R-654M (serv.man5). Complete - Sharp Home Appliance Service Manual (repair manual)

r-654m (serv.man5) service manual
Model
R-654M (serv.man5)
Pages
24
Size
504.25 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Complete
File
r-654m-sm5.pdf
Date

Read Sharp R-654M (serv.man5) Service Manual online

R-654M -1
 SERVICE MANUAL
S50196R654M//
SHARP CORPORATION
Page
SERVICING ................................................................................................................................................. 2
CAUTION WARNING / PRODUCT DESCRIPTION .................................................................................... 3
OPERATION SEQUENCE / FUNCTION OF IMPORTANT COMPONENTS .............................................  4
TEST PROCEDURES ................................................................................................................................  6
TOUCH CONTROL  PANEL ........................................................................................................................ 8
COMPONENT REPLACEMENT ................................................................................................................ 12
MICROWAVE MEASUREMENT ..............................................................................................................  13
WIRING / RE-WIRING ............................................................................................................................... 13
SCHEMATIC DIAGRAM ............................................................................................................................ 14
PICTORIAL DIAGRAM .............................................................................................................................. 15
POWER UNIT CIRCUIT DIAGRAM ........................................................................................................... 16
CONTROL PANEL CIRCUIT DIAGRAM ................................................................................................... 17
PRINTED WIRING BOARD DIAGRAM ..................................................................................................... 18
PARTS LIST .............................................................................................................................................  19
EXPLODED DIAGRAM OF OVEN PARTS ............................................................................................... 21
CONTROL PANEL AND DOOR PARTS ................................................................................................... 22
MISCELLANEOUS/PACKING AND ACCESSORIES.................................................................................23
TABLE OF CONTENTS
GRILL AND
MICROWAVE OVEN
MODELS
R-654(W)M
R-654(SL)M
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be
used.
R-654M -2
 WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with
following parts will result in electrocution:-
High voltage capacitor, High voltage transformer, Magnetron, High voltage rectifier, High voltage harness.
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
WARNING AGAINST THE CHARGE OF THE HIGH-VOLTAGE 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 using a screwdriver with an insulated handle.
Microwave ovens should not be used without a load.   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 microwave timer for one (1) minute,
set the power level to HIGH (100%) and push the start key. When the one (1) minute has elapsed (timer at zero)
carefully check that the water is now hot.
AFTER REPAIR REMEMBER TO CHECK 4R
1) Reconnect all leads removed from components during testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
When all service work is completed, and the oven is fully assembled, the microwave power output should be
checked and microwave leakage test carried out.
IMPORTANT: If the oven becomes inoperative because of a blown fuse F8A in the 1st latch switch - monitor
switch circuit, check the 1st latch switch and monitor switch before replacing the fuse F8A.
Sharp recommend that wherever possible, fault-finding is carried out with the supply disconnected.  In
some cases, it may be necessary to connect the supply with  the cover removed to carry out fault investi-
gation in the control circuitry.  In such cases, the high voltage circuit should be disabled as described below
to reduce the hazards:-
Carry out 3D checks (see above).
Disconnect the supply leads from the high voltage transformer, making a note of the polarity.  Insulate the
connectors, ensuring they are positioned away from the transformer and fastened there.
Connect any relevant test equipment e.g. voltmeter.
Reconnect the oven to the supply, then close the door.
Note the results of the test, taking care to keep clear of the operational oven.
Carry out 3D checks (see above).
Reconnect the leads to the transformer.  Take care to observe correct polarity.
Carry out 4R checks (see below).
SERVICING
R-654M -3
CAUTION / WARNING
WARNING
Servicing and repair work must be carried out only by
trained service engineers.
The parts marked '*' on the parts list and schematic
diagram have voltages in excess of 250V.
Removal of the outer wrap gives access to potential
above 250V.
All the parts marked "
" on the parts list may cause
undue microwave exposure, by themselves, or when
they are damaged, loosened or removed.
CAUTION
MICROWAVE RADIATION
Do not become exposed to radiation from the
magnetron or other parts conducting microwave
energy.  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
THIS APPLIANCE MUST BE EARTHED
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW : EARTH        BLUE : NEUTRAL        BROWN : LIVE
If the mains lead is replaced, only part  number QACCBA004URE3 should be used
SPECIFICATION
ITEM
DESCRIPTION
PRODUCT DESCRIPTION
As part of our policy of continuous improvement, we reserve the right to
alter design and specifications without notice
Power Requirements
230-240 Volts
50 Hertz
Single phase, 3 wire earthed
Power Consumption
Microwave cooking
1.25 W  Approx. 5.5A
Grill Cooking
1050 W  Approx. 4.4A
Microwave/Top Grill
2250  W  Approx 9.7A
Power Output
800 W nominal of RF microwave energy
Operating frequency 2450 MHz
Grill heating element Power Output (Top Grill)
1000 W (500 W x 2)
Case Dimensions
Width
449 mm
Height
282 mm including foot
Depth
388mm
Cooking Cavity Dimensions
Width
290 mm
Height
194 mm
Depth
313 mm
Turntable diameter
272 mm
Control Complement
Simple Touch Control System
Microwave Power for Variable Cooking
Repetition Rate;
HIGH ...................................... Full power throughout the cooking time
MEDIUM HIGH ......................................  approx. 70% of FULL Power
MEDIUM ................................................  approx. 50% of FULL Power
MEDIUM LOW .......................................  approx. 30% of FULL Power
LOW .......................................................  approx. 10% of FULL Power
TIME keys
EXPRESS COOK keys                            DELAY START/CLOCK SET key
MEAL IN ONE keys                                  START/AUTO MINUTE keys
AUTO COOK key                                     STOP/CLEAR key
GRILL key                                                 KITCHEN TIMER key
DUAL GRILL key                                      WEIGHT keys
LESS/MORE keys                                    MICROWAVE POWER LEVEL key
WEIGHT CONVERSION key
Net Weight
Approx. 14 kg
R-654M -4
OPERATION SEQUENCE
OFF CONDITION
Closing the door activates all door interlock switches
(Monitored latch switch, and stop switch.)
MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING
When the microwave oven is preset for variable cooking
power, the 240 volts is supplied to the high voltage
transformer intermittently within a 32-second time base
through the relay contact which is coupled with the
current-limiting relay RY3. The following levels of micro-
wave power are given.
FUNCTION OF IMPORTANT COMPONENTS
32 sec. ON
24 sec. ON
18 sec. ON
12 sec. ON
6 sec. ON
8.0 sec. OFF
14 sec. OFF
20 sec. OFF
26 sec. OFF
HIGH
MEDIUM 
HIGH
MEDIUM
MEDIUM 
LOW
LOW
Approx. 70%
Approx. 50%
Approx. 30%
Approx. 10%
100%
Note:
The On/Off time ratio does not exactly corre-
spond to the percentage of microwave power,
because  approx. 2 seconds  are needed for
heating up the magnetron filament.
SETTING
DOOR OPEN MECHANISM
The door can be opened by pulling the door.
Figure D-1. Door Open Mechanism
MONITORED LATCH SWITCH (SW1) AND STOP
SWITCH (SW3)
1. When the oven door is closed, the contacts (COM-
NO) must be closed.
2. When the oven door is opened, the contacts (COM-
NO) of each switch must be opened.
MONITOR SWITCH (SW2)
1. When the oven door is closed, the contacts (COM-
NC) must be opened.
2. When the oven door is opened, the contacts (COM-
NC) must be closed.
3. If the oven door is opened and the contacts (COM-
NO) of the monitored latch switch (SW1) fail to open,
the fuse F1 blows immediately after closing the con-
FUSE F1 250V(F8A)
1. If the wire harness or electrical components are
short-circuited, this fuse blows to prevent an electric
shock or fire hazard.
2. The fuse also blows when monitored latch switch
remains closed with the oven door open and when
the monitor switch contact (COM-NC) closes.
3. The fuse also blows when the H.V. rectifier, H.V. wire
harness, H.V. capacitor, magnetron or secondary
winding of high voltage transformer is shorted.
THERMOSTAT 150˚C (OVEN)
The thermal cut-out protects the oven against the over
heat during grill cooking or combi grill cooking. If the
temperature rises above 150˚C because the fan motor
is interrupted, the air inlet duct is blocked or the ventila-
tion openings are obstructed, the thermal cut-out opens
and switches off the all electrical parts. The defective
thermal cut-out  makes the contact by cooling down.
THERMOSTAT 150˚C HV TRANSFORMER
This thermal cut-out protects the high voltage trans-
former against overheating. If the temperature goes up
higher than 150˚C because the fan motor is interrupted
or the ventilation openings are blocked, the thermal cut-
out  will open and line voltage to the high voltage
transformer will cut off and operation of the magnetron
will be stopped.  The defective thermal cut-out makes
the contact by cooling down.
tacts (COM-NC) of the monitor switch (SW2).
CAUTION: BEFORE REPLACING A BLOWN FUSE  F1
TEST MONITORED LATCH SWITCH (SW1)
AND  MONITOR SWITCH (SW2) FOR
PROPER OPERATION.  (REFER TO CHAP-
TER “TEST PROCEDURE”).
Latch hook
SW3: Stop switch
Door
SW2: Monitor switch
SW1:Monitored latch switch
Latch heads
Page of 24
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Here you can read online and download Sharp R-654M (serv.man5) Service Manual in PDF. R-654M (serv.man5) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp R-654M (serv.man5) Microwave Oven. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.