ACTIVITY 5

TOPIC: BLENDER/MIXER
OBJECTIVES:
1.

To familiarize yourself with the operation and control panel of the blender/mixer

2.

To state the functions of each control of the blender/mixer

3.

To measure the resistance readings of the blender/mixer heating elements

4.

To open and expose each component in the blender/mixer

5.

To familiarize yourself with each component of the blender/mixer

6.

To state the function of each component of the blender/mixer

7.

To sketch and label the pictorial view of the blender/mixer

8.

To draw the schematic diagram of the blender/mixer circuit

Figure 1: Blender/Mixer

TOOLS AND EQUIPMENT USED

1.

Multimeter

2.

Megger ohmmeter

3.

Test pen

4.

Phillip and star screw driver set

5.

Long nose plier

6.

Diagonal cutter

PROCEDURE
1.

The service manual provided was referred and the blender/mixer was operated.

2.

The specification label was located and read, and then the information was recorded
in Table 1.
Brand:

SUNMAX

Model No:

SM-503B

Voltage:

240V

Frequency:

50Hz

Power:

300W
Table 1: Specification of blender/mixer

3.

The front panel of the blender/mixer was observed and the observation was recorded
in the report especially the control knob of the blender/mixer.

4.

An appropriate tool, the back cover of the blender/mixer unit was open up and the
electrical connection of the blendr/mixer was observed. The block diagram and the
possible circuit diagram of the blender/mixer were drawing in the spaces provided.

POWER
SUPPLY
240V

SWITCH

GRINDERS

OUTPUT/
READY TO USE

Figure 2: Block Diagram of the Electrical Connection of the blender/mixer

Figure 3: Circuit Diagram of the Electrical Connection of the blender/mixer

5.

Power supply plug of the blender/mixer was removed from the 240 Volt AC main
supply socket.

6.

An appropriate tool was used, the back cover of the blender/mixer was open up and
the electrical connection of the blender/mixer electrical system was observed.

7.

The power plugs were not connected to the main supply socket. The work was doing
with the power OFF.

8.

The multimeter or megger ohmmeter was used, the insulation resistance and short
circuit tests of the L (live), N (neutral), E (earth) connection of the supply cables were
doing. The reading was recorded in the Table 2.
Wires

Insulation Test (OHM)

Short Circuit Test (OHM)

L and N
L and E
N and E

Table 2: Insulation and Short Circuit Tests

9.

An each component in the blender/mixer compartment was dismantled and the

labelled exploded view of the circuit showing the correct connection of the

blender/mixer electrical circuit was draw. For the convenience, the service manual
was referred.
10.

The component was identified and the function of each component was written down
in Table 3.
Components

Functions

Screw

As connector the iron

Power supply cord

To give the power supply 240v

motor

Blender can function

Bottom Cover

House motor and electronics

Circuit Board

Motor power and speed control

Button Bracket

Support speed control buttons

Speed Control Buttons

User interface to select blender speed

Top Cover

House motor and electronics

Lid

Cover top of jar

Jar

Contain materials to be blended

Blade Assembly

Blend materials through mechanical

action
Hold blade assembly and gasket and
secure them to bottom of jar
Transmits rotation of motor shaft to blade
shaft.

Bottom Cap
Blade Turner

Table 3: The function of each component

11.

A multimeter was used, a continuity and resistance tests to the heating element was
doing and the reading was recorded in the Table 4.
Points

Ohmmage Reading

Body to L terminal

L to N terminal

Body to N terminal

Table 4: Continuity and Resistance Test

12.

The common problem of the Iron was stated. The possible causes also stated and the
idea was suggested to solve the problems.

Problem

Possible Causes

Solutions

Expose electronics and

sharp metal fan

Bottom cover screws

loosening

Screw the bottom back

Moving blender during

usage, possible falling if
near edge
Electrocution of user

Missing rubber 'feet' on

bottom cover

Hold blender during

usage

Missing insulation, frayed

wiring on electrical cord

Swap out electrical

cord if possible

Discomfort when
pressing metal where the
button used to be
Unusable blender due to
lack of container

Speed control buttons

getting removed and lost

Cracking/breaking the jar

Cover metal where

button used to be with
lots of tape
Replace with new jar

Table 5: Problem, causes and solutions

13. Any defective component was replaced, and the component was reassembling back to
normal. After that, the instructor was checking the work

14. The blender/mixer was tested and the safety aspects were not forgotten.

LABELED EXPLODED VIEWS

5
6

LABELED PART:

1.
2.
3.
4.
5.
6.

Lid
Jar
Handle
Blade
Jar base and jar housing
Multispeed switch

COMPONENT VIEW PART

Blade Turner

Speed Control Buttons

Motor

Circuit Board

QUESTIONS

1.

What are the effects of the line frequency (50 Hz) to the operation of the
blender/mixer?
Iron operating at 50Hz because most electronic equipment in Malaysia is set to a
frequency of 50Hz. This line frequency is a most efficient for the 240 volt that supply
for domestic uses.

2.

How does a megger ohmmeter help your to decide that the blender/mixer is safe
to use?
Megger ohmmeter is used to apply the insulation and short circuit tests on the
connection of the supply cable to trace that the iron in safe condition. After done the
testing the result must show that for a good condition reading is not less than 1M for
the every connection of phase(L and N),(L and E),(N and E).

3.

What is the importance of the specification information of the blender/mixer?

The specification information of the blender/mixer is important because its telling us
how much the power is supplied.

4.

How does a blender/mixer work?

A blender consists of housing, motor, blades, and food container. A fan-cooled
electric motor is secured into the housing by way of vibration dampers, and a small
output shaft penetrates the upper housing and meshes with the blade assembly.
Usually, a small rubber washer provides a seal around the output shaft to prevent
liquid from entering the motor. Most blenders today have multiple speeds. As a
typical blender has no gearbox, the multiple speeds are often implemented using a
universal motor with multiple stator windings and/or multitapped stator windings; in a
blender with electromechanical controls, the button (or other electrical switching
device or position) for each different speed connects a different stator winding/tap or
combination thereof. Each different combination of energized windings produces a
different torque from the motor, which yields a different equilibrium speed in balance
against the drag (resistance to rotation) of the blade assembly in contact with the
material inside the food container.

DISCUSSIONS

At the end of practice, we can identify some of the damage that occurs in a
blender/mixer such as blender expose electronics and sharp metal fan, this is causes by
bottom cover screws loosening. Next, the blender/mixer moving during usage; possible
falling if near edge and the blender/mixer electrocution of user, this is causes by missing
rubber 'feet' on bottom cover and missing insulation, frayed wiring on electrical cord. Other
than that, the problem is blender was discomfort when pressing metal where the button used to
be and unusable blender due to lack of container. So for the solution that blender expose
electronics is we can screw the bottom back. Then for the blender moving during usage and
electrocution of user, the solution is hold blender during usage and swap out electrical cord if
possible. For the last problem that blender discomfort when pressing metal where the button
used to be and unusable blender due to lack of container, we can cover metal where button
used to be with lots of tape and replace blender with new jar.

CONCLUSION
As a conclusion, after we had done doing the experiment, we know the operation of
the blender/mixer. We also know how to open all the part in the blender/mixer and we can
detect

the

part

that

is

always

problem

and

broken.

The

blender/mixer

is

a kitchen and laboratory appliance used to mix, puree, or emulsify food and other substances.
The example of damage is blender expose electronics and sharp metal fan, the blender/mixer
moving during usage; possible falling if near edge and the blender/mixer electrocution of
user. Other than that, the damage is blender was discomfort when pressing metal where the
button used to be and unusable blender due to lack of container. If the damage is not serious,
we can repair.
Besides that, we also learn about how the parts work together in blender. A blender
consists of housing, motor, blades, and food container. A fan-cooled electric motor is secured
into the housing by way of vibration dampers, and a small output shaft penetrates the upper
housing and meshes with the blade assembly. Usually, a small rubber washer provides a seal
around the output shaft to prevent liquid from entering the motor. Most blenders today have
multiple speeds. As a typical blender has no gearbox, the multiple speeds are often
implemented using a universal motor with multiple stator windings and/or multitapped stator
windings; in a blender with electromechanical controls, the button (or other electrical
switching device or position) for each different speed connects a different stator winding/tap
or combination thereof. Each different combination of energized windings produces a
different torque from the motor, which yields a different equilibrium speed in balance against
the drag (resistance to rotation) of the blade assembly in contact with the material inside the
food container.
We also know the important reason we need to learn the ways to repair our electronic
component. That is because in our daily, we are used many things that is related to the
component electronic. Furthermore, we can practice the knowledge that we learned about this
blender/mixer to repair our broken blender/mixer at home especially if the damaged part is
just a little and easy to repair.

REFERENCES
1. http://best-price-blender-for-sale.ottawadjfest.com/tag/black-decker-blender-parts
2. http://home.howstuffworks.com/blender.htm
3. http://wiki.ece.cmu.edu/ddl/index.php/Blender_2

ATTACHMENTS