NEC PX-50XM4, Service Manual

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Check item Check column
Safety inspection before
repairing
Installation
conditions
Is there any influence by high temperatures (due to direct sunlight, etc.), moisture (steam, etc.), oil
fume, dust, and dew condensation?
Is the condition of ventilation acceptable (distance to the wall, ventilation holes, etc.)?
Is the condition of the antenna acceptable (reach to the wire, bend, tilt, etc.)?
Is the condition of power supply acceptable (regular outlet, adequate earthing, concentrated wiring, etc.)?
Is the condition of installation acceptable (unstability, height, tilt, falling preventive materials, etc.)?
Are the power plug and the power cord free from damage or the attachment of dust?
Is the product free from unusual sound, unusual odor, or unusually high temperature?
Are the knobs, handles, and back cabinet free from abnormality (rattling, drop off, etc)?
Is equipment free from any abnormality in daily use?
Is the symptom examined according to the user’s statement?
Is the product disassembled to the grade where troubleshooting is possible?
Is the symptom reproduced, the faulty part located as a result of fault diagnosis, and replaced?
Is the normal condition confirmed after aging?
Is the part, specified in the list of parts, used for the power unit?
Is the part, specified in the list of parts, used for the insulation material (material, thickness, etc)?
Is the part, specified in the list of parts, used for the power plug and the power cord?
Is the part, specified in the list of parts, used for the internal cabling and the high voltage lead wires?
Is the part, specified in the list of parts, used for the PDP module?
Are the rest of replaced parts those specified in the list of parts?
Is the part version correct?
Are the part mounting position, fixing method, and the distance the same as those of original?
Is the wiring layout the same as the original (connector, clamper, distance from a heat generating part, etc)?
Is the soldering condition acceptable (whisker, too much solder, tunnel, failure in winding, etc)?
Is the insulation material the same as the original (tubes, tapes, fiber, etc.)?
Product
main body
Authentic repair
T
rouble-
shooting
Specified parts
Wires
mounted
Are the repaired section and its peripheral parts free from abnormality?
Is there any intrusion of foreign substances (solder chips, wire chips, screw chips, screws, etc.)?
Is everything free from danger due to deterioration (discoloration, damage, leakage, etc.)?
Is the safety protection circuit in normal operation?
Are contamination and dust removed after final finish?
Is there any failure in mounting and tightening (back cabinet, falling preventive materials, etc.)?
Is there any influence by high temperatures (direct sunlight, stove, etc.), moisture (steam, etc.), oil fume,
dust, and dew condensation?
Is the condition of ventilation acceptable (distance to the wall, ventilation holes, etc.)?
Is the condition of the antenna acceptable (reach to the wire, bend, tilt, etc.)?
Is the condition of power supply acceptable (regular outlet, adequate earthing, concentrated wiring, etc.)?
Is the condition of installation acceptable (unstability, height, tilt, falling preventive materials, etc.)?
Is the insulation check finished with a circuit tester or the like? (Refer to the above description, “Method of
insulation check.”)
Are the contents and actual treatment of repairing and safety inspection services duly explained?
To use equipment after reading through the instruction manual.
Not to dislodge the back cabinet.
Not to insert anything in ventilation holes and clearances.
To pull out the power plug if the product is not used for a long time.
To ask an NEC’s authorized maintenance service company for the cleaning of the product interior
for the removal of dust.
To turn off the power switch when cleaning the panel surface and the cabinet.
To turn off the power switch of the main unit for the product provided with a remote control, in case
of going out or sleeping.
Are explanations given to pull out the power plug in case of abnormality and to contact the dealer or an
NEC’s authorized maintenance service company.
Safety inspection after repairing
Explanation to the user
Explanation of use
• For the maintenance servicing, safety inspection is needed in accordance with the check list.
• Inspection should be carried out according to the check list shown below, in regard to
safety inspection before and after repairing, authentic repair, and explanation to the
user.
(Method of insulation check)
Mount a PDP module on the product to complete it. After the completion of aging and
others, pull out the power plug from the wall outlet, remove the cable, and turn on the
power switch. Use a 500V megger (Note 1) and confirm that the insulation resistance is
50M
.
or more between each terminal (except for the 3-core earth terminal) of the power
plug (Note 2) and the external exposed metallic parts (Note 3). If the insulation
resistance is found to be below the specified value, recover the faulty section and make
another insulation check again.
(Note 1) If a 500V megger is not available at that time, use a circuit tester or the like.
(Note 2) In the case of a 3-core terminal, the earth resistance shall be 1 Ω or less
between the earth terminal and the earth side of each input terminal.
(Note 3) Head phone jack, speaker terminals, remote control terminals, each I/O
terminals, control terminals, screws, etc.
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