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    Parts of The Analog Multitester

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    Destiny canacan
    The document describes the main parts of an analog multitester including the pointer, scale, dial/infinity knob, zero ohm adjuster, range selector knob, range, and test probes. It lists the functions of a multitester/VOM as measuring voltage, resistance, and current. It then provides descriptions of parts of a washing machine like the top cover, pulsator, drain hose, side cover tub, drum, water supply hose, and tub. Next, it includes a block diagram of an electronically controlled washing machine showing components like the power controller, sensor, program selection control, comparator, motor, input command, AC plug, and drive belt.

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    © All Rights Reserved
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    Parts of The Analog Multitester

    Uploaded by

    Destiny canacan
    139 views4 pages
    The document describes the main parts of an analog multitester including the pointer, scale, dial/infinity knob, zero ohm adjuster, range selector knob, range, and test probes. It lists the functions of a multitester/VOM as measuring voltage, resistance, and current. It then provides descriptions of parts of a washing machine like the top cover, pulsator, drain hose, side cover tub, drum, water supply hose, and tub. Next, it includes a block diagram of an electronically controlled washing machine showing components like the power controller, sensor, program selection control, comparator, motor, input command, AC plug, and drive belt.

    Original Description:

    Original Title

    PARTS OF THE ANALOG MULTITESTER Pointer or Needle – indicates the values read from the scale Scale – shows the value of what is being measured DialInfinity Knob – points the needle to the 0 at the left side o (1)

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    The document describes the main parts of an analog multitester including the pointer, scale, dial/infinity knob, zero ohm adjuster, range selector knob, range, and test probes. It lists the functions of a multitester/VOM as measuring voltage, resistance, and current. It then provides descriptions of parts of a washing machine like the top cover, pulsator, drain hose, side cover tub, drum, water supply hose, and tub. Next, it includes a block diagram of an electronically controlled washing machine showing components like the power controller, sensor, program selection control, comparator, motor, input command, AC plug, and drive belt.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    139 views4 pages

    Parts of The Analog Multitester

    Uploaded by

    Destiny canacan
    The document describes the main parts of an analog multitester including the pointer, scale, dial/infinity knob, zero ohm adjuster, range selector knob, range, and test probes. It lists the functions of a multitester/VOM as measuring voltage, resistance, and current. It then provides descriptions of parts of a washing machine like the top cover, pulsator, drain hose, side cover tub, drum, water supply hose, and tub. Next, it includes a block diagram of an electronically controlled washing machine showing components like the power controller, sensor, program selection control, comparator, motor, input command, AC plug, and drive belt.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4
    At a glance
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    The key takeaways are about the parts and functions of a multitester and washing machine as well as safety procedures when working with electrical and electronic devices.

    The main parts of a multitester are the pointer or needle, scale, dial/infinity knob, zero ohm adjuster, range selector knob, range, and test probes.

    The functions of a washing machine are washing, rinsing and spinning clothes with the help of water and detergent. Its main parts include the top cover, pulsator, drain hose, side cover, tub, water supply hose and drum.

    Reviewer in T.L.E.

    PARTS OF THE ANALOG MULTITESTER

    Pointer or Needle – indicates the values read from the scale

    Scale – shows the value of what is being measured

    Dial/Infinity Knob – points the needle to the 0 at the left side of the scale

    Zero Ohm Adjuster – adjusts the needle to the right side of the scale

    Range Selector Knob – allows changing the function and scale

    Range – values written on multitester

    Test Probes – Positive probe (red) and Negative Probe (black) are used to
    connect to the circuit or device under test.

    Function of Multitester/VOM

    VOLTMETER - measures voltage (v)


    OHMETER - measures resistance ( )
    MILLIAMMETER - measures small amount of current (A)

    WASHING MACHINE
    -is a domestic appliance that washes clothes with the aid of water and detergent.

    Functions of each part


    Top Cover is used to cover the tub.
    Pulsator is a rotating part inside the tub and responsible in making the water spin.
    Drain Hose is an outlet serves as a passage way out for water after spinning has been done.
    Side Cover Tub is the main casing/housing for the parts of the unit.
    Drum serves as a washing tub.
    Water Supply Hose is an inlet of water.
    Tub is a drum-like component in which water, clothes and soap are put together prior to
    washing/spinning.

    Block Diagram of Electronically-Controlled Washing Machine

    Power Controller- is a circuit that controls the amount of power


    supplied to the motor.
    Sensor- is an input receiver that detects input signal coming from
    forward and reverse motor.
    Program Selection Control - is a set of push button switch that set the
    operation required of the washing machine.
    Comparator- is a processing circuit that accepts the input signal
    coming from sensor and program selection control.
    Forward/Reverse Motor- is an electric machine which changes
    applied electrical energy or power into mechanical output energy or
    power.
    Input Command - is a setting period of the user.
    AC Plug- is a connector intended for connecting the unit to the main
    power source of 220V.
    Drive Belt - is used to transmit mechanical energy from a driving
    pulley to a drive pulley.
    Buzzer- is an audio/ sound signal device to confirm or indicate that
    task programmed or set is done or a problem occurred.
    Symptoms of Washing Machine

    TYPES OF PERSONAL PROTECTIVE EQUIPMENT

    Personal Protective Equipment (PPE) is defined in the


    Occupational Safety and Health Administration (OSHA) as
    a tool used to protect workers from injury or illness
    caused by having contact with the dangers
    (hazards)theworkplace, whether they are chemical,
    biological, radiation, physical, electrical, mechanical and
    other.
    OCCUPATIONAL HEALTH AND SAFETY POLICIES AND PROCEDURE

    Occupational Health and Safety (OHS) is a cross-disciplinary area


    concerned with protecting the safety, health and welfare of people engaged

    in work. The goal is to promote a safe work environment. It may also protect
    co-workers, family members, employers, customers, suppliers, nearby
    communities, and other members of the public who are impacted by the workplace
    environment.
    As Consumer Electronic Servicing National Certificate Level II (CES
    NC II) student, you should know how to conduct yourself when working in
    the classroom/ laboratory room, as well as implement a safe way of
    accomplishing every task. Safety practices should be learned early and
    always adhered to when working with any electrical and electronic device.
    This is for your protection as well as of the people working with you, and
    also for the devices that you are using. The basis for this process begins
    with Occupational Health and Safety Policies.

    PERSONAL SAFETY WHILE WORKING ALONG ELECTRONIC CIRCUITS

    Electronics equipment can be dangerous, and you or others can be


    injured or even killed if you don’t follow proper safety guidelines when
    working or servicing these circuits. The following are some precautionary
    measures to take before working with any electrical/ electronic circuits:

    Wear shoes with non-conductive rubber soles to help reduce the


    chance of being shocked or seriously injured in an electrical accident.
    Do not work on components that are plugged into their power source.
    Do not remove expansion cards from electronic product when it is
    turned on.
    Remove jewelries when working inside any electronic related
    equipment.
    Be sure not to merge electronic components and water.
    COMPONENT REPLACEMENT:
    PROCEDURE:
    1. Identify the defective components.
    2. Determine the description of the values.
    3.Identify where to get the components.
    4. Select the parts as your replacement.
    Quality. The ability to provide exact value or specification to replacement part
    Tolerance. The ability to provide exact value or acceptable parameters to replacement parts.
    Availability. The local access to parts and whether the parts are available.
    Price. Refers to the affordability of the replacement parts at a reasonable price.
    5. Double check the testing procedure.
    6.Consider the original orientation.
    7.Check the nearby components.
    8.Install correctly the replacement part.
    9. Observe safety at all times.

    STEPS IN TROUBLESHOOTING:

    1. Conduct a quick diagnosis of the trouble.


    2. Do not remove the IC
    3.Consider voltage measurement on components.
    4. If the trouble symptom is caused by aging components, the defective component is usually one of them. However, in
    high-power-handling circuits, a defective component may cause other components to malfunction.
    5. Be familiar with the usual defects of components.
    6. Don’t replace an opened fuse
    7. Always suspect a faulty contact.
    8. When measuring resistance,make sure that the circuit is OFF.
    9. Set the VOM to a high resistance.
    10. Use soldering irons with the proper power rating.
    11. Use proper tools and soldering aids when troubleshooting PCB.
    12.Clean the leads.
    13. USE Personal Protective Equipment.

    Maintenance of Washing Machine


    STEPS :

    1. Turn off the washing machine and remove the cord from the source of voltage.
    2. Apply lubricant to mechanical parts of the washing machine that requires lubrication through a drop of oil or grease
    to assure smooth operation without grinding or squeaks.
    3. Replace the bushings or end bells for squeaks with the use of appropriate tools if squeaks cannot be corrected by
    applying lubricants.
    4. Apply or spray anti-rust lubricants to all mechanical parts of the washing machine to drive out moisture, protect
    corrosion, loosen rusted metal parts and even frees sticky mechanism.
    5. Clean and check cooling louvers for any obstructions to avoid cutting off the air flow.
    6. Clean or wipe dust and foreign particles at the PC Board and metal parts of the motor.
    7. Replace worn or frayed AC cord and electrical wires.

    CLEANING INSTRUCTIONS
    STEPS :

    1. Use mild soap and damp cloth or rug when cleaning plastic front panel
    and cover. They are susceptible to immediate and long term damage from
    solvents.
    662. Apply denatured alcohol as the safest solvent to use for plastic front
    panel and cover with heavy stain. It should be used only as a last resort
    and apply to areas with heavy stain.
    Procedure in Repairing a Washing Machine
    1. Once the specific electrical/mechanical problem is located:
    consider the techniques for the proper removal of the defective
    component or parts;
    anticipate what to do if the replacement part does not correct
    the problem;
    and check the installation of the replacement or original part
    for any improper mounting in the mechanical assembly or
    circuit board.
    2. Examine carefully the mounting of the replacement of original parts of the system.
    3. Check the placement of the wires or leads of the replacement component
    4. Consider significant factors used in the original installation such as insulating washer, silicon grease and locating mark
    for pin connections.
    5. Observe proper placement of the component leads for electrical parts.
    6. Perform the techniques for the proper soldering of electrical parts. Be careful not to damage adjacent components.
    7. Be careful not to lift the copper conductive path from circuit board base material.
    8. Avoid any solder bridges between board paths.
    9. Do not destroy the component being removed in case it is still functional and be careful not to damage the component
    being installed.
    10. Verify all connections and harnesses. 11. Be sure that all components are pre-positioned in a manner that will avoid
    thepossibility of having adjacent components short circuited. 12. Be sure to check or inspect all insulators and barriers
    between sections after working on any model/brand of washing machine. 13. Check for frayed or broken insulation on all
    wiring including the AC line cord.
    14. Be sure to replace fuses, resistors and capacitors with special designation such as flame proof to components equal
    to the original value for both safety and liability purposes.
    15. Once the repair is completed, perform an AC leakage test on all exposed metal parts of a washing machine to
    eliminate the possiblity of electric shock.
    16. Perform complete retesting of the washing machine to ensure the correctness of the actual repair.
    17. Connect the washing machine into the 60Hz power to allow the time period required to let the new parts settle in and
    operate as they are designed to work with each other
    18. Recheck or inspect if the repair was done correctly and the unit functions properly to ensure successful completion
    of the repair.

    19. Clean the washing machine before returning it to the customer.


    20. Be sure that the drum, pulsator, side cover tub and top cover of the washing machine are properly cleaned.
    21. Be sure to properly clean the control panel or switch box to ensure safe

    HAZARD AND RISK


    Hazard is a term used to describe something that has the potential to cause harm.
    Risk is a situation involving exposure to danger.

    TYPES OF HAZARD

    SAFETY HAZARD
    These are caused by inadequate and insufficient machine guards unsafe workplace condition and unsafe
    work practices.
    BIOLOGICAL HAZARD
    These are caused by organism such as viruses bacteria fungi and parasites
    PHYSICAL HAZARD
    These are caused by noise vibration energy weather electricity radiation and pressure
    CHEMICAL HAZARD
    This includes solid liquid vapor or gaseous chemicals does fumes and mists
    PSYCHOLOGICAL HAZARD
    These are those that basically cause forester workers these kind of hazard that that is general well-being
    is affected
    MECHANICAL/ELECTRICAL HAZARD
    This includes electricity machinery equipment pressure vessels and dangerous goods forklifts cranes and
    hoists
    ERGONOMIC HAZARD
    These are caused by anatomical psychological and psychological demands on the workers

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