Sharp Carousel R-880FS Service Manual - Page 17

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Sharp Carousel R-880FS Service Manual
PROCEDURE
LETTER
H
BLOWN FUSE 15A
CARRY OUT 3D CHECKS.
If the fuse 15A is blown, there could be a short or ground in electrical parts or wire harness. Check them
and replace the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS.
CAUTION:
I
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.
If incorrect readings are absorbed, replace the noise filter unit.
CARRY OUT 4R CHECKS.
J
MOTOR WINDING TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two
terminals as described in the table below.
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
K
TOP HEATERS AND BOTTOM HEATER TEST
CARRY OUT 3D CHECKS.
Before carrying out the following tests make sure the heater is cool completely.
1. Resistance of heater.
Disconnect the wire leads to the heater to be tested. Using ohmmeter with low resistance range.
Check the resistance across the terminals of the heater as described in the following table.
2. Insulation resistance.
Disconnect the wire leads to the heater to be tested. Check the insulation resistance between the
heater terminal and cavity using a 500V - 100M insulation tester. The insulation resistance should
be more than 10 M in the cold start.
If the results of above test 1 and/or 2 are out of above specifications, the heater is probably faulty and
should be replaced.
CARRY OUT 4R CHECKS.
TEST PROCEDURES
Only replace fuse 15A with the correct value replacement.
MEASURING POINTS
Between N and L
Between terminal N and WHITE
Between terminal L and RED
Table: Resistance of Motor
Motors
Fan motor
Turntable motor
Convection motor
Table: Resistance of heater
Parts name
Top heaters
Bottom heater
COMPONENT TEST
N
L
INDICATION OF OHMMETER
Approx. 680 k
Short circuit
Short circuit
Resistance
Approximately 290
Approximately 15 k
Approximately 293
Resistance
Approximately 24
Approximately 72
15
R-880F(S)
WHT
RED
x 2 = 48