Sharp Carousel R-350F Manual de serviço - Página 14

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R-350F
PROCEDURE
LETTER
1. Key Unit. Note: Check key unit ribbon connection before replacement.
The following symptoms indicate a defective key unit. Replace the key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
2. Control Unit.
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure L) 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 troubles 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.
L
KEY UNIT TEST
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 2nd. interlock relay control switch operates properly; that is the
contacts are closed when the door is closed and open when the door is open.
If the door 2nd. interlock relay control switch is good, disconnect the flat ribbon cable that connects
the key unit to the control unit and make sure the 2nd. interlock relay control switch is closed (either
close the door or short the 2nd. interlock relay control switch connector). 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.
CARRY OUT 3D CHECKS.
M
RELAY TEST
Remove the outer case and check voltage between Pin No 1 of the 2-pin connector (A) and the normal
open terminal of the relay RY1 on the power unit with an A.C. voltmeter. The meter should indicate
230 - 240 volts, if not check oven circuit.
TEST PROCEDURES
COMPONENT TEST
G 1
G 2
G 3
DINNER
PIZZA
PLATE
EXPRESS
EXPRESS
VEGETABLES
MEAL
COOK
EASY
FROZEN
CASSEROLE
DEFROST
DINNER
PASTA
SOUP
PIE
MEAL
12
G 4
G 5
G 6
1
2
3
6
7
8
INSTANT COOK
TIMER CLOCK
START
POWER
MORE
LESS
LEVEL
RICE/
BEVERAGE
PASTA
G 7
G 8
4
5
G 9
9
0
G10
EXPRESS
G11
DEFROST
STOP
HELP
G12
CLEAR
G13
G14