LG RCS511A Service Manual - Page 25

Component Test Procedure

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COMPONENT TEST PROCEDURE CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1) 2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN. COMPONENTS HIGH VOLTAGE TRANSFORMER (Wire leads removed) TEST PROCEDURE RESULTS SECONDARY TERMINAL FILAMENT WINDING MAGNETRON (Wire leads removed) PRIMARY TERMINAL 1. Measure the resistance. (Ohm-meter scale: Rx1 and Rx100) ¥ Primary winding ¥ Secondary winding ¥ Filament winding 2. Measure the resistance. (Ohm-meter scale: Rx1000) ¥ Primary winding to ground ¥ Filament winding to ground Approx.: 1.81 ~ 2.4 ohm Approx.: 100 ~ 125 ohm Less than: 1 ohm Normal: Infinite Normal: Infinite 1. Measure the resistance. (Ohm-meter scale: Rx1) ¥ Filament terminal 2. Measure the resistance. (Ohm-meter scale: Rx1000) ¥ Filament to chassis Normal: Less than 1 ohm Normal: Infinite 5-8

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5-8
CAUTIONS
1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE
OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH
VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE
HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)
2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER
OF WATER IN CONTAINER) IN THE OVEN.
COMPONENTS
TEST PROCEDURE
RESULTS
HIGH VOLTAGE
TRANSFORMER
(Wire leads removed)
MAGNETRON
(Wire leads removed)
1. Measure the resistance.
(Ohm-meter scale: Rx1 and Rx100)
¥ Primary winding
¥ Secondary winding
¥ Filament winding
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
¥ Primary winding to ground
¥ Filament winding to ground
1. Measure the resistance.
(Ohm-meter scale: Rx1)
¥ Filament terminal
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
¥ Filament to chassis
Approx.:
1.81
~
2.4
ohm
Approx.:
100
~
125
ohm
Less than: 1 ohm
Normal: Infinite
Normal: Infinite
Normal: Less than 1 ohm
Normal: Infinite
COMPONENT TEST PROCEDURE