NEC VT70 Series, VT80 Series, VT60 Series, NP610 Series, NP-M350X Series Service Manual Supplement
...
MODEL VT60 Series NP600 Series
VT70 Series NP610 Series
VT80 Series NP-M350X Series
VT90 Series NP-M420X Series
NP3150 Series NP-M350XS Series
NP3250 Series NP-P420X Series
VT700 Series
VT770 Series
NP905 Series
LCD Projector
SERVICE MANUAL SUPPLEMENT
Better Service
Better Reputation
Better Profit
Optical alignment jig (optical axis alignment/polarizer alignment)
SAFETY CAUTION:
Before servicing this chassis, it is important that the service
technician read and follow the “Safety Precautions” and
“Product Safety Notice” in this Service Manual.
WARNING:
SHOCK HAZARD - Use an isolation transformer when servicing.
NEC DISPLAY SOLUTIONS, LTD.
SAFETY PRECAUTIONS
2-1
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE
COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED SERVICE PERSONNEL.
This symbol warns the user that uninsulated voltage within th e u ni t
may have sufficient magnitude to cause electric shock. Therefore, it is
dangerous to make any kind of contact with any part inside of this unit.
This symbol aler ts th e u ser t hat i mportant literature conce rn in g t he
operation and maintenance of this unit has been included.
Therefore, it should be read carefully in order to avoid any problems.
ATTENTION
RISQUE D'ELECTROCUTION
NE PAS OUVRIR
MISE EN GARDE: A FI N DE REDUIRE LES RISQUES D' ELECTR OC UT IO N, NE
PAS DEPO SER LE C OUVE RCLE , IL N' Y A A UCU N E P I ECE
UTILISABLE A L'INTERIEUR DE CET APPAREIL. NE CONFIER
LES TRAVAUX D'ENTRETIEN QU'A UN PERSONNEL QUALIFIE.
Ce symbole a pour but de prévenir I' utilisateur de la présence d'
une tension dangereuse, non isolée se trouvant à l' intérieur de l'
appareil. Elle est d' une intensité sufsante pour constituer un risque
d' électrocution. Eviter le contact avec les pièces à l' intérieur de cet
appareil.
Ce symbole a pour but de prévenir l' utilisateur de la présence d'
importantes instructions concernant l' entretien et le fonctionnement de
cet appareil. Par conséquent, elles doivent être lues attentivement an
d' éviter des problèmes.
WARNING
HEATSINK MAY BE ENERGIZED.
TEST BEFORE TOUCHING.
Heat sink located on the power board, is electried.
mark is putted on the primary heat sink.
Pay attention to this area.
2-2
SAFETY PRECAUTIONS
During servicing carefully observe the following.
1. OBSERVE ALL PRECAUTIONS
Items and locations that require special care during
serv-icing, such as the cabinet, chassis, and parts are
labelled with individual safety instructions. Carefully
comply with these instructions and all precautions in
the instruction manual.
2. BE CAREFUL OF ELECTRIC SHOCK
The chassis carries an AC voltage. If you touch the
chassis while it is still alive, you will get a severe
shock. If you think the chassis is alive, use an isolating
transformer o r gloves, or pul l out t he plug before
replacing any parts.
3. USE SPECIFIED PARTS
The components hav e be en chosen for min imu m
ammability and for specic levels of resistance value
and with s tand v oltag e. Re p lacem e nt pa r ts mu st
ma tch these orig ina l sp ecifica tio ns. Parts whose
specifications are particularly vital to safe use and
maintenance of the set are marked on the circuit
diagrams and parts list.
Substitution of these parts can be dangerous for you
and the customer, so use only specied parts.
4. REMOUNT ALL PARTS AND RECONNECT ALL
WIRES AS ORIGINALLY INSTALLED
For safety, insula t i n g tape and tub e s are u s e d
throughout, but some lift-off parts on the printed wiring
board require special attention.
All wires are positioned away from high-temperature
and high-voltage parts, and, if removed for servicing,
they m u s t be retu n e d precise l y to thei r o r iginal
positions.
5. LAMP
Be very careful of the lamp because it generates high
heat while it is used at high voltage. When replacing
the bulb, make sure it is cool enough.
6. LENS
Do not l ook i n to th e len s dur i ng pr oject i on. This
important to avoid damage to the eyes.
7. SERVICING
At the time of repair or inspection services, use an
earth band (wrist band), without fail.
8. RUN A COMPLETE SAFETY CHECK AT THE
COMPLETION OF SERVICING
Aft e r com p l e tion of serv i c i ng, co n firm th a t a l l
screws, parts, and wiring, removed or disconnected
for servicing, have b een returned to their o riginal
positions. Also examine if the serviced sections and
peripheral areas have suffered from any deterioration
as a result of servicing. In addition, check insulation
between external metallic parts and blades of walloutlet plugs. This examina tion is indispensable in
conrming complete establishment of safety.
(Insulation check)
Pull out a plug from a wall outlet to disconnect the
connection cable. Then turn on the POWER switch.
Use a 500V megger (Note 2) and confirm that the
insulation resistance is 1MΩ or more between each
terminal of the plug and exposed external metal (Note
1). If the measured value is below the specied level,
then it is necessary to inspect and x the set.
(Note 1)
Exposed external metal....RGB input terminals, control
terminals, etc.
(Note 2)
If a 500V megger is not available for an unavoidable
reason, then use a circuit tester or the like for inspection.
Loading...