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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 THE
TESTS ONLY AFTER DISCHARGING THE HIGH
VOLTAGE CAPACITOR AND REMOVING THE LEAD
WIRES FROM THE PRIMARY WINDING OF THE
HIGH VOLTAGE TRANSFORMER. (SEE FIGURE 3)
A. TEST PROCEDURES
COMPONENT
1) Check for resistance : Across the filament
MAGNETRON
2) Check for resistance : Between each filament
1) Measure the resistance :
2) Measure the resistance :
HIGH-VOLTAGE
TRANSFORMER
Note : Remove varnish of
CHECKOUT PROCEDURE
terminals of the Magnetron with an
Ohm-Meter on R x 1 scale.
Ohm-Meter
terminal of the Magnetron and the chassis
ground with an Ohm-Meter on highest scale.
Ohm-Meter
With an Ohm-Meter on R x 1 scale.
a.
Primary winding :
b.
Filament winding :
c.
Secondary winding :
With an Ohm-Meter on highest scale.
a.
Primary winding to ground.
b
Filament winding to ground.
Ohm-Meter
measured point.
Secondary
Windings
Normal reading :
Figure 4
Normal reading :
Figure 5
Normal readings :
Normal readings :
Figure 6
- 4 -
Filament Windings
Primary
Windings
Figure 3
RESULT
Less than 1 Ohm.
Infinite Ohms.
Approximately 1.53 Ohms.
Less than 1 Ohm.
Approximately 97.2 Ohms.
Infinite Ohms.
Infinite Ohms.
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