Panasonic LCD Projector PT-LB51NTU PT-LB51U PT-LB51SU Operating Instructions

							Preparation
About Your Projector
ENGLISH - 11
Attaching a hand strap
You can attach a favorite strap on to the Remote control.
NOTE:
• Do not drop the Remote control.
• Avoid contact with liquids or moisture.
• Use manganese batteries or alkaline batteries with the Remote control.
• Do not attempt to modify or disassemble the Remote control. Contact an Authorised Service Center for repairs.
• Do not keep pressing the Remote control buttons as this may shorten battery life.
• See “Remote control operation” on page 23. 
						

							Preparation
About Your Projector
ENGLISH - 12
JTop and front view
Projector body
NOTE:
• Do not cover the ventilation openings or place anything within 15 cm (6) of them as this may cause damage or injury.
MENU button (page 27)
Display the MAIN MENU.  POWER button (page 20)
POWER indicator (page 20)
Switch between stand-by mode 
and projection mode.
Navigation buttons (page 27)
Navigate through the menus with 
FGIH, and activate the menu 
item with ENTER.FUNCTION button (page 34) INPUT SELECT button (page 22)
Switch to cycle through the input 
method.
Focus ring (page 22)
JControl panel
Zoom ring (page 22)
Font leg adjuster 
(L) button (page 17)
These buttons are 
used to unlock the 
front adjustable legs. 
Press to adjust
the angle of tilt of the 
projector.Control panel 
Security lock
This can be used to connect a commercially-available 
theft-prevention cable (manufactured by Kensington). 
This security lock is compatible with the Microsaver 
Security System from Kensington. 
Luminance Sensor 
(page 31)
This sensor detects the luminance 
when the “DAYLIGHT VIEW” 
function is operating. Do not cover 
the projector and do not place any 
object on the projector when 
using it.TEMP indicator (page 39) COMPUTER INPUT indicator 
This indicator illuminates when a 
signal is being input to the 
connector (COMPUTER1 IN or 
COMPUTER 2 IN) selected using 
the INPUT SELECT buttons.
LAMP indicator (page 39)
Projection lens Remote control signal 
receptor (page 23)
Font leg adjuster (R) button
(page 17) 
						

							Preparation
About Your Projector
ENGLISH - 13
JBack and bottom view
NOTE:
• Do not cover the ventilation openings or place anything within 15 cm (6) of them as this may cause damage or injury.
• When a cable is connected to the VARIABLE AUDIO OUT, the built-in speaker will be disabled.
AC IN
Connect the Power cord 
to supply electronic power 
to the projector. (page 20) Font adjustable legs (L/R)
Adjust the projection angle. 
(page 17)
COMPUTER1 IN
Connect an RGB signal 
cable from a computer.S-VIDEO IN
Connect a S-VIDEO signal 
cable.
VIDEO IN
Connect an RCA composite 
video cable.
COMPUTER AUDIO IN
Connect audio cables for 
inputting audio signals 
corresponding to 
COMPUTER1 IN and 
COMPUTER2 IN/1 OUT. SERIAL
See “Serial terminal” 
on page 45.Air exhaust port
VARIABLE AUDIO OUT
Connect an audio cables 
for outputting audio 
signals to the connected 
equipment.
JConnector Panel
Air exhaust port
Speaker
COMPUTER2 IN/1 OUT
Connect an RGB signal cable from 
a computer. 
Selectable for input 
and output by menu operation.
Connector Panel
AUDIO IN
Connect audio cables for 
inputting audio signal 
corresponding to VIDEO IN, 
S-VIDEO IN and 
COMPONENT IN. Air intake port, Air filter
(page 40) Lamp unit compartment
(page 41) 
						

							Getting Started
ENGLISH - 14
Setting up
You can adjust the projection size with 1.2x zoom lens. Calculate and define the throw distance as follows.
PT-LB51NTU/PT-LB51U
PT-LB51SU
* All measurements above are approximate and may differ slightly from the actual measurements.
Screen size and throw distance
Projection size (4 : 3)Throw distance (L)Height
position
(H1)
Screen 
diagonal (SD)Screen height 
(SH)Screen width 
(SW)Minimum 
distance (LW)Maximum 
distance (LT)
33 (0.84 m) 0.50 m (17) 0.67 m (22) 1.1 m (37) 0.07 m (2-3/4”)
40 (1.02 m) 0.61 m (2) 0.81 m (27) 1.2 m (311) 1.4 m (47) 0.08 m (3-1/8”)
50 (1.27 m) 0.76 m (25) 1.02 m (34) 1.6 m (52) 1.8 m (510) 0.11 m (4-5/16”)
60 (1.52 m) 0.91 m (211) 1.22 m (4) 1.9 m (62) 2.1 m (610) 0.13 m (5-3/32”)
70 (1.78 m) 1.07 m (306) 1.42 m (47) 2.2 m (72) 2.5 m (82) 0.15 m (5-7/8”)
80 (2.03 m) 1.22 m (4) 1.63 m (54) 2.5 m (82) 2.9 m (96) 0.17 m (6-11/16”)
90 (2.29 m) 1.37 m (45) 1.83 m (6) 2.8 m (92) 3.3 m (109) 0.19 m (7-15/32”)
100 (2.54 m) 1.52 m (411) 2.03 m (67) 3.1 m (102) 3.6 m (119) 0.21 m (8-1/4”)
120 (3.05 m) 1.83 m (6) 2.44 m (8) 3.7 m (121) 4.4 m (145) 0.25 m (9-13/16”)
150 (3.81 m) 2.29 m (76) 3.05 m (10) 4.6 m (151) 5.5 m (18) 0.32 m (12-19/32”)
200 (5.08 m) 3.05 m (10) 4.06 m (133) 6.2 m (204) 7.3 m (2311) 0.42 m (16-17/32”)
250 (6.35 m) 3.81 m (126) 5.08 m (168) 7.7 m (253) 9.2 m (302) 0.53 m (20-27/32”)
300 (7.62 m) 4.57 m (1411) 6.10 m (20) 9.2 m (302) 11.1 m (365) 0.64 m (25-3/16”)
Projection size (4 : 3)Throw distance (L)Height
position
(H1)
Screen 
diagonal (SD)Screen height 
(SH)Screen width 
(SW)Minimum 
distance (LW)Maximum 
distance (LT)
33 (0.84 m) 0.50 m (17) 0.67 m (22) 1.1 m (37) 0.07 m (2-3/4”)
40 (1.02 m) 0.61 m (2) 0.81 m (27) 1.2 m (311) 1.4 m (47) 0.09 m (3-17/32”)
50 (1.27 m) 0.76 m (25) 1.02 m (34) 1.5 m (411) 1.8 m (510) 0.11 m (4-5/16”)
60 (1.52 m) 0.91 m (211) 1.22 m (4) 1.8 m (510) 2.1 m (610) 0.13 m (5-3/32”)
70 (1.78 m) 1.07 m (306) 1.42 m (47) 2.1 m (610) 2.5 m (82) 0.15 m (5-7/8”)
80 (2.03 m) 1.22 m (4) 1.63 m (54) 2.5 m (82) 2.9 m (96) 0.17 m (6-11/16”)
90 (2.29 m) 1.37 m (45) 1.83 m (6) 2.8 m (92) 3.2 m (105) 0.20 m (7-27/32”)
100 (2.54 m) 1.52 m (411) 2.03 m (67) 3.1 m (102) 3.6 m (119) 0.22 m (8-21/32”)
120 (3.05 m) 1.83 m (6) 2.44 m (8) 3.7 m (121) 4.3 m (141) 0.26 m (10-7/32”)
150 (3.81 m) 2.29 m (76) 3.05 m (10) 4.6 m (151) 5.4 m (178) 0.33 m (12-31/32”)
200 (5.08 m) 3.05 m (10) 4.06 m (133) 6.1 m (20) 7.3 m (2311) 0.43 m (16-29/32”)
250 (6.35 m) 3.81 m (126) 5.08 m (168) 7.6 m (2411) 9.1 m (2910) 0.54 m (21-1/4”)
300 (7.62 m) 4.57 m (1411) 6.10 m (20) 9.1 m (2910) 10.9 m (359) 0.65 m (25-9/16”)
SD
SW
SH1 HL (LW/LT)
L (LW/LT)
H S
W S
m m   2 . 1 8Screen
Projected image 
						

							Getting Started
Setting up
ENGLISH - 15
JCalculation methods for screen dimensions
You can calculate more detailed screen dimension from the screen diagonal. (Unit: m)
PT-LB51NTU/PT-LB51U
PT-LB51SU
* The results above are approximate and may differ slightly from the actual measurements. Projection size(4:3) Projection size(16:9)
SH = SD X 0.0152 SH = SD X 0.0125
SW = SD X 0.0203 SW = SD X 0.0221
LW = 0.0307 X SD - 0.031 LW = 0.0335 X SD - 0.0315
LT = 0.0371 X SD - 0.029 LT = 0.0405 X SD - 0.0365
 Projection size(4:3) Projection size(16:9)
SH = SD X 0.0152 SH = SD X 0.0125
SW = SD X 0.0203 SW = SD X 0.0221
LW = 0.0304 X SD - 0.029 LW = 0.0332 X SD - 0.032
LT = 0.0368 X SD - 0.041 LT = 0.0401 X SD - 0.038
NOTE:
• Do not use the projector at a raised or a horizontally tilted position as it may cause 
malfunction of the projector.
• Make sure the projector lens surface is parallel with the screen. You can tilt the projector 
body approximately ± 30° vertically. Overtilting may result in shortening the component’s 
life.
• For the best quality of the projection image, install a screen where sun light or room light 
does not shine directly onto the screen. Close window shades or curtains to block the lights. 
						

							Getting Started
Setting up
ENGLISH - 16
You can use the projector with any of the following 4 projection methods. To set the desired method in the projector, 
See “INSTALLATION” on page 35..
Projection method
JSetting on a desk/floor and 
projecting from front JSetting on a desk/floor and 
projecting from rear
INSTALLATION: FRONT/DESKINSTALLATION: REAR/DESK
JMounting in the ceiling and 
projecting from frontJMounting in the ceiling and 
projecting from rear
INSTALLATION: FRONT/CEILINGINSTALLATION: REAR/CEILING
NOTE:
• A translucent screen is required for rear projection.
• When mounting the projector in the ceiling, the optional ceiling mount bracket (ET-PKB50) is required. 
						

							Getting Started
Setting up
ENGLISH - 17
You can adjust the projection angle in the vertical direction by pressing the Font leg adjuster buttons.
See “Positioning the image” on page 22.
Front adjustable legs and throwing angle
NOTE:
• Heated air comes out of the Air exhaust port. Be careful of this when adjusting the Font adjustable legs.
• If keystone distortion occurs, see “KEYSTONE” on page 32. 
						

							Getting Started
ENGLISH - 18
Connections
 Read and follow the operating and connecting instructions of each peripheral device.
 The peripheral devices must be turned off.
 Use cables that match each peripheral device to be connected.
 If the input signal is affected by signal jitter, the projected image may have poor image quality and timebase 
correction is effective.
 Confirm the type of video signals. See “List of compatible signals” on page 44.
 Only one audio system circuit is available for each of the COMPUTER AUDIO IN and AUDIO IN L-R 
connectors, so if you change the audio input source, you will need to remove and insert the appropriate 
plugs.
 If the signal cables are disconnected or if the power supply for the computer or video deck is turned off while 
“DIGITAL ZOOM” or “INDEX-WINDOW” is being used, these functions will be canceled. 
See “Enlarging the centered area” on page 26.
See “Projecting an image in INDEX-WINDOW mode” on page 25.
Before connection to the projector
Connecting with computers
NOTE:
• When COMPUTER2 SELECT in the OPTION menu is set to OUTPUT, do not connect any input signals.
• Refer to the accessory CD-ROM for details on the wireless network that can be used for controlling the projector with a 
personal computer. (PT-LB51NTU only)
Computers
DIN 8-pin
(male) Computer for 
controlling
RGB signal cable 
(Commercial)
RGB signal cable 
(Commercial)
Computers Serial adapter
(ET-ADSER :
sold separately)
MonitorAudio system 
						

							Getting Started
Connections
ENGLISH - 19
JConnecting with VIDEO IN/S-VIDEO IN
JConnecting with COMPONENT IN
Connecting with AV equipment
NOTE:
• If you connect the BNC cables, use with a commercial BNC-RCA adaptor.
DVD player
Audio system To S-VIDEO output
Video player To video output or 
audio output
DVD player
(with component video 
connectors) D-sub15-pin (male) - BNCx5 (male) adapter cable
Red (connect to P
R signal connector)
Blue (connect to P
B signal connector)
Green (connect to Y signal connector)
Audio systemTo audio output BNC/RCA adapter 
						

							ENGLISH - 20
Basic Operation
Switching the projector on/off
JConnecting
1. Make sure the shape of the power cord plug and the AC IN connector on the back 
of the projector match, then push the plug all the way in.
2. Connect the Power cord to a wall outlet.
JDisconnecting
1. Check that the POWER indicator of the POWER button is lit red, and then unplug the Power cord from the 
wall outlet.
2. Hold the plug and unplug the Power cord from the AC IN connector on the back of the projector.
JDirect power off function
You can disconnect the Power cord during projection or immediately after use and move the projector. The 
cooling fan will operate by the internal power supply to cool down the lamp.
 When this function is used, it may take more time for the lamp to turn back on again compared to when the lamp cools 
down with the Power cord connected.
 Do not put the projector in a bag while the POWER button on the projector is illuminated.
JDirect power on function
If you activate the DIRECT POWER ON, you can start the projection only with connecting the Power cord. 
See “DIRECT POWER ON” on page 35.
Power cord
NOTE:
• Do not use other than a provided Power cord.
• Ensure all the input devices are connected and turned off before connecting the Power cord.
• Do not force the connector as this may damage the projector and/or the Power cord.
• Dirt or dust build-up around plugs may cause fire or electrical hazards.
• Switch off the power to the projector when not in use.
POWER indicator
Indicator statusStatus
RED LitThe projector is in standby.
When the LAMP or TEMP indicator is flashing, the POWER indicator will 
not be lit.
GREENFlashingThe POWER is switched on and the projector is getting ready to project.
LitThe projector is ready to project.
ORANGELitThe POWER is switched off and the projector is cooling the lamp.
FlashingThe POWER is switched on again when cooling the lamp and recovering 
to projection mode. Recovery may take a while.
NOTE:
• If the projector is switched on again while the internal cooling fan is still operating by the internal power supply, it may take 
a while to start the projection.
• The electric consumption in standby mode is 4 W.
POWER indicator