COMPONENT CHECKOUT PROCEDURE RESULTS
1) Check for resistance : Across the filament terminals of the Normal reading :
the magnetron with an ohmmeter on Rx1 scale.
Less than 1 ohm.
2) Check for resistance : Across the filament terminals of
Normal reading :
the magnetron and the chassis ground with an ohm-meter
Infinite ohms
on highest scale.
The chart below shows the firing times of the variable power
relay for the EM-D9550 model. The table should be used as
a means to check the magnetron is operating correctly and
producing any other power setting apart from full power.
7. 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 4 )
Figure 4
A. TEST PROCEDURE
MAGNETRON
Figure 5
Figure 6
-5-
Filament Windings
Primary Windings
Secondary Winding
Power Level
On Time/s
% On Time
(inc.’ramp up’ time)
High
(900W)
30.0
100
M-High(750W)
28.0
93
Roast (450W)
18.0
60
Simmer(300W)
13.0
43
Warm (150W)
8.0
27
Low
(80W)
6.0
20
