Daewoo KOR-3000 Service Manual download pdf (Page 46)

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 29).

COMPONENT TEST PROCEDURE

1. High voltage transformer

(A) Remove connections from the transformer termi-

nals and check continuity.

(B) Normal readings should be as follows:

Secondary winding ..........Approx. 120.0Ω ± 10%

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.

ity.

(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 disconnecting

the leads.

(B) With the ohmmeter set on the highest resistance

scale, measure the resistance across the diode

terminals.

Reverse the meter leads and again 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. A nor-

mal diodes resistance will be infinite in one direc-

tion and several hundred KΩ in the other direction.

4. Magnetron

For complete magnetron diagnosis, refer to

“Measurement of the Microwave Output Power”.

(Page 24) Continuity checks can only indicate and

open filament or a shorted magnetron. To diag-

nose for an open filament or shorted magnetron.

(A) Isolate magnetron from the circuit by disconecting

the leads.

(B) A continuity check across magnetron filament ter-

minals should indicate ohm or less.

and magnetron case should read open.

5. Interlock monitor switch

The interlock switch can be checked with an ohm-

meter. 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 openn 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 replace-

ment.

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Daewoo KOR-3000 Service Manual Page 46

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