Dacor DMT2420S - Page 19

17
DMT2420B
DMT2420R
DMT2420S
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the common
terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 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. 24.0V D.C. Oven lamp / Turntable motor / Cooling fan motor
RY2 Approx. 23.0V D.C. Power transformer
8. Disconnect the power supply cord, and then remove outer case.
9. Open the door and block it open.
10.Discharge high voltage capacitor.
11.Reconnect all leads removed from components during testing.
12.Re-install the outer case (cabinet).
13.Reconnect the power supply cord after the outer case is installed.
14.Run the oven and check all functions.
J RELAY TEST
WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the Defrost pad and select 6 Choices. Then select Steaks/Chops/Fish.
(Now, weight 0.5lb is set.) And then touch the start pad.
(3) The oven is in Defrost cooking condition.
(4) The oven will operate as follows
K COMPU DEFROST TEST
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
G 5
G 1
SETUP
PASTA
GRAINS
DEFROST
F
R
O
ZEN
FOO
D
EASY
MI
N
U
TE
STAR
T
TOUCH SCREEN
K
EY
UNIT
PO
PC
OR
N
MEAT
S
STOP
CL
E
AR
MICROWAVE
RECIPES &
INSTRUCTIONS
FI
S
H
SEAFOOD
R
EHEAT
BEVERAGES
VEGETA
BLES
B
A
K
E
D
POT
AT
OES
PO
ULTR
Y
G 2
G 3
G14
G 7
G 8
G 9
G10
G14
G6
G1
3
G1
2
G1
1
G1
5