Daewoo KOR-616T2S, Руководство по обслуживанию, Страница: 39 / 56

38
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)
(ohmmeter)
– Fig. a –
Condition: 1) Door is opened.
2) Common terminal of the monitor
switch disconnected.
3) In case of secondary interlock switch.
(ohmmeter)
– Fig. c –
Condition: 1) Door is closed.
2) In case of primary interlock check.
(Lamp on or zero resistance)
(ohmmeter)
– Fig. b –
Condition: 1) Door is closed.
* (Schematic diagram of S/W tester)
POWER
SUPPLY
CORD POWER
SUPPLY
CORD
PRIMARY
INTERLOCK S/W PRIMARY
INTERLOCK S/W
NO NO
COM COM
NC
NC
INTERLOCK
MONITOR
S/W
INTERLOCK
MONITOR
S/W
SECONDARY
INTERLOCK
S/W SECONDARY
INTERLOCK
S/W
POWER
SUPPLY
CORD
PRIMARY
INTERLOCK S/W
NO
COM
NC
INTERLOCK
MONITOR
S/W
SECONDARY
INTERLOCK
S/W
CONTACT
LEAD
LAMP
S/W
BATTERY