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6. TEST PROCEDURES AND TROUBLESHOOTING
CAUTION
- DISCONNECT THE POWER SUPPLY CORD FROM THE WALL.
OUTLET WHENNEVER 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 TRANS-
FORMER FOR MAGNETRON.
(SEE FIGURE 3)
A. TEST PROCEDURES
COMPONENT
1) Check for resistance: Across the filament terminal
of the magnetron with an ohm-meter on Rx1 scale.
MAGNTRON
2) Check for resistance: Between each filament ter-
minal of the magnetron and the chassis ground
with an ohm-meter on highest scale.
1) Measure the resitance:
HIGH-VOLTAGE
with an ohm-meter on R x1 scale.
TRANSFORMER
b. Filament windund;
c. Secondary winding;
2) Measure the resistance:
with an ohm-meter on highest scale.
a) Primary winding to ground;
b) Filament winding to ground;
CHECOUT PROCEDURE
a. Primary winding;
Primary
winding
Normal reading:
Less than 1 ohms.
Figure 4
Normal reading:
Infinite ohms.
Figure 5
Normal reading:
Approximately 1.0 ohms.
Less than 1 ohms.
Approximately 60 ohms.
Normal reading:
Infinite ohms.
Infinite ohms.
Note:Remove varnish of mesured
point.
Figure 6
-4-
Secodary
winding
Filament
winding
RESULT
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