Sharp R-27STM Service Manual ▷ View online
R-27STM
1
CONTENTS
BEFORE SERVICING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2
WARNING TO SERVICE PERSONNEL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3
PRODUCT SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
APPEARANCE VIEW - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
OPERATION SEQUENCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5
FUNCTION OF IMPORTANT COMPONENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6
TROUBLESHOOTING GUIDE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7
TEST PROCEDURES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
TOUCH CONTROL PANEL ASSEMBLY - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
PRECAUTIONS FOR USING LEAD -FREE SOLDER - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14
MICROWAVE MEASUREMENT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
CIRCUIT DIAGRAMS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20
PARTS LIST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 24
SERVICE MANUAL
No. S0801R27STPKS
MICROWAVE OVEN
MODEL
R-27STM
In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified
should be used.
should be used.
PCS
KG
TURN
STIR
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R-27STM
BEFORE SERVICING
GENERAL IMPORTANT INFORMATION
This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information.
It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory
customer service.
It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory
customer service.
WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:
GREEN -AND -YELLOW - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - EARTH
BLUE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - NEUTRAL
BROWN - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -LIVE
CAUTION MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CON -
DUCTING MICROWAVE ENERGY.
DUCTING MICROWAVE ENERGY.
Service engineers should not be exposed to the microwave energy which may radiate from the magnetron or other
microwave generating devices if it is improperly used or connected. All input and output microwave connections,
microwave generating devices if it is improperly used or connected. All input and output microwave connections,
waveguides, flanges and gaskets must be secured. Never operate the device without a microwave energy absorbing
load attached. Never look into an open waveguide or antenna while the device is energized.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained service engineers.
All the parts marked "∆" on parts list are used at voltage more than 250V.
Removal of the outer wrap gives access to potential above 250V.
All the parts marked "*" on parts list may cause undue microwave exposure, by themselves, or when they are damaged,
loosened or removed.
Servicing and repair work must be carried out only by trained service engineers.
All the parts marked "∆" on parts list are used at voltage more than 250V.
Removal of the outer wrap gives access to potential above 250V.
All the parts marked "*" on parts list may cause undue microwave exposure, by themselves, or when they are damaged,
loosened or removed.
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R-27STM
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WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the high voltage circuit
will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage fuse,
High voltage harness.
will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage fuse,
High voltage harness.
REMEMBER TO CHECK 3D
Disconnect the supply.
Door opened, and wedged open.
Discharge the high voltage capacitor.
WARNING: AGAINST THE CHARGE OF THE HIGH-VOLT-
AGE CAPACITOR
The high-voltage capacitor remains charged about 60
seconds after the oven has been switched off. Wait for
60 seconds and then short-circuit the connection of the
high-voltage capacitor (that is, of the connecting lead of
the high-voltage rectifier) against the chassis with the
use of an insulated screwdriver.
Sharp recommend that wherever possible fault-finding is car -
ried out with the supply disconnected. It may, in some cases,
be necessary to connect the supply after the outer case has
been removed, in this event carry out 3D checks and then
disconnect the leads to the primary of the power transformer.
Ensure that these leads remain isolated from other compo -
nents and the oven chassis. (Use insulation tape if neces -
sary.) When the testing is completed, carry out 3D checks and
reconnect the leads to the primary of the power transformer.
seconds after the oven has been switched off. Wait for
60 seconds and then short-circuit the connection of the
high-voltage capacitor (that is, of the connecting lead of
the high-voltage rectifier) against the chassis with the
use of an insulated screwdriver.
Sharp recommend that wherever possible fault-finding is car -
ried out with the supply disconnected. It may, in some cases,
be necessary to connect the supply after the outer case has
been removed, in this event carry out 3D checks and then
disconnect the leads to the primary of the power transformer.
Ensure that these leads remain isolated from other compo -
nents and the oven chassis. (Use insulation tape if neces -
sary.) When the testing is completed, carry out 3D checks and
reconnect the leads to the primary of the power transformer.
REMEMBER TO CHECK 4R
Reconnect all leads removed from components during testing.
Replace the outer case (cabinet).
Reconnect the supply.
Run the oven. Check all functions.
Run the oven. Check all functions.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup of
cold water on the oven turntable, close the door and set the
power level to HIGH (100%). And set the microwave timer for
two (2) minutes. When the two minutes has elapsed (timer at
zero) carefully check that the water is now hot. If the water re -
presence of microwave energy within a cavity, place a cup of
cold water on the oven turntable, close the door and set the
power level to HIGH (100%). And set the microwave timer for
two (2) minutes. When the two minutes has elapsed (timer at
zero) carefully check that the water is now hot. If the water re -
mains cold, carry out 3D checks and re-examine the connec -
tions to the component being tested.
tions to the component being tested.
When all service work is completed and the oven is fully assembled, the microwave power output should be checked and microwave
leakage test should be carried out.
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R-27STM
NOTE: Internal capacity is calculated by measuring maximum width, depth
and height. Actual capacity for holding food is less.
15
14
11
12
13
6
2
1
9
10
7
3
4
8
5
4
PRODUCT SPECIFICATIONS
ITEM
DESCRIPTION
Power Requirements
230 - 240 Volts
50 Hertz
Single phase, 3 wire earthed
Single phase, 3 wire earthed
Power Consumption
1.22 kW
Power Output
800 watts nominal of RF microwave energy (IEC60705 Test Procedure)
Operating frequency 2450 MHz
Outside Dimensions
Width 460 mm
Height 275 mm including foot
Depth 370 mm
Height 275 mm including foot
Depth 370 mm
Cooking Cavity Dimensions
Width 319 mm
Height 215 mm
Depth 336 mm
Height 215 mm
Depth 336 mm
Turntable diameter
272 mm
Control Complement
Touch Control System
Timer (0 - 99 minutes 90 seconds)
Timer (0 - 99 minutes 90 seconds)
Clock (1:00 - 12:59) or (0:00 - 23:59)
Microwave Power for Variable Cooking
Repetition Rate;
Repetition Rate;
100P ....................................................... Full power throughout the cooking time
70P .........................................................approx. 70% of FULL Power
50P ....................................................... approx. 50% of FULL Power
30P ........................................................approx. 30% of FULL Power
10P .........................................................approx. 10% of FULL Power
EXPRESS COOK button
EXPRESS DEFROST button
POWER LEVEL button
STOP/CLEAR button
START/AUTO MINUTE button
70P .........................................................approx. 70% of FULL Power
50P ....................................................... approx. 50% of FULL Power
30P ........................................................approx. 30% of FULL Power
10P .........................................................approx. 10% of FULL Power
EXPRESS COOK button
EXPRESS DEFROST button
POWER LEVEL button
STOP/CLEAR button
START/AUTO MINUTE button
TIME/WEIGHT knob
Set Weight (Approx.)
12 kg
APPEARANCE VIEW
OVEN
1. Door opening handle
2. Oven lamp
3. Door hinges
4. Door safety latches
5. Door
6. Door seals and sealing surfaces
7. Coupling
9. Control panel
10. Waveguide cover
11. Power supply cord
12. Ventilation openings
13. Outer case cabinet
14. Turntable
15. Roller stay
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