16
R-22AM
R-23AM
R-23AT
Room Temp. 59˚F (15˚C) 68˚F (20˚C) 77˚F (25˚C)
Resistance Approx. 16 kΩ Approx. 13 kΩ Approx. 11 kΩ
If the meter does not indicate above resistance, replace the thermistor.
3. CARRY OUT 4R CHECKS.
O TOUCH CONTROL PANEL ASSEMBLY TEST FOR R-23AT
If incorrect readings are absorbed, replace the noise filter.
CARRY OUT 4R CHECKS.
N HIGH VOLTAGE FUSE TEST
CARRY OUT 3D CHECKS.
If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron.
Check them and replace the defective parts and the high voltage fuse.
CARRY OUT 4R CHECKS.
CAUTION: Only replace high voltage fuse with the correct value replacement.
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
L MOTOR WINDING TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two
terminals.
Resistance of Blower motor should be approximately 52Ω.
Resistance of Stirrer motor should be approximately 8.8 kΩ.
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
M NOISE FILTER TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of noise filter. Using an ohmmeter, check between the
terminals as described in the following table.
MEASURING POINT INDICATION OF OHMMETER
Between N and L Approx. 680 kΩ
Between terminal N and WHIT Short circuit
Between terminal L and BLK Short circuit
F1 : WEAK POINT
NOISE FILTER
NOISE SUPPRESSION COIL
DISCHARGE RESISTOR 680 kΩ 1/2W
DISCHARGE RESISTOR 10 MΩ 1/2W
LINE CROSS CAPACITOR 0.22µF/ AC250V
LINE CROSS CAPACITOR
10000 pF/ AC250V
LINE CROSS CAPACITOR
10000 pF/ AC250V
L
BLK
WHT
N
The touch control panel consists of circuits including semiconductors such as LSI, IC, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter. In this service manual, the touch control panel assembly is divided into two units,
Control Unit and Key Unit, troubleshooting by unit replacement is described according to the symptoms
indicated.
1. Key Unit Note : Check key unit ribbon connection before replacement.
The following symptoms indicate a defective key unit. Replace the key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching the pads, sometimes a pad produces no signal.
2. Control Unit
The following symptoms may indicate a defective control unit. Replacing the control unit. Before
replacing the control unit, perform the key unit test (Procedure P) to determine if control unit is faulty.
2-1 Programming problems.
a) When touching the pads, a certain group of pads do not produce a signal.
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