter circuit is operating properly, High
1. Turn off TV and connect jig as shown in Figure 2. Adjust Voltage will be less than 37 kV at 1.62mA when TV shuts
jig fully counter-clockwise for minimum resistance. down.
2. Set the AC input to 120V AC and turn on TV. 5. Turn off set immediately after checking circuit operation.
3. Confirm test pattern on CRT is a usable picture, then 6. Unplug set for one minute to reset shutdown circuit.
slowly adjust jig until the picture disappears and TV shuts Remove jig and voltmeter.
down.
(TH02)
AC CORD POLARITY
This check is based on the UL standard. Use the jigs
specified by the production technology section. The
Remove RH19 and connect 50K VR jig as shown. GND side (wider blade) of the AC power cord should
be connected to KKX1
50K VR
L901
C901
33K
50K VR 33K
Resistor R901
KKX1
X901
2
RH19
PA
TH02
FBT RH17 F901
Fig. 2. Power/Deflection P.W.B PPT1
WHITE side
GND side
Tester
12
TABLE OF CONTENTS
DP55
SPECIFICATIONS
Models: 51F710A 57F710 65F710A Intermediate Frequency: Picture l-F Carrier 45.75 MHz
Sound l-F Carrier 41.25 MHz
Color Sub Carrier 42.17 MHz
Cathode-Ray Tube:
R=P16MAB00RFA Video Input: 1 Volt p-p, 75 Ohm
G=P16MAB00HHA
B=P16MAB00BMB Video Output: 1 Volt p-p, 75 ohm
Audio Input: 470 mVrms, 47 k Ohm
Stereo Audio Output: 470 mVrms, 1 k Ohm
Power Consumption: Audio Output Power:
· Power Consumption (operating)
Front: 24 watts per channel at 10% distortion,
51/57/65F710A . . . . . . . . . . . . . . . . . . . . . .200W
· Power Consumption (maximum) 8 ohm Impedance. Max output 25 watts.
51/57/65F710A . . . . . . . . . . . . . . . . . . . . . .250W
Anode Voltage:
DP55 31.7±0.3kv (1.59±0.2mA)
Antenna Impedance: 75 Ohm Unbalanced
VHF / UHF / CATV Brightness: 51" 57" 65"
(white screen) 260cd/m2 205cd/m2 160cd/m2
Receiving Channel: BAND CH
Speakers: 51" 2 Woofers - 5 inch (12 cm) round
VHF 2~13
57" 2 Woofers - 6 inch (16 cm) round
UHF 14~69
65" 2 Woofers - 6 inch (16 cm) round
EXT. Mid (A-5)~(A-1), 4+
CATV Mid. A~I DIMENSIONS:
51F710A 57F710A 65F710A
CATV Super J~W Height (in.) 50-3/8 54-9/16 59-15/16
CATV Hyper (W+1)~(W+28) (mm) 1,279.0 1,385.6 1,521.0
Width (in.) 48-3/4 54 61
CATV Ultra (W+29)~(W+84)
(mm) 1,239.0 1,372.0 1,549.0
Depth (in.) 21-7/8 23-5/8 25-3/8
(mm) 557 599.4 644
Weight (lbs.) 187.4 205 309
(kg.) 85 93 140
Circuit Board Assemblies:
CPT (B) P.W.B. Digital Main P.W.B.
CPT (G) P.W.B Digital Sub P.W.B.
CPT (B) P.W.B.
Deflection P.W.B.
Signal P.W.B.