TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
N 
F1
L 
WHT
L 
Cx
L
Cy BLK
L (min) | Cx ± 20% | Cy ± 20% |
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0.5mH | 0.22 μF | 4700 pF |
MEASURING POINT | INDICATION OF OHMMETER |
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Between N and L | Open circuit |
Between terminal N and WHITW | Short circuit |
Between terminal L and BLK | Short circuit |
If incorrect readings are absorbed, replace the noise filter.
CARRY OUT 4R CHECKS.
NTOUCH CONTROL PANEL ASSEMBLY TEST
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 Switch Unit, troubleshooting by unit replacement is described according to the symptoms indicated.
1.Key Unit
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.
a)When touching the pads, a certain group of pads do not produce a signal.
a)For a certain digit, all or some segments do not light up.
b)For a certain digit, brightness is low.
c)Only one indicator does not light.
d)The corresponding segments of all digits do not light up; or they continue to light up.
e)Wrong figure appears.
f)A certain group of indicators do not light up.
g)The figure of all digits flicker.
a)Buzzer does not sound or continues to sound.
b)Cooking is not possible.
Note: When defective components, (the Control Unit or Key Unit) are replaed, the defective part or parts must be properly packed for return in the shipping carton. with its cushion material, in which the new replacement part was shipped to you.
OKEY UNIT TEST
f the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is making good contact, verify that the door sensing switch (stop switch ) operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the door sensing switch (stop switch ) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the stop switch connector ). Use the key unit matrix indicated on the control panel schematic and place a jumper
wire between the pins that corre- |
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spond to the STOP/CLEAR pad |
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| G 8 |
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| G 7 |
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| G 6 |
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| G 5 |
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| G 4 |
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| G 3 |
| G 2 |
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| G 1 |
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making momentary contact. If the |
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G 9 |
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| X2 |
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| 7 |
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control unit responds by clearing |
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with a beep, the key unit is faulty |
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| 8 |
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G 10 |
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and must be replaced. If the con- |
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| 9 |
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G 11 |
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trol unit does not respond, it is |
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faulty and must be replaced. |
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| 0 |
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G 12 |
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15
