R-22GT-F
R-22GV-F
17
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
8) Run the oven and check all functions.
2. Control Unit
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure M) to determine if control unit is faulty.
Re-connect the power supply cord. And check for followings.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with display
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Cooking is not possible.
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 two high voltage capacitors.
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 two high voltage capacitors.
4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is
making good contact, verify that the door sensing switch (stop switch) operates properly; that is the
contacts are closed when the door is closed and open when the door is open. If the door sensing switch
(stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and
make sure the door sensing switch is closed (either close the door or short the door sensing switch
connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire
between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control unit
responds by clearing with a beep
the key unit is faulty and must be
replaced. If the control unit does
not respond, it is faulty and must be
replaced. If a specific pad does not
respond, the above method may
be used (after clearing the control
unit) to determine if the control unit
or key pad is at fault.
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.
M
KEY UNIT TEST
1
11
13
15
19
12
14
16
20
17
18
3
4
5
6
7
8
9
0
G 8
G 7
G 6
G 5
G 4
G 3
G 2
G 1
G 9
G 10
G 11
G 12
2
DOUBLE
QUANTITY
EXPRESS
DEFROST
SELECTA
TIME
SELECTA
POWER
STOP /
CLEAR
START
SET
CHECK
SIGNAL
1
3
4
5
6
7
8
9
0
G 8
G 7
G 6
G 5
G 4
G 3
G 2
G 1
G 9
G 10
G 11
G 12
2
DOUBLE
QUANTITY
EXPRESS
DEFROST
SELECTA
TIME
STOP /
CLEAR
START
SET
CHECK
SIGNAL
R-22GV-F
R-22GT-F
