iii
7. TEST PROCEDURES AND TROUBLESHOOTING
—
.
3
—,
CAUTION
t“
,.
Filament Windinqs
- DISCONNECT THE POWER SUPPLY
7H
1,.
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 4 )
A. TEST PROCEDURE
COMPONENT
MAGNETRON
-IIGH
JOLTAGE
tRANSFORMER
gs
CHECKOUT PROCEDURE
1) Check for resistance
: Across the filament terminals of the
the magnetron with an ohmmeter on Rxl scale.
F=l
2) Check for resistance : Across the filament terminals of
the magnetron and the chassis ground with an ohm-meter
on highest scale.
R
Figure 6
1) Measure the resistance:
With an ohmeter on
Rxl 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;
Figure 7
Figure 4
RESULTS
Normal reading :
Less than 1 ohm.
Normal reading :
Infinite
ohms
Normal readings :
Approximately 1.6 ohms
Less than 1 ohm.
Approximately 92 ohms.
Normal readings :
Infinite ohms
Infinite ohms
Note : Remove varnish of
measured point.
-6-
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