Interacting with Co-workers / key Learning Outcomes

At the end of this module, you will be able to :

• List the work requirements 
• Maintain interpersonal skills 
• Evaluate non-biased feedback 
• Recognize different functions 
• Describe interpersonal and decision making skills 

Achieve Productivity and Quality as per Company's Norms

To achieve productivity and quality as per company standards, a technician should follow the working instructions given by the company. To achieve productivity and quality practice the following :

Diagnose
Diagnose the problem correctly 

Resolve 
Repair and show the working of the repaired unit
Suggest solution to the customer as per requirement
Resolve the customer's problem within stipulated time.

Take feedback 
Ensure 100% customer satisfaction with the service
Receive the signature of the customer on work completion from
Receive feedback from the customer

Confirmation of Functionality of the Repaired Module

Once the dysfunctional module has been repaired/replaced ,check the new module with testing equipment such as Multimeter and ammeter. This is done to ensure whether the module is working fine with the other parts of the microwave oven. After testing the unit is working properly or not. 

Repairing /Replacing of Dysfunctional Module in Microwave Oven

Sometimes only the connections of microwave oven needs to be checked and fixes. This can be done by a home appliance repair technician. But at times, a specialized technical help/support is required to repair internal circuits or fix a fault. If the first level maintenance cannot rectify a fault, then a trained technician is called. If even the trained technician cannot solve the issue, then a specialized technician associated with third - party or vendor is called.
In such a case,the specialized technician removes and replaces the faulty module with a functional unit, either on the second visit or as pre-identified.
In case even the specialized technicians are unable to repair the components or fix the fault,  or if the problem is such that cannot be fixed at customer's site, then the faulty module/component is sent to the service centre. The home appliance repair technician then collects the functional module from the service centre and fixes the microwave oven at the customer's site. 

Faults and Symptoms of Dysfunctional Microwave Oven

It is important to understand the symptoms of the dysfunctional microwave oven for identifying the faults in it. The following flowchart represents the faults along with their potential causes and solutions :           

• Problem 1 : Cavity lamp does not light and oven does not operate 
• 

• Problem 2 : Oven does not operate but cavity lamp lights 
  

• Problem 3 : Oven operate for a few minutes and stops/Oven operates and does not stops/Output power is too low when cook is selected /Output power is high when defrost is selected. 
  

• Problem 4 : No microwave instsllation

• Problem 5 : Fuse blows 

Understand the Symptoms and Identity the Fault

It is very import for a technician to identify the fault in the microwave oven. Wrong identification of fault will lead to waste of time and money and it can also causes damage to appliance. Some basic steps which need to be followed during fault identification are:

Diagnose the fault, based on customer interaction and initial inspection. 

⬇️

Disconnect the power source and check for voltage at the outlet. 

⬇️

Inspect the cord for any damage or burn marks. 

⬇️

Remove the outside she'll of the microwave. 

⬇️

Unscrew the screws underneath and on the back that hold the shell in place and slide it off. 

⬇️

Carry out basic tests such as power supply inspection, volt Ampere test and earth test.

⬇️

Separate and inspect every module of the unit if the fault is not identified through basic tests. 

⬇️

Place a probe on each component.  Check the reading. 

Repairing and Replacing of Faulty Modules

One of the common causes of malfunctioning of microwave oven is due to non-compliance of user manual instruction or using the appliance inappropriately. Some frequently occurring problems and their causes are given below :

1.
Problems :
Home fuse blows when a power cord is plugged into the wall receptacle

Causes :
Shorted power cord or wireless harness

2.
Problems :
Monitor fuse blows when harness power is applied.

Causes :
1.Shorted power cord or wireless harness
2.Secondary interlock or monitor switch

3.
Problems :
Nothing displays on the the display when powered is plugged in

Causes :
1.Shorted or open wiring
2.Monitor switch or monitor
3.Over temperature fuse
4.Control unit

4.
Problems :
No response after pressing STOP/CLEAR button.

Causes :
1.Primary interlock relay or door sensing switch

5.
Problems
Over lamp does not light with shorted or open wiring opened

Causes  :
1.Monitor fuse
2.Over temperature fuse door
3.Over lamp or socket
4.Control unit
5. Relay (RYI)

6.
Problems :
Over lamp does not light at all

Causes :
1.Shrted or open wiring
2.Over lamp or socket

7.
Problems :
Oven lamp lights, but fan motor and turntable motor do not operate

Causes :
1.Shorted or open wiring
2.Cooling fan motor
3.Turntable motor

8.
Problems :
Over does not go into cook cycle Shorted or open wiring when START button is touched

Causes :
1.Primary interlock system
2.Monitor fuse
3.Magnetron or oven temperature fuse
4.Relay (RYI)

9.
Problems  :
Oven is working but food is not getting heated up.

Causes
1.Shoryed or open wiring
2Agnetron
3.Power transformer
4.Rectifier assembly
5.H.V capacitor
6.Primary interlock system

10.
Problems :
Food is unevenly heated in the cook cycle.

Causes :
1.Shorted or open wiring
2.Turntable motor
3.Low voltage
4.Dirty oven cavity
5.Wrong operation

11.
Problems :
Cooking Power not working properly

Causes :
1.Shorted or open wiring
2.Control unit

12.
Problems :
Defrost function not working

Causes :
1.Magnetron
2.Wrong operation.
3.Low voltage
4.Dirty oven

13.
Problems :
The oven is in the sensor cooking condition but AH sensor condition but AH sensor does not end or AH sensor turns off about off about a maximum of 30 minutes after start.  When a cup of water is heated by sensor, the oven does not shut off when the water is boiling. (This happens in few models)

Causes :
1. Control Unit
2.AH Sensor