R-2S56
15
STEPS
OCCURANCE
CAUSE OR CORRECTION
1
The rated voltage is not applied to POWER
Check supply voltage and oven main unit.
terminal of CPU connector (CN-A)
2
The rated voltage is applied to primary
Power transformer or secondary circuit defective.
side of power transformer.
Check and repair.
3
Only pattern at "a" is broken.
*Insert jumper wire J1 and solder.
4
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ between "c" and "d".
MEASURING POINT
INDICATION OF OHMMETER
Between N and L
Approx. 1.5 M
Ω
Between terminal N and WHITE
Short circuit
Between terminal L and RED
Short circuit
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 troubleshooting guide given
below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
N
NOISE FILTER TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the noise
filter. Using an ohmmeter, check between the terminals
as described in the following table.
If incorrect readings are obtained, replace the noise filter unit.
CARRY OUT 4R CHECKS.
FUSE
M6.3A
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
0.0022µ/AC250V
RESISTOR 10M/0.5W
N
L
LINE BYPASS CAPACITOR
0.0022µ/AC250V
RESISTOR 1.5M/0.5W
LINE BYPASS CAPACITOR
0.068µ/AC250V
RED
WHT
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
APPROX. 19.0V D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
APPROX. 18.0V D.C.
Power transformer
CARRY OUT 4R CHECKS.
NOTE: At the time of these repairs, make a visual
inspection 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.
CARRY OUT 4R CHECKS.
VRS1
CN-A
(J1)
RY2
POWER
5
D82
a
c
b
d
