Noise Filter Test; Relay Test - Wolf SUB-ZERO MC24 Service Manual

MC24
PROCEDURE
LETTER
O

NOISE FILTER TEST

Disconnect the oven from power supply.
Disconnect the lead wires from the terminal the noise filter. Using
an ohmmeter, check between the terminals as described in the
following table.
Between N and H
Between terminal N and GRAY
Between terminal H and RED
If incorrect reading are obtained, replace the noise filter.
P

RELAY TEST

Remove the outer case and check voltage between Pin Nos. 7 and 9 of the 9- pin connector (A) on
the control unit an A.C. voltmeter. The meter should indicate 120 volts, if not check the oven circuitry.
Shut-off, Cook and Heater 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 or convec-
tion 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
RELAY SYMBOL
Q AUTO DEFROST TEST
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch "AUTO DEFROST" pad, then number pads "1" and "5" (Defrost, Ground Meat,
0.5lbs). Finally touch the "START" pad..
(3) After 2 sec. Now the oven is in AUTO DEFROST cooking condition.
(4) The oven will operate as follows.
WEIGHT
0.5lbs
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
TEST PROCEDURES
MEASURING POINT
OPERATIONAL VOLTAGE
RY1 Approx. 19.0V D.C.
RY2(COOK) Approx. 18.0V D.C.
RY3(HEATER) Approx. 18.0V D.C.
RY4 Approx. 19.0V D.C.
RY5 Approx. 19.0V D.C.
RY6 Approx. 19.0V D.C.
1ST STAGE
LEVEL TIME
70% 47sec.
COMPONENT TEST
INDICATION OF OHMMETER
Open circuit.
Short circuit.
Short circuit.
unit is defective.
Oven lamp / Turntable motor
Power transformer
Heating element
Damper motor
Convection motor
Cooling fan motor
2ND STAGE 3RD STAGE
LEVEL TIME LEVEL
0% 52sec. 50%
22
NOISE FILTER
N
NOISE SUPPRESSION COIL
LINE CROSS CAPACITOR
0.22µF / AC 250V
LINE BYPASS LINE BYPASS
CAPACITOR CAPACITOR
0.0033µF / AC 125V 0.0033µF / AC 125V
GRY
CONNECTED COMPONENTS
4TH STAGE
TIME LEVEL TIME
32sec. 30% 40sec.
H
FUSE 20A
RED