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SERVICE MANUAL
A315MDY6-A01
21A9MDY5BA01
2109MDY5DA01
21B8MDY5AA01
I. Safety Instructions ...................................................................................................................... 2
II. Specifications ........................................................................................................................... 4
III. Level List of Equipments & Instruments Required for Production ............................................... 6
IV.Wiring Diagram........................................................................................................................ 7
V. Block Diagram ......................................................................................................................... 8
VI.Disassembly ............................................................................................................................ 9
VII. Input Signals & Equipments List for Alignment ......................................................................... 9
VIII. EEPROM Setting ................................................................................................................. 10
IX. Electrical Adjustment ............................................................................................................ 17
X. Transistor and IC Identification ................................................................................................ 18
XI. Schematic Diagram .............................................................................................................. 19
XII. Component Diagrams .......................................................................................................... 20
XIII. Exploded View Diagram ...................................................................................................... 25
This manual is the latest at the time of printing, and does not include the modification which
may be made after the printing, by the constant improvement of product.
I. Safety Instructions
The lightning flash with arrowhead symbol,
within an equilateral triangle, is intended to alert
CAUTION the user to the presence of uninsulated "dangerous
voltage" within the product's enclosure that may
RISK OF ELECTRIC SHOCK be of sufficient magnitude to constitute a risk of
DO NOT OPEN electric shock to persons.
The exclamation point within an equilateral
CAUTION: TO REDUCE THE RISK OF ELECTRIC triangle is intended to alert the user to the
SHOCK, DO NOT REMOVE COVER (OR BACK). NO
presence of important operating and maintenance
USER-SERVICEABLE PARTS INSIDE. REFER
( s e r vi c i n g ) i n s t r u c t i o n s i n t h e l i t e r a t u r e
SERVICING TO QUALIFIED SERVICE PERSONNEL accompanying the appliance.
ONLY.
PRECAUTIONS DURING SERVICING WARNING:
1. In addition to safety, other parts and assemblies are
specified for conformance with such regulations as Before servicing this TV receiver, read the X-RAY
those applying to spurious radiation. These must RADIATION PRECAUTION, SAFETY INSTRUCTION
also be replaced only with specified replacements. and PRODUCT SAFETY NOTICE.
Examples: RF converters, tuner units, antenna
selection switches, RF cables, noise-blocking X-RAY RADIATION PRECAUTION
capacitors, noise-blocking filters, etc. 1. Excessively high can produce potentially hazardous
2. Use specified internal W iring. Note especially: X-RAY RADIATION. To avoid such hazards, the high
1) W ires covered with PVC tubing voltage must not exceed the specified limit. The
2) Double insulated wires normal value of the high voltage of this TV receiver
3) High voltage leads is 27 KV at zero bean current (minimum brightness).
3. Use specified insulating materials for hazardous The high voltage must not exceed 30 KV under any
live parts. Note especially: circumstances. Each time when a receiver requires
1) Insulating Tape servicing, the high voltage should be checked. The
2) PVC tubing reading of the high voltage is recommended to be
3) Spacers (insulating barriers) recorded as a part of the service record, It is
4) Insulating sheets for transistors important to use an accurate and reliable high
5) Plastic screws for fixing micro switches voltage meter.
4. W hen replacing AC primary side components 2. The only source of X-RAY RADIATION in this TV
(transformers, power cords, noise blocking receiver is the picture tube. For continued X-RAY
capacitors, etc.), wrap ends of wires securely about RADIATION protection, the replacement tube must be
the terminals before soldering. exactly the same type as specified in the parts list.
3. Some parts in this TV receiver have special safety
related characteristics for X-RADIATION protection.
For continued safety, the parts replacement should
be under taken only after referring the PRODUCT
5. Make sure that wires do not contact heat generating SAFETY NOTICE.
parts (heat sinks, oxide metal film resistors, fusible
resistors, etc.) SAFETY INSTRUCTION
6. Check if replaced wires do not contact sharply edged The service should not be attempted by anyone
or pointed parts. unfamiliar with the necessary instructions on this TV
7. Make sure that foreign objects (screws, solder receiver. The following are the necessary instructions
droplets, etc.) do not remain inside the set. to be observed before servicing.
1. An isolation transformer should be connected in the
MAKE YOUR CONTRIBUTION TO PROTECT THE power line between the receiver and the AC line
ENVIRONMENT when a service is performed on the primary of the
Used batteries with the ISO symbol converter transformer of the set.
for recycling as well as small 2. Comply with all caution and safety related provided
accumulators (rechargeable batteries), mini-batteries on the back of the cabinet, inside the cabinet, on the
(cells) and starter batteries should not be thrown chassis or picture tube.
into the garbage can.
Please leave them at an appropriate depot.
-2-
3. To avoid a shock hazard, always discharge the PRODUCT SAFETY NOTICE
picture tube's anode to the chassis ground before
removing the anode cap. Many electrical and mechanical parts in this TV
4. Completely discharge the high potential voltage of the receiver have special safety-related characteristics.
picture tube before handling. The picture tube is a These characteristics are offer passed unnoticed by
vacuum and if broken, the glass will explode. visual spection and the protection afforded by them
5. W hen replacing a MAIN PCB in the cabinet, always cannot necessarily be obtained by using replacement
be certain that all protective are installed properly components rates for a higher voltage, wattage, etc.
such as control knobs, adjustment covers or shields, The replacement parts which have these special
barriers, isolation resistor networks etc. safety characteristics are identified by marks on
6. W hen servicing is required, observe the original lead the schematic diagram and on the parts list.
dressing. Extra precaution should be given to assure Before replacing any of these components, read the
correct lead dressing in the high voltage area. parts list in this manual carefully. The use of
7. Keep wires away from high voltage or high tempera substitute replacement parts which do not have the
ture components. same safety characteristics as specified in the parts
8. Before returning the set to the customer, always list may create shock, fire, X-RAY RADIATION or
perform an AC leakage current check on the exposed other hazards.
metallic parts of the cabinet, such as antennas,
terminals, screwheads, metal overlay, control shafts,
etc., to be sure the set is safe to operate without
danger of electrical shock. Plug the AC line cord
directly to the AC outlet (do not use a line isolation
transformer during this check). Use an AC voltmeter
having 5K ohms volt sensitivity or more in the
following manner.
Connect a 1.5K ohm 10 watt resistor paralleled by a
0.15