Sharp R-8000G, Service Manual

Page: 25 / 52

R-8000G
23
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
W SOLID-STATE RELAY TEST
Solid-state relay
2 1
4 3
1. Disconnect the power supply.
2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".
3. Open the door and block it open.
4. Discharge high voltage capacitor.
5. Disconnect the wire leads from the solid-state relay.
6. Measure the resistance between the terminals as described in the following table, with an ohmmeter.
Terminals Resistance
Between 1 and 2 Approx. 50M
Ω
Between 3 and 4 Approx. 1.3M
Ω
7. If the meter does not indicate above resistance, replace the solid-state relay.
8. Reconnect all leads removed from components during testing.
9. Re-install the outer case (cabinet).
10. Reconnect the power supply cord after the outer case is installed.
11. Run the oven and check all functions.
9. Replace the CPU unit or the control unit that has any
defective tact switches.
10. Assemble the control panel and reinstall it to the
oven.
11. Reconnect all leads removed from components
during testing.
12. Reinstall the outer case cabinet.
13. Reconnect the power supply cord after the outer
case is installed.
14. Run the oven and check all functions.
V RELAY TEST
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".
3. Open the door and block it open.
4. Discharge high voltage capacitor.
5. Disconnect the leads to the primary of the power transformer.
6. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
7. After that procedure, re-connect the power supply cord.
8. Remove the outer case and check voltage between Pin Nos. 1 and 9 of the 5 pin connector (CN-D) on the control
unit with an A.C. voltmeter. The meter should indicate 208 volts, if not check oven circuit.
Shut-off, Cook and Heater Relays Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation, high speed grill
or normal convection cooking condition.
DC . voltage indicated .................... Defective relay.
DC.
voltage not indicated ............ Check diode which is connected to the relay coil. If diode is good,
control unit is defective.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. 27.0V D.C. Oven lamp / Turntable motor
RY2 (COOK) Approx. 25.0V D.C. Power transformer
RY3 Approx. 25.0V D.C. Jet motor
RY5 Approx. 25.0V D.C. Fan motors
RY6 Approx. 25.0V D.C. Jet motor capacitor
9. Disconnect the power supply cord, and then remove outer case.
10. Open the door and block it open.
11. Discharge high voltage capacitor.
12. Reconnect all leads removed from components during testing.
13. Re-install the outer case (cabinet).
14. Reconnect the power supply cord after the outer case is installed.
15. Run the oven and check all functions.
<CONTROL UNIT (SWITCH UNIT)>
J6 J3 J5 J4 J2
J1
SP1
R11
R10
1.5K 1/4W
3.3K 1/4W
CN-J
10Pin
J7
J8
J10
J9
SW1-10
S10B-PH
START
(SW11)
1
11
6
16
2
12
7
17
3
13
8
18
4
14
9
19
5
15
0
20
(SW1)
CONVENIENCE
APPETIZERS
& SNACKS
(SW2)
(SW3)
(SW6)
(SW5)
(SW4)
(SW7)
(SW10)
(SW8)
(SW9)
SET
BAKED
GOODS
CONVENIENCE
MEAT, FISH
& POULTRY
BASIC
COOK
SELECTA
TIME
SELECTA
POWER
SELECTA
PROGRAM
CUSTOM
HELP
DOUBLE/
TRIPLEQTY
WH-A
SW11-23
(SW12) (SW13) (SW14)
(SW18)
(SW17)
(SW16)
(SW15)
(SW22) (SW21) (SW20)
(SW19)
(SW23)
OVEN READY
ON/OFF
STOP
CLEAR
MINUTEPLUS