NEC Projector Px750u User Manual

167
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...

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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...

169
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...

170
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. 

171
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...

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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...

173
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...

174
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...

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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...

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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...