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...

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R-1500
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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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".)...

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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)...