Sharp R-5L16 Service Manual page 16

R-5L16
PROCEDURE
LETTER
K NOISE FILTER TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the terminals of noise filter.
Using an ohmmeter, check between the terminals as de-
scribed in the following table.
If incorrect readings are absorbed, replace the noise filter unit.
CARRY OUT 4R CHECKS
L MONITOR RESISTOR AND SURGE RESISTOR TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the monitor resistor or surge resistor.
Using an ohmmeter and set on a low range.
Check between the terminals of the monitor resistor or surge as described in the following table.
If incorrect readings are obtained, replace the monitor resistor or surge resistor
CARRY OUT 4R CHECKS
M 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
N RELAY TEST
CARRY OUT 3D CHECKS
Disconnect the leads to terminals A1 and A2. Connect an ohmmeter across the terminals A1 and A2, a
reading of approximately 1.7 kohms should be indicated. If this is not the case then the relay coil is
probably faulty and the relay should be replaced.
CARRY OUT 4R CHECKS
Relay contact test for short circuit:
CARRY OUT 3D CHECKS
Isolate terminals A1 and A2, 1, 2, 5 and 6 of the relay. Using an ohmmeter,
check continuity between terminals 1 and 2 and between terminal 5 and 6.
A reading of infinite resistance should be obtained. If this is not the case
then the relay is probably faulty and should be replaced.
CARRY OUT 4R CHECKS
TEST PROCEDURES (CONT'D)
MEASURING POINTS
Between N and L
Between terminal N and WHITE
Between terminal L and RED
Resistor
Monitor resistor
Surge resistor
Table: Resistance of Motor
Motors
Fan motor
Turntable motor
14
COMPONENT TEST
N
L
L (min)
1.0mH
INDICATION OF OHMMETER
Table: Resistance
Resistance
Approx. 4.3Ω
Approx. 10Ω
Resistance
Approximately 186 ohms
Approximately 16 kohms
WHT
L
L
RED
Cx Cy
F6.3A
Cx ± 20% Cy ± 20%
0.22µF 0.0033µF
Open circuit
Short circuit
Short circuit
COIL
A1
5
3
1
RELAY
A2
6
4
2