Sharp R-1505F Service Manual page 20

R-1500
R-1501
R-1505
R-1506
PROCEDURE
LETTER
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.
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 indicators
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) Clock does not operate properly.
c) Cooking is not possible.
When testing is completed,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Reconnect all leads removed from components during testing.
5) Re-install the hood intake duct R.
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. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the control panel assembly.
5. 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.
6. Reconnect
removed from components
during testing.
7. Re-install the control panel
assembly.
8. Reconnect the power
supply cord.
9. Run the oven and check all
functions.
TEST PROCEDURES
COMPONENT TEST
all leads
G 8
POPCORN
KEEP
WARM
KEY UNIT
18
G 7 G 6 G 5
REHEAT
FRESH
2
RICE
CENTER VEGETABLES
GROUND GROUND
FROZEN
4
MEAT MEAT
ENTREES
(DEFROST CENTER) (COOK CENTER)
POULTRY FROZEN STEAKS /
7
BONELESS VEGETABLES CHOPS
POWER BAKED POULTRY
1
LEVEL POTATOES BONE-IN
G 4 G 3 G 2 G 1
HOT LIGHT
3
WATER HI / LO
FAN
5 6
HI / LO
STOP
8 9
CLEAR
START
TIMER
0
MINUTE
CLOCK
PLUS