Oven Lamp Removal; Positive Lock Connector (No-Case Type) Removal; Control Panel Assembly Removal; Graphic Sheet And Membrane Switch Replacement - Sharp R-420LK Service Manual

R420LW

[6] OVEN LAMP REMOVAL

1. Disconnect the power supply cord and then remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the oven lamp.
5. Remove the one (1) screw holding the oven lamp to the magnetron
duct.
6. Remove the oven lamp from the magnetron duct.

[7] POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL

1. Disconnect the power supply cord, and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Push the lever of positive lock® connector.
5. Pull down on the positive lock® connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CONNEC-
TORS TO THE TERMINALS, CONNECT THE POSITIVE
LOCK® SO THAT THE LEVER FACES YOU.

[8] CONTROL PANEL ASSEMBLY 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 the wire leads from panel components.

[9] GRAPHIC SHEET AND MEMBRANE SWITCH REPLACEMENT

1. 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. Remove the control panel assembly, referring to chapter of CON-
TROL PANEL ASSEMBLY REMOVAL.
5. Disconnect the ribbon cable of the membrane switch from the con-
trol unit.
6. Remove the four (4) screws holding the control unit to the control
panel frame. And remove the control unit.
7. Remove the display window from the control panel frame.
8. Tear away the graphic sheet from the control panel frame.
9. Tear away the membrane switch from the control panel frame.
2. REINSTALLATION
1. Remove remaining adhesive on the control panel frame surfaces
with a soft cloth soaked in alcohol.
2. Tear the backing paper from the new membrane switch.
3. Insert the ribbon cable of the membrane switch into the slit of the
control panel frame.
4. Adjust the upper edge and right edge of the membrane switch to
the small depression on the surface of the control panel frame.
5. Attach the membrane switch to the control panel frame by rubbing
with a soft cloth not to scratch.
6. Tear the backing paper from the new graphic sheet.
7. Now, the oven lamp is free.
Terminal
Figure C-1. Oven lamp
Positive lock¨
connector
Lever
Figure C-2. Positive lock® connector
5. Straighten the nail holding the control panel assembly to the oven
cavity front plate.
6. Slide the control panel assembly upward and remove it.
7. Now, individual components can be removed.
7. Adjust the upper edge and right edge of the graphic sheet to the
large depression on the surface of the control panel frame.
8. Attach the graphic sheet to the control panel frame by rubbing with
a soft cloth not to scratch.
9. Insert the ribbon cable into the slit of the control unit.
10.Reinstall the control unit to the control panel frame and hold with
the four (4) screws.
11. Insert and connect the edge of the membrane switch's ribbon cable
into the connector CN-G.
12.Reinstall the display window to the control panel frame.
Control panel frame
Graphic
sheet
Membrame switch
Graphic Sheet and Membrane Switch Replacement
11 – 3
Oven lamp
Terminal
1
Push
2
Pull down
Large
depression
Small
depression
Ribbon
cable
Slit