Service manual

6
R-190HK
R-190HW
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
J KEY UNIT TEST
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.
1
2
3
45
6
7
89
0
POWER
LEVEL
EXPRESS
DEFROST
BAKED
POTATOES
FRESH
VEGETABLES
ROLLS&
MUFFINS
BEVERAGE
SOUP
POPCORN
CASSEROLE
TIMER
CLOCK
G 1 G 2 G 3 G 4 G 5 G 6
G 7
G 8
G 9
G10
STOP
CLEAR
START
MINUTE
PLUS
Pin
NO. G1
Pin
NO. G10
Key unit ribbon cable
Key unit (Membrane Switch) front view