Sanyo EM-C1800MK, Service Manual

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6. TEST PROCEDURES AND TROUBLESHOOTING
CAUTION
-DISCONNECT THE POWER SUPPLY CORD FROM THE
WAL OUTLET WHENEVER REMOVING THE CABINET
FROM THE UNIT.
PROCEED WITH TESTS ONLY AFTER DISCHARGING
THE HIGH VOLTAGE CAPACITOR AND REMOVING THE
LEAD WIRES ON THE PRIMARY WINDING OF THE HIGH
VOLTAGE TRANSFOREMER. (SEE FIGURE 3)
A. TEST PROCEDURES
1) Check for resistance: Across the filament ter-
minal of the magnetron with an ohm - meter on
Rx1 scale.
2) Check for resistance: Between each filament
terminal of the magnetron and the chassis
ground with an ohm-meter on highest scale.
COMPONENT
MAGNETRON
HIGH-VOLTAGE
TRANSFORMER
1) Measure the resistance:
With an ohm-meter on R x1 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;
CHECKOUT PROCEDURE RESULT
Normal reading:
Less than 1 ohm.
Normal reading:
Infinite ohms.
Normal reading:
Approximately 1.0 ohms
Less than 1 ohm.
Approximately 60 ohms
Normal reading:
Infinite ohms.
Infinite ohms.
Note: Remove varnish of measured point.
Primary
windings
Secondary
Windings
Filament
Windings