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599 36 78-45
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
3. Connect the voltmeter, set to 250V AC, across the motor terminals. (Refer
to the relevant motor test procedure or pictorial diagram for the correct
terminal
numbers.)
4. Arrange the meter in a position where it can be read during the test.
(Do not touch the meter, meter leads or oven circuitry while the oven is
active.)
5. Close the oven door.
6. Set the power level to 900W and set the relevant timer for about three (3)
minutes.
7. Note the reading on the meter and carefully observe the motor under test to
see if it is turning.
8. CARRY OUT 3D CHECKS.
9. Remove the test meter leads.
10.Reconnect the leads to the primary of the high voltage transformer.
If a reading of the line voltage was obtained (step 7) but the motor was not
turning then it is faulty and should be replaced. If the meter indicated that the
no supply was present then the winding to the motor should be O.K.. Other
circuit checks should be made, i.e. relays, switches.
K
TOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel consists of circuits including semiconductors such as
LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper
maintenance can not be performed with only a voltmeter and ohmmeter.
In this service manual, the touch control panel assembly is in four units,
Control unit, Switch Unit, LED Unit and Relay Unit. Troubleshooting by unit
replacement is described according to the symptoms indicated.
1. Switch Unit.
NOTE: Check switch unit lead wire harness connection
before
replacement.
The following symptoms indicate a defective switch unit. Replace the
switch
unit.
a)
When touching the keys, a certain key produces no signal at all.
b)
When touching a key, two figures or more are displayed.
c) When touching the keys, sometimes a key produces no signal.
2. Control Unit
The following symptoms indicate a defective control unit. Before replace
the control unit, perform the switch unit test (Procedure L) to determine if
control unit is faulty.
2-1 In connection with keys.
a) When touching a key, a certain group of keys do not produce a signal.
b) When touching a key, no keys produce a signal.
2-2.In connection with indicators.
a)
At a certain digit, all or some dots do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light up.
d) The corresponding dots 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.
h) When touching a tact switch, the control unit does not respond.
2-3.Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
3. LED Unit
a) No backlight behind display.
b) Dull backlight behind display.
