Panasonic Projector PT-DS20KU User Manual

							Setting up
ENGLISH - 41
Getting Started
To use a screen size not listed in this manual, check the screen size SD and use the following formula to calculate 
projection distance.
The unit of the calculation result is m.
▶■Formula to calculate projection distance per projection lens (for PT-DZ21KU)
Projection lens Throw ratio Aspect ratioProjection distance (L) formula
Zoom Lens ET-D75LE1
1.4 to 1.8:1 16:10
Min. (LW)
L = 1.1732 x SD (m) – 0.0760
Max. (LT) L = 1.5709 x SD (m) – 0.1004
1.4 to 1.8:1 16:9 Min. (LW)
L = 1.2087 x SD (m) – 0.0760
Max. (LT) L = 1.6142 x SD (m) – 0.1004
1.6 to 2.2:1 4:3 Min. (LW)
L = 1.3307 x SD (m) – 0.0760
Max. (LT) L = 1.7756 x SD (m) – 0.1004
ET-D75LE2 1.8 to 2.8:1 16:10
Min. (LW)
L = 1.5748 x SD (m) – 0.0795
Max. (LT) L = 2.3661 x SD (m) – 0.1064
1.8 to 2.8:1 16:9 Min. (LW)
L = 1.6220 x SD (m) – 0.0795
Max. (LT) L = 2.4291 x SD (m) – 0.1064
2.2 to 3.3:1 4:3 Min. (LW)
L = 1.7835 x SD (m) – 0.0795
Max. (LT) L = 2.6772 x SD (m) – 0.1064
ET-D75LE3 2.8 to 4.6:1 16:10
Min. (LW)
L = 2.3661 x SD (m) – 0.0958
Max. (LT) L = 3.9488 x SD (m) – 0.1216
2.8 to 4.6:1 16:9 Min. (LW)
L = 2.4291 x SD (m) – 0.0958
Max. (LT) L = 4.0591 x SD (m) – 0.1216
3.3 to 5.5:1 4:3 Min. (LW)
L = 2.6772 x SD (m) – 0.0958
Max. (LT) L = 4.4724 x SD (m) – 0.1216
ET-D75LE4 4.6 to 7.4:1 16:10
Min. (LW)
L = 3.9488 x SD (m) – 0.1158
Max. (LT) L = 6.2795 x SD (m) – 0.1013
4.6 to 7.4:1 16:9 Min. (LW)
L = 4.0591 x SD (m) – 0.1158
Max. (LT) L = 6.4528 x SD (m) – 0.1013
5.6 to 8.9:1 4:3 Min. (LW)
L = 4.4724 x SD (m) – 0.1158
Max. (LT) L = 7.1102 x SD (m) – 0.1013
ET-D75LE8 7.3 to 13.8:1 16:10
Min. (LW)
L = 6.2795 x SD (m) – 0.3862
Max. (LT) L = 11.7677 x SD (m) – 0.3598
7.3 to 13.8:1 16:9 Min. (LW)
L = 6.4567 x SD (m) – 0.3862
Max. (LT) L = 12.0945 x SD (m) – 0.3598
8.8 to 16.5:1 4:3 Min. (LW)
L = 7.1102 x SD (m) – 0.3862
Max. (LT) L = 13.3189 x SD (m) – 0.3598
ET-D75LE6 0.9 to 1.1:1 16:10
Min. (LW)
L = 0.7913 x SD (m) – 0.0566
Max. (LT) L = 0.9488 x SD (m) – 0.0736
0.9 to 1.1:1 16:9 Min. (LW)
L = 0.8150 x SD (m) – 0.0566
Max. (LT) L = 0.9764 x SD (m) – 0.0736
1.1 to 1.3:1 4:3 Min. (LW)
L = 0.8976 x SD (m) – 0.0566
Max. (LT) L = 1.0748 x SD (m) – 0.0736
ET-D75LE10 1.3 to 1.7:1 16:10
Min. (LW)
L = 1.1181 x SD (m) – 0.0857
Max. (LT) L = 1.4449 x SD (m) – 0.1085
1.3 to 1.7:1 16:9 Min. (LW)
L = 1.1496 x SD (m) – 0.0857
Max. (LT) L = 1.4843 x SD (m) – 0.1085
1.6 to 2.0:1 4:3 Min. (LW)
L = 1.2677 x SD (m) – 0.0857
Max. (LT) L = 1.6378 x SD (m) – 0.1085
ET-D75LE20 1.7 to 2.4:1 16:10
Min. (LW)
L = 1.4331 x SD (m) – 0.0832
Max. (LT) L = 2.0787 x SD (m) – 0.1162
1.7 to 2.4:1 16:9 Min. (LW)
L = 1.4724 x SD (m) – 0.0832
Max. (LT) L = 2.1378 x SD (m) – 0.1162
2.0 to 2.9:1 4:3 Min. (LW)
L = 1.6220 x SD (m) – 0.0832
Max. (LT) L = 2.3543 x SD (m) – 0.1162
ET-D75LE30 2.4 to 4.7:1 16:10
Min. (LW)
L = 2.0630 x SD (m) – 0.1131
Max. (LT) L = 4.0039 x SD (m) – 0.1765
2.4 to 4.7:1 16:9 Min. (LW)
L = 2.1220 x SD (m) – 0.1131
Max. (LT) L = 4.1142 x SD (m) – 0.1765
2.9 to 5.6:1 4:3 Min. (LW)
L = 2.3386 x SD (m) – 0.1131
Max. (LT) L = 4.5315 x SD (m) – 0.1765 
						

							Setting up
42 - ENGLISH
Getting Started
Projection lens Throw ratio Aspect ratioProjection distance (L) formula
Zoom Lens ET-D75LE40 4.6 to 7.4:1 16:10
Min. (LW)
L = 3.9528 x SD (m) – 0.1577
Max. (LT) L = 6.3031 x SD (m) – 0.1615
4.6 to 7.4:1 16:9 Min. (LW)
L = 4.0630 x SD (m) – 0.1577
Max. (LT) L = 6.4764 x SD (m) – 0.1615
5.5 to 8.9:1 4:3 Min. (LW)
L = 4.4764 x SD (m) – 0.1577
Max. (LT) L = 7.1339 x SD (m) – 0.1615
Fixed-Focus  Lens ET-D75LE5
0.7:1 16:10
—L = 0.6063 x SD (m) – 0.0835
0.7:1 16:9
— L = 0.6220 x SD (m) – 0.0835
0.8:1 4:3
— L = 0.6850 x SD (m) – 0.0835
ET-D75LE50 0.7:1 16:10
—L = 0.6063 x SD (m) – 0.0713
0.7:1 16:9
— L = 0.6260 x SD (m) – 0.0713
0.8:1 4:3
— L = 0.6890 x SD (m) – 0.0713
▶■Formula to calculate projection distance per projection lens (for 
PT
-DS20KU)
Projection lens Throw ratio Aspect ratio Projection distance (L) formula
Zoom Lens ET-D75LE1 1.5 to 2.0:1
4:3
Min. (LW)
L = 1.2087 x SD (m) – 0.0760
Max. (LT) L = 1.6142 x SD (m) – 0.1004
16:9 Min. (LW)
L = 1.3150 x SD (m) – 0.0760
Max. (LT) L = 1.7559 x SD (m) – 0.1004
ET-D75LE2 2.0 to 3.0:1 4:3
Min. (LW)
L = 1.6220 x SD (m) – 0.0795
Max. (LT) L = 2.4291 x SD (m) – 0.1064
16:9 Min. (LW)
L = 1.7638 x SD (m) – 0.0795
Max. (LT) L = 2.6457 x SD (m) – 0.1064
ET-D75LE3 3.0 to 5.0:1 4:3
Min. (LW)
L = 2.4291 x SD (m) – 0.0958
Max. (LT) L = 4.0591 x SD (m) – 0.1216
16:9 Min. (LW)
L = 2.6457 x SD (m) – 0.0958
Max. (LT) L = 4.4213 x SD (m) – 0.1216
ET-D75LE4 5.0 to 8.0:1 4:3
Min. (LW)
L = 4.0591 x SD (m) – 0.1158
Max. (LT) L = 6.4528 x SD (m) – 0.1013
16:9 Min. (LW)
L = 4.4213 x SD (m) – 0.1158
Max. (LT) L = 7.0315 x SD (m) – 0.1013
ET-D75LE8 7.9 to 15.0:1 4:3
Min. (LW)
L = 6.4567 x SD (m) – 0.3862
Max. (LT) L = 12.0945 x SD (m) – 0.3598
8.0 to 15.0:1 16:9 Min. (LW)
L = 7.0315 x SD (m) – 0.3862
Max. (LT) L = 13.1732 x SD (m) – 0.3598
ET-D75LE6 1.0 to 1.2:1 4:3
Min. (LW)
L = 0.8150 x SD (m) – 0.0566
Max. (LT) L = 0.9764 x SD (m) – 0.0736
16:9 Min. (LW)
L = 0.8858 x SD (m) – 0.0566
Max. (LT) L = 1.0630 x SD (m) – 0.0736
ET-D75LE10 1.4 to 1.8:1 4:3
Min. (LW)
L = 1.1417 x SD (m) – 0.0857
Max. (LT) L = 1.4764 x SD (m) – 0.1085
16:9 Min. (LW)
L = 1.2441 x SD (m) – 0.0857
Max. (LT) L = 1.6102 x SD (m) – 0.1085
ET-D75LE20 1.8 to 2.6:1 4:3
Min. (LW)
L = 1.4606 x SD (m) – 0.0832
Max. (LT) L = 2.1260 x SD (m) – 0.1162
16:9 Min. (LW)
L = 1.5906 x SD (m) – 0.0832
Max. (LT) L = 2.3150 x SD (m) – 0.1162
ET-D75LE30 2.6 to 5.1:1 4:3
Min. (LW)
L = 2.1102 x SD (m) – 0.1131
Max. (LT) L = 4.0906 x SD (m) – 0.1765
16:9 Min. (LW)
L = 2.2953 x SD (m) – 0.1131
Max. (LT) L = 4.4567 x SD (m) – 0.1765
ET-D75LE40 5.0 to 8.0:1 4:3
Min. (LW)
L = 4.0394 x SD (m) – 0.1577
Max. (LT) L = 6.4370 x SD (m) – 0.1615
16:9 Min. (LW)
L = 4.3976 x SD (m) – 0.1577
Max. (LT) L = 7.0118 x SD (m) – 0.1615
Fixed-Focus  Lens ET-D75LE5 0.8:1
4:3
— L = 0.6220 x SD (m) – 0.0835
16:9 — L = 0.6772 x SD (m) – 0.0835
ET-D75LE50 0.8:1 4:3
— L = 0.6220 x SD (m) – 0.0713
16:9 — L = 0.6772 x SD (m) – 0.0713 
						

							Setting up
ENGLISH - 43
Getting Started
▶■Formula to calculate projection distance per projection lens (for 
PT
-DW17KU)
Projection lens Throw ratio Aspect ratio Projection distance (L) formula
Zoom Lens ET-D75LE1
1.5 to 2.0:1 16:9
Min. (LW)
L = 1.3504 x SD (m) – 0.0760
Max. (LT) L = 1.8031 x SD (m) – 0.1004
2.0 to 2.7:1 4:3 Min. (LW)
L = 1.6496 x SD (m) – 0.0760
Max. (LT) L = 2.2047 x SD (m) – 0.1004
ET-D75LE2 2.1 to 3.1:1 16:9
Min. (LW)
L = 1.8110 x SD (m) – 0.0795
Max. (LT) L = 2.7126 x SD (m) – 0.1064
2.7 to 4.1:1 4:3 Min. (LW)
L = 2.2165 x SD (m) – 0.0795
Max. (LT) L = 3.3228 x SD (m) – 0.1064
ET-D75LE3 3.1 to 5.2:1 16:9
Min. (LW)
L = 2.7126 x SD (m) – 0.0958
Max. (LT) L = 4.5315 x SD (m) – 0.1216
4.1 to 6.9:1 4:3 Min. (LW)
L = 3.3228 x SD (m) – 0.0958
Max. (LT) L = 5.5472 x SD (m) – 0.1216
ET-D75LE4 5.2 to 8.2:1 16:9
Min. (LW)
L = 4.5315 x SD (m) – 0.1158
Max. (LT) L = 7.2087 x SD (m) – 0.1013
6.9 to 11.0:1 4:3 Min. (LW)
L = 5.5472 x SD (m) – 0.1158
Max. (LT) L = 8.8228 x SD (m) – 0.1013
ET-D75LE8 8.2 to 15.4:1 16:9
Min. (LW)
L = 7.2087 x SD (m) – 0.3862
Max. (LT) L = 13.5039 x SD (m) – 0.3598
10.9 to 20.5:1 4:3 Min. (LW)
L = 8.8228 x SD (m) – 0.3862
Max. (LT) L = 16.5354 x SD (m) – 0.3598
ET-D75LE6 1.0 to 1.2:1 16:9
Min. (LW)
L = 0.9094 x SD (m) – 0.0566
Max. (LT) L = 1.0906 x SD (m) – 0.0736
1.4 to 1.6:1 4:3 Min. (LW)
L = 1.1142 x SD (m) – 0.0566
Max. (LT) L = 1.3346 x SD (m) – 0.0736
ET-D75LE10 1.4 to 1.9:1 16:9
Min. (LW)
L = 1.2756 x SD (m) – 0.0857
Max. (LT) L = 1.6496 x SD (m) – 0.1085
1.9 to 2.5:1 4:3 Min. (LW)
L = 1.5630 x SD (m) – 0.0857
Max. (LT) L = 2.0197 x SD (m) – 0.1085
ET-D75LE20 1.8 to 2.7:1 16:9
Min. (LW)
L = 1.6339 x SD (m) – 0.0832
Max. (LT) L = 2.3701 x SD (m) – 0.1162
2.5 to 3.6:1 4:3 Min. (LW)
L = 2.0000 x SD (m) – 0.0832
Max. (LT) L = 2.9055 x SD (m) – 0.1162
ET-D75LE30 2.7 to 5.2:1 16:9
Min. (LW)
L = 2.3543 x SD (m) – 0.1131
Max. (LT) L = 4.5669 x SD (m) – 0.1765
3.6 to 6.9:1 4:3 Min. (LW)
L = 2.8819 x SD (m) – 0.1131
Max. (LT) L = 5.5906 x SD (m) – 0.1765
ET-D75LE40 5.1 to 8.2:1 16:9
Min. (LW)
L = 4.5079 x SD (m) – 0.1577
Max. (LT) L = 7.1890 x SD (m) – 0.1615
6.8 to 10.9:1 4:3 Min. (LW)
L = 5.5197 x SD (m) – 0.1577
Max. (LT) L = 8.8031 x SD (m) – 0.1615
Fixed-Focus  Lens ET-D75LE5
0.8:1
16:9
— L = 0.6929 x SD (m) – 0.0835
1.0:1 4:3
— L = 0.8504 x SD (m) – 0.0835
ET-D75LE50 0.8:1
16:9
— L = 0.6929 x SD (m) – 0.0713
1.0:1 4:3
— L = 0.8465 x SD (m) – 0.0713 
						

							Setting up
44 - ENGLISH
Getting Started
Adjusting adjustable feet
Install the projector on a flat surface so that the front of the projector is parallel to the screen surface and the 
projection screen is rectangular.
If the screen is tilted downward, the projection screen can be adjusted to be rectangular by adjusting the 
adjustable feet. The adjustable feet can also be used to adjust the projector to be level when it is tilted in a 
horizontal direction.
Extend the adjustable feet by rotating in the direction shown in the figure and retract by rotating in the opposite 
direction.
Adjustable range
Front adjustable f\meet: 12 mm \f15/32\b)
Rear adjustable fe\met: 12 mm \f15/32\b)
Attention
 zHot air is expelled from the air exhaust port. Do not touch the air exhaust port directly when adjusting the 
adjustable feet. (
 page 26) 
						

							Attaching/removing the projection lens (optional accessory)
ENGLISH - 45
Getting Started
Attaching/removing the projection lens (optional accessory)
Attaching the projection lens
1) Remove the projection lens cover.
▶zWhile grasp the right and left buttons from 
vertical and horizontal directions, pull the lens 
cover to remove.
2) Insert by aligning the projection lens 
(orange) mark with the mark on the 
projector body (a circle to the left 
of LOCK) and turn clockwise until it 
clicks.
3) Secure the projection lens with the 
lens fixing screw supplied *1.
▶zUse a Phillips screwdriver to secure it in the 
fi
rst screw hole to the right of the projection lens 
(orange) mark.
*1: Some lenses may not have a screw hole to use to secure 
the projection lens.
4) Attach the projection lens cover .
Attention
 zT

urn the projection lens counterclockwise to confirm 
that it does not come out.
 z Store the removed dust sponge in a safe place to 
transport or store.
Removing the projection lens
1) Remove the projection lens cover
.
▶zWhile grasp the right and left buttons from 
vertical and horizontal directions, pull the lens 
cover to remove.
2) Remove the lens fixing screw*1.
▶zUse a Phillips screwdriver to remove the first 
s
crew to the right of the projection lens (orange) 
mark.
*1: Some lenses may not have a screw hole to use to secure 
the projection lens.
3) While pressing the lock button, turn 
the projection lens counterclockwise 
to remove.
▶z Turn counterclockwise until the projection lens 
(orange) mark is at the mark on the projector 
body (the circle to the left of LOCK).
Lock button
4) Attach the projection lens cover and 
dust sponge.
Attention
 z Store the removed lens where it will be free from 
vibration and impact.
 zS

tore the removed lens fixing screw in a safe place.
Move the lens to the home position before replacing or removing the lens. ( page 55)
Attention
 z Replace the projection lens after turning of

f the power of the projector.
 z Do not touch the lens signal receiver

. Dust or dirt may cause defective contact.
 z Do not touch the lens surface with your bare hands.
 zBefore attaching the projection lens, remove the lens cover attached to the projection lens.   
						

							Connecting
46 - ENGLISH
Getting Started
Before connecting
 zBefore connecting, carefully read the operating instructions for the external device to be connected.
 zT

urn off the power of all devices before connecting cables.
 z Acquire 

any connection cable necessary to connect the external device to the system that is either not supplied 
with the device or not available as an option.
 z V

ideo signals containing too much jitter may cause the images on the screen to randomly wobble or wafture. In 
this case, a time base corrector (TBC) must be connected.
 z The projector accepts video signals (including 

Y/C signals), analog RGB signals (synchronous signals are TTL 
level), and digital signals.
 z Some computer models are not compatible with the projector

.
 zUse a cable compensator when you connect devices to the projector using long cables. Otherwise the image 
may not display properly

.
 zRefer to “List of compatible signals” ( page 174) for the types of video signals that can be used with the 
projector
.
▶■  terminal pin assignments and signal names
Outside view
Pin No. Signal name
(4) and (9) are not used.
(5) - (8), (10), and (11) are GND 
terminals.
(10)
(6) (11) (15)
(1) (5)
(1) R/PR
(2)G/G, SYNC/Y
(3) B/P
B
(12)DDC data
(13) HD/SYNC
(14) VD
(15) DDC clock
▶■ terminal pin assignments and signal names
Outside view Pin No. Signal name Pin No. Signal name
(1) T.M.D.S data 2+ (11)T.M.D.S clock shield
(2) T.M.D.S data 2 shield (12)T.M.D.S clock–
Even-numbered pins  (2) to (18) (3) T.M.D.S data 2–(13)CEC
(1)(19)
(2) (18)
(4)
T.M.D.S data 1+ (14)—
(5) T.M.D.S data 1 shield (15)SCL
(6) T.M.D.S data 1– (16)SDA
(7) T.M.D.S data 0+ (17)DDC/CEC
GND
Odd-numbered pins  (1) to (19) (8) T.M.D.S data 0 shield (18)+5 V
(9) T.M.D.S data 0– (19)Hot plug detection
(10) T.M.D.S clock+
Connecting 
						

							Connecting
ENGLISH - 47
Getting Started
▶■ terminal pin assignments and signal names
Outside view Pin No. Signal name Pin No. Signal name
(17)
(24)
(16)
(9)
(1)
(8)
(1) T.M.D.S data 2– (13)—
(2) T.M.D.S data 2+ (14)+5 V
(3) T.M.D.S data 2/4 shield (15)GND
(4) —(16)Hot plug detection
(5) —(17)T.M.D.S data 0–
(6) DDC clock (18)T.M.D.S data 0+
(7) DDC data (19)T.M.D.S data 0/5 shield
(8) —(20) —
(9) T.M.D.S data 1– (21)—
(10) T.M.D.S data 1+ (22)T.M.D.S clock shield
(11) T.M.D.S data 1/3 shield (23)T.M.D.S clock+
(12) —(24)T.M.D.S clock–
Connecting example: AV equipment
▶■For // terminals
The following diagram is a connecting example for PT-DZ21KU and PT-DS20KU.
Blu-ray disc playe\Tr
VCR (TBC \fuilt-in) C\bmputer f\br c\bntr\bl
Attention
 zAlways use one of the following when connecting a VCR.
–

▶
A
  VCR with built-in time base corrector (TBC)
–
▶
A
  time base corrector (TBC) between the projector and the VCR
 zIf nonstandard burst signals are connected, the image may be distorted. In such case, connect the time base 
corrector (TBC) between the projector

.
Note
 z The  terminal can be connected to HDMI- or DVI-D-compliant devices. However
, images may not 
appear or may not be displayed properly on some devices. (
 page 96)
 z The HDMI cable used should be an HDMI High Speed cable that conforms to HDMI standards. If a cable that 
does not meet HDMI standards is used, video may be interrupted or may not be displayed.
 zThe  terminal of the projector can be connected to an external device with an DVI-D terminal by 
using a HDMI/DVI conversion cable, but some devices may not project the image properly or function properly
.
 zThe projector does not support VIERA

 Link (HDMI). 
						

							Connecting
48 - ENGLISH
Getting Started
▶■For / terminals (for PT-DZ21KU and PT-DS20KU only)
+6,VLJQDORU
66,VLJQDO
LJLWDO9&5IRUFRPPHUFLDOXVH
Note
 zUse [SYSTEM SELECT

OR] (
 page 72) to switch the input format.
 zSome external devices to be connected require [SDI IN] ( page 97) to be set.
 zUse a 5CFB or higher (such as 5CFB, or 7CFB) or a Belden 1694A

 or higher connection cable to properly 
transmit images. Use a connection cable of 100 m (328'1") length or less.
 z T

o enter dual link signals, the [SDI LINK] in [SDI IN] must be set.
 z Use the same length and same type of cables to connect / terminals when entering 
dual link signals. If there is a dif

ference of 4 m (13'1") or greater in cable length, images may not be projected 
properly.
 z T

o input dual link signals, connect directly without going through a distributor or other such device to the 
external device which outputs signals. A phase difference may occur between the LINK-A signal and the 
LINK-B signal and images may not be projected properly.
 z W

hen an unsteady signal is connected, an error in signal detection may occur. In such a case, use the [SYSTEM 
SELECTOR] (
 page 72) to switch to a system that matches the signal format. 
						

							Connecting
ENGLISH - 49
Getting Started
Connecting example: Computers
The following diagram is a connecting example for PT-DZ21KU and PT-DS20KU.
&RPSXWHUIRUFRQWURO&RPSXWHU &RPSXWHU&RPSXWHU
&RPSXWHU
Note
 z
The  terminal supports single links only

.
 zFor signals that the projector can project, refer to “List of compatible signals” ( page 174).
 zIf you operate the projector using the computer with the resume feature (last memory), you may have to reset 
the resume feature to operate the projector

.
 z When entering the SYNC ON GREEN signal, do not enter sync signals to the  terminal or the 
 terminal.
 zWhen entering DVI-D, some external devices to be connected require EDID to be set. ( page 96)
 zUse an HDMI cable that conforms to HDMI standards such as an HDMI High Speed cable. If a cable that does 
not meet HDMI standards is used, video may be interrupted or may not be displayed.
 zThe  terminal of the projector can be connected to an external device with an DVI-D terminal by 
using a HDMI/DVI conversion cable, but some devices may not project the image properly or function properly
.
Caution
When connecting the projector to a computer or an external device, use the power cord supplied with each 
device and commercially available shielded cables. 
						

							Switching on/off the projector
50 - ENGLISH
Basic Operation
Switching on/off the projector
Connecting the power cord
Make sure that the supplied power cord is fully inserted into the projector to prevent removal of the 
power cord.
Confirm that the  switch is on the  side before connecting the power cord.
For detailed power cord handling, refer to “Read this first!” (
 pages 2 to 10).
▶■To attach the power cord
1) Check the shapes of the  
terminal and the power cord connector 
and insert the plug securely in the 
correct direction.
2)
 
Insert the power cord plug into an 
electrical outlet.
▶■ To remove the power cord
1) Confirm that the  
switch of the main side is on the 
 side, hold the power plug and 
unplug it from the outlet.
2)
 
Remove the power cord from the  terminal while pressing the lock 
button on the power cord connector

.
Lock Button