Garland EM-C180 User Manual download pdf (Page 6)

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6. TEST PROCEDURES AND TROUBLESHOOTING

CAUTION

-DISCONNECT THE POWER SUPPLY CORD FROM THE WALL

OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT.

PROCEED WITH TESTS ONLY AFTER DISCHARGING THE HIGH

VOLTAGE CAPACITORS AND REMOVING THE LEAD WIRES ON

THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORM-

ERS FOR LOWER AND UPPER MAGNETRONS.

(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.

Figure 4

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.

Note: Remove varnish of measured point.

PRIMARY

WINDINGS

Secondary

Windings

Filament

Windings

Figure 3

Figure 5

Figure 6

1 2 3 4 5 6 7 8 9 10 11 ... 27 28

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Garland EM-C180 User Manual Page 6

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