Panasonic LCD Projector PT-L780NTU PT-L750U Operating Instructions

							51
Advanced Operation
Projection lens replacement
By replacing the projection lens with a lens that is sold separately, you can
change the projection distance.
#Turn the projection lens
anticlockwise until it is in
position.
$While pressing the lens
release button, turn the
projection lens anticlockwise
again.
%Remove the projection lens.
NOTE:
BWhen replacing a projection lens, make sure that the power is off (the
Power indicator illuminates green).
BDo not touch the signal connection. If any dust or lint gets onto the signal
connection, the electrical contact may become poor.
BDo not touch the surface of the lens with your bare hands.
BStore the replaced projection lens away carefully to avoid subjecting it to
excessive vibration or shock.
%
$#
$
#
#Insert the other projection
lens (sold separately) as far
as it will go, while matching
the projection to the groove.
$Turn the projection lens
clockwise until a click is
heard. Signal connection
Projection
Groove
Removing the lens
Installing the lens  
						

							52
Projection distance for each projection lens 
(sold separately)
Projector position
ET-LE10 (for short-distance projection)
Screen size (4:3) Projection distance (L)
Diagonal
lengthHeight (SH)Width 
(SW)Wide 
(LW)Telephoto
(LT)
1.01 m(40˝) 0.61 m(2´) 0.81 m(2´8˝) 1.1 m(3´7˝) 1.3 m(4´3˝)
1.27 m(50˝) 0.76 m(2´6˝) 1.02 m(3´4˝) 1.3 m(4´3˝) 1.7 m(5´6˝)
1.52 m(60˝) 0.91 m(3´) 1.22 m(4´) 1.6 m(5´2˝) 2.0 m(6´6˝)
1.77 m(70˝) 1.07 m(3´6˝) 1.42 m(4´8˝) 1.9 m(6´2˝) 2.4 m(7´10˝)
2.03 m(80˝) 1.22 m(4´) 1.63 m(5´4˝) 2.2 m(7´2˝) 2.7 m(8´10˝)
2.28 m(90˝) 1.37 m(4´6˝) 1.83 m(6´) 2.4 m(7´10˝) 3.1 m(10´2˝)
2.54 m(100˝) 1.52 m(5´) 2.03 m(6´8˝) 2.7 m(8´10˝) 3.5 m(11´5˝)
3.81 m(150˝) 2.29 m(7´6˝) 3.05 m(10´) 4.0 m(13´1˝) 5.3 m(17´4˝)
5.08 m(200˝) 3.05 m(10´) 4.06 m(13´4˝) 5.4 m(17´8˝) 7.0 m(22´11˝)
6.35 m(250˝) 3.81 m(12´6˝) 5.08 m(16´8˝) 6.7 m(21´11˝) 8.8 m(28´10˝)
7.62 m(300˝) 4.57 m(15´) 6.10 m(20´) 8.1 m(26´6˝) 10.6 m(34´9˝)
L
L
SH
SW
25 mm
L: Projection distance
SH: Image height
SW: Image width Top edge of screen
Screen
Screen
Bottom edge of screen  
						

							53
Advanced Operation
ET-LE20 (for medium-distance projection)
Screen size (4:3) Projection distance (L)
Diagonal
lengthHeight (SH)Width 
(SW)Wide 
(LW)Telephoto
(LT)
1.01 m(40˝) 0.61 m(2´) 0.81 m(2´8˝) 2.1 m(6´10˝) 3.3 m(10´9˝)
1.27 m(50˝) 0.76 m(2´6˝) 1.02 m(3´4˝) 2.7 m(8´10˝) 4.2 m(13´9˝)
1.52 m(60˝) 0.91 m(3´) 1.22 m(4´) 3.2 m(10´5˝) 5.0 m(16´4˝)
1.77 m(70˝) 1.07 m(3´6˝) 1.42 m(4´8˝) 3.8 m(12´5˝) 5.9 m(19´4˝)
2.03 m(80˝) 1.22 m(4´) 1.63 m(5´4˝) 4.3 m(14´1˝) 6.8 m(22´3˝)
2.28 m(90˝) 1.37 m(4´6˝) 1.83 m(6´) 4.9 m(16´) 7.7 m(25´3˝)
2.54 m(100˝) 1.52 m(5´) 2.03 m(6´8˝) 5.4 m(17´8˝) 8.5 m(27´10˝)
3.81 m(150˝) 2.29 m(7´6˝) 3.05 m(10´) 8.2 m(26´10˝) 12.9 m(42´3˝)
5.08 m(200˝) 3.05 m(10´) 4.06 m(13´4˝) 11.0 m(36´10˝) 17.2 m(56´5˝)
6.35 m(250˝) 3.81 m(12´6˝) 5.08 m(16´8˝) 13.8 m(45´3˝) 21.6 m(70´10˝)
7.62 m(300˝) 4.57 m(15´) 6.10 m(20´) 16.5 m(54´1˝) 26.0 m(85´3˝)
ET-LE30 (for long-distance projection)
Screen size (4:3) Projection distance (L)
Diagonal
lengthHeight (SH)Width 
(SW)Wide 
(LW)Telephoto
(LT)
1.01 m(40˝) 0.61 m(2´) 0.81 m(2´8˝) 3.4 m(11´1˝)
4.2 m(13´9˝)4.6 m(15´1˝)
1.27 m(50˝) 0.76 m(2´6˝) 1.02 m(3´4˝) 5.8 m(19´)
1.52 m(60˝) 0.91 m(3´) 1.22 m(4´) 5.0 m(16´4˝) 6.9 m(22´7˝)
1.77 m(70˝) 1.07 m(3´6˝) 1.42 m(4´8˝) 5.8 m(19´) 8.1 m(26´6˝)
2.03 m(80˝) 1.22 m(4´) 1.63 m(5´4˝) 6.6 m(21´7˝) 9.2 m(30´2˝)
2.28 m(90˝) 1.37 m(4´6˝) 1.83 m(6´) 7.4 m(24´3˝) 10.4 m(34´1˝)
2.54 m(100˝) 1.52 m(5´) 2.03 m(6´8˝) 8.2 m(26´10˝) 11.5 m(37´8˝)
3.81 m(150˝) 2.29 m(7´6˝) 3.05 m(10´) 12.2 m(40´) 17.3 m(56´9˝)
5.08 m(200˝) 3.05 m(10´) 4.06 m(13´4˝) 16.3 m(53´5˝) 23.0 m(75´5˝)
6.35 m(250˝) 3.81 m(12´6˝) 5.08 m(16´8˝) 20.4 m(66´11˝) 28.7 m(94´1˝)
7.62 m(300˝) 4.57 m(15´) 6.10 m(20´) 24.4 m(80´) 34.5 m(113´2˝)  
						

							54
Setting-up dimensions which are not given in the table can be calculated
using the formulas below.
If the screen size (diagonal) is SD (m), then the following formula is used to
calculate the projection distance for the wide lens position (LW) and the
projection distance for the telephoto lens position (LT).
Model No. of projection lens Aspect ratioMethods of calculation of Projection distance (L)  Unit: mm
Zoom lens
ET-LE10
(1.3-1.7:1)4:3LW=0.027xSD/0.0254-0.0523
LT=0.0355xSD/0.0254-0.0509
16:9
LW=0.0294xSD/0.254-0.0523
LT
=0.0387xSD/0.0254-0.0509
ET-LE20
(2.6-4.2:1)4:3LW=0.0554xSD/0.0254-0.134
LT=0.0871xSD/0.0254-0.136
16:9
LW=0.0604xSD/0.0254-0.134
LT
=0.0949xSD/0.0254-0.136
ET-LE30
(4.0-5.6:1)4:3LW=0.0809xSD/0.0254+0.104
LT=0.1147xSD/0.0254+0.096
16:9
LW=0.0881xSD/0.0254+0.104
LT
=0.1250xSD/0.0254+0.096
$
#
Slot cover replacement
When connecting the projector to a personal computer using an optional
projector LAN card, replace the slot cover with the accessory projector LAN
card slot cover.
Removing the slot cover
Installing the slot cover
#Remove the hooks from the holes
of the projector.
$Lift up the slot cover to remove it.
#Insert one of the hooks of the slot
cover (for projector LAN card) into
the mounting hole in the projector.
$Insert the other hook of the slot
cover into the other mounting hole
in the projector.  
						

							55
Advanced Operation
Putting the power cord and 
remote control unit away
#Put the remote control unit
into the cable cover with the
buttons facing downward to
prevent them from being
pressed.
$Put the power cords and
other cords into the cable
cover.
%Put the Velcro through the
hole, and tape it to prevent
the cords from dropping out.
&Insert the hook 1 of the cable
cover into the mounting hole
in the projector.
'Push in the hook 2 until it
locks into place.
(Tighten the screw by turning it
clockwise.
#Loosen the screw by turning it
anticlockwise.
$Release the two hooks at the
top of the cable cover.
%Pull the cable cover to the
rear to remove it from the
projector.
Removing the cable cover Installing the cable cover
#
$
%
Hook1
Hook2
Velcro
Remote control unit
(Infrared emitter)

QU 
QU
#% ˛ $
˛ $ ˛ '
&( ˛ '
NOTE:
Do not lift up the projector by holding the cable, otherwise the cable
cover might come off.  
						

							56
Using the cable cover 
When installing the projector to the ceiling, the accessory cable cover \
can be
used to cover the terminals or cords after removing the cut-away parts.
'Tighten the screw by turning it
clockwise. 
$Work the cut-away parts back and
forth several times to break the
fixing tabs. Smooth off any jagged
edges if necessary.
#Use pliers or similar to break the
perforated sections of the cut-
away parts. 
% Pass the power cord through cut-
away part S, and pass the other
cables through cut-away part L,
and then insert the tabs of the
cable cover into the mounting
holes in the projector.
& Push hook 2 until it locks into
place.
Perforated sections
Hook2 Hook1
Fixing tabs Fixing tabs
Cut-away part SScrew
Cut-away 
part L
Refer to page  55 for details on
removing the cable cover.
NOTE:
Do not cover the air inlet ports when
using the cable cover as stated
above.
Do not place any heavy objects on
the cable cover to prevent it from
being removed.
Do not bend the cables greatly,
otherwise it will be difficult to attach
the cable cover.
Remove the cable cover when
cleaning or replacing the air filter.  
						

							57
Advanced Operation
Using the remote terminal
Using the remote terminal built into this projector, it is possible to operate the
projector from an external location from where infrared remote control signals
cannot be received, by using a remote control panel.
Pin assignment and control
Short pin 1 and pin 9 when controlling.
#Power ON/OFF
D-Sub 9-pin (female) 
external appearance
NOTE:
BThe POWER, RGB and VIDEO buttons on the remote control unit and
projector will not operate when pins 1 and 9 are shorted. RS-232C
commands will also be ignored. If the projector is connecting a personal
computer using an optional wireless card or LAN card, the “POWER” or
“SWITCH INPUT MODE” will not function. 
BDo not short pins. 1, 2, 3, 5, or 6 when pin 9 is open. If this is done, the
projector will ignore signals from the remote control unit.
Pin
#
$
%
&
'
(
)
*
+Signal Name
GND
POWER
INPUT SEL3
INPUT SEL1
INPUT SEL2
ENABLEDescription
Ground
Power ON
Input signal select3
NC
Input signal select1
Input signal select2
NC
NC
Enables remote terminal control
15
69
Pin No. Setting
Short Open
OFF (standby) ON $
-#
Lamp
Pin No. Setting
Open Open Short Short Short Open
Open Short Open Open Short Open
Open Open Short Open Open Short
RGB1 RGB2 RGB3 VIDEO S-VIDEO DVI %
-#
'
-#
(
-#
Input Signal
$Switching the input mode  
						

							58
Using the SERIAL connector
The serial connector which is on the side connector panel of the projector
conforms to the RS-232C interface specification, so that the projector can be
controlled by a personal computer which is connected to this connector.
Connection
NOTE:
BUse a proper communication
cable which is suitable for the
personal computer to connect the
serial connector and the personal
computer.
Pin layout and signal
names for SERIAL
connector
D-Sub9p (male)
Communication cable SERIAL(female)Computer
Basic format
The data sent from the computer to
the projector is transmitted in the
format shown below.
NOTE:
BThe projector can not receive the
command for 10 seconds after
the lamp is switched on. Wait 10
seconds before sending the
command.
BIf sending multiple commands,
check that a response has been
received from the projector for
one command before sending the
next command.
BWhen a command which does
not require parameters is sent,
the colon (:) is not required.
BIf an incorrect command is sent
from the personal computer, the
“ER401” command will be sent
from the projector to the personal
computer.
Communications settings
15
69
D-SUB 9-pin connector seen from
outsideSignal level RS-232C
Asynchronous Sync. method
Baud rate
Parity9600 bps
None
Character length 8 bits
Stop bit 1 bit
X parameter None
S parameter None
STX Command : Parameter ETX
Start byte
(02h)
3 bytes1 byte
1 byte–5 bytesEnd byte
(03h)
Pin
No.Signal
nameContents
#
NC
$
TXD Transmitted data
%
RXD Received data
&
NC
'
GND
(
DSR
)
CTSConnected internally
*
RTS
NC +  
						

							59
Advanced Operation
Control commands
The commands which the personal computer can use to control the projector
are shown in the following table.
CommandControl
ContentsRemarks
In standby mode, all commands other than
the PON command are ignored.
BThe PON command is ignored during
lamp ON control.
BIf a PON command is received while the
cooling fan is operating after the lamp
has switched off, the lamp is not turned
back on again straight away, in order to
protect the lamp. Power ON PON
Power OFF POF
Volume AVLParameter
000–063(Adjustment value 0–63)
Input signal
selection IISParameter
VID=VIDEO SVD=S-VIDEO
RG1=RGB1(YP
BPR1) RG2=RGB2(YPBPR2)
RG3=RGB3 DVI=DVI
NWP=NETWORK (PT-L780NTU only) 
SDC=SD CARD (PT-L780NTU only) 
Lamp ON
condition query Q$SParameter
0 = Standby
1 = Lamp ON control active
2 = Lamp ON
3 = Lamp OFF control active
Cable specifications
(When connected to a personal computer)
1
2
3
4
5
6
7
8
91
2
3
4
5
6
7
8
9
NC NC NC NC NC
NC
NC
NC
At the projectorAt the computer
(DTE specifications)  
						

							60
Indicators
There are two indicators on the control panel of the projector which giv\
e
information about the operating condition of the projector. These indica\
tors
illuminate or flash to warn you about problems that have occurred inside\
 the
projector, so if you notice that one of the indicators is on, turn off t\
he power
and check the table below for the cause of the problem.
Problem Indicatordisplay
Flashing (red)
(Lamp unit on)
The surrounding
temperature or the
temperature inside
the projector has
become unusually
high. Illuminated (red)
(Lamp unit on)
The temperature
inside the projector
has become
dangerously high, or
the temperature has
suddenly changed.
B The ventilation holes may be covered.
B The ambient temperature in the place of use may be too high.
B The air filter may be blocked.
B Uncover the ventilation holes.
B Set up the projector in a place where the temperature is
between 0  °C (32  °F) and 40  °C (104  °F) and the humidity is
between 20% and 80% (with no condensation). [If you set the
FAN CONTROL to  “HIGH ” (page  47), set up the projector in a
place where the temperature is between 0  °C (32  °F) and 35  °C
(95  °F) and the humidity is between 20% and 80% (with no
condensation).]
B Turn off the MAIN POWER switch by following the procedure
on page  31, and then clean the air filter (refer to page  64).
Possible
cause
Remedy The surrounding
temperature or the
temperature inside
the projector has
become dangerously
high, causing the
lamp unit to be
automatically shut
off.
Flashing (red)
(Lamp unit off)
TEMP indicator