Sharp KB-3300JS Service Manual - Page 29

High Voltages Are Present At The High Voltage Terminal, So Do Not Attempt

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PROCEDURE LETTER M TEST PROCEDURES BLOWN MONITOR FUSE TEST COMPONENT TEST KB-3300JS KB-3300JK KB-3300JW 1. Disconnect the power supply cord. 2. Open the drawer and block it open. 3. To discharge high voltage capacitor, wait for 60 seconds. 4. If the monitor fuse is blown when the drawer is opened, check the primary interlock switch, secondary interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse. CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE SECONDARY INTERLOCK SWITCH, STOP SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA018/KIT, even if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch. 5. Reconnect all leads removed from components during testing. 6. Reassemble the unit. 7. Reconnect the power supply cord. 8. Run the oven and check all functions. N POWER TRANSFORMER TEST 1. Disconnect the power supply cord. 2. Open the drawer and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 90 ohms; the resistance of the filament coil should be less than 1 ohm. 5. Reconnect all leads removed from components during testing. 6. Reassemble the unit. 7. Reconnect the power supply cord. 8. Run the oven and check all functions. (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) O FAILURE CODES The following failure codes will be displayed on the Control Panel. EE 6 (displayed when oven starts) - Oven Thermistor is open. Check thermistor or control unit. EE 7 (displayed when oven starts) - Oven Thermistor is shorted. Check thermistor or control unit. EE L (displayed after 1 minute of cooking or self cleaning) - Lower door lock error. Check lock motor, lock switch (RY 8) or control unit. SPECAIL FAILURE NOTE: During the Microwave Drawer operation, if it goes dead, check each Thermal Cut-out first. This is due to the whole control unit being powered by Line L1 (refer to Schematic on page 13). 27

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27
KB-3300JS
KB-3300JK
KB-3300JW
EE 6
(displayed when oven starts)
-
Oven Thermistor is open.
Check thermistor or control unit.
EE 7
(displayed when oven starts)
-
Oven Thermistor is shorted.
Check thermistor or control unit.
EE L
(displayed after 1 minute of cooking or self cleaning)
-
Lower door lock error.
Check lock motor, lock switch (RY 8) or control unit.
SPECAIL FAILURE NOTE:
During the Microwave Drawer operation, if it goes dead, check each Thermal Cut-out first.
This is due to the whole control unit being powered by Line L1 (refer to Schematic on page 13).
O
FAILURE CODES
The following failure codes will be displayed on the Control Panel.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
N
POWER TRANSFORMER TEST
1.
Disconnect the power supply cord.
2.
Open the drawer and block it open.
3.
Discharge high voltage capacitor.
4.
Disconnect the primary input terminals and measure the resistance of the transformer with an
ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of
the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be
approximately 90 ohms; the resistance of the filament coil should be less than 1 ohm.
5.
Reconnect all leads removed from components during testing.
6.
Reassemble the unit.
7.
Reconnect the power supply cord.
8.
Run the oven and check all functions.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
1.
Disconnect the power supply cord.
2.
Open the drawer and block it open.
3.
To discharge high voltage capacitor, wait for 60 seconds.
4.
If the monitor fuse is blown when the drawer is opened, check the primary interlock switch, secondary
interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before
replacing the blown monitor fuse.
CAUTION:
BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE SECONDARY INTERLOCK
SWITCH, STOP SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.
If the monitor fuse
is blown by improper switch operation, the monitor fuse and monitor switch must
be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA018/KIT, even if the
monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a
20 ampere fuse and switch.
5.
Reconnect all leads removed from components during testing.
6.
Reassemble the unit.
7.
Reconnect the power supply cord.
8.
Run the oven and check all functions.
M
BLOWN MONITOR FUSE TEST