R-4H54
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER COMPONENT TEST
M PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN.
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. If the foil pattern is open, follow the trou-
bleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
ISTEPS j
OCCURENCE
,
CAUSE OR CORRECTION
/
i 1
/The rated voltage is not applied to POWER terminal / Check supply voitage and oven main unit.
/
I
: of CPU connector (CN-A)
I
I 2
j The rated voltage is applied to primary side of power ’ Power transformer or secondary circuit defective. :
t
transformer.
Check and repair.
i 3 j Only pattern at “a” is broken.
/ *Insert jumper wire Jl and solder.
/ 4
/ Pattern at “a” and “b” are broken.
/ ‘Insert the coil RCILF2003YAZZ between “c” and
/
I
/ “d”,
NOTE:* At the time of these repairs, make a visual in-
spection of the varistor for burning damage
and examine the transformer with tester for the
presence of layer short-circuit (check primary
coil resistance).
If any abnormal condition is detected, replace
the defective parts.
N
WEIGHT SENSOR ASSEMBLY AND IC3(MEMORY) TEST.
After replacing the weight sensor, turntable, control unit, turntable motor, or
IC3, carry out the following procedure in order to calibrate the weight sensor.
If the weinht sensor is not recalibrate. the food may be over or under cooked.
The following procedure should be carried out with microwave oven in a fully assembled condi-
tion (with outer case fitted).
1. Test Method
(1)
Place the turnrable on the turntable support plate correctly, and close the door.
(2) Plug the oven into a power point. (“88:88” will appear on the display.)
(3) Press the STOP/CLEAR pad. (Display shows M : ” with sound of buzzer.)
(4) Press the AUTO START/CLOCK pad. (Display shows “
0” with sound of buzzer.)
(5) Press the DEFROST SENSOR pad. (Display shows M
0~)
(6) Press the POWER LEVEL pad. (Display shows ”
On.)
(7) Press the INSTANT COOK/START pad. (Display shows w TEST” with sound of
buzzer.)
(8)
Press the “4” of number pads. (Display shows M
4“ with sound of buzzer, and tuntable
and oven lamps come on.)
(9) After 56 seconds, make sure that the display shows “00055 - 00250”11 with sound
of buzzer.
If display shows less than 00055 or more than 00250, weight sensor is defect.
(10) Place the weight 1.3 kg+1 % (water load 1.3 kg+1 %) on the turntable.
(11) Press the “6” of number pads. (Display shows ”
turntable and oven lamps come on.)
6” with sound of buzzer, and
(12) After 56 seconds, make sure that the display shows “00030 - 00200”” with sound
of buzzer.
11
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