Read Sharp R-465 (serv.man3) Service Manual online
R-465(SL)
10
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 high voltage fuse.
Check them and replace the defective parts and high voltage fuse.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE THE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE RE-
PLACEMENT
K
HIGH VOLTAGE FUSE TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a
voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two
units, Control Unit and Key Unit, and also the Control Unit is divided into two units, CPU Unit and
Power Unit, and troubleshooting by unit replacement is described according to the symptoms
indicated.
unlike conventional microwave ovens, proper maintenance cannot be performed with only a
voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two
units, Control Unit and Key Unit, and also the Control Unit is divided into two units, CPU Unit and
Power Unit, and troubleshooting by unit replacement is described according to the symptoms
indicated.
1. Key Unit. Note: Check key unit ribbon connection before replacement.
The following symptoms indicate a defective key unit. Replace the key unit.
a) When touching the keys, a certain key produces no signal at all.
b) When touching a number key, two figures or more are displayed.
c) When touching the keys, sometimes a key produces no signal.
a) When touching the keys, a certain key produces no signal at all.
b) When touching a number key, two figures or more are displayed.
c) When touching the keys, sometimes a key produces no signal.
2. Control Unit.
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure M) to determine if control unit is faulty.
the Key unit test (Procedure M) to determine if control unit is faulty.
2-1 In connection with keys.
a) When touching the keys, a certain group of keys do not produce a signal.
b) When touching the keys, no keys produce a signal.
b) When touching the keys, no keys produce a signal.
2-2 In connection with indicators.
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
L
TOUCH CONTROL PANEL ASSEMBLY TEST
If the fuse F10A is blown by incorrect door switching replace the defective switch(s) and the fuse
F10A.
F10A.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE FUSE M10A WITH THE CORRECT VALUE REPLACEMENT
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the noise
filter. Using an ohmmeter, check between the termi-
nals as described in the following table.
Disconnect the leads from the terminals of the noise
filter. Using an ohmmeter, check between the termi-
nals as described in the following table.
MEASURING POINT
INDICATION OF
OHMMETER
OHMMETER
Between N and L
Approx. 680 k
Ω
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.
J
NOISE FILTER TEST
NOISE FILTER
RESISTOR 10 M
Ω
1/2W
FUSE
F10A
F10A
N
L
LINE CROSS CAPACITOR
0.22
µ
/AC250V
NOISE SUPPRESSION COIL
WHT
RED
LINE BYPASS CAPACITOR
0.0033
0.0033
µ
/AC250V
LINE BYPASS CAPACITOR
0.0033
0.0033
µ
/AC250V
RESISTOR 680 K
Ω
1/2W
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