Test Procedures And Troubleshooting - Sanyo EM-D953 Service Manual

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 3 )
A. TEST PROCEDURE
COMPONENT
1) Check for resistance : Across the filament terminals of the
the magnetron with an ohmmeter on Rx1 scale.
2) Check for resistance : Across the filament terminals of
the magnetron and the chassis ground with an ohm-meter
on highest scale.
MAGNETRON
The chart below shows the firing times of the variable power
relay for the EM-D953 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.
Power Level
High (900W)
M-High(750W)
Roast (450W)
Simmer(300W)
Warm (150W)
Low (80W)
CHECKOUT PROCEDURE
Figure 5
Figure 6
On Time/s % On Time
(inc.'ramp up' time)
30.0
26
16
11
6
4
-5-
Filament Windings
Secondary Winding
Primary Windings
Figure 4
RESULTS
Normal reading :
Less than 1 ohm.
Normal reading :
Infinite ohms
100
87
53
37
20
13