Service manual

7
R-305CW
Removal
1. Disconnect the power supply cord and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads from magnetron.
5. Remove the four (4) screws holding chassis support to
magnetron, oven cavity front flange, oven cavity back
plate and fan duct.
6. Remove the chassis support from oven.
7. Carefully remove the four (4) screws holding magnetron
to waveguide flange.
8. Lift up magnetron with care so that magnetron antenna
is not hit by any metal object around antenna.
9. Now, the magnetron is free.
Re-install
1. Re-install the magnetron to waveguide flange with the
four (4) screws.
2. Insert the two (2) tabs of the chassis support to the oven
cavity front plate and the back plate.
3. Hold the chassis support to the oven cavity back plate,
oven cavity front flange, magnetron, and the fan duct
with the four (4) screws.
4. Re-install the chassis support to magnetron with the one
(1) screw.
5. Reconnect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM".
6. Re-install outer case and check that the oven is operating
properly.
CAUTION: WHEN REPLACING MAGNETRON, BE SURE
THE R.F. GASKET IS IN PLACE AND MOUNT-
ING SCREWS ARE TIGHTENED SECURELY
MAGNETRON REMOVAL
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-2. Power Unit Circuit
+
–
A 1
C 3
C 5
C 9
C 4
C 6
C 8
C 1
C 7
C 2
A 2
NO
NO
SH-A
COM
COM
D1
S1NB10

T1
AC
AC
GND
VR
INT
BUZZER
MICRO
(BROWNER)
NC
DOOR
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
CN-C
9PIN LEAD WIRE
HARNESS
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR

MICRO
DOOR
SWITCH
CN-A
RY1
RY2
a
b
c
d
(J1)
VRS1
SP1 PKM22EPT
C1 2200µ/25v
10G471K
SH-B