NEC Projector Px750u User Manual

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6. Installation and Connections
Example	of	wireless	LAN	connection
(Network	Type	→	Infrastructure)
(→	page	136)
PC with wireless LAN card 
inserted PC with built-in wireless LAN 
function
Wired LAN
Wireless access point
USB Wireless LAN Unit
To	
enable	 direct	communication	 (i.e.,	peer-to-peer)	 between	computers	 and	projectors,	 you	need	 to	select	 the	Ad	
Hoc	mode. 	(→	page	136)
PC with wireless LAN card 
inserted PC with built-in wireless LAN 
function
Example	of	wireless	LAN	connection	(Network	 Type	→	Ad	Hoc)
USB Wireless LAN Unit 
						

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6. Installation and Connections
Stacking projectors
The	projected	 image	brightness	 can	be	doubled	 by	gravity	 stacking	 up	to	two	 projectors	 without	external	 support.	This	
is	called	 “Stacking	Projection”.
 CAUTION:
A	minimum	 of	two	 persons	 are	required	 to	carry	 the	projector. 	Otherwise	 the	projector	 may	tumble	 or	drop,	 causing	
personal	injury.
NOTE:
•	 Projectors	with	different	model	numbers	cannot	be	gravity	stacked.
 Optional lenses with the same model numbers must be used for stacking pr\
ojection.
•	 For	stacking	projectors,	attach	the	supplied	three	stacking	holders	to	the	top	of	the	lower	projector.	(→ next page)
•	 The	 stacking	 projection	 does	not	support	 accuracy	 for	overlaying	 two	images	 perfectly	 so	that	 small	 text	and	detailed	 graphics	
can be clearly read or seen.
•	 Use	a	commercially	 available	distribution	 amplifier	to	both	 the	primary	 (upper)	and	the	secondary	 (lower)	projectors	 to	distribute	
signal to two outputs of the two projectors.
•	 Notes	for	stacking
-	 Ask	your	service	person	for	setting	up	and	adjusting	projectors.
-	 Set	 up	the	 projectors	 in	a	place	 or	structure	 in	a	way	 with	 sufficient	 strength	to	support	 the	combined	 weight	of	the	 two	 projec-
tors.	The	single	projector	with	a	lens	weighs	up	to	approximately	21	kg/	47	lbs.
-	 To	prevent	the	projectors	from	falling,	fasten	them	in	a	way	to	withstand	earthquakes.
-	 Double	stacking	will	cause	room	temperature	to	increase.	Ventilate	the	room	well.
-	 Do	not	attempt	to	stack	projectors	on	the	ceiling.	Gravity	stacking	cannot	be	done	on	the	ceiling.
-	 Warm	up	the	projectors	for	one	hour	before	the	desired	projection	is	obtained.
-	 Make	 sure	that	the	position	 of	the	 upper	 projector	 does	not	exceed	 its	specifications.	 When	setting	 up	the	 two	 projectors,	
adjustable height range for the tilt feet on the upper projector is adde\
d to the total adjustable range.
-	 Set	 up	the	 projectors	 so	that	 the	projected	 image	shows	 as	little	 geometric	 distortions	 as	possible.	 The	lens	 is	different	 in	
geometric	distortion	between	wide(+)	and	tele	(−)	for	zoom.
-	 Adjust	the	horizontal	lens	shift	to	the	lens	center.  s 
						

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6. Installation and Connections
Attaching	Stacking	Holders
Attach	three	stacking	holders	to	three	locations	on	the	top	of	the	lower	projector.
Preparation:
Tools	required	are	Phillips	screwdriver	(plus-head)	and	three	stacking	holders	packaged	with	the	projector.
Loosen	the	tilt	feet	(three	locations)	of	the	projector.
1.	 Remove	rubber	caps	and	screws	at	three	locations.
(1) Use your tweezers or nail to pinch and pull up the rubber cap.
(2) Remove the screw from a square hole.
(1) (2)
2.	 Attach	the	three	stacking	holders	at	three	locations.
(1) Place a stacking holder in a square hole.
(2) Use the screw removed at Step 1 to fix the stacking holder in the square hole.
(3) Put the rubber cap removed at Step 1 back into the square hole.
	 •	 Snap	the	tabs	on	both	of	the	rubber	cap	into	the	slits	on	both	sides	in	the	square	hole.
(1) (2)(3) 
						

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6. Installation and Connections
3.	 Put	another	projector	on	the	first	projector.
 Put each tilt foot of the upper projector on the stacking holders (three locations).
•	 Each	tilt	foot	has	a	rubber. 	Place	each	tilt	foot	rubber	on	stacking	holders	(three	locations).
Foot rubber
TIP:
•	 To	remove	the	stacking	holders,	perform	the	above	steps	in	reverse	order. 
						

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This	section	 describes	 the	simple	 maintenance	 procedures	you	should	 follow	to	clean	 the	filters,	 the	lens,	 the	cabinet, 	
and	to	replace	the	lamp	and	the	filters.
1 Cleaning the Filters
The	air-filter	 sponge	keeps	dust	and	dirt	from	 getting	 inside	the	projector	 and	should	 be	frequently	 cleaned.	If	 the	 filter	
is	dirty	or	clogged,	your	projector	may	overheat.
NOTE:	 The	message	 for	filter	 cleaning	 will	be	displayed	 for	one	 minute	 after	the	projector	 is	turned	 on	or	off.	 When	 the	message	 is	
displayed,	clean	the	filters.	The	time	to	clean	the	filters	is	set	to	[OFF]	at	time	of	shipment.	(→ page 115)
To cancel the message, press any button on the projector cabinet or the r\
emote control.
 CAUTION
•	 Before	 cleaning	the	filters,	 turn	off	the	 projector,	 disconnect	 the	power	 cord	and	then	 allow	 the	cabinet	 to	cool. 	
Failure	to	do	so	can	result	in	electric	shock	or	burn	injuries.
Preparation: 	Before	cleaning	the	filters,	use	a	vacuum	cleaner	to	clean	the	ventilations	(inlet).
There	are	two	filters	on	the	front	(front	filter)	and	left	side	(side	filter). 	
When	replacing	the	filters,	buy	the	optional	filter	NP02FT	in	advance.
Filter cover
Inlet
(The small filter is inside)
Filter cover
Inlet
(The large filter is inside.)
1.	 Push	the	positions	shown	(2	locations)	to	release	the	filter	cover	and	remove	it.
Filter cover
Buttons
2.	 Remove	the	two	filters	by	pulling	out.
Filter unit
7. Maintenance 
						

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7. Maintenance
3.	 Use	a	vacuum	cleaner	to	vacuum	all	the	dust	inside.
	 Get	rid	of	dust	in	the	accordion	filter
NOTE: 
•	 Whenever	you	vacuum	the	filter,	use	the	soft	brush	attachment	to	vacuum.	This	is	to	avoid	damage	to	the	filter.
•	 Do	not	wash	the	filter	with	water.	Doing	so	can	result	in	filter	clogging.
4.	 Put	the	filters	back	into	place
 The filter cannot be inserted from the outside.
	 Insert	the	filter	with	 “↓	AIR	FLOW	↓” facing the projector.
5.	 Put	the	filter	cover	back	to	the	projector	cabinet.
	 Insert	the	catches	 on	the	 top	and	 bottom	 of	the	 filter	 cover	 into	the	grooves	 in	the	 projector,	 then	press	 the	top	and	
bottom buttons to close.
•	 Push	the	filter	cover	until	it	clicks	into	place.
Buttons
Catches
6.	 Clear	the	filter	usage	hours:
  Plug the power cord into the wall outlet, turn on the main power switch, and then turn on the projector.
 From the menu, select [RESET] →	[CLEAR	FILTER	HOURS].and	reset	the	filter	usage	hours. 	(→ page 130) 
						

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7. Maintenance
 Cleaning the Lens
•	 Turn	off	the	projector	before	cleaning.
•	 Use	a	blower	or	lens	paper	to	clean	the	lens,	and	be	careful	not	to	scratch	or	mar	the	lens.	
 Cleaning the Cabinet
Turn	off	the	projector,	and	unplug	the	projector	before	cleaning.
•	 Use	a	dry	soft	cloth	to	wipe	dust	off	the	cabinet.
	 If	heavily	soiled,	use	a	mild	detergent.	
•	 Never	use	strong	detergents	or	solvents	such	as	alcohol	or	thinner. 	
•	 When	cleaning	the	ventilation	 slits	or	the	 speaker	 using	a	vacuum	 cleaner,	 do	not	 force	 the	brush	 of	the	 vacuum	
cleaner	into	the	slits	of	the	cabinet.
Vacuum the dust off the ventilation slits.
•	 Clogged	ventilation	slits	may	cause	a	rise	in	the	internal	temperature	of	the	projector,	resulting	in	malfunction.
•	 Do	not	scratch	or	hit	the	cabinet	with	your	fingers	or	any	hard	objects
•	 Contact	your	dealer	for	cleaning	the	inside	of	the	projector.
NOTE:	 Do	not	 apply	 volatile	 agent	such	as	insecticide	 on	the	 cabinet,	 the	lens,	 or	the	 screen.	 Do	not	 leave	 a	rubber	 or	vinyl	 product	
in	prolonged	contact	with	it.	Otherwise	the	surface	finish	will	be	deteriorated	or	the	coating	may	be	stripped	off.	 
						

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7. Maintenance
 Replacing the Lamp and the Filters
When	the	lamp	 reaches	 the	end	 of	its	 life,	 the	LAMP	 indicator	 in	the	 cabinet	 will	blink	 red	and	 the	message	 “THE	
LAMP	HAS	REACHED	 THE	END	 OF	ITS	 USABLE	 LIFE.	PLEASE	 REPLACE	 THE	LAMP	 AND	FILTER. 	USE	 THE	
SPECIFIED	 LAMP	FOR	SAFETY	 AND	PERFORMANCE.” 	will	 appear	 (*).	Even	 though	 the	lamp	 may	still	be	working,	
replace	 the	lamp	 to	maintain	 the	optimal	 projector	 performance. 	After	 replacing	 the	lamp,	 be	sure	 to	clear	 the	lamp	
hour	meter. 	(→	page	129)
 CAUTION
•	 DO	NOT	TOUCH	 THE	LAMP	 immediately	 after	it	has	 been	 used.	It	 will	 be	extremely	 hot.	Turn	 the	projector	
off	and	then	disconnect	the	power	cord. 	Allow	at	least	one	hour	for	the	lamp	to	cool	before	handling.
•	 Use	the	specified	lamp	for	safety	and	performance.
•	 DO	NOT	REMOVE	 ANY	SCREWS	 except	two	(2)	lamp	 cover	 screw	 and	three	 (3)	lamp	 housing	 screws.	You	 could	
receive	an	electric	shock.
•	 Do	not	break	the	glass	on	the	lamp	housing.
	 Keep	 finger	prints	off	the	 glass	 surface	 on	the	 lamp	 housing. 	Leaving	 finger	prints	on	the	 glass	 surface	 might	cause	
an	unwanted	shadow	and	poor	picture	quality.
•	 The	 projector	 will	turn	 off	and	 go	into	 standby	 mode	when	you	continue	 to	use	 the	projector	 for	another	 100	hours	
after	 the	lamp	 has	reached	 the	end	 of	its	 life. 	If	 this	 happens,	 be	sure	 to	replace	 the	lamp. 	If	 you	 continue	 to	use	
the	 lamp	 after	the	lamp	 reaches	 the	end	 of	its	 life,	 the	lamp	 bulb	may	shatter,	 and	pieces	 of	glass	 may	be	scattered	
in	the	 lamp	 case.	Do	 not	 touch	 them	as	the	 pieces	 of	glass	 may	cause	 injury.	If	 this	 happens,	 contact	your	NEC	
dealer	for	lamp	replacement.
*NOTE: This message will be displayed under the following conditions:
•	 for	one	minute	after	the	projector	has	been	powered	on
•	 when	the		(POWER)	button	on	the	projector	cabinet	or	the	POWER	OFF	button	on	the	remote	control	is	pressed
To turn off the message, press any button on the projector cabinet or the\
 remote control.
Optional	lamp	and	tools	needed	for	replacement:
•	 Phillips	screwdriver	(plus-head)
•	 Replacement	lamp: 	 
NP22LP
Flow of Replacing the Lamp and the Filters
The	following	procedure	is	an	example	for	replacing	both	lamps.
Step 1.	 Replace	the	lamp	
Step 2.	 Replace	the	filters	(→	page	177)
Step 3.	 Clear	the	lamp	usage	hours	and	the	filter	usage	hours	(→	page	129,  130) 
						

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7. Maintenance
To replace the lamp: 
1.	 Remove	the	lamp	cover.
(1)	Loosen	the	two	lamp	cover	screws.
	 •	The	lamp	cover	screw	is	not	removable.
(2)	Pull	the	lamp	cover	towards	you	and	remove	it.
2.	 Remove	the	lamp	housing.
(1)	Loosen	 the	three	 screws	 securing	 the	lamp	 housing	 until	the	phillips	 screwdriver	 goes	into	a	freewheeling	 condi-
tion.
	 •	 The	three	screws	are	not	removable.
	 •		There	 is	an	 interlock	 on	this	 case	 to	prevent	 the	risk	 of	electrical	 shock.	Do	 not	 attempt	 to	circumvent	 this	
interlock.
(2)	Remove	the	lamp	housing	by	holding	it.
 CAUTION:
Make	sure	that	the	lamp	housing	is	cool	enough	to	handle	before	removing	it.
Exhaust fan power con-
nector
Handle 
						

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7. Maintenance
3.	 Install	a	new	lamp	housing.
(1)	Insert	a	new	lamp	housing	until	the	lamp	housing	is	plugged	into	the	socket.	
(2)	Secure	it	in	place	with	the	three	screws.
	 •	Be	sure	to	tighten	the	screws.
NOTE:
•	 Be	sure	to	install	both	Lamp	1	and	Lamp	2.	The	projector	will	not	turn	on	unless	both	the	lamps	are	installed.
Alignment hole
Guide	pin
4.	 Reattach	the	lamp	cover.
(1)	Replace	the	lamp	cover.
(2)	Tighten	the	two	screws	to	secure	the	lamp	cover.
	 •	Be	sure	to	tighten	the	screws.
Guide	pipe
Guide	pin
FrameWire
This completes the lamp replacement.
Go on to the filter replacement.
NOTE:	
When	you	continue	 to	use	 the	projector	 for	another	 100	hours	 after	the	lamp	 has	reached	 the	end	 of	its	 life,	 both	 LAMP	 1	
and	LAMP	2	indicators	will	light	red	and	the	projector	cannot	turn	on	and	the	menu	is	not	displayed.
If	this	happens,	press	the	HELP	button	on	the	remote	control	for	10	seconds	to	reset	the	lamp	clock	back	to	zero.
When	the	lamp	 time	clock	 is	reset	 to	zero,	 the	LAMP	 indicator	 goes	out.	When	 only	one	lamp	 is	replaced,	 select	[RESET]	 from	the	
menu	to	reset	the	lamp	hour	used.	Do	not	press	the	HELP	button.