Sharp R-405DK, Service Manual

16

R - 4 0 5 D K

WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " steaks / chops " pad once.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows

1ST STAGE

2ND STAGE

WEIGHT

LEVEL

TIME

LEVEL

TIME

0.5lb

70%

30sec.

40%

15sec.

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.

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT 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. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation

tape.

6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the

common terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.

RY1 and RY2 Relay 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.

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. 11.8V D.C.

Oven lamp / Turntable motor / Cooling fan motor

RY2

Approx. 10.7V D.C.

Power transformer

  8. Disconnect the power supply cord, and then remove outer case.
  9. Open the door and block it open.
10. Discharge high voltage capacitor.
11. Reconnect all leads removed from components during testing.
12. Re-install the outer case (cabinet).
13. Reconnect the power supply cord after the outer case is installed.
14. Run the oven and check all functions.

L

COMPU DEFROST TEST

                                               Key Unit

K

RELAY TEST

G 9

G 8

5 

4 

3 2 1 

0 9 8 7 6 

G 7

G 6

G 5

G 4

G 3

G 2

G 1

G10

G11

G12

G13

G14

FRESH

VEGETABLES

ROLLS &

MUFFINS

COMPU

DEFROST

BAKED

POTATOES

MINUTE

PLUS

CASSEROLE POPCORN

POWER

LEVEL

START

STOP

CLEAR

BEVERAGE

TIMER

CLOCK