Goldstar MVH1615WW, Руководство по обслуживанию

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7-15
TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING
A. TEST PROCEDURES
- CAUTIONS -
- DISCONNECT THE POWER SUPPLY CORD
FROM THE WALL OUTLET WHENEVER
REMOVINGING THE CABINET FROM THE UNIT.
PROCEED WITH THE TESTS ONLY AFTER
DISCHARGING THE HIGH VOLTAGE
CAPACITOR AND REMOVING THE WIRE LEADS
FROM THE PRIMARY WINDING OF THE HIGH
VOLTAGE TRANSFORMER. (SEE FIGURE 23)
- ALL OPERATIONAL CHECKS WITH
MICROWAVE ENERGY MUST BE DONE WITH A
LOAD (1 LITER OF WATER IN CONTAINER) IN
THE OVEN.
Primary
Winding
Secondary
Winding
Filament
Winding
COMPONENTS TEST PROCEDURES RESULTS
NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS
SERVICED FOR ANY REASON.
MAGNETRON
(Wire leads are
removed)
HIGH-VOLTAGE
TRANSFORMER
(Wire leads are
removed)
1) Measure the resistance: Across the
filament terminals of the magnetron
with an ohm-meter on Rx1 scale.
2) Measure the resistance: Between each
filament terminal of the magnetron and
the chassis ground with an ohm-meter
on high test scale.
1) Measure the resistance:
With an ohm-meter on Rx1 scale.
a. Primary winding;
b. Filament winding;
c. Secondary winding;
2) Measure the resistance:
With an ohm-meter on highest scale.
a. Primary winding to ground;
b. Filament winding to ground;
Normal reading:
Less than 1 ohm.
Normal reading:
Infinite ohms.
NOTE: Replace the magnetron, if the
magnetron checks and all of the high
voltage component tests are good, but
the unit still does not heat a load.
Normal readings:
Approx. 0.3 to 0.5 ohm.
Less than 0.1 ohm.
Approx. 65 to 120 ohms.
Normal readings:
Infinite ohms.
Infinite ohms.
Figure 23