Sanyo EM-C1100SD, Service Manual

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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 CHECOUT PROCEDURE RESULT
MAGNTRON
1) Check for resistance: Across the filament terminal
of the magnetron with an ohm-meter on Rx1 scale.
Normal reading:
Less than 1 ohms.
2) Check for resistance: Between each filament ter-
minal of the magnetron and the chassis ground
with an ohm-meter on highest scale.
Normal reading:
Infinite ohms.
HIGH-VOLTAGE
TRANSFORMER
1) Measure the resitance:
with an ohm-meter on R x1 scale.
a. Primary winding;
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;
Normal reading:
Approximately 1.0 ohms.
Less than 1 ohms.
Approximately 60 ohms.
Normal reading:
Infinite ohms.
Infinite ohms.
Figure 6
Note:Remove varnish of mesured
point.
Figure 4
Figure 5
Primary
winding
Secodary
winding
Filament
winding