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 locations.
(1) Place a stacking holder in a square hole.
(2) Use the scre w 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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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	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 	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 122)
To cancel the message, press any button on the projector cabinet or the r\
emote control.
 CAUTION
•	 Before	cleaning 	the 	filters , 	tur n 	off 	the 	projector , 	disconnect 	the 	po wer 	cord 	and 	then 	allo w 	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 sho wn (2 locations) to release the filter cover and remove it.
Filter cover
Buttons
2. Remove the two filters by pulling out.
Filter unit
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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.
	 Insert	the	catches 	on 	the 	top 	and 	bottom 	of 	the 	filter 	co ver 	into 	the 	g rooves 	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 po wer 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 138)
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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 	cleaner , 	do 	not 	f orce 	the 	br ush 	of 	the 	v acuum 	
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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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 	sure 	to 	clear 	the 	lamp 	hour 	meter .	
(→	page	137)
 CAUTION
•	 DO	NOT	T OUCH 	THE 	LAMP 	immediately 	after 	it 	has 	been 	used.	It 	will 	be 	e xtremely 	hot.	T urn 	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	REMO VE 	ANY 	SCREWS 	e xcept 	tw o 	(2) 	lamp 	co ver 	scre w 	and 	three 	(3) 	lamp 	housing 	scre ws.	Y ou 	could 	
receive	an	electric	shock.
•	 Do	not	break	the	glass	on	the	lamp	housing.
	 Keep	finger	pr ints 	off 	the 	glass 	surf ace 	on 	the 	lamp 	housing.	Lea ving 	finger 	pr ints 	on 	the 	glass 	surf ace 	might 	cause 	
an	unwanted	shadow	and	poor	picture	quality.
•	 The	projector	will 	tur n 	off 	and 	go 	into 	standb y 	mode 	when 	y ou 	contin ue 	to 	use 	the 	projector 	f or 	another 	100 	hours 	
after	the	lamp 	has 	reached 	the 	end 	of 	its 	lif e.	If 	this 	happens , 	be 	sure 	to 	replace 	the 	lamp .	If 	y ou 	contin ue 	to 	use 	
the	lamp	after 	the 	lamp 	reaches 	the 	end 	of 	its 	lif e, 	the 	lamp 	b ulb 	ma y 	shatter , 	and 	pieces 	of 	glass 	ma y 	be 	scattered 	
in	the	lamp 	case .	Do 	not 	touch 	them 	as 	the 	pieces 	of 	glass 	ma y 	cause 	injur y.	If 	this 	happens , 	contact 	y our 	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 filter s (→ page 185)
Step 3.	 Clear	the	lamp	usage	hours	and	the	filter	usage	hours	(→ page 137, 138)
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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 k.	Do 	not 	attempt 	to 	circumv ent 	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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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
Frame Wire
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.
 
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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	high-precision	parts.	Keep	out	dust	and	dirt	during	filter	replacement.
•	 Do	not	wash	the	filter	with	water.	Water	will	damage	the	filter	membrane.
•	 Attach	the	filter 	in 	the 	correct 	orientation. 	Failure 	to 	do 	so 	may 	cause 	dust 	and 	dirt 	to 	enter 	inside 	the 	projector , 	resulting 	in 	projec-
tor malfunction.
Filter cover
Inlet
(The small filter is inside)
Filter cover
Inlet
(The large filter is inside.)
To replace the filters:
1. Push the positions sho wn (2 locations) to release the filter cover and remove it.
Filter cover
Buttons
2. Remove the two filters by pulling out.
Filter unit
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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	FILTER	HOURS].and	reset	the	filter	usage	hours.	 (→ page 138)
7. Maintenance