DongCheng DSA125/ASA125/KSA125 Operation Instructions

Important Safety Information

WARNING: Read all safety warnings, instructions, illustrations, and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire, and/or serious injury.

Save all warnings and instructions for future reference. The term "power tool" refers to your mains-operated (corded) or battery-operated (cordless) power tool.

Chemical Warnings

Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to cause cancer, birth defects, or other reproductive harm. Examples include:

• Lead from lead-based paints
• Crystalline silica from bricks and cement
• Arsenic and chromium from chemically treated lumber

To reduce exposure: work in a well-ventilated area and use approved safety equipment, such as dust masks designed for microscopic particles. For more information, visit www.P65Warnings.ca.gov.

General Safety Warnings

1. Work Area Safety

• Keep work area clean and well lit.
• Do not operate power tools in explosive atmospheres (e.g., presence of flammable liquids, gases, or dust). Power tools create sparks.
• Keep children and bystanders away. Distractions can cause loss of control.

2. Electrical Safety

• Power tool plugs must match the outlet. Do not modify plugs. Use appropriate earthed (grounded) outlets.
• Avoid body contact with earthed or grounded surfaces (pipes, radiators, appliances).
• Do not expose power tools to rain or wet conditions.
• Do not abuse the cord. Keep it away from heat, oil, sharp edges, or moving parts. Damaged or entangled cords increase shock risk.
• When operating outdoors, use an extension cord suitable for outdoor use.
• In damp locations, use a residual current device (RCD) protected supply.

3. Personal Safety

• Stay alert, use common sense. Do not use while tired or under the influence of drugs, alcohol, or medication.
• Use personal protective equipment (PPE): eye protection, dust mask, safety shoes, hard hat, hearing protection as appropriate.
• Prevent unintentional starting: ensure the switch is OFF before connecting power or battery, picking up, or carrying the tool.
• Remove any adjusting key or wrench before turning the tool on.
• Do not overreach. Maintain proper footing and balance for better control.
• Dress properly: no loose clothing or jewelry. Keep hair and clothing away from moving parts.
• If dust extraction facilities are provided, ensure they are connected and used properly.
• Do not let familiarity lead to complacency. Careless actions can cause severe injury.

Power Tool Use and Care

• Do not force the tool. Use the correct tool for the application.
• Do not use if the switch does not operate correctly.
• Disconnect power/battery before making adjustments, changing accessories, or storing.
• Store idle tools out of reach of children and untrained persons.
• Maintain tools and accessories. Check for misalignment, binding, or breakage. Repair if damaged.
• Keep cutting tools sharp and clean.
• Use the tool, accessories, and bits according to instructions, considering work conditions.
• Keep handles and gripping surfaces dry, clean, and free from oil/grease.

5. Service

Have your power tool serviced by a qualified repair person using only identical replacement parts.

VOLTAGE WARNING

Ensure the supplied voltage matches the machine's nameplate. Higher voltage can cause serious injury or damage. If in doubt, DO NOT PLUG IN. Lower voltage is harmful to the motor.

Additional Safety Rules for Sanding

• This tool is for sanding. Read all safety warnings and instructions.
• Not recommended for cutting operations.
• Do not use accessories not recommended or designed by other manufacturers.
• Accessory rated speed must not be less than the tool's maximum speed.
• Accessory diameter and thickness must be within the tool's rated capacity.
• Abrasive disc axle hole size must match the spindle.
• Do not use damaged accessories. Check for debris and cracks before use.
• If the tool falls, check for damage and replace the accessory if necessary. After installing an accessory, run the tool for 1 minute at no-load speed with bystanders at a safe distance.
• Wear appropriate PPE (mask, goggles, hearing protection, gloves, apron).
• Bystanders must maintain a safe distance and wear PPE.
• Keep flexible lines away from rotating parts.
• Do not lay down the tool until the accessory stops completely.
• Do not switch on the tool while carrying it.
• Clean air vents often.
• Do not operate near flammable materials.
• Do not use accessories requiring cooling liquid.

Further Safety Instructions for All Operations

• Hold the tool firmly with correct posture to resist bounce. Use auxiliary handle if provided.
• Never get close to rotating parts.
• Do not stand where the tool might move when bouncing.
• Be careful on sharp corners or edges to avoid accessory bounce or twining.
• Do not attach saw chains, blades, or saw blades with teeth.

SAVE THESE INSTRUCTIONS

WARNING! MISUSE or failure to follow safety rules may cause serious personal injury.

Description of Symbols

The rating plate may show symbols representing important information or instructions. Double insulation provides additional protection.

• WARNING: Read instruction manual to reduce injury risk.
• Always wear eye protection.
• Class II tool.

Technical Data

Intended Use

The machine is intended for dry sanding of wood, plastic, filler, and coated surfaces.

Instructions for Operation

Switch Operation

Caution: Always ensure the tool is switched OFF and unplugged before installing or removing the abrasive disc.

Switch Positions: 1: ON, 0: OFF

1. Before plugging in, check that the switch trigger returns to the "OFF" position.
2. For comfortable operation, the switch can be locked in the "1" (ON) position. Be careful and grip the tool firmly when locked.
3. To start, press the "1" side of the switch. To stop, press the "0" side.

Speed Control Dial

The rotation speed can be adjusted from 4000 to 12000/min. Higher speed is obtained by turning the dial towards "6"; lower speed by turning towards "1".

Installing or Removing the Abrasive Paper

1. To install abrasive paper, remove dirt/foreign matter from the pad. Align paper holes with pad holes and press firmly. Note: Removing abrasive paper reduces its adhesion; do not reapply.

Installing Dust Bag

1. Install the dust bag, inclining it upward.

Sanding Operation

1. Hold the tool firmly. Turn it on and apply it gently to the workpiece. This tool is generally for micro-grinding surfaces. Grinding quality is more important than quantity/speed. Do not apply excessive pressure. Keep the baseplate aligned with the workpiece. Placing a cloth under the tool can help achieve a high finish on furniture or delicate surfaces.

Cautions:

• Never block air vents with fingers or hands.
• Never run the tool without abrasive paper; this can damage the pad.
• This tool is not waterproof; do not use water on the workpiece.

Maintenance and Care

Caution: Always ensure the tool is switched OFF and unplugged before inspection or maintenance.

Check Mounting Screws

Always check that mounting screws are secure. Tighten any loose screws immediately.

Maintenance of the Motor

The motor winding is critical. Prevent damage and keep it dry. Do not expose to oil or water.

After Use

Do not put the tool down immediately after turning it off. Wait until it stops completely to avoid accidents and reduce dust intake.

Clean Air Vents

Keep air inlet and outlet clean. Clean regularly or when blocked.

Check Carbon Brushes

Check and replace carbon brushes regularly. Replace when worn to the limit mark. Keep them clean and free to slip. Replace both brushes simultaneously.

Replace Carbon Brushes

Use a screwdriver to remove the brush cover, replace worn brushes, and tighten the cover.

Replaceable Parts: Carbon Brush, Switch, Cord.

If the power cord is damaged, it must be replaced by the manufacturer or an authorized agent.

Parts List