Read this user manual carefully before using the product. Pictures shown in this
manual are for reference only. Different models and specifications are subject to
real product.
This manual is only for operation instruction, please contact the local distributor for
maintenance assistance. The functions described in this version were updated till
November, 2019. In the constant effort to improve the product, we reserve the right
to make functions or parameters changes without notice or obligation. Please refer
to the dealers for the latest details.
FCC Statement
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful
interference to radio communications. It has been tested and found to comply with
the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference in
a commercial installation.
Operation of this equipment in a residential area is likely to cause interference, in
which case the user at their own expense will be required to take whatever
measures may be necessary to correct the interference.
Any changes or modifications not expressly approved by the manufacture would
void the user’s authority to operate the equipment.
Page 3
Alfatron ALF-WU4K HUB
SAFETY PRECAUTIONS
To ensure the best from the product, please read all instructions carefully before
using the device. Save this manual for further reference.
Unpack the equipment carefully and save the original box and packing material
for possible future shipment.
Follow basic safety precautions to reduce the risk of fire, electrical shock and
injury to persons.
Do not dismantle the housing or modify the module. It may result in electrical
shock or burn.
Using supplies or parts not meeting the products’ specifications may cause
damage, deterioration or malfunction.
Refer all servicing to qualified service personnel.
To prevent fire or shock hazard, do not expose the unit to rain, moisture or install
this product near water.
Do not put any heavy items on the extension cable in case of extrusion.
Do not remove the housing of the device as opening or removing housing may
expose you to dangerous voltage or other hazards.
Install the device in a place with fine ventilation to avoid damage caused by
overheat.
Keep the module away from liquids.
Spillage into the housing may result in fire, electrical shock, or equipment
damage. If an object or liquid falls or spills on to the housing, unplug the module
immediately.
Do not twist or pull by force ends of the cable. It can cause malfunction.
Do not use liquid or aerosol cleaners to clean this unit. Always unplug the power
to the device before cleaning.
Unplug the power cord when left unused for a long period of time.
Information on disposal for scrapped devices: do not burn or mix with general
household waste, please treat them as normal electrical wastes.
Limited warranty in respect of Alfatron Products Only ............................................ 16
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Alfatron ALF-WU4K HUB
1. Product Introduction
Thanks for choosing the professional ALF-WU4K HUB HDMI 2.0 4x1 Switcher. The
switcher features four HDMI video inputs and one HDMI output. It supports HDMI
video resolution up to 4Kx2K@60Hz 4:4:4 HDR 10 and Dolby Vision. The switcher
provides one stereo audio output for audio de-embedding and provides four type-B
USB ports and three type-A USB ports for KVM management, the four HDMI
computers can be controlled via one keyboard, one mouse and one monitor. In
addition, the switcher features four GR ports to connect ALF-TG table grommets for
source selection and black screen setting. The switcher can also be controlled via
RS232 and front panel buttons.
1.1 Features
4x1 HDMI 2.0 Switcher with KVM.
Supports video resolution up to 4Kx2K@60Hz 4:4:4, HDR 10 and Dolby Vision.
HDCP 2.2 compliant.
Compatible with Windows, Linux and Mac OS.
3.5mm stereo audio output for audio de-embedding.
Convenient and cost-effective USB 3.0 peripheral sharing.
Controls four HDMI computers via one keyboard, one mouse and one monitor.
KVM auto-switching based on TMDS/5V detection.
Controllable by buttons, RS232 commands and ALF-TG table grommets.
Simplifies wiring for easy installation.
1.2 Package List
1x WU4K HUB HDMI 2.0 4x1 Switcher
2x Mounting Ears with 4 Screws
4x Plastic Cushions
4x 3-pin Terminal Blocks
1x RS232 Cable (3-pin to DB9)
1x Power Adapter (12V DC 2A)
1x User Manual
Note: Please contact your distributor immediately if you found any damage or
defect in the components.
1
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Alfatron ALF-WU4K HUB
2. Specification
Video Input
Input (4) SOURCE 1~4
Input Connector (4) Female type-A HDMI
HDMI Input Resolution Up to 4Kx2K@60Hz 4:4:4, HDR10, Dolby Vision
HDMI Standard 2.0
HDCP Version 2.2
Video Output
Output
Output Connector (1) Female type-A HDMI
HDMI Output Resolution Up to 4Kx2K@60Hz 4:4:4, HDR10, Dolby Vision
① POWER LED: The LED illuminates red when power is applied.
② PC LEDs: Total four LEDs, any one of which illuminates blue to indicate its
corresponding type-B USB port is connected to an active PC.
③ SOURCE LEDs: Total four LEDs, any one of which illuminates blue to indicate
its corresponding HDMI port is connected to an active source device.
④ SOURCE BUTTONs: Four buttons for input source selection, one of which
illuminates blue to indicate which source device is selected.
⑤ AUTO: Press it to enable auto switching mode, and it will illuminate blue. Press
again can exit auto switching mode.
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Alfatron ALF-WU4K HUB
GR4
DC 12V
DISPLAY
GR1
GR3
GR2RS232
Tx Rx
OBSM
OBSM
SOURCE 1
PC 1PC 2PC 3PC 4
SOURCE 2SOURCE 3S OURCE 4
DEVICES
OBSM
OBSM
1
3
2
AUDIO OUT
1
4
5
6
8
2
3
7
⑥ FW: Micro-USB port for firmware upgrade.
Note: All the input source LEDs will go out when pressing Black Output button on
the HUG Table Grommet
3.2 Rear Panel
① SOURCE1~SOURCE4: Four type-A female HDMI input ports to connect HDMI
source devices (PC, Blu-ray Disc™ or DVD player, etc.).
② PC1~PC4: Four type-B USB ports to connect PCs. The PC can be a source
device connected to the corresponding HDMI input port.
③ DEVICES (1~3): Three type-A USB ports to connect USB devices (Keyboard,
Mouse or camera, etc.). These USB devices are used to control the PC which
is connected to the selected HDMI input port and the corresponding type-B
USB port. These type-A USB ports can power these USB devices with 1A.
④ DISPLAY: Type-A female HDMI output port to connect display device (e.g.
Projector).
⑤ AUDIO OUT: 3-pin terminal block to connect speakers or amplifiers for audio
output.
⑥ GR1~GR4: Four 3-pin terminal blocks to connect four ALF-TG table grommets
for source selection and black screen setting.
⑦ RS232: 3-pin terminal blocks to a control device (e.g. PC) to control the
switcher.
⑧ DC 12V: Power port for power adapter connection.
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Alfatron ALF-WU4K HUB
GR4
DC 12V
DISP LAY
GR1
GR3
GR2RS232
Tx Rx
OBSM
OBSM
SOURCE 1
PC 1PC 2PC 3PC 4
SOURCE 2SOURCE 3SOURCE 4
DEVICES
OBSM
OBSM
1
3
2
AUDIO OUT
Laptop
MouseKeyboard
Blu-Ray
MacBook
Projector
Speaker
HDMI:
USB:
Control:
Audio:
4. System Connection
4.1 Usage Precaution
Make sure all components and accessories included before installation.
System should be installed in a clean environment with proper temperature and
humidity.
All of the power switches, plugs, sockets, and power cords should be insulated
and safe.
All devices should be connected before power on
4.2 System Diagram
The following diagrams illustrate typical input and output connections that can be
utilized with this switcher:
The switcher is used alone:
5
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Alfatron ALF-WU4K HUB
5. Button Control
Manual Switching
Press button 1~4 to the corresponding HDMI input source.
Auto Switching
Press AUTO to enable auto switch mode, and then the button LED will illuminate
blue.
When in auto mode, the switcher follows the rules in the certain circumstances:
The switcher will automatically switch to the first available active input starting at
input 1 to 4.
Press the source button (1, 2, 3 or 4) can directly change the input source.
New Input: Upon detecting a new input, the switcher will automatically select the
new source.
Detection input signal source: 5V(Default) or TMDS.
Reboot: Once power is restored to the switcher, if the last selected source is still
available, the switcher will still output this signal, otherwise, the switcher will
switch to the first available active input starting at input 1.
Source Removed: When an active source is removed, the switcher will switch to
the first available active input starting at input 1.
Press AUTO again can exit auto switch mode, but the input source will remain
the current setting.
Note: The factory default is auto switching mode.
6. Table Grommet Control
The ALF-TG table grommet can be used for input source selection and black
screen.
Press Show Me on table grommet to select HDMI source.
Press Black Output on table grommet to let display be black screen.
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Alfatron ALF-WU4K HUB
7. RS232 Control
Connect the switcher to the control device (e.g. PC) with RS232 cable and set the
parameters in the right manner, the control device is capable to control this switcher
by RS232 commands.
7.1 RS232 Control Software
Installation: Copy the control software file to the computer connected with this
switcher.
Uninstallation: Delete all the control software files in corresponding file path.
Basic Settings
First of all, please connect all needed input devices and output devices, then to
connect it with a computer which is installed with RS232 control software.
Here take the software CommWatch.exe as example.
Double-click the following icon:
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Alfatron ALF-WU4K HUB
Parameter configuration area
Command sending area
The interface of the control software is shown as below:
Monitoring area, indicates if
the command sent works.
Please set the parameters of COM number, bound rate, data bit, stop bit and the
parity bit correctly, then the RS232 commands can be sent in Command Sending
Area.
Baud rate: 9600;
Data bit: 8;
Stop bit: 1;
Parity bit: none.
8
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Alfatron ALF-WU4K HUB
Feedback
ION
(Factory default).
UNLOCK!
#SET_KEYPAD_LOCK 1
UNLOCK!
@FRONT PANEL LOCK!
0
1
button.
@AUTO PANEL UNLOCK!
@AUTO PANEL LOCK!
_MODE 0
source input to 5V.
TION 0!
_MODE 1
source input to TMDS.
TION 1!
TION 0!
TION 1!
TION 0!
7.2 RS232 Command
Note: All commands need to be ended with “<CR><LF>”.
7.2.1 Device Control
Command Description
Command Example and
#GET_FIRMWARE_VERS
#SET_KEYPAD_LOCK 0
#GET_KEYPAD_LOCK
#SET_AUTO_KEY_LOCK
#SET_AUTO_KEY_LOCK
#GET_AUTO_KEY_LOCK
#SET_HDMI_DETECTION
#SET_HDMI_DETECTION
#GET_HDMI_DETECTIO
N_MODE
#GET_STATUS Get the system status.
Get the software version. @V1.0.0
Unlock the front panel buttons
Lock the front panel buttons. @FRONT PANEL LOCK!
Get the locking status of front panel
buttons.
Unlock the AUTO button. @AUTO PANEL UNLOCK!
Lock the AUTO button. @AUTO PANEL LOCK!
Get the locking status of AUTO
Set the detection method of HDMI
Set the detection method of HDMI
Get the detection method of HDMI
source input.
@FRONT PANEL
@FRONT PANEL
@INPUT_SIGNAL_DETEC
@INPUT_SIGNAL_DETEC
@INPUT_SIGNAL_DETEC
@INPUT_SIGNAL_DETEC
@RS232 QUERY
STATUS!
@WUK4-HUB
@V1.0.0
@FRONT PANEL
UNLOCK!
@HDMI OUT SWITCH TO
AUTO MODE!
@HDMI IN SWITCH TO 1!
@OUTPUT_HDCP 0!
@INPUT_SIGNAL_DETEC
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Alfatron ALF-WU4K HUB
Feedback
@USB SWITCH TO 1!
@RS232 BAUDRATE IS 1!
@HDMI IN SWITCH TO 1!
0!
@RS232 BAUDRATE IS 1!
Feedback
default).
AUTO MODE!
MANUAL MODE!
Command Description
#FACTORY_RESET Restore factory default
#REBOOT Reboot the device. @REBOOT
#HELP Get all commands and its usage. …
Command Example and
@IIS OUT ON!
@SWITCHMODE 0!
@USB SWITCH MODE TO
0!
@AUTO PANEL
UNLOCKED!
@FACTORY DEFAULT!
@WUK4-HUB
@V1.0.0
@HDMI OUT SWITCH TO
AUTO MODE!
@OUTPUT_HDCP 0!
@IIS OUT ON!
@INPUT_SIGNAL_DETEC
TION 0!
@USB SWITCH MODE TO
7.2.2 Signal Switching
Command Description
Command Example and
#SET_AV H1 Switch to HDMI source 1. @HDMI IN SWITCH TO 1!
#SET_AV H2 Switch to HDMI source 2. @HDMI IN SWITCH TO 2!
#SET_AV H3 Switch to HDMI source 3. @HDMI IN SWITCH TO 3!
#SET_AV H4 Switch to HDMI source 4. @HDMI IN SWITCH TO 4!
#GET_AV Get the current HDMI source. @HDMI IN SWITCH TO 1!
#GET_SWITCH_MODE Get the switching mode.@SWITCHMODE 0!
#SET_SWITCH_USB
[PARAM]
#GET_SWITCH_USB Get the PC which switching USB to. @USB SWITCH TO 1!
#SET_USB_SWITCH_MO
DE 0
#SET_USB_SWITCH_MO
DE 1
Switching mode 2. Normal
Switch USB to [PARAM].
[PARAM] = 1~4.
1 - PC1
2 - PC2
3 - PC3
Set USB switching mode to follows
the video switching.
Set USB switching mode to
command control by
Command Example and
@HDMI OUT SWITCH TO
@HDMI OUT SWITCH TO
@SWITCHMODE 0!
@SET SWITCH MODE 1!
@SET USB SWITCH TO
1!
#SET_USB_SWITCH_MO
DE 0
@SET USB SWITCH
MODE 1!
#GET_USB_SWITCH_MO
DE
7.2.3 Audio Setting
Command Description
#SET_IIS 1 Turn on stereo audio output. @IIS OUT ON!
#SET_IIS 0 Turn off stereo audio output. @IIS OUT OFF!
#GET_IIS Get the stereo audio output status.
Get USB switching mode.
11
@USB SWITCH MODE
TO 0!
Command Example and
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Alfatron ALF-WU4K HUB
Feedback
… …
0001
SUCCESSFULLY!
Feedback
version of source device.
7.2.4 EDID Management
Command Description
[PARAM]= 0000~0011
[PARAM]=0000, set the EDID mode
to Pass-through (Factory default). If
the source device can’t read EDID
#SET_EDID_MODE
[PARAM]
#GET_EDID_MODE Get the EDID mode. @EDID_MODE 0000!
#EDIDR [PARAM]
from display device, it will use the
built-in EDID: 3840x2160@60Hz
Deep Color Stereo Audio.
[PARAM]=0001/0010/0011, set the
EDID of source device to user-
defined EDID 0001/0010/0011.
Get the EDID value.
[PARAM]= 0000~0011.
Command Example and
#SET_EDID_MODE 0000
@EDID_MODE 0000!
@EDID HEX STRING OF
'0000':
00 FF FF FF FF FF FF 00
41 0C F2 08 50 12 00 00
#UPLOAD_USER_EDID
#UPLOAD_USER_EDID
[PARAM]
7.2.5 HDCP Setting
Command Description
#SET_OUTPUT_HDCP 0
[PARAM]=0001/0010/0011, upload
user-defined EDID. When the
command applied, system prompts
to upload the EDID file (.bin).
Operation will be cancelled in 10
seconds.
Set the HDCP mode of HDMI
output to PASSIVE mode (Factory
default).
The HDCP of HDMI output
automatically follows the HDCP
12
@PLEASE SEND THE
EDID FILE!
… …
@RECEIVED THE FILE,
LENGTH=256!
@EDID0001 UPDATE
Command Example and
@OUTPUT_HDCP 0!
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Alfatron ALF-WU4K HUB
Feedback
HDCP too.
output.
Feedback
Feedback
ALREADY OFF!
ALREADY ON!
@THE DISPLAY IS OFF!
@THE DISPLAY IS ON!
Command Description
Set the of HDMI output to ACTIVE
mode.
If the input video has HDCP
content, the HDCP version of HDMI
#SET_OUTPUT_HDCP 1
#GET_OUTPUT_HDCP
output is HDCP 1.4 for broader
video solution.
If the input video has no HDCP
content, the HDMI output has no
Get the HDCP mode of HDMI
Command Example and
@OUTPUT_HDCP 1
@OUTPUT_HDCP 0!
7.2.6 Baud Rate Setting
Command Description
#SET_RS232_BAUD 1 Set RS232 baud rate to 9600.@RS232 BAUDRATE IS 1!
#SET_RS232_BAUD 2 Set RS232 baud rate to 19200@RS232 BAUDRATE IS 2!
#SET_RS232_BAUD 3 Set RS232 baud rate to 38400@RS232 BAUDRATE IS 3!
#SET_RS232_BAUD 4 Set RS232 baud rate to 57600@RS232 BAUDRATE IS 4!
#SET_RS232_BAUD 5 Set RS232 baud rate to 115200@RS232 BAUDRATE IS 5!
#GET_RS232_BAUD Get the RS232 baud rate. @RS232 BAUDRATE IS 1!
Command Example and
7.2.7 Display Control
Command Description
Command Example and
#SET_THE_DISPLAY_TO 0 Set the display to output black
#SET_THE_DISPLAY_TO
1
#GET_THE_DISPLAY Get the status of display device.
screen.
Wake up the display screen.
13
@THE DISPLAY SIDE
SCREEN IS BLACK!
@THE DISPLAY IS
@WAKE UP THE
SCREEN!
@THE DISPLAY IS
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Alfatron ALF-WU4K HUB
8. Firmware Upgrade
Please follow the steps as below to upgrade firmware by the FW port on the front
panel:
1) Prepare the latest upgrade file (.bin) and rename it as “FW_MERG.bin” on PC.
2) Power off the switcher and connect the FW port of switcher to the PC with USB
cable.
3) Power on the switcher, and then the PC will automatically detect a U-disk
named of “BOOTDISK”.
4) Double-click the U-disk, a file named of “READY.TXT” would be showed.
5) Directly copy the latest upgrade file (.bin) to the “BOOTDISK” U-disk.
6) Reopen the U-disk to check the filename “READY.TXT” whether automatically
becomes “SUCCESS.TXT”, if yes, the firmware was updated successfully,
otherwise, the firmware updating is fail, the name of upgrade file (.bin) should be
confirm again, and then follow the above steps to update again.
7) Remove the USB cable after firmware upgrade.
8) After firmware upgrade, the switcher should be restored to factory default by
sending command.
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Alfatron ALF-WU4K HUB
Problems
Potential Causes
Solutions
POWER indicator
9. Troubleshooting & Maintenance
Output image with white
noise.
No output image when
switching.
doesn’t work or no
respond to any
operation.
Cannot control the
device by control device
(e.g. a PC) through
RS232 port.
Bad quality of the
connecting cable.
Fail or loose connection.
No signal at the input /
output end.
Fail or loose connection.
The switcher is broken.
Fail connection of power
cord.
Wrong RS232
communication
parameters.
Broken RS232 port.
Try another high-quality
cable.
Make sure the
connection is good
Check with oscilloscope
or multimeter if there is
any signal at the input/
output end.
Make sure the
connection is good.
Send it to an authorize
dealer for repairing.
Make sure the power
cord connection is good.
Type in correct RS232
communication
parameters.
Send it to authorized
dealer for checking.
If your problem persists after following the above troubleshooting steps, seek further
help from authorized dealer or our technical support.
15
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Alfatron ALF-WU4K HUB
10. Warranty
Limited warranty in respect of Alfatron Products Only
1.1 This limited warranty covers defects in materials and workmanship in this
product.
1.2 Should warranty service be required, proof of purchase must be presented to
the Company. The serial number on the product must be clearly visible and not
have been tampered with in any way whatsoever.
1.3 This limited warranty does not cover any damage, deterioration or malfunction
resulting from any alteration, modification, improper or unreasonable use or
maintenance, misuse, abuse, accident, neglect, exposure to excess moisture, fire,
improper packing and shipping (such claims must be presented to the carrier),
lightning, power surges, or other acts of nature. This limited warranty does not cover
any damage, deterioration or malfunction resulting from the installation or removal
of this product from any installation, any unauthorized tampering with this product,
any repairs attempted by anyone unauthorized by the Company to make such
repairs, or any other cause which does not relate directly to a defect in materials
and/or workmanship of this product. This limited warranty does not cover equipment
enclosures, cables or accessories used in conjunction with this product.
This limited warranty does not cover the cost of normal maintenance. Failure of the
product due to insufficient or improper maintenance is not covered.
1.4 The Company does not warrant that the product covered hereby, including,
without limitation, the technology and/or integrated circuit(s) included in the product,
will not become obsolete or that such items are or will remain compatible with any
other product or technology with which the product may be used.
1.5 Only the original purchaser of this product is covered under this limited warranty.
This limited warranty is not transferable to subsequent purchasers or owners of this
product.
1.6 Unless otherwise specified, the goods are warranted in accordance with the
manufacturer’s product specific warranties against any defect attributable to faulty
workmanship or materials, fair wear and tear being excluded.
1.7 This limited warranty only covers the cost of faulty goods and does not include
the cost of labor and travel to return the goods to the Company’s premises.
1.8 In the event of any improper maintenance, repair or service being carried out by
any third persons during the warranty period without the Company’s written
authorization, the limited warranty shall be void.
1.9 A 7 (seven) year limited warranty is given on the aforesaid product where used
correctly according to the Company’s instructions, and only with the use of the
Company’s components.
1.10 The Company will, at its sole option, provide one of the following three
remedies to whatever extent it shall deem necessary to satisfy a proper claim under
this limited warranty:
16
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Alfatron ALF-WU4K HUB
1.10.1 Elect to repair or facilitate the repair of any defective parts within a
reasonable period of time, free of any charge for the necessary parts and labor to
complete the repair and restore this product to its proper operating condition.; or
1.10.2 Replace this product with a direct replacement or with a similar product
deemed by the Company to perform substantially the same function as the original
product; or
1.10.3 Issue a refund of the original purchase price less depreciation to be
determined based on the age of the product at the time remedy is sought under this
limited warranty.
1.11 The Company is not obligated to provide the Customer with a substitute unit
during the limited warranty period or at any time thereafter.
1.12 If this product is returned to the Company this product must be insured during
shipment, with the insurance and shipping charges prepaid by the Customer. If this
product is returned uninsured, the Customer assumes all risks of loss or damage
during shipment. The Company will not be responsible for any costs related to the
removal or re-installation of this product from or into any installation. The Company
will not be responsible for any costs related to any setting up this product, any
adjustment of user controls or any programming required for a specific installation
of this product.
1.13 Please be aware that the Company’s products and components have not been
tested with competitor’s products and therefore the Company cannot warrant
products and/or components used in conjunction with competitor’s products.
1.14 The appropriateness of the goods for the purpose intended is only warranted
to the extent that the goods are used in accordance with the Company’s installation,
classification and usage instructions.
1.15 Any claim by the Customer which is based on any defect in the quality or
condition of the goods or their failure to correspond with specification shall be
notified in writing to the Company within 7 days of delivery or (where the defect or
failure was not apparent on reasonable inspection by the Customer) within a
reasonable time after discovery of the defect or failure, but, in any event, within 6
months of delivery.
1.16 If delivery is not refused, and the Customer does not notify the Company
accordingly, the Customer may not reject the goods and the Company shall have no
liability and the Customer shall pay the price as if the goods had been delivered in
accordance with the Agreement.
1.17 THE MAXIMUM LIABILITY OF THE COMPANY UNDER THIS LIMITED
WARRANTY SHALL NOT EXCEED THE ACTUAL PURCHASE PRICE PAID FOR
THE PRODUCT
17
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