Laptop Repair Best Dc power supply | 3 or 4 digit dc laptop power supply | Bangla

Laptop Repair Best Dc power supply | 3 or 4 digit dc laptop power supply | Bangla
#Dc_Laptop_Repair_PowerSupply#30v_5A_Latest_PowerSupply
1. Introduction
To all residents of the European Union Important environmental information about this productThis symbol on the device or the package indicates that disposal of the device after its lifecycle could harm the environment. Do not dispose of the unit (or batteries) as unsorted municipal waste; it should be taken to a specialized company for recycling. This device should be returned to your distributor or to a local recycling service. Respect the local environmental rules. If in doubt, contact your local waste disposal authorities. Thank you for choosingVelleman! Please read the manual thoroughly before bringing this device into service if the device was damaged in transit, don’t install or use it and contact your dealer.
2. General Guidelines
• Familiarize yourself with the functions of the device before actually using it.
• All modifications of the device are forbidden for safety reasons. Damage caused by user modifications to the device is not covered by the warranty.
• Only use the device for its intended purpose. Using the device in an unauthorized way will void the warranty.
• Damage caused by disregard of certain guidelines in this manual is not covered by the warranty and the dealer will not accept responsibility for any ensuing defects or problems.
• Keep this manual for future reference.
3. Features
• dual LED display for voltage and current
• coarse and fine adjustments of voltage and current
• protection mode: current limiting
• output connectors: insulated safety plugs
• organic glass front panel / other panels made of steel
• memory:3 programmable memories
• computer connectivity: pc remote control via USB
• software included for Windows XP, Vista and W7, W8, W8.1 (32 bits + 64 bits)
4. Description
The QJ3005P is a highly accurate, DC-regulated power supply with an adjustable output. This output can be used for constant voltage (C.V.) and constant current (C.C.).
The output voltage can be adjusted between 0V and 30V when the device is in the constant voltage mode. The current-limiting point can be set arbitrarily in this mode.
The output current can be adjusted continuously between 0A and 5A in the constant current mode. The output current and voltage are indicated on the LED displays.
5. Operation
Using the Power Supply in Constant Voltage Mode
If you want to use the power supply in constant voltage mode, you set up the desired output voltage between 0V and 30V. You also set up the desired current limit.
If the output current exceeds the limit, the power supply automatically goes into the constant current mode.
Using the Power Supply in Constant Current Mode
If you want to use the power supply in constant current mode: you set up the desired output current between 0A and 5A. You also set up the desired voltage limit. Setting Voltage and Current
You can save 3 different voltage/current settings using the memory keys M1~M3.
1. Press the Voltage/Current key [5] to set the voltage. The voltage readout flashes.
For use in constant voltage mode: this is the desired constant voltage.
2. Turn the adjustment knob [11] until you reach approximately the desired voltage. Press [11] to select a digit in the voltage readout [9] and turn the Adjustmentknob to fine-tune.
3. Press the Voltage/Current key [5] again to set the current. The current readout flashes.
For use in constant voltage mode: this is the desired current limit.
For use in constant current mode: this is the desired constant

6. Protection
Using Overcurrent Protection
• To protect against overcurrent, set up the maximum current and then press the OCP button.
• Press Off/On to apply the output to the load.
If the output current becomes higher than the set value, the power supply cuts off the output and the OCP indicator flashes.
• Disconnect the load. To recover, press the OCP key.
7. Remote Control via PC
To operate the power supply via the included pc software, proceed as follows:
1. Install the software on your pc and launch the software.
2. Connect the power supply to the pc via the USB [17] port and switch it on.
Note: the keys on the front panel are locked when the power supply is connected to a pc. You can only operate the power supply via the pc. The LED display and indicators work normally.
3. Click the shortcut icon to launch the software. The opening screen appears.

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