SOI 01.05 FV 20/33 599 36 78-06
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
K
SWITCH UNIT TEST
If the display fails to clear when the STOP key is depressed, first verify the
lead wire harness is marking good contact, verify that the stop switch
operates properly; that is the contacts are closed when the door is closed and
open when the door is open. If the stop switch is good, disconnect the lead
wire harness that connects the switch unit to the control unit and make sure
the stop switch is closed (either close the door or short the stop switch
connecter). Use the switch unit matrix indicated on the switch unit circuit and
place a jumper wire between the pins that correspond to the STOP key
making momentary contact. If the control unit responds by clearing with a
beep the switch unit is faulty and must be replaced. If the control unit does not
respond, it is a faulty and must be replaced. If a specific key does not
respond, the above method may be used (after clearing the control unit) to
determine if the control unit or switch unit is at fault.
MC1751E/
Mc1761E/
MOA4117
EMS1750X/EMS1760X/
ZM175ST/ZM176ST/
QN4025/QN4026/
JMW1051/JMW1061
SW
USAGE USAGE
1
Start/Quick Start/Quick
2
Not Used Not Used
3
Stop Stop
4
Power Level Not Used
5
Not Used Auto Programs
6
Auto Programs Not Used
7
Not Used Not Used
8
Not Used Power Level
9
Not Used Not Used
L
RELAY TEST
Remove the outer case and check voltage between Pin No 1and Pin No 3 of the 3
pin connector (A) on the control unit with an A.C. voltmeter.
The meter should indicate rated voltage, if not check oven circuit.
RY1,RY3 and RY4 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking
operation.
DC. voltage indicated ............. Defective relay.
DC. voltage not indicated ....... Check diode which is connected to the relay
coil. If diode is good, control unit is defective.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. 12.0V D.C. Oven lamp / Turntable motor
RY3 Approx. 12.0V D.C. High voltage transformer
RY4 Approx. 12.0V D.C. Fan motor
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