Sharp R1500 Service Manual

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TEST PROCEDURES
PROCEDURE
LETTERCOMPONENT TEST
1. Disconnect the power supply cord, and then remove outer case. Refer to procedure of " HOOD
EXHAUST LOUVER REMOVAL ", " REMOVAL OF OVEN FROM WALL " and " OUTER CASE
REMOVAL ".
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the hood intake duct R.
5. Disconnect the leads to the primary of the power transformer.
6. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
7. After that procedure, re-connect the power supply cord.
8. Check voltage between normal open terminal of the relay RY2 and the normal open terminal of the
relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1, RY2, RY3, RY4, RY5 and RY6 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated .................... Defective relay.
DC. voltage not indicated .............. Check diode which is connected to the relay coil. If diode
is good, control unit is defective.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. 26.6V D.C. Oven lamp / Fan motor / Turntable motor
RY2(COOK) Approx. 26.0V D.C. Power transformer
RY3 Approx. 26.6V D.C. Hood motor
RY4 Approx. 26.6V D.C. Hood motor
RY5 Approx. 26.6V D.C. Hood lamp
RY6 Approx. 26.6V D.C. Hood lamp
  9. Disconnect the power supply cord.
10. Open the door and block it open.
11. To discharge high voltage capacitor, wait for 60 seconds.
12. Reconnect all leads removed from components during testing.
13. Re-install the hood intake duct R.
14. Re-install the outer case (cabinet).
15. Reconnect the power supply cord after the outer case is installed.
16. Run the oven and check all functions.
NRELAY TEST
ODEFROST CENTER TEST
(1) Open the door.
(2) Place one cup of water in the center of the turntable tray in the oven cavity.
(3) Touch the " STEAKS/CHOPS " pad once.
(4) Close the door.
(5) Touch the " START " button.
(6) The oven is in Defrost center cooking condition.
(7) The oven will operate as follows.
Menu 1ST STAGE 2ND STAGE
Steaks/ChopsLEVEL TIME LEVEL TIME
0.5lbs 60% 57sec. 40% 17sec.
(8) If improper operation is indicated, the control unit is probably defective and should be checked.
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on
the PWB, this foil pattern acts as a fuse.
PFOIL PATTERN ON THE PRINTED WIRING BOARD TEST 
						

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TEST PROCEDURES
PROCEDURE
LETTERCOMPONENT TEST
1. Foil pattern check and repairs.
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Remove the control unit, referring to the procedure of " CONTROL PANEL ASSEMBLY,
CONTROL UNIT AND KEY UNIT REMOVAL ".
5) Follow the troubleshooting guide given below for repair.
STEPS OCCURRENCE CAUSE OR CORRECTION
1 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.
2 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".
6) Make a visual inspection of the varistor.
Check for burned damage and examine
the transformer with a tester for the
presence of layer short-circuit (check the
primary coil resistance which is
approximately 780Ω ± 10%). If any
abnormal condition is detected, replace
the defective parts.
7) Reconnect all leads removed from components during testing.
8) Re-install the control unit to the control panel and re-install the control panel to the oven.
9) Reconnect the power supply cord.
10) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
repairs are finished.
1) Disconnect the power supply cord, and then remove outer case. Refer to procedure of " HOOD
EXHAUST LOUVER REMOVAL ", " REMOVAL OF OVEN FROM WALL " and " OUTER CASE
REMOVAL ".
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Remove the hood intake duct R.
5) Disconnect the leads to the primary of the power transformer.
6) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
7) After that procedure, re-connect the power supply cord.
8) Follow the troubleshooting guide given below for repair.
STEPS OCCURRENCE CAUSE OR CORRECTION
The rated AC voltage is not present between
1 the normal open terminal of the relay RY2 and Check supply voltage and oven power cord.
the normal open terminal of the relay RY1.
2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.
side of low voltage transformer. Check and repair.
9) Disconnect the power supply cord.
10) Open the door and block it open.
11) To discharge high voltage capacitor, wait for 60 seconds.
12) Reconnect all leads removed from components during testing.
13) Re-install the hood intake duct R.
14) Re-install the outer case (cabinet).
15) Reconnect the power supply cord after the outer case is installed.
16) Run the oven and check all functions.
QKITPB035
VRS1
a
cd
bS
13P
J1RY2 T1 
						

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DESCRIPTION OF LSI
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No. Signal I/O Description
1-2 VL2-VL1 INPower source voltage input terminal.
Standard voltage for LCD.
3-6 AN7-AN4 IN
Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
7 AN3 OUT Back light circuit (Light emitting diodes) driving signal.
8 AN2 IN
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V).  Door open "L" level signal (-5V).
9-10 AN1-AN0 OUT Terminal not used.
11-13 P57-P55 OUT Terminal not used.
14 CNTR0 OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
Symbol Voltage Application
VC -5.3V LSI(IC1)
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit. It incorporates a very small error because it works
on commercial frequency.
4) ACL Circuit
A circuit to generate a signals which resetting the LSI to
the initial state when power is applied.
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
6) Door Sensing Switch
A switch to inform the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, fan motor, turntable motor, hood
motor, and light the oven lamp and hood lamp.
8) Indicator Circuit
This circuit consists of 22 segments and 3 common
electrodes using a Light Crystal Display.
9) Back Light Circuit
A circuit to drive the back light (Light emitting diodes LD1-
LD4). The touch control section consists of the following units
as shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit (The Control unit consists of LSI Unit and
Power U nit)
The principal functions of these units and the signals com-
municated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P20, P21, P22, P23,
P24, P25, P26 and P27.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P43, P44,
P45 and P46 to perform the function that was requested.
Control Unit
Control unit consists of LSI, power source circuit, synchro-
nizing signal circuit, ACL circuit, buzzer circuit, relay circuit
indicator circuit and back light circuit.
1) LSI
This LSI controls the key strobe signal, relay driving
signal for oven function and indicator signal.
2) Power Source Circuit
This circuit generates voltages necessary for the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
A
B
0.1 sec.
2.0 sec.H : GND
L : -5V
H : GND
L : -5V 
						

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15 P53 OUT Terminal not used.
16 P52 OUT
Oven lamp, fan motor and turntable motor driving signal
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the RY1
driving circuit and RY2 control circuit.
17-18 P51-P50 OUT Terminal not used.
19 P47 OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).  The
signals holds "L" level during microwave cook-
ing and "H" level while not cooking. In other
cooking modes (variable cooking) the signal
turns to  "H" level and "L" level in repetition
according to the power level.
(ON and OFF times for other power level.)
20 P46 IN
Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P20 - P27 will
be input into P46. When no key is touched, the signal is held at "H" level.
21 P45 IN
Signal similar to P46.
When either G11 line on key matrix is touched, a corresponding signal will be input into P45.
22 P44 IN
Signal similar to P46.
When either G10 line on key matrix is touched, a corresponding signal will be input into P44.
23 P43 IN
Signal similar to P46.
When either G9 line on key matrix is touched, a corresponding signal will be input into P43.
24 INT0 IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
25 P41 OUT Terminal not used.
26 P40 IN Connected to GND through the pull-down resistor R100.
27
RESETIN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
28-29 P71-P70 OUT Terminal not used.
30 XIN IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect
to XOUT terminal.
31 XOUT OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
32 VSS IN
Power source voltage: -5.0V.
VC voltage of power source circuit input.
33 P27 OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of
G8 line keys on key matrix is touched.
34 P26 OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of
G7 line keys on key matrix is touched.
35 P25 OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of
G6 line keys on key matrix is touched.
36 P24 OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of
G5 line keys on key matrix is touched.
16.7 msec.
During cookingH : GND
L : -5V
P-HIH : GND
L : -5V
H : GND
L : -5V P-70ON
ON OFF
OFF OFF
24 sec.
8 sec.
16.7 msec.H : GND
L : -5V
Pin No. Signal I/O Description 
						

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37 P23 OUTKey strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of
G4 line keys on key matrix is touched.
38 P22 OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of
G3 line keys on key matrix is touched.
39 P21 OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of
G2 line keys on key matrix is touched.
40 P20 OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of
G1 line keys on key matrix is touched.
41 P17 OUT
Hood lamp driving signal.
To turn on and off relay(RY6). "L" level: During
Hood lamp ON. "H" level: During Hood lamp
OFF.
42 P16 OUT
Hood lamp driving signal.
To turn on and off relay(RY5). " L " level: During
Hood lamp ON. "H" level: During Hood lamp
OFF.
 43 P15 OUT
Hood motor high / low driving signal.
To turn on and off relay(RY3). "L" level: During
Hood motor high. "H" level: During Hood motor
low.
44 P14 OUT
Hood motor driving signal.
To turn on and off relay(RY4). "L" level: During
Hood motor ON. "H" level: During Hood motor
OFF.
45-47 P13-P11 OUT Terminal not used.
48-50SEG24-SEG22OUT Terminal not used.
51-72
SEG21-SEG0OUTSegment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.)
SEG 21 (51) -------------------- SEG21 ( 1) SEG 10 (62) --------------------- SEG10 (12)
SEG 20 (52) -------------------- SEG20 ( 2) SEG   9 (63) ---------------------- SEG 9 (13)
SEG 19 (53) -------------------- SEG19 ( 3) SEG   8 (64) ---------------------- SEG 8 (14)
SEG 18 (54) -------------------- SEG18 ( 4) SEG   7 (65) ---------------------- SEG 7 (15)
SEG 17 (55) -------------------- SEG17 ( 5) SEG   6 (66) ---------------------- SEG 6 (16)
SEG 16 (56) -------------------- SEG16 ( 6) SEG   5 (67) ---------------------- SEG 5 (17)
SEG 15 (57) -------------------- SEG15 ( 7) SEG   4 (68) ---------------------- SEG 4 (18)
SEG 14 (58) -------------------- SEG14 ( 8) SEG   3 (69) ---------------------- SEG 3 (19)
SEG 13 (59) -------------------- SEG13 ( 9) SEG   2 (70) ---------------------- SEG 2 (20)
SEG 12 (60) ------------------- SEG12 (10) SEG   1 (71) ---------------------- SEG 1 (21)
SEG 11 (61) ------------------- SEG11 (11) SEG   0 (72) ---------------------- SEG 0 (22)
73/74 VCC/VREF IN Connected to GND.
75 AVSS IN Connected to VC.
76 COM3 OUT Terminal not used.
77 COM2 OUT
Common data signal: COM2.
Connected to LCD signal COM2.
78 COM1 OUT
Common data signal: COM1.
Connected to LCD signal COM1.
79 COM0 OUT
Common data signal: COM0.
Connected to LCD signal COM0.
80 VL3 IN
Power source voltage input terminal.
Standard voltage for LCD.
Pin No. Signal I/O Description
ONOFF
H : GND
L
ONOFF
H : GND
L
ONOFF
H : GND
L
ONOFF
H : GND
L 
						

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1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following
precautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
charge in clothes, etc. and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in
aluminium foil. Also wrap all PW boards containing them
in aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table.
2. Shapes of Electronic Components
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so. To perform
the servicing, power to the touch control panel is available
either from the power line of the oven itself or from an
external power source.
(1) Servicing the touch control panel with power supply
of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND  PRESENTS A HAZARD.
Therefore, before checking the performance of the touch
control panel,
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 these leads remain isolated from other
components and oven chassis by using insulation
tape.
6) After that procedure, re-connect the power supply
cord.
After checking the performance of the touch control
panel,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the powertransformer.
4) Re-install the outer case (cabinet).
5) Re-connect the power supply cord after the outer case
is installed.
6) Run the oven and check all functions.
A. On some models, the power supply cord between the
touch control panel and the oven itself is so short that the
two can’t be separated. For those models, check and
repair all the controls (sensor-related ones included) of
the touch control panel while keeping it connected to the
oven.
B. On some models, the power supply cord between the
touch control panel and the oven proper is long enough
that they may be separated from each other. For those
models, it is possible to check and repair the controls of
the touch control panel while keeping it apart from the
oven proper; in this case you must short both ends of the
door sensing switch (on PWB) of the touch control panel
with a jumper, which activates an operational state that
is equivalent to the oven door being closed. As for the
sensor-related controls of the touch control panel,
checking them is possible if dummy resistor(s) with
resistance equal to that of the controls are used.
(2) Servicing the touch control panel with power supply
from an external power source:
Disconnect the touch control panel completely from the
oven proper, and short both ends of the door sensing
switch (on PWB) of the touch control panel, which
activates an operational state that is equivalent to the
oven door being closed. Connect an external power
source to the power input terminal of the touch control
panel, then it is possible to check and repair the controls
of the touch control panel it is also possible to check the
sensor-related controls of the touch control panel by
using the dummy resistor(s).
4. Servicing Tools
Tools required to service the touch control panel
assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC-
10MHz type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing
static electricity.
2) Connect the connectors of the key unit to the control
unit being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that
abnormal voltage due to static electricity etc. is not
applied to the input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to
PWB, making sure that all connections are tight.
5) Be sure to use specified components where high
precision is required.
SERVICING
approx. 1M ohm
Transistor
KRC243M
ECB 
						

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Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may
result in severe, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly,  High Voltage Harness etc..
WARNING:Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
WARNING AGAINST HIGH VOLTAGE:
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
To prevent an electric shock, take the following pre-
cautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the followiong parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer
and Oven cavity.
WARNING FOR WIRING
1. Disconnect the power supply cord.
2. Make sure that a definite” click” can be heard when the
microwave oven door is unlatched. (Hold the door in a
closed position with one hand, then push the door open
button with the other, this causes the latch leads to rise,
it is then possible to hear a “click’ as the door switches
operate.)
3. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective  parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Open lever, Open
button.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked
and make sure that the wire leads do not  come off even
if the wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANAL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures:
THE FOLLOWING ADJUSTMENTS OR COMPONENT REPLACEMENT CAN BE PERFORMED
WITHOUT REMOVING THE OVEN FROM THE WALL
1. Hood lamps, sockets, grease filter and charcoal filter.
2. Base cover and hood lamp glass assembly.
3. Turntable motor.4. Hood exhaust louver.
5. Control panel assembly or components.
 HOOD EXHAUST LOUVER REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60seconds.
4. Remove the three (3) screws holding the hood exhaust
louver to the oven cavity front face plate. 
						

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REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven)
1. Disconnect the power supply cord, and uncoil the power
supply cord.
2. To discharge the high voltage capacitor, wait for 60
seconds.
3. Remove the turntable tray and support from the oven cavity.
4. If the exhaust damper assembly is installed, remove the
one (1) screw holding the exhaust  damper assembly to
the rear stay, and remove the exhaust  damper assembly
by sliding it backward.
5. Remove the two (2) screws holding the oven (outer casecabinet) to the top cabinet.
6. While supporting the front of the oven, pull down the two
(2) mounting levers and release the oven from the unit
mounting plate.
7. Pull the power cord out of the wall cabinet and remove
the oven.
8. The oven is now free and can be placed on the work
surface selected for servicing the oven.
9. Installation is the reverse of this procedure.
OUTER CASE REMOVAL
Remove the oven from the wall, referring to "REMOVAL OF
OVEN FROM WALL" and proceed as follows;
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove four (4) screws holding the rear stay to the hood
fan motor or the oven, and remove it.
5. Remove the six (6) screws from the rear of the outer case
cabinet and one (1) screw at front.
6. Slide the outer case cabinet back about 1 inch (3 cm) to
free it from retaining clips on the cavity face plate.
7. Disconnect the three (3) pin connector of the powersupply cord from the wiring harness and remove the
power supply cord together with the outer case.
8. Nip the cord bushing with bushing pliers and release it
from the outer case cabinet.
9. Remove the cord bushing and the power supply cord
from the outer case cabinet.
10.Now, the power supply cord is free.
CAUTION: 1.DISCONNECT OVEN FROM POWER
SUPPLY BEFORE REMOVING OUTER
CASE.
2. DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE TOUCHING ANY
OVEN COMPONENTS OR WIRING.
POWER TRANSFORMER REMOVAL
1. Disconnect the power supply cord, remove the oven
from wall, and remove outer case. (Refer to procedure of
"REMOVAL OF OVEN FROM WALL" AND  "OUTER
CASE REMOVAL".) And proceed as follows.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove three (3) screws holding the hood intake duct R
to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect main wire harness from transformer.
6. Disconnect high voltage wire A from the transformer.
7. Disconnect filament leads of transformer from the
magnetron and capacitor.
8. Remove two (2) screws holding the transformer to base
plate R.Re-install
1. Install by sliding the transformer on the base plate R with
its primary terminals toward the outer case.
2. Secure the transformer with two (2) screws to base plate
R.
3. Re-connect wire leads (primary and high voltage) to the
transformer and filament leads of transformer to
magnetron and high voltage capacitor. Refer to
"PICTORIAL DIAGRAM".
4. Re-install the hood intake duct R to the oven cavity top
plate, the oven cavity front flange and the fan duct with
three (3) screws.
5. Re-install the outer case and check that oven is operating
properly.
CAUTION:MAKE SURE THE WIRE LEADS NEVER
TOUCH THE FAN BLADE. 5. Pull the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver
to remove.
6. Now, the hood exhaust louver is free.
HOOD FAN MOTOR REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
Hood exhaust louver Left tab
Right tab
Screw Screw
Screw 
						

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4. Disconnect the 6-pin connector of the hood fan motor
from the main wire harness located at the right edge of
the oven cavity top plate and release the snap band from
the hood duct.5. Remove the hood fan motor  from the oven cavity top
plate by lifting it up.
6. Now, the hood fan motor is free.
1. Disconnect the power supply cord , remove the oven
from wall and remove outer case (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal".)
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect  the high voltage wire lead of the high
voltage rectifier assembly from the magnetron.
6. Disconnect the filament lead of the transformer from the
magnetron.
7. Remove the one (1) screw holding the hood duct R to the
oven cavity top plate. And remove the hood duct R from
MAGNETRON REMOVAL
the oven cavity top plate R.
8. Remove the magnetron duct from the oven cavity, by
releasing the tab of the magnetron duct from the oven
cavity top plate.
9. Carefully remove four (4) mounting screws holding the
magnetron to waveguide. When removing the screws
hold the magnetron to prevent it from falling.
10.Remove the magnetron from the unit with care so the
magnetron tube should not be hit by any metal object
around the tube.
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
MOUNTING SCREWS ARE TIGHTENED SE-
CURELY.
1. Disconnect the power supply cord , remove the oven
from wall and remove outer case (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal".)
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect the high voltage wire lead with high voltage
rectifier from the magnetron.
6. Disconnect filament lead of the transformer from high
voltage capacitor.
7. Disconnect high voltage wire A from capacitor.
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
8. Remove the fan duct assembly from the oven cavity,
referring to the procedure of "COOLING FAN MOTOR
REMOVAL"
9. Remove  one (1) screw holding capacitor holder and high
voltage rectifier to the fan duct.
10.Disconnect the high voltage rectifier assembly from the
high voltage capacitor.
11.Now, the high voltage rectifier assembly is free.
12.Remove capacitor from the holder.
13.Now, the high voltage capacitor is free.
CAUTION: WHEN REPLACING THE HIGH VOLTAGE
RECTIFIER ASSEMBLY, THE GROUND SIDE
TERMINAL MUST BE SECURED FIRMLY
WITH A GROUNDING SCREW.
THERMAL CUT-OUT (CAVITY) REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds. 1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
HOOD FAN THERMAL CUT-OUT REMOVAL
and the fan duct. And remove the hood intake duct R.
5. Disconnect the wire leads from the hood fan thermal
cut-out.
6. Remove one (1) screw holding the thermal cut-out to the
flange of base plate R (turntable motor side).
7. Remove the hood fan thermal cut-out from the base plate
R.
8. Now, the hood fan thermal cut-out is free.
4. Disconnect the wire leads from the thermal cut-out
(cavity).
5. Remove the thermal cut-out (cavity) from the holder at
the oven cavity bottom plate.
6. Now, the thermal cut-out (cavity) is free. 
						

							28
R-1500
R-1501
R-1505
R-1506
1. Disconnect the power supply cord, remove the oven
from wall and remove outer case (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal".)
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Remove the one (1) screw holding the hood duct R to the
oven cavity top plate. And remove the hood duct R.
6. Disconnect the wire leads from the fan motor.
7. Disconnect the high voltage wire lead with the high
voltage rectifier from the magnetron.
8. Disconnect the filament lead of the transformer from the
high voltage capacitor.
9. Disconnect the high voltage wire A from the capacitor.
10.Release the wire leads from the hole of the fan duct.
11.Remove two (2) screws holding the fan duct to oven
cavity top plate and the base plate R.
12. Remove the fan duct assembly from the oven cavity.
13.Remove the fan blade from the fan motor shaft according
the following procedure.
14.Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
CAUTION:
* Make sure that any pieces do not enter the gap
between the rotor and the stator of the fan motor
because the rotor is easily shaven by pliers and
metal pieces may be produced.
* Do not touch the pliers to the coil of the fan motor
because the coil may be cut or damaged.
* Do not disfigure the bracket by touching with the
pliers.
TEMPERATURE FUSE (MAGNETRON) REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the fan duct assembly from the oven cavity,referring to the procedure of " COOLING FAN MOTOR
REMOVAL".
5. Disconnect the wire leads from the temperature fuse
(Magnetron).
6. Remove the one (1) screw holding the temperature fuse
(Magnetron) to the fan duct.
7. Now, the temperature fuse (Magnetron) is free.
COOLING FAN MOTOR REMOVAL
15.Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
16. Now, the fan blade will be free.
CAUTION:
* Do not reuse the removed fan blade because the
hole (for shaft) may  be larger  than normal.
17.Remove the two (2) screws holding the fan motor to the
fan duct.
18.Now, the fan motor is free.
INSTALLATION
1. Install the fan blade to the fan motor shaft according to
the following procedure.
2. Hold the center of the bracket which supports the shaft
of the fan motor on the flat table.
3. Install the fan blade to the shaft of fan motor by pushing
the fan blade with a small, light weight, ball peen hammer
or rubber mallet.
4. Install the fan motor to the hood duct with the two (2) screws.
CAUTION:
* Do not hit the fan blade with excesive force when
installing because the bracket may be disfigured.
* Make sure that the fan blade rotates smooth after
installation.
* Make sure that the axis of the shaft is not slanted.
5. Install the fan duct to the oven cavity top plate and base
plate R with the two (2) screws.
6. Reconnect the wire leads to the fan motor, magnetron
and high voltage capacitor, referring to the pictorial
diagram.
7. Re-install the wire leads to the hole of the fan duct.
8. Re-install the hood intake duct R to the oven cavity top
plate, the oven cavity front flange and the fan duct with
the three (3) screws.
9. Refer to procedure of "OUTER CASE REMOVAL".  And
reverse their procedure. And re-install the outer case.
Rear View
Side View
Gap
Rotor Bracket StatorGroove joint pliers
Coil
Shaft
Axis
Stator
Rotor
These are the positions 
that should be pinched 
with pliers
Shaft
Table
Center of
bracket