R-84ST (serv.man3). Part 1 Text(1-18) — Sharp Home Appliance Service Manual (repair manual)

Model
R-84ST (serv.man3)
Pages
18
Size
796.65 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Part 1 Text(1-18)
File
r-84st-sm3.pdf
Date

View Sharp R-84ST (serv.man3) Service Manual online

R-84STM - 1
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
S71101R84STM/
GRILL AND CONVECTION
MICROWAVE OVEN
R-84STM
SHARP CORPORATION
SERVICE MANUAL
TABLE OF CONTENTS
Page
SERVICING .............................................................................................................................................  2
CAUTION, MICROWAVE RADIATION ....................................................................................................   3
WARNING ................................................................................................................................................. 3
APPEARANCE ......................................................................................................................................... 4
PRODUCT SPECIFICATIONS ................................................................................................................. 5
OPERATION SEQUENCE ........................................................................................................................ 6
TEST PROCEDURES .............................................................................................................................  7
TOUCH CONTROL  PANEL ASSEMBLY .............................................................................................. 10
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................  16
MICROWAVE MEASUREMENT ...........................................................................................................   18
SCHEMATIC DIAGRAM ........................................................................................................................  19
PICTORIAL DIAGRAM ..........................................................................................................................  20
POWER UNIT CIRCUIT DIAGRAM ........................................................................................................ 21
CPU UNIT CIRCUIT DIAGRAM .............................................................................................................. 22
PRINTED WIRING BOARD DIAGRAM .................................................................................................. 23
PARTS LIST ..........................................................................................................................................  24
EXPLODED DIAGRAM OF OVEN PARTS ............................................................................................ 27
CONTROL PANEL/DOOR PARTS ......................................................................................................... 28
MISCELLANEOUS/PACKING & ACCESSORIES .................................................................................. 29
MODEL
R-84STM - 2
SERVICING
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.
 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 wires.
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.
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 investigation 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).
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.
IMPORTANT:
If the oven becomes inoperative because of a blown fuse F8A Fuse, check the monitored latch switch
and monitor switch before replacing the fuse F8A.
WARNING: WIRING / RE-WIRING
Before carrying out any work; carry out 3D checks.
1) Disconnect the supply.
2) Open the door and wedge open.
3) Discharge the high voltage capacitor.
RE-WIRING
1) Wires must not touch:
a) High voltage parts.
b) Parts that become hot.
c) Sharp edges.
d) Movable parts.
2) Positive lock connectors are fitted correctly
3) Wires are connected correctly as per pictorial diagram.
4) No wire leads are trapped by the outer wrap.
R-84STM - 3
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.
CAUTION / WARNING
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
If the mains lead is replaced, only part number QACCBA004URE3 should be used
R-84STM - 4
OVEN
APPEARANCE VIEW
1
2
3
4
5
8
7
6 10
9
10
12
11
1.
Grill heating element (top grill)
2.
Oven lamp
3.
Control panel
4.
Door opening button
5.
Waveguide cover
6.
Oven cavity
CONTROL PANEL
7.
Turntable motor shaft
8.
Grill heating element (bottom grill)
9.
Door seals
10.
Air-vent openings
11.
Outer cabinet
12.
Power cord
   4
   3
   2
   1
   5
  6
 7
 8
 9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 25
 26
 27
 24
DIGITALAL DISPLAY
1.
MICROWAVE indicator
2.
CONVECTION indicator
3.
BOTTOM GRILL indicator
4.
TOP GRILL indicator
5.
COOK indicator
6.
DEFROST indicator
7.
AUTO indicator
8.
LESS/MORE indicators
9.
INFO indicator
           10.
MICROWAVE POWER LEVEL percentage
           11.
WEIGHT indicators
CONTROL PANEL
           12.
TIME keys
           13.
INSTANT COOK keys
           14.
EXPRESS COOK keys
           15.
EXPRESS DEFROST keys
           16.
MEAL IN ONE keys
           17.
CONV. (
0
C) key
           18.
DUAL CONV./GRILL key
           19.
LESS/MORE keys
           20.
INFO key
           21.
START/AUTO MINUTE key
           22.
STOP/CLEAR key
           23.
KITCHEN TIMER/CLOCK SET key
           24.
WEIGHT CONVERSION key
           25.
WEIGHT keys
           26.
MICRO. POWER key
           27.
GRILL key
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Here you can view online or download Sharp R-84ST (serv.man3) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp R-84ST (serv.man3) Microwave Oven. Information contained in Sharp R-84ST (serv.man3) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).