A. TEST PROCEDURES
COMPONENT
CHECKOUT PROCEDURE
RESULT
1) Check for resistance : Across the filament
Normal reading :
terminals of the Magnetron with an
Less than 1 Ohm.
Ohm-Meter on R x 1 scale.
2) Check for resistance : Between each
Normal reading :
filament terminal of the Magnetron and
Infinite Ohms.
the chassis ground with an Ohm-Meter
on highest scale.
1) Measure the resistance :
Normal readings :
With an Ohm-Meter on R x 1 scale.
a . Primary winding :
Approximately 0.75 Ohms.
b . Filament winding :
Less than 1 Ohm.
c . Secondary winding :
Approximately 167.5 Ohms.
2) Measure the resistance :
Normal readings :
With an Ohm-Meter on highest scale.
a . Primary winding to ground :
Infinite Ohms.
b . Filament winding to ground :
Infinite Ohms.
NOTE
: Remove varnish of
measured point.
Filament Windings
Primary
Windings
Secondary
Windings
6. TEST PROCEDURES AND TROUBLESHOOTING
Figure 3
Figure 4
Figure 5
Figure 6
Ohm-Meter
Ohm-Meter
Ohm-Meter
- 4 -
HIGH-VOLTAGE
TRANSFORMER
MAGNETRON
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)
