16
R - 320HK
R- 320HQ
R-320HW
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
3. If the Key unit or the Control unit is defective.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Replace the Control unit assembly.
5) Reconnect all leads removed from components during testing.
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.
4. When testing is completed,
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Reconnect all leads removed from components during testing.
5) Re-install the outer case (cabinet).
6) Reconnect the power supply cord after the outer case is installed.
7) Run the oven and check all functions.
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4.
Using an ohmmeter and referring to the key unit matrix indicated on the control unit circuit, check the circuit
between the pins of the key unit that correspond to the STOP/CLEAR pad. When the pad is pressed, the
ohmmeter should indicate short circuit. When the pad is released, the ohmmeter should indicate open
circuit. If incorrect readings are obtained, the key unit is faulty and must be replaced. About the other pads,
the above method may be used.
5. Reconnect all leads removed from components during testing.
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.
J
KEY UNIT TEST
K
RELAY TEST
G1
3
G1
2
G1
1
G1
0
G9
G8
G7
G5
G4
G3
G2
G1
G6
5
0
6
9
4
3
8
7
2
1
BEVERAGE
ROLLS/
MUFFINS
GROUND
MEAT
SENSOR
COOK
STEAKS/
CHOPS
HOT
WATER
BONELESS
POULTRY
BONE-IN
POULTRY
KEEP
WARM
TIMER
CLOCK
STOP
CLEAR
POWER
LEVEL
CUSTOM
HELP
SENSOR
REHAET
START
MINUTE PLUS
POPCORN
Pin
NO. G1
Pin
NO. G13
Key unit ribbon cable
Key unit (Membrane Switch) front view
1. Disconnect the power supply cord, and then remove outer case.
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 the normal open terminal of the relay RY1 and the
normal open terminal of the relay RY2 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
