7-15
- CAUTIONS -
- DISCONNECT THE POWER SUPPLY CORD
FROM THE WALL OUTLET WHENEVER
REMOVINGING THE CABINET FROM THE UNIT.
PROCEED WITH THE TESTS ONLY AFTER
DISCHARGING THE HIGH VOLTAGE CAPACITOR
AND REMOVING THE WIRE LEADS FROM THE
PRIMARY WINDING OF THE HIGH VOLTAGE
TRANSFORMER. (SEE FIGURE 27)
- ALL OPERATIONAL CHECKS WITH MICROWAVE
ENERGY MUST BE DONE WITH A LOAD (1 LITER
OF WATER IN CONTAINER) IN THE OVEN.
A. TEST PROCEDURES
COMPONENTS
TEST PROCEDURES
RESULTS
MAGNETRON
(Wire leads are
removed)
HIGH-VOLTAGE
TRANSFORMER
(Wire leads are
removed)
1) Measure the resistance: Across the
filament terminals of the magnetron
with an ohm-meter on Rx1 scale.
2) Measure the resistance: Between
each filament terminal of the
magnetron and the chassis ground
with an ohm-mater on high test scale.
1) Measure the resistance:
With an ohm-meter on Rx1 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;
Normal reading:
Less than 1 ohm.
Normal reading:
Infinite ohms.
NOTE: Replace the magnetron, if the
magnetron checks and all of the
high voltage component tests are
good, but the unit still does not heat
a load.
Normal readings:
Approx. 0.3 to 0.5 ohm.
Less than 0.1 ohm.
Approx. 65 to 120 ohms.
Normal readings:
Infinite ohms.
Infinite ohms.
NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS
SERVICED FOR ANY REASON.
Primary
Winding
Secondary
Winding
Filament
Winding
Figure 27
TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING
Summary of Contents for MV-1525B
Page 37: ...8 1 EXPLODED VIEW DOOR PARTS 1000 1008 1002 1001 1006 1005 1007 1004 1003 W105 ...
Page 38: ...8 2 CONTROLLER PARTS 2000 2005 2001 2003 2002 2004 2007 W083 2010 ...
Page 40: ...8 4 LATCH BOARD PARTS 4001 4002 4001 4003 4000 W030 ...
Page 44: ...8 15 SCHEMATIC DIAGRAM OF P C B ...
Page 45: ...8 16 PRINTED CIRCUIT BOARD ...
