Safety Interlock Continuity Test - Daewoo KOR-61A52S Service Manual

SAFETY INTERLOCK CONTINUITY TEST

• Disconnect the oven from the power supply.
• You can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter.
• The switch operation is checked by the lamp on/off of resistance zero/unlimited.
• The sequence of check is interlock monitor switch; primary and secondary interlock switches check.
• Make circuits like Fig. a, Fig. b, Fig. c for tests.
1) In case of interlock monitor check.
(Lamp on or zero resistance)
POWER
SUPPLY
CORD
(ohmmeter)
– Fig. a –
Condition: 1) Door is opened.
2) Common terminal of the monitor
switch disconnected.
3) In case of secondary interlock switch.
POWER
SUPPLY
CORD
(ohmmeter)
– Fig. c –
Condition : 1) Door is closed.
PRIMARY
INTERLOCK S/W
NO
INTERLOCK
MONITOR
COM
S/W
NC
SECONDARY
INTERLOCK
S/W
PRIMARY
INTERLOCK S/W
NO
INTERLOCK
MONITOR
COM
S/W
NC
SECONDARY
INTERLOCK
S/W
2) In case of primary interlock check.
(Lamp on or zero resistance)
POWER
SUPPLY
CORD
(ohmmeter)
– Fig. b –
Condition: 1) Door is closed.
ƒN(Schematic diagram of S/W tester)
CONTACT
LEAD
26
PRIMARY
INTERLOCK S/W
NO
INTERLOCK
MONITOR
COM
S/W
NC
SECONDARY
INTERLOCK
S/W
LAMP
S/W
BATTERY