Sharp R-8000G, Руководство по обслуживанию

Страница: 26 / 52

R-8000G
24
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
To protect the electronic circuits, this model is provided with a fuse added to the primary on the PWB.
1. Fuse 1 check and repairs.
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) If the Fuse 1 is blown, replace power unit.
6) Make a visual inspection of the varistor. Check for burned damage. If the varistor has been burned, replace
the power unit.
7) Examine the touch control transformer with a tester for the presence of layer short-circuit (check the primary
coil resistance which is approximately 248
Ω ±
10%). If any abnormal condition is detected, replace the touch
control transformer.
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.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and repairs are
finished.
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) Follow the troubleshooting guide given below for repair.
STEPS OCCURRENCE CAUSE OR CORRECTION
1 The rated AC voltage is not present to power Check supply voltage and oven power cord.
terminal of CPU connecter (CN-D).
2 The rated AC voltage is present at primary Touch control transformer or secondary circuit defective.
side of touch control transformer. Check and replace touch control transformer, power
unit or CPU unit.
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.
X EXPRESS DEFROST TEST
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 SELECTA PROGRAM pad twice. And touch the SET pad.
(3) Enter weight by touching the number pad 3. (Example: 0.3 lbs steak)
(4) Touch the START pad.
(5) The oven is in Express Defrost cooking condition.
(6) The oven will operate as follows.
WEIGHT 1ST STAGE 2ND STAGE 3RD STAGE 4TH STAGE
Steaks/Chops
LEVEL TIME LEVEL TIME LEVEL TIME LEVEL TIME
0.3lbs 70% 16sec. 0% 16sec. 50% 21sec. 30% 21 sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
Y PROCEDURES TO BE TAKEN WHEN THE FUSE 1 ON THE PRINTED WIRING BOARD (PWB)
IS OPEN.