Sharp R-25JT-F User Manual

R-25JT-F
15
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 two high voltage capacitors.
4. Before performing this test, make sure that the secondary interlock switches (1), (2) and the primary
interlock relays RY2, RY3 are operating properly, according to the above Switch Test Procedure.
Disconnect the wire lead from the monitor switches (1), (2) (COM) terminals. Check the monitor switches
(1), (2) operation by using the ohmmeter as follows. When the door is open, the meter should indicate a
closed circuit. When the monitor switch actuator is pushed by a screw driver through the upper latch hole
on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch
is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may
be defective. After testing the monitor switches, reconnect the wire lead to the monitor switch (COM)
terminals and check the continuity of
the monitor circuit.
5. Reconnect all leads removed from
components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after
the outer case is installed.
8. Run the oven and check all functions.
8. Run the oven and check all functions.
NOTE:If the door sensing switch contacts fail in the open position and the door is closed, the blower
motor, stirrer motors and oven light will be activated by RY1.
PRIMARY INTERLOCK RELAY (RY2, RY3)
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge two high voltage capacitors.
4. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay RY2 and/or RY3.
Check the state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay
contacts are closed, replace the circuit board entirely or the relay itself.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
G MONITOR SWITCH (1) AND/ OR (2) TEST
SCREW DRIVER
MONITOR SWITCH (2)
OHMMETER
MONITOR SWITCH (1)
LATCH HOOK
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge two high voltage capacitors.
4. Isolate switch and check the contacts by using an ohmmeter with following table. If improper operation is
indicated, make the necessary switch adjustment or replacement.
Table: Switch Connection
Plunger operation Between COM. and NO. Between COM. and NC. COM.: Common terminal
Plunger released Open circuit Close circuit NO.: Normal Open terminal
Plunger operation Close circuit Open circuit NC.: Normal Close terminal
H VOLTAGE SELECT SWITCHES TEST
5. Reconnect all leads removed from components
during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer
case is installed.
8. Run the oven and check all functions.
Select switch (1)
Select
switch (2)
Select switch (3)
COM.
N.C.
N.O
Select switch angle
Switch
spacer
Screw
Oven
cavity
Rear
cabinet
side

Sharp R-25JT-F Specifications

General

Brand	Sharp
Model	R-25JT-F
Category	Microwave Oven
Language	English