11
R-1490
R-1491
R-1492
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Sensor Dummy Resistor Circuit
R1, R2 : 22Ω ± 1% 1/2W
R3 : 4.3kΩ ± 5% 1/4W
R4 : 1MΩ ± 5% 1/4W
Plunger
NC
NO
COM
COM
NO
NC
R3 R4
R1
R2
1
2
3
F-1
F-2
F-3
To connector (F)
on Control Unit.
CONNECTOR
(11) Open the door and block it open.
(12) Discharge high voltage capacitor.
(13) Disconnect the dummy resistor circuit from the sensor connector of control panel.
(14) Carry out necessary repair.
(15) Reconnect all leads removed from components during testing and repairing.
(16) Re-install the outer case (cabinet).
(17)
Reconnect the power supply cord after the outer case is installed. Run the oven and check all
functions.
(18) Carry out “Water load cooking test” again and ensure that the oven works properly.
DESCRIPTION OF LSI
LSI(IZA877DR)
The I/O signals of the LSI(IZA877DR) are detailed in the following table.
Pin No. Signal I/O Description
NOTE: For additional informations of LSI, please refer back to the R-1480 base
model Service Manual.
5 AN7 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is
an analog input terminal from the AH sensor circuit, and connected to the A/D converter
built into the LSI.
6 AN6 IN AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
60-64 P34-P30 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
1) LSI
This LSI controls the AH sensor signal, key strobe signal, relay driving signal for oven function and indicator signal.
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