Component Test Procedure - Daewoo KOR-616T2S Service Manual

COMPONENT TEST PROCEDURE

1. High voltage is present at the high voltage terminal of the high voltage transformer during any cooking
cycle.
2. It is neither necessary nor advisable to attempt measurement of the high voltage.
3. Before touching any oven components or wiring, always unplug the oven from its power source and
discharge the capacitor (see page 26).
1. High voltage transformer
(A) Remove connections from the transformer
terminals and check continuity.
(B) Normal readings should be as follows:
Secondary winding.............................................
........................Approx 120Ω±10%(KOR-816T)
.......................Approx. 100Ω±10%(KOR-616T)
Filament winding .............................Approx. 0Ω
Primary winding...............................Approx. 0Ω
2. High voltage capacitor
(A) Check continuity of capacitor with meter on the
highest OHM scale.
(B) A normal capacitor will show continuity for a
short time, and then indicate 9MΩ once the
capacitor is charged.
(C) A shorted capacitor will show continuous
continuity.
(D) An open capacitor will show constant 9MΩ.
(E) Resistance between each terminal and
chassis should be infinite.
3. High voltage diode
(A) Isolate the diode from the circuit by disconnec-
ting the leads.
(B) With the ohmmeter set on the highest
5. Interlock monitor switch
The interlock switch can be checked with an ohmmeter. Isolate the switch and then connect the meter
leads to the common (COM) and normally close (NC) terminals of the switch. The meter should
indicate an open circuit with the door closed and a closed circuit with the door opened.
6. Primary and secondary interlock switch
The primary and secondary interlock switch can be checked with an ohmmeter. Isolate the switch and
connect the meter leads to the common (COM) and normally open (NO) terminals of the switch. The
meter should indicate an open circuit with the door opened and a closed circuit with the door closed. In
case improper operation is indicated, make the necessary switch adjustment or replacement.
resistance scale, measure the resistance
across the diode terminals.
Reverse the meter leads and agin observe the
resistance reading. Meter with 6V, 9V or higher
voltage batteries should be used to check the
front-back resistance of the diode, otherwise
an infinite resistance may be read in both
directions. Anormal diodes resistance will be
infinite in one direction and several hundred
KΩ inthe other direction.
4. Magnetron
For complete magnetron diagnosis, refer to
"Measurement of the Microwave Output
Power". (Page 19) Continuity checks can only
indicate and open filament or a shorted
magnetron. To diagnose for an open filament or
shorted magnetron.
(A) Isolate magnetron from the circuit by
disconecting the leads.
(B) A continuity check across magnetron filament
terminals should indicate ohm or less.
(C) A continuity check between each filament
terminal and magnetron case should read
open.
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