Component Test Procedure - Daewoo KOR-122M0A Service Manual

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Table Of Contents

Table of Contents

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. 100Ω±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.

(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 normal diodes resistance will be

infinite in one direction and several hundred KΩ

in the other direction.

4. Magnetron

For complete magnetron diagnosis, refer to

"Measurement of the Microwave Output Power".

(Page 20) 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.

terminal and magnetron case should read

open.

5. Fuse

If the fuse in the primary monitor switch circuit is

blown when the door is opened, check the

primary interlock switch and monitor switch

before replacing the blown fuse. In case the fuse

is blown by an improper switch operation,

replace the defective switch and fuse at the

same time. Replace just the fuse if the switches

operate normally.

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CAUTION: REPLACE BLOWN FUSE

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WITH 20 AMPERE FUSE.

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