R216LS

CHAPTER 7. TROUBLESHOOTING GUIDE

Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.

When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the "Test Procedure "section.

IMPORTANT:

If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, primary interlock relay (RY2), door sensing switch and secondary interlock switch before replacing the monitor fuse. If monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS- BA026WRKZ or FFS-BA038WRKZ as an assembly.

IMPORTANT:

Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases, be necessary to connect the power supply cord after the outer case has been removed, in this event,

1)Disconnect the power supply cord, and then remove outer case.

2)Open the door and block it open.

3)Discharge high voltage capacitor.

4)Disconnect the leads to the primary of the power transformer.

5)Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.

6)After that procedure, reconnect the power supply cord. When the testing is completed,

1)Disconnect the power supply cord, and then remove outer case.

2)Open the door and block it open.

3)Discharge high voltage capacitor.

4)Reconnect the leads to the primary of the power transformer.

5)Reinstall the outer case (cabinet).

6)Reconnect the power supply cord after the outer case is installed.

7)Run the oven and check all functions.

[1] TROUBLESHOOTING CHART

TTEST PROCEDURE

POSSIBLE CASE

AND DEFECTIVE PARTS

CONDITION

PROBLEM

 

Home fuse blows when power cord is plugged

 

into wall receptacle.

 

Monitor fuse blows when power cord is plugged

 

into wall receptacle.

OFF

Any letters or indicators do not appear in display

CONDITION

when power cord is first plugged into wall outlet.

 

D i s p l a y d o e s n o t o p e r a t e p r o p e r l y w h e n

 

STOP/CLEAR key is touched. (Buzzer should

 

sound and time of day should appear in display.)

 

Monitor fuse blows when the door is opened.

 

Fan motor does not operate. (All other electric

 

components function.)

 

Oven lamp does not light at all. (All other electric

 

components function.)

 

Turntable motor does not operate. (All other

 

electric components function.)

 

Oven does not go into cook cycle when START

 

pad is touched

 

Oven seems to be operating but little or no heat

COOKING

is produced in oven load. (Food incompletely

CONDITION

cooked or not cooked at all at end of cook cycle.)

 

 

O v e n g o e s i n t o a c o o k c y c l e b u t e x t r e m e l y

 

uneven heating is produced in oven load (food).

 

Oven does not cook properly when programmed

 

for Cooking 50% mode. (Operates properly on

 

Cooking Power 100% mode.)

 

Oven lamp, turntable motor and fan motor do not

 

operate.

 

O v e n g o e s i n t o D E F R O S T b u t f o o d i s n o t

 

defrosted well.

 

 

RE CK

IN POWER CORD

OR OPENED WIRING

SHORT

SHORT

A

MAGNETRON

B

POWER TRANSFORMER

C

H.V. RECTIFIER ASSEMBLY

D

HIGH VOLTAGE CAPACITOR

E

or TEMPERATURETHERMAL -CUT (OVEN)FUSE (OVEN)OUT

F

PRIMARY INTERLOCK SYSTEM

F

SECONDARY INTERLOCK SWIT

G

MONITOR SWITCH

H RE RE CK J/L CK CK CK

MONITOR FUSE

OVEN LAMP

COOLING FAN MOTOR

TURNTABLE MOTOR

CONTROL UNIT or RELAY

WRONG OPERATION

LOW VOLTAGE

DIRTY OVEN CAVITY

K

KEY UNIT (MEMBRAINE SWITCH

N

FOIL PATTERN ON PWB.

M

DEFROST

I

NOISE FILTER

7 – 1

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Sharp R-216LS service manual Troubleshooting Guide, Troubleshooting Chart

R-216LS specifications

The Sharp R-216LS is a versatile microwave oven that combines affordability with a range of features designed to enhance your cooking experience. Compact yet powerful, this model is especially suitable for small kitchens or dorm rooms, where space is at a premium.

One of the standout features of the Sharp R-216LS is its impressive 800 watts of cooking power. This ensures quick and efficient heating, allowing users to prepare meals in a fraction of the time compared to conventional ovens. The microwave also features a variety of power levels, providing flexibility for different types of cooking and reheating tasks, from defrosting frozen food to cooking delicate items like baked goods.

The R-216LS comes equipped with a spacious 20-liter capacity, which is surprisingly roomy for its size. This allows for ample space to heat up large dishes or multiple servings at once. The interior is designed with easy cleaning in mind, featuring a non-stick coating that prevents food from adhering to the surfaces and simplifies maintenance.

In terms of usability, the Sharp R-216LS boasts a user-friendly interface with straightforward knobs and buttons. It includes a timer and a range of pre-programmed cooking options, enabling users to cook a variety of foods with just the touch of a button. This is particularly beneficial for those new to microwave cooking or for busy individuals looking to save time.

The microwave also incorporates advanced technologies, including inverter microwave technology, which provides a continuous stream of cooking power for more even heating and defrosting. This ensures that your food is cooked thoroughly without the risk of hot and cold spots.

Safety is another priority in the design of the R-216LS. It features a child safety lock, which prevents accidental operation, making it a perfect choice for families with young children. The model also has an automatic shut-off feature, ensuring that the microwave turns off when not in use.

In summary, the Sharp R-216LS is a compact microwave that offers a blend of power, convenience, and safety features, making it an excellent choice for anyone seeking a reliable cooking appliance. Whether for reheating leftovers, cooking meals, or defrosting ingredients, this microwave is designed to meet the diverse needs of modern kitchens. With its combination of thoughtful design and functionality, the R-216LS stands out as a worthy investment for those looking for efficiency and performance in their cooking appliances.