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NN-8507,
NN-8557
NN-8807,
NN-8857
DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE
1. Replacement of the magnetron
THERMAL
AIR
GUIDE
A
CUTOUT
AIR
GUIDE
E
CAUTION
Servicemen should remove their watches whenever
working close to or replacing the magnetron.
(A) Discharge the high voltage capacitor. (See page 13)
(B) Remove 2 screws holding thermal cutout.
(C) Remove 4 screws holding air guide A and E. (Fig. 16A & 16B)
(D) Remove 2 high voltage leads from filament terminals. (F, FA)
(E) Remove 4 screws holding the magnetron. (Fig. 16B)
NOTE: To prevent microwave leakage, tighten mounting screws proper-
ly making sure there is no gap between the waveguide and the
magnetron.
CAUTION
When connecting 2 filament lead wires to the mag-
netron terminals, be sure to connect the lead wires in
the correct position. The lead wire of high voltage
transformer should be connected to "F terminal" and
the lead wire from high voltage capacitor should be
connected to "FA terminal". (See Fig. 16B)
SOLENOID
MAGNE TRON
NOISE
FILTER
Fig. 16A
2. Replacement of the fan motor
(A) Remove the magnetron.
(B) Disconnect 2 lead wires from the fan motor terminals.
ete ae
A
sonar
MAGNE TRON
(C) Remove fan blade from the fan motor shaft by pulling it straight out.
(D) Remove 2 screws holding the fan motor.
SHUTTER
SOLENOID
Fig. 16B
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