NEC Projector PX750U2 User Manual

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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...

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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.
6. Installation and Connections  

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This	section	descr ibes 	the 	simple 	maintenance 	procedures 	y ou 	should 	f ollow 	to 	clean 	the 	filters , 	the 	lens , 	the 	cabinet, 	
and	to	replace	the	lamp	and	the	filters.
❶ Cleaning the Filters
The	air-filter	sponge 	k eeps 	dust 	and 	dir t 	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...

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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 inser ted from the outside.
	 Insert	the	filter	with	“↓	AIR	FLOW	↓” facing the projector.
5. Put the filter cover back to the projector cabinet....

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❷ 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.	
❸ 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 	v entilation 	slits 	or 	the 	speak er 	using 	a 	v acuum...

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❹ Replacing the Lamp and the Filters
When	the	lamp 	reaches 	the 	end 	of 	its 	lif e, 	the 	LAMP 	indicator 	in 	the 	cabinet 	will 	b link 	red 	and 	the 	message 	“THE 	LAMP 	
HAS	REACHED	THE 	END 	OF 	ITS 	USABLE 	LIFE.	PLEASE 	REPLA CE 	THE 	LAMP 	1 	(OR 	2).	USE 	THE 	SPECIFIED 	
LAMP	FOR	SAFETY 	AND 	PERFORMANCE. ”	will 	appear 	(*).	Ev en 	though 	the 	lamp 	ma y 	still 	be 	w orking, 	replace 	the 	
lamp	to	maintain 	the 	optimal 	projector 	perf ormance.	After 	replacing 	the 	lamp , 	be...

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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 	scre ws 	secur ing 	the 	lamp 	housing 	until 	the 	phillips 	scre wdriver 	goes 	into 	a 	free wheeling 	condi-
tion.
	 •	The 	 three 	 screws 	 are 	 not 	 removable.
	 •		There	is 	an 	inter lock 	on 	this 	case 	to 	pre vent 	the 	r isk 	of 	electr ical 	shoc...

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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...

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❺ Replacing the Filters
There	are	two	filters,	one	located	at	the	front	of	the	projector	and	one	on	the	side.
Optional	filters	(two	filter)	are	available.
Small	one	for	the	front
Large	one	for	the	left	side
NOTE:
•	 Replace	both	filters	with	the	new	ones	at	the	same	time.
•	 Before	replacing	the 	filters, 	use 	a 	vacuum 	cleaner 	to 	vacuum 	dust 	and 	dirt 	from 	the 	vents 	(inlet) 	of 	the 	projector 	and 	use 	a 	dr y 	
soft cloth to wipe dust off the cabinet.
•	 The	projector	contains...

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3. Insert new filters.
4. Put the filter cover back in.
Buttons
Catches
This completes the filter replacement.
Go on to the clearing lamp and filter hour meters.
To clear the lamp usage hours and the filter usage hours:
1. Place the pr ojector where you use it.
2. Plug the power cord into the wall outlet, and then turn on the projector.
3.	 Clear	the	lamp	usage	hours	and	the	filter	usage	hours.
1. From the menu, select [RESET] → [CLEAR LAMP HOURS] and reset the lamp usage hours.
2.	 Select	[CLEAR...