R-8470
-8570
LATCH
MONITOR
SWITCH
LEVER
If the monitor fuse in the primary-secondary-monitor switch circuit is blown when the door is
opened, check the primary and secondary interlock switches and monitor switch according to the
Test Procedure of those switches, before replacing the blown monitor fuse.
If the monitor fuse is blown by improper switch operation, adjust or replace the defective switch
and monitor fuse at the same time.
Replace just the monitor fuse if the switches operate normally.
CAUTION; REPLACEMENT FUSE MUST BE THE LISTED FUSE IN PARTS LIST.
A continuity check across the temp. fuse terminal should indicate a closed circuit.
If the temperature of the magnetron reaches 115
temp. fuse opens. If the temp. fuse has
opened, replace the fuse. An open temp. fuse indicates overheating of the magnetron assembly.
Check for restricted air flow to the magnetron through the opening in the chassis, especially the
cooling duct.
Make sure the heating element is fully cooled and test as follows;
a. Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale, the
resistance between the heating element terminals should be approximately 38.4 ohms.
b. Disconnect wire leads and measure the insulation resistance with 500V 1 OOM insulation
resistance meter.
The insulation resistance between heating element terminal and cavity should be more than
15
Summary of Contents for R-8470
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Page 50: ...R 8470 R 8570 1 2 3 j 4 5 6 I CABINET PARTS I 1 I 1 I 2 I 3 I 4 I I 5 6 48 ...
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Page 53: ...R 8470 R 8570 1 2 I 3 I 4 5 6 DOOR ASSEMBLY MISCELLANEOUS 6 3 Trans m I I I I I I i I t ...
