Read Sharp R-556D (serv.man2) Service Manual online
R556D
8 – 3
[7] Procedure G: 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.
[8] Procedure H: FUSE F10A
CARRY OUT 3D CHECKS.
1. If the fuse F10A is blown, there could be shorts or ground in electrical parts or wire harness.
Check them and replace the defective parts or repair the wire harness.
2. If the fuse F10A is blown when the door is opened, check the 1st. latch switch, 2nd. interlock relay and monitor switch.
If the fuse F10A is blown by incorrect door switching replace the defective switch(es) and the fuse F10A.
CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE FUSE F10A WITH THE CORRECT VALUE REPLACEMENT.
[9] Procedure I: NOISE FILTER TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the noise filter. Using an ohmmeter,
check between the terminals as described in the following table.
check between the terminals as described in the following table.
If incorrect readings are obtained, replace the noise filter unit.
CARRY OUT 4R CHECKS.
[10] Procedure J: HIGH VOLTAGE FUSE TEST
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.
[11] Procedure K: TOUCH CONTROL PANEL ASSEMBLY 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.
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 control unit assembly.
1) When touching the keys/ buttons, a certain pad produces no signal at all.
2) When touching a number key, two figures or more are displayed.
3) When touching the keys/ buttons, sometimes a pad 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 L) to determine if
control unit is faulty.
control unit is faulty.
1) In connection with keys/ buttons.
a) When touching the keys/ buttons, a certain group of pads do not produce a signal.
b) When touching the keys/ buttons, no pads produce a signal.
2) In connection with indicators.
Table: Resistance of Motor
Motors
Resistance
Fan motor
Approximately 250
Ω
Turntable motor
Approximately 14.5 k
Ω
MEASURING POINT
INDICATION OF OHMMETER
Between N and L
Open circuit
Between terminal N and WHITE
Short circuit
Between terminal L and RED
Short circuit
R E D
W HT
FU
S
S
E
F1
0
0
A
N
L
LINE C R OS S C AP AC IT OR
0.068μ/AC 250V
NOIS E S UP P R E S S ION C OIL
LINE B Y P AS S C AP AC IT OR
0.0022μ/AC 250V
0.0022μ/AC 250V
LINE B Y P AS S C AP AC IT OR
0.0022μ/AC 250V
0.0022μ/AC 250V
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