Sharp R-209FW, Service Manual

Page: 15 / 36

R-209(IN)
R-209(W)
R-209(Y)
13
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Using an ohmmeter, check between the terminals as described in
the following table.
MEASURING POINTS INDICATION OF OHMMETER
Between N and L Open circuit
Between terminal N and WHITE Short circuit
Between terminal L and RED Short circuit
If incorrect readings are obtained, replace the noise filter unit.
CARRY OUT 4R CHECKS.
I 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.
Table: Resistance of Motor
Motors Resistance
Fan motor Approximately 400
Ω
Turntable motor Approximately 14.5 k
Ω
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
CARRY OUT 3D CHECKS.
If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron.
Check them and replace the defective parts and the high voltage fuse.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACEMENT.
J HIGH VOLTAGE FUSE F2 TEST
K TIMER MOTOR TEST
CARRY OUT 3D CHECKS before any of the following timer tests.
TIMER SWITCH- CONTACTS
Disconnect the leads from terminals described at following table. Connect an ohmmeter across
terminals described at following table.
Advance the timer and check that a short circuit reading is obtained on the meter.
Turn the timer back to the zero (0) position and check that an open circuit reading is obtained on the
meter. If these readings are not obtained then replace the timer.
Disconnecting and checking terminals 1 and 2
TIMER - MOTOR
Disconnect the leads from terminals described at following table. Connect an ohmmeter across the
timer motor winding, terminals are described at following table, and check that a reading of resistance
described at following table is indicated.
If this reading is not obtained then the timer is probably defective and should be replaced.
Disconnecting and checking terminals 3 and 4
Resistance of motor winding approximately 22.2 kohms
CARRY OUT 4R CHECKS after any of the above tests.
FUSE
T6.3A F1:
N
L
LINE CROSS CAPACITOR
0.068
µ
/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.0022
µ
/AC250V
LINE BYPASS
CAPACITOR
0.0022
µ
/AC250V
NOISE FILTER
WHT RED
M
4
2
3
1