Magnavox MGD134 Schematic
SERVICE MANUAL
13" COLOR TV/DVD
MGD134
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1-1
Laser Beam Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2-1
Important Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3-1
Standard Notes for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4-1
Cabinet Disassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5-1
Electrical Adjustment Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6-1
FIRMWARE Renewal Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-1
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-1
Schematic Diagrams / CBA’s and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9-1
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10-1
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-1
System Control Timing Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12-1
IC Pin Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13-1
Lead Identifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-1
Exploded Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15-1
Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16-1
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17-1
Manufactured under license from Dolby Laboratories. "Dolby" and
the double-D symbol are trademarks of Dolby Laboratories.
SPECIFICATIONS
< TV Section >
*Test input terminal
<Except Tuner>-------------Video input (1Vp-p)
Audio input (-10dB)
<Tuner>-----------------------Ant. input (80dBµV) Video: 87.5%
Audio: 25kHz dev (1kHz Sin)
<DEFLECTION>
Description Condition Unit Nominal Limit
1. Over Scan — % 90 —
Horizontal % — ±15
2. Linearity
3. High Voltage — kV 22 —
<VIDEO & CHROMA>
Description Condition Unit Nominal Limit
Vert ical % — ±10
Center m/m — 0.4
1. Misconvergence
2. Tint Control Range — deg ±30 —
3. Contrast Control Range — dB 12 2
4. Brightness (100% White Full Field) Contrast: Max ft-L 55 40
5. Color Temperature — K 9200 —
Corner m/m — 2.1
Side m/m — 1.5
<TUNER>
Description Condition Unit Nominal Limit
1. Video S/N (80dBµV, TV4ch) — dB 45 40
2. Audio S/N (W/LPF) — dB 45 40
3. Audio Output Power at Speaker — W 1 0.8
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.
1-1-1 T8001SP
<DVD Section>
ITEM CONDITIONS UNIT NOMINAL LIMIT
Coaxial Digital Out 75 ohm load mVpp 500 ± 100
NOTES:
1. All Items are measured without pre-emphasis unless otherwise specified.
2. Power supply : AC120 V 60 Hz
3. Load imp. : 100 k ohm
4. Ambient temperature: +25
°C
1-1-2 T8001SP
LASER BEAM SAFETY PRECAUTIONS
This DVD player uses a pickup that emits a laser beam.
Do not look directly at the laser beam coming
from the pickup or allow it to strike against your
skin.
The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep
your eyes at least 30cm away from the pickup lens when the diode is turned on. Do not look directly at the laser
beam.
Caution: Use of controls and adjustments, or doing procedures other than those specified herein, may result in
hazardous radiation exposure.
Drive Mecha Assembly
Laser Beam Radiation
Laser Pickup
Turntable
WHEN OPEN. DO NOT
CAUTION
LASER RADIATION
STARE INTO BEAM.
Location: Top of DVD mechanism.
1-2-1 E5_LASER
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 custom-
er, always make a safety check of the entire instru-
ment, including, but not limited to, the following
items:
a. Be sure that no built-in protective devices are de-
fective 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. Do not oper-
ate this instrument or permit it to be operated
without all protective devices correctly installed and functioning. Servicers who defeat
safety features or fail to perform safety checks
may be liable for any resulting damage.
b. Be sure that there are no cabinet openings through
which an adult or child might be able to insert their
fingers and contact a hazardous voltage. Such
openings include, but are not 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 - With the instrument AC
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 - With the instru-
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 leak-
age 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
CURRENT
TESTER
EARTH
GROUND
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.
e. X-Radiation and High Voltage Limits - Because
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 servic-
1-3-1 TD204IMP
ing 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.
2. Read and comply with all caution and safety-related notes on or inside the receiver cabinet, on the
receiver chassis, or on the picture tube.
3. Design Alteration Warning - Do not alter or add
to the mechanical or electrical design of this TV receiver. Design alterations and additions, including,
but not limited to circuit 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.
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 -
a. Some TV receiver chassis are electrically connect-
ed directly to one conductor of the AC power cord
and may be 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.
b. Some TV receiver chassis normally have 85V
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.
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 insulation
material that must not be defeated or altered.
6. Observe original lead dress. Take extra care to assure correct lead dress in the following areas: a.
near sharp edges, b. near thermally hot parts be
sure that leads and components do not touch thermally hot parts, c. the AC supply, d. high voltage,
and e. antenna wiring. Always inspect in all areas
for pinched, out of place, or frayed wiring. Check
AC power cord for damage.
7. Components, parts, and/or wiring that appear to
have overheated or are otherwise damaged
should be replaced with components, parts, or wiring that meet 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 - Some electrical and 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 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.
1-3-2 TD204IMP
Precautions during Servicing
A. Parts identified by the ( # ) symbol are critical for
safety.
Replace only with part number specified.
B. In addition to safety, other parts and assemblies
are 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.
C. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
D. Use specified insulating materials for hazardous
live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers
4) Insulators for transistors.
E. When replacing AC primary side components
(transformers, power cord, etc.), wrap ends of
wires securely about the terminals before soldering.
F. Observe that the wires do not contact heat produc-
ing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.)
G. Check that replaced wires do not contact sharp
edged or pointed parts.
H. When a power cord has been replaced, check that
5~6 kg of force in any direction will not loosen it.
I. Also check areas surrounding repaired locations.
J. Be careful that foreign objects (screws, solder
droplets, etc.) do not remain inside the set.
K. Crimp type wire connector
When replacing the power transformer in sets
where the connections between the power cord
and power transformer primary lead wires are performed using crimp type connectors, in order to
prevent shock hazards, perform carefully and precisely the following steps.
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.
L. When connecting or disconnecting the TV/DVD
connectors, first, disconnect the AC plug from AC
supply socket.
1-3-3 TD204IMP
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
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
USA or
CANADA
Clearance
Distance (d), (d')
≥ 3.2 mm
(0.126 inches)
2. Leakage Current Test
Confirm the specified (or lower) leakage current between B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals,
antenna terminals, video and audio input and output
terminals, microphone jacks, earphone jacks, etc.).
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
Exposed Accessible Part
Z
One side of
B
Power Cord Plug Prongs
Fig. 1
AC Voltmeter
(High Impedance)
Fig. 2
AC Line Voltage Region Load Z Leakage Current (i) Earth Ground (B) to:
110 to 130 V
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
USA or
CANADA
0.15µF CAP. & 1.5kΩ
RES. connected in
parallel
1-3-4 TD204IMP
i≤0.5mA rms
Exposed accessible
parts
STANDARD NOTES FOR SERVICING
Circuit Board Indications
1. The output pin of the 3 pin Regulator ICs is indicated as shown:
Top View
Out
2. For other ICs, pin 1 and every 5th pin is indicated
as shown:
Pin 1
3. The 1st pin of every pin connector are indicated as
shown:
Pin 1
Input
In
Bottom View
5
10
Instructions for Connectors
1. When you connect or disconnect FFC cable (connector), be sure to disconnect the AC cord.
2. FFC cable (connector) should be inserted parallel
into the connector, not at an angle.
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
[ CBA= Circuit Board Assembly ]
Pb (Lead) Free Solder
Pb free mark will be found on PCBs used Pb free
solder. (Refer to figure.) For PCBs with Pb free
mark, be sure to use Pb free solder. For PCBs
without Pb free mark, use standard solder.
Pb free mark
How to Remove / Install Flat Pack IC
Caution:
1. The Flat Pack-IC shape may differ by models. Use
an appropriate hot-air flat pack-IC desoldering
machine, whose shape matches that of the Flat
Pack-IC.
2. Do not apply the hot air to the chip parts around the
Flat Pack-IC for over 6 seconds as damage may
occur to the chip parts. Put Masking Tape around
the Flat Pack-IC to protect other parts from damage. (Fig. S-1-2)
3. 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 solder lands under the IC when removing it.
1. Removal
With Hot - Air Flat Pack - IC Desoldering Machine:
a. Prepare the Hot - Air Flat Pack - IC Desoldering
Machine, then apply hot air to Flat Pack - IC (about
5~6 seconds). (Fig. S-1-1)
b. Remove the Flat Pack- IC with tweezers while
applying the hot air.
With Soldering Iron:
a. 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)
b. 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)
With Iron Wire:
a. 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)
1-4-1 X5SNOTE
b. Affix the wire to a workbench or solid mounting
point, as shown in Fig. S-1-5.
c. Pull up on the wire as the solder melts so as to lift
the IC leads from the CBA contact pads, while
heating the pins using a fine tip soldering iron or
hot air blower.
Note:
When using a soldering iron, care must be taken
to ensure that the Flat Pack - IC is not being held
by glue, or when it is removed from the CBA, it
may be damaged if force is used.
2. Installation
a. 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.
b. The "I" mark on the Flat Pack - IC indicates pin 1
(See Fig. S-1-6). Make sure this mark matches the
1 on the CBA when positioning for installation.
Then pre - solder the four corners of the Flat PackIC (See Fig. S-1-7).
c. Solder all pins of the Flat Pack - IC. Make sure that
none of the pins have solder bridges.
Flat Pack-IC
Fine Tip
Soldering Iron
Desoldering Braid
Soldering Iron
Fig. S-1-3
Sharp
Pin
Fig. S-1-4
CBA
Masking
Tape
Tweezers
Hot Air Blower
or
Iron Wire
Fig. S-1-1
Soldering Iron
To Solid
Mounting Point
Fig. S-1-5
Hot-air
Flat Pack-IC
Desoldering
Machine
Flat Pack-IC
Fig. S-1-2
1-4-2 X5SNOTE
Example :
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.
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.
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Presolder
CBA
Fig. S-1-6
Flat Pack-IC
Fig. S-1-7
Ground for Work Bench
Be sure to place a conductive sheet or copper plate
with proper grounding (1MΩ) on the work bench or
other surface, where the semiconductors are to be
placed. Because the static electricity charge on the
clothing will not escape through the body grounding
band, be careful to avoid contacting semiconductors to
clothing.
<Incorrect>
CBA
<Correct>
CBA
1MΩ
1-4-3 X5SNOTE
Grounding Band
1MΩ
Conductive Sheet or
Copper Plate
CABINET 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] Tray Chassis Unit[3] CRT
[4] DVD Mechanism
[5] DVD Main CBA Unit
[6] Main CBA
2. Disassembly Method
REMOVAL
ID/
LOC.
No.
[1]
[2]
[3] CRT 2 4(S-3) -
[4]
[5]
[6] Main CBA 3 5(S-7), (S-8) -
↓
(1)
PART
Rear
Cabinet
Tr ay
Chassis
Unit
DVD
Mechanism
DVD Main
CBA Unit
↓
(2)
REMOVE/
*UNHOOK/UNLOCK/
Fig.
No.
RELEASE/UNPLUG/
DESOLDER
1 4(S-1), 2(S-2) -
Anode Cap, CN1801,
2,3,
CN1802, CN505,
5
CRT CBA, CN1601,
CN1571
4(S-4), 2(S-5),
3,4,
Loader Cover,
5
CN201, CN301
2(S-6), Shield Box,
3,5
CL001, CL002
↓
(3)
↓
(4)
Note
2-1
2-2
2-3
2-4
(5)
1
3
-
↓
(1): Order of steps in Procedure. When reassembling,
follow the steps in reverse order.These numbers
are also used as the Identification (location) No. of
parts in Figures.
(2): Parts to be removed or installed.
(3): Fig. No. showing Procedure of Part Location.
(4): Identification of part to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
S=Screw, P=Spring, L=Locking Tab, CN=Connec-
tor, *=Unhook, Unlock, Release, Unplug, or Desol-
der
2(S-2) = two Screws (S-2)
(5): Refer to the following "Reference Notes in the
Table."
Reference Notes in the Table
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.
CAUTION 1: Discharge the Anode Lead of the CRT
with the CRT Ground Wire before removing the Anode
Cap.
1. Disconnect the following: Anode Cap, CN1801,
CN1802, CN505, CRT CBA, CN1601, and
CN1571.
Then remove Tray Chassis Unit.
CAUTION 2: Electrostatic breakdown of the laser
diode in the optical system block may occur as a
potential difference caused by electrostatic charge
accumulated on cloth, human body etc., during
unpacking or repair work.
To avoid damage of pickup follow next procedures.
2-1. Disconnect Connector (CN301) on the DVD Main
CBA Unit.
2-2. Remove four Screws (S-4) and lift the DVD
Mechanism up. (Fig. 3)
2-3. Short the three short lands of FPC cable with sol-
der before removing the FFC cable (CN201) from
it. If you disconnect the FFC cable (CN201), the
laser diode of pickup will be destroyed. (Fig. 4)
2-4. Remove two Screws (S-5) and Loader Cover.
CAUTION 3: When reassembling, confirm the FFC
cable (CN201) is connected completely. Then remove
the solder from the three short lands of FPC cable.
(Fig. 4)
1-5-1 T8059DC
(S-1)
(S-1)
(S-1)
(S-2)
(S-1)
[1] Rear Cabinet
Fig. 1
(S-3)
(S-3)
[3] CRT
Anode Cap
CRT CBA
(S-3)
(S-3)
Fig. 2
1-5-2 T8059DC
Loader Cover
(S-4)
[2] Tray Chassis Unit
(S-5)
(S-4)
[4] DVD Mechanism
(S-7)
(S-7)
[6] Main CBA
(S-7)
CL002
CL001
(S-7)
(S-6)
(S-7)
Shield Box
[5] DVD Main
CBA Unit
CN201
CN301
(S-8)
Fig. 3
1-5-3 T8059DC
DVD Mechanism
Short the three short lands by soldering.
(Either of two places.)
Connector
A
View for A
Fig. 4
1-5-4 T8059DC
ANODE
T
CR
DVD MAIN CBA UNIT
CRT CBA
GND
SPEAKER
CN1802
MAIN CBA
CN201
CN301
CNB1 CNA1
CL501A
SCREEN
CN505
CN1601
CL501B
FOCUS
AC CORD
CN1801
SPEAKER
CN1571
CL002 CL001
T1571
1-5-5 T8059DC
Fig. 5
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. AC Milli Voltmeter (RMS)
3. DC Voltmeter
4. Oscilloscope: Dual-trace with 10:1 probe,
V-Range: 0.001~50V/Div,
F-Range: DC~AC-60MHz
5. Frequency Counter
6. Plastic Tip Driver
7. Color Analyzer
How to make service remote control
unit:
1. Prepare remote control unit. (Part No. NE224UD)
Remove 4 screws from the back lid. (Fig. 1-1)
How to Set up the Service mode:
Service mode:
1. Use the service remote control unit.
2. Turn the power on.
3. Press "DISC MENU" button on the service remote
control unit.
1. DC 105V (+B) Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
unit does not operate correctly.
Test point Adj. Point Mode Input
J2002 (+B)
TP1405 (GND)
Tape M. EQ. Spec.
---
Note:
J2002 (+B), TP1405 (GND), VR1601 --- Main CBA
1. Connect the unit to AC Power Outlet.
2. Connect DC Volt Meter to J2002 (+B) and TP1405
(GND).
3. Adjust VR1601 so that the voltage of J2002 (+B)
becomes +105±0.5V DC.
VR1601 --- -----
DC Voltmeter
Plastic Tip Driver
+105±0.5V DC
SCREW
Remote control unit (Bottom)
2. Cut off pin 10 of the remote control microprocessor
and short circuit pins 10 and 17 of the microprocessor with a jumper wire.
Fig. 1-1
1-6-1 T8059EA
2-1. Setting for Data Values
3-1. C-Trap Adjustment
General
1. Enter the Service mode. (See page 1-6-1.)
2. To select the Data Value, press "VOL p" button on
the service remote control unit.
3. To set the following data values, press "CH o / p"
buttons on the service remote control unit.
7F --- set to FF
9V --- set to OFF
2-2. Setting for CONTRAST,
COLOR, TINT and V-TINT
Data Values
General
1. Enter the Service mode. (See page 1-6-1.)
2. Press "PICTURE" button on the service remote con-
trol unit. Display changes "BRIGHT," "CONTRAST,"
"COLOR," "TINT," and "V-TINT" cyclically when "PICTURE" button is pressed.
CONTRAST (CNT)
1. Press "PICTURE" button on the service remote con-
trol unit. Then select "CONTRAST" (CNT) display.
2. Press "CH o / p" buttons on the service remote
control unit so that the value of "CONTRAST"
(CNT) becomes 76.
COLOR (CLR)
1. Press "PICTURE" button on the service remote
control unit. Then select "COLOR" (CLR) display.
2. Press "CH o / p" buttons on the service remote
control unit so that the value of "COLOR" (CLR)
becomes 58.
TINT (TNT)
1. Press "PICTURE" button on the service remote
control unit. Then select "TINT" (TNT) display.
2. Press "CH o / p" buttons on the service remote
control unit so that the value of "TINT" (TNT) becomes 57.
V-TINT (V-TNT)
1. Press "PICTURE" button on the service remote
control unit. Then select "V-TINT" (V-TNT) display.
2. Press "CH o / p" buttons on the service remote
control unit so that the value of "V-TINT" (V-TNT)
becomes 56.
Note: BRIGHT data value does not need to be adjust-
ed at this moment.
Purpose: To get minimum leakage of the color signal
carrier.
Symptom of Misadjustment: If C-Trap Adjustment is
incorrect, stripes will appear on the screen.
Test point Adj. Point Mode Input
TP1503
(B-OUT)
Tape M. EQ. Spec.
---
minimum
Note: TP1503 (B-OUT)--- Main CBA
1. Connect oscilloscope to TP1503.
2. Input a color bar signal from RF input.
Enter the Service mode. (See page 1-6-1.)
3. Press "0" button on the remote control unit and
select C-TRAP mode. (Fig. 3)
4. Press "CH o / p" buttons on the remote control
unit so that the carrier leakage B-Out (3.58MHz)
value becomes minimum on the oscilloscope.
5. Turn the power off and on again.
CH o / p
buttons
Oscilloscope
Pattern Generator
Figure
--- Color Bar
---
Fig. 2
1-6-2 T8059EA
3-2. Y DL Time TV/Y DL Time EXT/
Y SW LPF/Black Stretch Off/
Black Stretch CONT/C. Angle
Adjustment
Purpose: To get minimum leakage of the color signal
carrier.
Symptom of Misadjustment: If Y DL Time Adjust-
ment is incorrect, stripes will appear on the screen.
1. Enter the Service mode. (See page 1-6-1.)
2. Y DL Time TV Adjustment: Press "0" button on
the service remote control unit twice to show "D-T
TV" on the display.
Y DL Time EXT Adjustment: Press "0" button on
the service remote control unit three times to show
"D-T EXT" on the display.
Y SW LPF Adjustment: Press "0" button on the
service remote control unit four times to show "Y
SW" on the display.
Black Stretch Off Adjustment: Press "0" button
on the service remote control unit five times to
show "B-S" on the display.
Black Stretch CONT Adjustment: Press "0" button on the service remote control unit six times to
show "BS2" on the display.
C. Angle Adjustment: Press "0" button on the service remote control unit seven times to show "CANG" on the display.
3. Y DL Time TV Adjustment: Select "2" by pressing
"CH o / p" buttons on the service remote control.
Y DL Time EXT Adjustment: Select "2" by pressing "CH o / p" buttons on the service remote control.
Y SW LPF Adjustment: Select "0" by pressing
"CH o / p" buttons on the service remote control.
Black Stretch Off Adjustment: Select "OFF" by
pressing "CH o / p" buttons on the service remote
control.
Black Stretch CONT Adjustment: Select "0" by
pressing "CH o / p" buttons on the service remote
control.
C. Angle Adjustment: Select "103" by pressing
"CH o / p" buttons on the service remote control.
C-TRAP Adjustment (Factory mode)
"0"
button
C-TRP 0 C-TRP 1
"0" button
CH
button
CH
button
Y DL Time TV Adjustment
CH
D-T TV 0 D-T TV 1
"0" button
button
CH
button
Y DL Time EXT Adjustment
CH
D-T EXT 0 D-T EXT 1
"0" button
button
CH
button
Y SW LPF Adjustment
CH
Y SW
"0" button
button
0 Y SW
CH
button
Black Stretch Off Adjustment
CH
B-S OFF
"0" button
button
CH
button
Black Stretch CONT Adjustment
CH
BS2 0
button
CH
button
1
B-S 0
BS2 1
"0" button
C. Angle Adjustment
CH
C-ANG 103
button
CH
button
C-ANG 95
Fig. 3
1-6-3 T8059EA
4. V. Size Adjustment
6. H. Position Adjustment
Purpose: To obtain correct vertical height of screen
image.
Symptom of Misadjustment: If V. Size is incorrect,
vertical height of image on the screen may not be
properly displayed.
Test point Adj. Point Mode Input
---
Tape M. EQ. Spec.
--- Pattern Generator 90±5%
1. Enter the Service mode. (See page 1-6-1.)
Press "9" button on the remote control unit and
select V-S mode. (Press "9" button then display will
change to V-P and V-S).
2. Input monoscope pattern.
3. Press "CH o / p" buttons on the remote control
unit so that the monoscope pattern is 90±5% of display size and the circle is round.
CH o / p
buttons
--- Monoscope
5. V. Shift Adjustment
Purpose: To obtain correct vertical position of screen
image.
Symptom of misadjustment: If V. Position is incor-
rect, vertical position of image on the screen may not
be properly displayed.
Purpose: To obtain correct horizontal position of
screen image.
Symptom of Misadjustment: If H. Position is incorrect, horizontal position of image on the screen may
not be properly displayed.
Test Point Adj. Point Mode Input
CH o / p
---
Tape M. EQ. Spec.
--- Pattern Generator 90±5%
Note: Use service remote control unit
1. Operate the unit for at least 20 minutes.
2. Enter the Service mode. (See page 1-6-1.)
3. Input monoscope pattern.
4. Press "8" button on the remote control unit and select "H-P" mode.
5. Press "CH o / p" buttons on the service remote
control unit so that the monoscope pattern is
90±5% of display size and the circle is round.
6. Turn the power off and on again, using the main
power button on the TV unit.
buttons
[ H-P ] mode
RF
Mono-
scope
Test point Adj. Point Mode Input
Screen Control,
---
Tape M. EQ. Spec.
--- Pattern Generator 90±5%
Note: Use service remote control unit
1. Operate the unit for at least 20 minutes.
2. Enter the Service mode. (See page 1-6-1.)
3. Input 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 o / p" buttons on the service remote
control unit so that the top and bottom of the monoscope pattern are equal to each other.
6. Turn the power off and on again, using the main
power button on the TV unit.
CH o / p
buttons
RF Monoscope
1-6-4 T8059EA
Loading...