ViewSonic Power Supply VS375C User Manual

User’s Guide  
Value Series  
Model VS375C, VS575C  
 
LIMITED WARRANTY  
What the warranty covers:  
We warrant this product to be free from defects in material and workmanship during the  
warranty period. If a product proves to be defective in material or workmanship during the  
warranty period, we will at our sole option repair or replace the product with a like product.  
How long the warranty is effective:  
For accurate warranty period and conditions, please contact local branch offices or your  
dealers.  
Who the warranty protects:  
This warranty is valid only for the first consumer purchaser.  
What the warranty does not cover:  
1. Any product on which the serial number has been defaced, modified or removed.  
2. Damage, deterioration or malfunction resulting from:  
a) Accident, misuse, neglect, fire, water, or other acts of nature, unauthorized  
product modification, or failure to follow instructions supplied with the product.  
b) Repair or attempted repair by anyone not authorized.  
c) The fault is result of accidental damage or damage in transit or transportation,  
including but not limited to liquid spillage.  
d) Removal or installation of the product.  
e) Causes external to the product.  
f)  
Use of supplies or parts not meeting our specifications.  
g) Normal wear and tear.  
h) Any other cause which does not relate to a product defect.  
3. Removal, installation and set-up service charges.  
 
Limitation of implied warranties:  
THERE ARE NO WARRANTIES, EXPRESS OR IMPLIED, WHICH EXTEND BEYOND THE  
DESCRIPTION CONTAINED HEREIN INCLUDING THE IMPLIED WARRANTY OF  
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  
Exclusion of damages:  
OUR LIABILITY IS LIMITED TO THE COST OF REPAIR OR REPLACEMENT OF THE  
PRODUCT. WE SHALL NOT BE LIABLE FOR:  
1. DAMAGE TO OTHER PROPERTY CAUSED BY ANY DEFECTS IN THE  
PRODUCT*, DAMAGES BASED UPON INCONVENIENCE, LOSS OF USE OF THE  
PRODUCT, LOSS OF TIME, LOSS OF PROFITS, LOSS OF BUSINESS  
OPPORTUNITY, LOSS OF GOODWILL, LOSS OF DATA, LOSS OF SOFTWARE,  
COSTS OF SUBSTITUTE EQUIPMENT, INTERFERENCE WITH BUSINESS  
RELATIONSHIPS, CLAIMS BY THIRD PARTIES, OR OTHER COMMERCIAL  
LOSS, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.  
2. ANY OTHER DAMAGES, WHETHER INCIDENTAL, CONSEQUENTIAL OR  
OTHERWISE.  
3. ANY CLAIM AGAINST THE CUSTOMER BY ANY OTHER PARTY.  
Effect of state law (for US):  
This warranty gives you specific legal rights, and you may also have other rights which vary  
from state to state. Some states do not allow limitations on implied warranties and/or do not  
allow the exclusion of incidental or consequential damages, so the above limitations and  
exclusions may not apply to you.  
Limitations of Warranty (for Australian States and Territories)  
The Trade Practices Act 1974 and corresponding State and Territory Fair Trading Acts or  
legalization of another Government (“the relevant acts”) in certain circumstances imply  
mandatory conditions and warranties which cannot be excluded. This warranty is in  
addition to and not in replacement for such conditions and warranties. To the extent  
permitted by the Relevant Acts, in relation to your product and any other materials  
provided with the product (“the Goods”) the liability of Opti Australia under the Relevant  
Acts is limited, at the option of Opti Australia to:  
Replacement of the Goods; or  
Repair of the Goods; or  
Payment of the cost of replacing the Goods; or  
Payment of the cost of having the Goods repaired.  
Opti Australia reserves the right to request proof of purchase upon  
any warranty claim.  
 
Life Support:  
We do not recommend the use of our UPS products for life support equipment or direct care  
where failure of a UPS product could cause failure of, or diminished effectiveness of the life  
support equipment or patient care.  
*Except as expressly provided for by the UPS “Equipment Protection Policy”  
EFFECTIVE October 1, 1997  
 
 
VS375C/VS575C  
1
IMPORTANT SAFETY INSTRUCTIONS  
!
SAVE THESE INSTRUCTIONS  
THIS MANUAL CONTAINS IMPORTANT SAFETY INSTRUCTIONS.  
KEEP THIS MANUAL HANDY FOR REFERENCE.  
CAUTION: A BATTERY CAN PRESENT A RISK OF ELECTRICAL SHOCK, BURNS  
FROM HIGH SHORT-CIRCUIT CURRENT, FIRE OR EXPLOSION FROM VENTED  
GASES. OBSERVE PROPER PRECAUTIONS.  
WHEN REPLACING BATTERIES, USE THE SAME NUMBER AND THE FOLLOWING  
TYPE BATTERIES: SEALED LEAD-ACID MAINTENANCE FREE (VS375C: 1 X  
3.5AH/12V; VS575C: 1 X 3.8AH/12V)  
PROPER DISPOSAL OF BATTERIES IS REQUIRED. REFER TO YOUR LOCAL  
CODES FOR DISPOSAL REQUIREMENTS.  
 
2
VS375C/VS575C  
!
CAUTION:  
THE UPS CONTAINS VOLTAGES WHICH ARE POTENTIALLY  
HAZARDOUS. ALL REPAIRS SHOULD BE PERFORMED BY  
QUALIFIED SERVICE PERSONNEL.  
THE UPS HAS ITS OWN INTERNAL ENERGY SOURCE (BATTERY).  
THE OUTPUT RECEPTACLES MAY BE LIVE EVEN WHEN THE UPS IS  
NOT CONNECTED TO AN AC SUPPLY.  
Safe and continuous operation of the UPS depends partially on the care taken by users. Please  
observe the following precautions.  
Do not disassemble the UPS.  
Do not attempt to power the UPS from any receptacle except  
3-wire grounded receptacle.  
a
2-pole  
Do not place the UPS near water or in environments of excessive humidity.  
Do not allow liquid or any foreign objects to get inside the UPS.  
Do not block air vents on the side of the UPS.  
Do not plug appliances, such as hair dryers, into the UPS receptacles.  
Do not place the UPS under direct sunshine or close to heat-emitting sources.  
This UPS is intended for installation in a temperature controlled, indoor area free of  
conductive contaminants.  
The socket-outlet shall be installed near the UPS and easily accessible.  
With the installation of the UPS it should be prevented, that the sum of the leakage  
current of the UPS and the connected consumer exceeds 3.5mA.  
The battery supply should be disconnected in the plus and minus pole at the quick  
connectors of the battery when maintenance or service work inside the UPS is  
necessary.  
Do not dispose of batteries in a fire. The battery may explode.  
Do not open or mutilate the battery or batteries, released electrolyte is harmful to the skin  
and eyes.  
A battery can present a risk of electric shock and high short circuit current. The following  
precaution should be observed when working on batteries  
* Remove watches, rings or other metal objects.  
* Use tools with insulated handles.  
z
To reduce the risk of fire, connect only to a circuit provided with 20 amperes maximum  
branch circuit overcurrent protection in accordance with the National Electrical Code.  
ANSI/NFPA 70.  
 
VS375C/VS575C  
3
FEDERAL COMMUNICATIONS COMMISSION (FCC)  
WARNING:  
This equipment 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  
residential installation.  
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. However there is no  
guarantee that interference will not occur in a particular installation. If this  
equipment does cause harmful interference to radio or television reception,  
which can be determined by turning the equipment off and on, the user is  
encouraged to try to correct the interference by one or more of the following  
measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and the receiver.  
Connect the equipment into an outlet on a circuit different from that to  
which the receiver is connected.  
Consult the dealer or an experienced radio/TV technician for help.  
CANADIAN DEPARTMENT OF COMMUNICATIONS (DOC)  
This equipment does not exceed Class B limits for radio noise  
emissions from digital apparatus set out in the Radio Interference  
Regulation of the Canadian Department of Communications.  
Operation in a residential area may cause Unacceptable  
interference to radio and TV reception requiring the owner or  
operator to take whatever steps are necessary to correct the  
interference.  
 
4
VS375C/VS575C  
TABLE OF CONTENTS  
1. INTRODUCTION  
1.1  
1.2  
1.3  
1.4  
1.5  
1.6  
Overview  
5
Frequency Auto-Selection  
User Replaceable Battery Design  
Over Voltage and Under Voltage Protection  
Schedule Shutdown & Startup  
Data-Line Surge Protection  
5
5
6
6
6
2. UPS CONTROLS  
2.1  
2.2  
2.3  
2.4  
2.5  
2.6  
2.7  
External Views  
7
7
8
8
8
8
8
Power On/Off Button  
Status Indicators  
Communication Port  
Data Line Surge Protection  
AC Input  
Output Outlet  
3. INSTALLATION AND OPERATION  
3.1  
3.2  
3.3  
3.4  
3.5  
3.6  
3.7  
Unpacking and Inspection  
9
9
9
10  
11  
11  
12  
Placement  
Determining How Much Equipment You Can Connect to Your UPS  
Powering Up Your UPS  
Connecting Your Equipment to the UPS  
Operation and Function Test  
Storage Instructions  
4. SPECIFICATIONS  
4.1  
4.2  
4.3  
Electrical Specifications  
13  
14  
14  
Mechanical Specifications  
Environmental Specifications  
5. TROUBLESHOOTING  
5.1  
Troubleshooting Chart  
15  
6. USER REPLACEABLE BATTERY  
6.1  
6.2  
Warning  
16  
17  
Battery Replacement Procedure for 500VS II  
 
VS375C/VS575C  
5
1.  
INTRODUCTION  
1.1 Overview  
The Value Series of Uninterruptible Power Systems (UPS) was designed to prevent  
spikes, transients and blackouts from reaching your sensitive equipment. Your equipment  
may include such items as computers and computerized instruments to  
telecommunication systems. When AC power is present, the UPS filters the power  
continuously. When AC power fails, the unit employs its internal maintenance-free battery  
to supply back-up power without interruption.  
1.2 Frequency Auto Sensing  
The VS models can operate in either a 50 or 60 Hz environment. When you plug the UPS  
into an AC outlet and turn it on, it will automatically detect the incoming line frequency and  
configure itself to match that frequency.  
1.3 User Replaceable Battery Design  
The battery is the most critical part in a UPS. The average lifetime of a battery is between  
3 and 5 years. The special user-replaceable battery design of this UPS provides  
significant savings and gives the UPS an almost unlimited life. You can replace the battery  
very easily, and without turning off your UPS or the equipment it is protecting.  
Many UPS’s provide only a basic power failure warning. The Value Series, together with  
OPTI-SAFE Xtreme also provides you with important operating information. If OPTI-SAFE  
Xtreme is not part of your UPS package, you can purchase it from your local dealer.  
 
6
VS375C/VS575C  
1.4 Over Voltage and Under Voltage Protection  
The UPS will switch to backup mode and provide the power from its internal battery when  
the input line voltage is too low or too high.  
1.5 Schedule Shutdown & Startup  
Using OPTI-SAFE Xtreme you can locally or remotely control the shutdown and startup of  
equipment connected to a UPS. A customized schedule can be developed to meet your  
specific requirements.  
1.6 Data-Line Surge Protection  
The built-in data-line surge suppression on the rear panel completes your system  
protection. It provides an easy way to protect a network (RJ45) or modem (single line  
phone) connection from hazardous spikes.  
 
VS375C/VS575C  
7
2.  
UPS CONTROLS  
2.1  
External Views  
2.2  
Power On/Off/Test/Silence Button:  
The On/Off/Test/Silence Button has four functions:  
1.  
When the UPS is off and AC power is present, press this button for more than 3  
seconds to turn on the UPS. The UPS can be turned on even when AC power is  
not present.  
2.  
3.  
When the UPS is on, press this button for more than 3 seconds to turn off the  
UPS and output power.  
When the UPS is operating in “Battery” mode, you can silence the alarm by  
quickly pressing the power button. (This function is disabled when the UPS has  
a “LOW BATTERY” or “OVERLOAD” condition).  
4.  
Quickly press the button while the UPS is under “AC” mode, and the UPS will  
perform an automatic self-test procedure.  
*
“No load shut down” function: As a battery saving feature, the UPS will  
automatically turn off if none of the connected equipment is operating while the  
UPS is in back-up mode. Once normal utility power returns, the unit will wake up  
automatically.  
2.3 Status Indication  
UPS Status Indication: Front Panel LED  
 
8
VS375C/VS575C  
When this Green LED is lit, the UPS is in normal mode,  
AC Mode  
and providing power to your equipment. The UPS will  
continue to filter and provide surge protection.  
When this Yellow LED is lit, the UPS is providing power  
from its battery. Also, this LED is lit when you press the  
button to test the battery.  
Battery Mode  
This Red LED indicator indicates two statuses of the UPS:  
When this Red LED is on, it indicates that the battery  
needs to be replaced. When this Red LED is flashing  
rapidly, it indicates the UPS is over loaded.  
Battery Fault  
2.4 Communication Port (Remote Port)  
This port allows for a computer to monitor the status and control the operation of the UPS.  
Its functions include the following:  
To broadcast a warning when power fails.  
To close any open files before the battery reserves are exhausted.  
To turn off the UPS.  
*Note that software and the communication cable are only available in certain areas.  
Contact your local dealer for more information.  
2.5 Data Line Surge Protection (In & Out)  
The data line surge protection on the rear panel provides an easy way to protect a network  
(RJ45) or modem(RJ11) connection from hazardous spikes. Connect a network cable or a  
single line telephone into the “In” socket. To complete the connection, connect another  
network cable or telephone line into the “Out” socket.  
2.6 AC Input  
Connect the AC power cord into the AC Input socket. UPS can have power from  
commercial electricity. It has a fuse in the socket to protect over current. The spare fuse  
also inside the socket for replacing.  
2.7 Output outlet  
There are two kinds function output outlets:  
1. Bypass : These output outlets offer surge protection only. It won’t have back up  
power at inverter mode.  
2. UPS outlet : These output outlets not only offer surge protection but also back up  
power to your main equipments at inverter mode.  
 
VS375C/VS575C  
9
3. INSTALLATION AND OPERATION  
Before installation, please read and understand the following instructions:  
3.1 Unpacking and Inspection  
Examine the packing carton for damage and accessory in the box. Notify the carrier  
immediately if damage is observed.  
* UPS *1  
* User Manual *1  
* Power Cord *1  
* CD-ROM *1  
* Communication Cable *1  
* Telephone Line *1  
3.2 Placement  
1. This unit is intended for indoor use only. Although your UPS is very rugged, its  
internal components are not sealed from the environment.  
2. The UPS must be installed in a protected environment away from heat-emitting  
appliances such as heaters or radiators. Do not install this product where excessive  
moisture is present.  
3. The location should provide adequate air flow around the UPS with one inch  
minimum clearance on all sides for proper ventilation.  
3.3 Determining How Much Equipment You Can Connect to Your UPS  
1. Make a list of all equipment that requires protection.  
2. Each piece of equipment has voltage and current (VA) ratings printed on the back  
label (see examples below). Your equipment may have a voltage rating such as 88-  
264V. If you live in the United States you should use 120V in your calculations, since  
the standard voltage in the United States is 120V.  
 
10  
VS375C/VS575C  
Computer Co  
Pentium Pro 200MHz  
120V 2.0A  
ViewSonic G810  
120V 2.7A  
50 / 60 Hz  
50/60 Hz  
SN: Q771515388  
SN: 123456  
3. Multiply the voltage and current of each piece of equipment (VA requirements); for  
example, 120V x 2.7A = 324VA, 120V x 2.0A = 240VA.  
Add up the VA requirements for all the devices; for example, 324VA + 240VA =  
564VA.  
4. Make sure that your UPS has at least as much VA capacity as your equipment  
requires.  
3.4 Powering Up Your UPS  
1. For 100/110V/120V versions, connect the power cord to a grounded 3-wire  
receptacle. For 220V/230V/240V versions, please refer to Sec 3.5 .  
2. Power up the UPS by pressing the On/Off switch on the front panel for three  
seconds.  
3. We recommend that you charge the battery for six (6) hours before first use of your  
UPS. You may use the UPS immediately without charging the battery, but the  
backup time may be less than the rating. The UPS recharges the battery  
automatically whenever AC power is available.  
 
VS375C/VS575C  
11  
3.5 Connecting Your Equipment to the UPS  
1. For all UPS models except the 2x0V versions: connect the power cord(s) of your  
computer equipment to the output receptacle(s) of the UPS. Switch on the computer  
equipment.  
2.  
For 2x0V versions, as shown in the illustration below: connect the input power cord  
of your computer equipment to the inlet of the UPS and the wall socket. Use the  
power cord supplied with the UPS to connect from the outlet of the UPS to your  
equipment. Switch on the computer  
3. DO NOT PLUG LASER PRINTERS INTO THE UPS BECAUSE THEY TYPICALLY  
DRAW TOO MUCH POWER  
3.6 Operation and Function Test  
1. Connect the input power and turn on the UPS. The front panel Normal Mode LED will  
light.  
2. The UPS may be overloaded if the UPS buzzer sounds continuously and the Battery  
Fault LED flashes. Unplug the least critical devices, such as a printer, etc. If the  
buzzer is still sounding, the battery or UPS may be faulty. Contact your local dealer  
for assistance.  
 
12  
VS375C/VS575C  
Note: Backup all unsaved files before you perform the following functional test.  
3. To test the backup function, you may unplug the power cord of the UPS. During this  
test, observe that your equipment operates properly and without interruption. If you  
leave your UPS on continuously, it is a good idea to perform a backup function test at  
least once a month.  
4. If you unplug the power cord, all models will beep once every 4 seconds and the  
Battery Mode LED will light. You can press the Test/Silence Button to silence the  
alarm. Plug the power cord back in after a few seconds.  
3.7 Storage Instructions  
For extended storage in moderate climates, the battery should be charged for 12  
hours every 3 months. Repeat it every 2 months in high temperature locations. Plug  
in the power cord to charge the battery.  
 
VS375C/VS575C  
13  
4. SPECIFICATIONS  
4.1 Electrical Specifications  
Product Name  
VS375C  
Frequency (Hz)  
Voltage (V)  
100 / 110 / 120  
220 / 230 / 240  
100 / 110 / 120  
220 / 230 / 240  
Capacity VA / W  
50/60  
50/60  
375VA / 225W  
VS575C  
575VA / 345W  
Input/Output Voltage  
AC Line Voltage  
Version  
100 / 110 / 120V  
220 / 230 / 240V  
Lower Limit  
85/ 94/ 102V  
165/ 184/ 192V  
Upper Limit  
120 / 134 / 138V  
275 / 276 / 276V  
Input/Output Frequency Range  
Input  
50 Hz / 60 Hz ± 10%  
Output (Inverter mode)  
50 Hz / 60 Hz ± 0.3 Hz  
Wave Form :  
Sine wave  
Step wave  
AC Mode  
Back-Up Mode  
Transfer Time:  
4 ms (typical)  
Power failure AC  
inverter  
Spike/Surge Protection:  
Single pulse 8/20us  
Continuous  
Voltage Vrms  
175V  
Version  
Imax  
6500A  
6500A  
Joules  
1050  
1050  
100/110/120  
220/230/240  
300V  
Data-Line Surge Suppression:  
Telephone Line Surge Protection  
+/- 6KV Peak  
(1.2µS/50 Waveform)  
<1%  
10/100 Base-T Protection Let  
Through Rating  
(From 6KV/125A Normal Mode Surge)  
 
14  
VS375C/VS575C  
Audible Alarm:  
Battery discharge at power failure  
Beep every 4 seconds  
Beep every second  
Continuous buzzer  
Battery approaches final discharge  
Overload  
4.2 Mechanical Specifications:  
Product Name  
Dimensions  
Weight (Kg)  
Net  
2.2  
2.3  
Gross  
2.9  
3.0  
W × D × H (mm)  
200*77*175  
200*77*175  
VS375C  
VS575C  
4.3 Environmental Specifications:  
Operating  
Storage and Shipment  
0 ~ 40°C (32° ~ 104°F)  
5 ~ 90% (non-condensing)  
3,000 m (10,000 ft) (Max.)  
-20° ~ +60°C (-4° ~ +140°F)  
5 ~ 90% (non-condensing)  
12,000 m (40,000 ft) (Max.)  
Temperature  
Humidity  
Altitude  
 
VS375C/VS575C  
15  
5. TROUBLESHOOTING  
If the UPS fails to operate properly, please review the following steps before calling the  
repair center:  
1. Is the UPS plugged into a proper working outlet?  
2. Is the line voltage within the rating specified?  
3. Does the circuit breaker on the rear panel need to be reset?  
5.1 Troubleshooting Chart  
Problem  
Possible Cause  
UPS front panel on/off  
switch has not been  
pressed  
Corrective Action  
Press the On/Off switch for  
two seconds  
Normal condition, “No load  
Load less than 20W at  
battery mode  
UPS can not turn on  
and has no alarm.  
shutdown  
active  
function”  
is  
Battery voltage less than Recharge the UPS for at  
10V  
least 6 hours  
Contact dealer or OPTI-  
UPS service  
PCB failure  
Very low or very high line  
voltage.  
Normal condition  
Battery LED (amber)  
is lit and UPS beeps UPS input power cord is  
Plug in input power cord  
Replace the AC fuse  
every 4 seconds  
not plugged in  
AC Fuse burned out  
The UPS Overload  
LED (red) is always lit  
Remove the least critical  
devices from the load  
&
there  
is  
a
UPS is overloaded  
continuous sounding  
alarm  
The UPS Battery  
Weak LED (red) is  
always lit  
Battery voltage too low  
Dead battery  
Recharge the battery and  
reset  
Plug the UPS into an AC  
outlet and recharge the  
Backup time is less  
than the rating  
Battery is not fully charged  
or battery is dead  
battery for  
6
hours. If  
problem remains, replace  
the battery  
UPS appears to be  
functioning normally Computer input power cord Check the computer input  
but the computer is loose or not connected  
won’t turn on  
power cord  
Software  
communication  
working  
Wrong interface cable  
Purchase the correct one  
from your distributor  
not  
 
16  
VS375C/VS575C  
6. USER REPLACEABLE BATTERY  
The Batteries inside your UPS should last from between 3 to 5 years. If you suspect that  
the batteries are weak, allow the UPS to charge the batteries for at least six hours and  
then test the backup time. If the UPS still does not provide adequate backup time, follow  
the procedures below to replace the batteries. Please read section 6.1 before performing  
the procedure in sections 6.2.  
6.1 Warning  
Servicing of batteries should always be performed or supervised by personnel  
knowledgeable of batteries and required precautions. Please read the following  
cautions before replacing the batteries. Keep unknowledgeable (i.e., unauthorized)  
personnel away from the batteries.  
CAUTION: Except for the battery, the unit contains no user serviceable parts. Repairs  
should be performed only by factory trained service personnel.  
CAUTION: A battery can present a risk of electrical shock and high short-circuit current.  
The following precautions should be observed when working on batteries:  
(1) Remove watches, rings, or other metal objects.  
(2) Use tools with insulated handles.  
CAUTION: Do not dispose of batteries in a fire. The batteries may explode.  
CAUTION: Do not open or mutilate batteries. They contain an electrolyte which is toxic  
and harmful to the skin and eyes.  
CAUTION: When replacing batteries, use the same number and the following type  
batteries: sealed Lead-Acid Maintenance Free (VS375C: 1x 12V3.5AH; VS575C: 1 x  
12V/3.8AH)  
 
VS375C/VS575C  
17  
6.2 Battery Replacement Procedure for VS375C/ VS575C  
Changing the batteries in your UPS is a safe and easy procedure. Since the battery is  
isolated from the AC input you may leave your UPS and computer or other equipment on  
during the following procedure. Please note that if you choose to leave the UPS on when  
the battery is removed, it will not be able to power your equipment if a power failure occurs.  
Please read the cautions in section 6.1 before performing the following steps.  
1. Remove the two small screws from the side of the UPS plastic case.  
2. Gently slide the battery plate off.  
3. Gently pull out the battery.  
4. Disconnect the two wires connecting the battery to the UPS.  
5. Connect the wires to the new battery, making sure that the red wire is connected to  
the red battery terminal and the black wire is connected to the black battery terminal.  
6. Push the new battery into place.  
7. Reposition the battery retaining plate.  
8. Tighten the two small screws on the bottom of the UPS plastic case.  
 
18  
VS375C/VS575C  
Fuse Replacement Procedure  
1. Use a slotted screwdriver to take out the fuse socket.  
2. Take out the broken fuse from the fuse socket.  
3. Throw away the broken fuse.  
4. Use the slotted screwdriver to push out the spare fuse.  
5. Put the spare fuse into the fuse socket.  
6. Push the fuse socket into the AC input socket.  
 

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