Noise Filter Test; Blown Fuse - Sharp R-3A53 Service Manual

R-3A53
R-3A53B
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
NOISE FILTER TEST
WHT
CARRY OUT 3D CHECKS
Disconnect the leads from the terminals
Rl 10 M ohm f 20%
of the noise filter.
Using an ohmmeter, check between the
terminals as described in the following
L iminl
cxtzo%
l.OmH 0 06&F
R2 1 5 M ohm f 20%
CvtZo?d
0 0022,1F
table.
MEASURING POINTS
------I-
INDICATION OF OHMMETER
Between N and L
Approximately 1.5M0
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
K
BLOWN FUSE F M6.3A
CARRY OUT 3D CHECKS
1. If the fuse M6.3A is blown, there could be a shorts or ground in electrical parts or wire har-
ness. Check them and replace the defective parts or repair the wire harness.
2. If the fuse M6.3A is blown when the door is opened, check the 1st latch switch, 2nd latch
switch, monitor switch and monitor resistor.
If the fuse M6.3A is blown by incorrect door switching replace the defective switch(s) and
the fuse M6.3A.
3. If the fuse M6.3A is blown, there could be a short in the asymmetric rectier or there could be
a ground in wire harness.
A short in the asymmetric rectifier may have occured due to short
or ground in H.V. rectifier, magnetron, power transformer or H.V. wire. Check them and re-
place the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS
CAUTION: Only replace fuse with the correct value replacement.
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