Sharp R-1850 Service Manual page 35

6. Release the control panel from the oven cavity front face
plate by lifting it up.
7. Disconnect the wire leads from the relays RY1, RY2 and
RY3.
8. Disconnect the connectors CN-A, CN-B CN-C, CN-E
and CN-F from the control unit.
9. Remove the control panel assembly from the oven.
10.Now, the control panel assembly is free.
11.Disconnect the connector CN-G from the control unit.
12.Remove four (4) screws holding the control unit to the
control panel.
13.Release the two (2) tabs holding the control unit to the
control panel.
14.Now, the control unit is free.
15.Remove the one (1) screw holding the key fixing plate to
the control panel.
16.Release the four (4) tabs holding the key fixing plate to
the control panel.
17.Remove the key fixing plate from the control panel.
18.Tear the key unit from the key fixing plate.
19.Now, the key unit is free
NOTES FOR KEY UNIT REPLACEMENT
1. Do not reuse the torn key unit because the performance
of the adhesive become weak.
2. Before attaching a new key unit, wipe off remaining
adhesive on the key fixing plate surfaces completely with
a soft cloth soaked in alcohol.
3. When attaching the key unit to the key fixing plate, adjust
the upper edge and right edge of the key unit to the
correct position of key fixing plate.
4. Stick the key unit firmly to the key fixing plate by rubbing
with soft cloth not to scratch.
NOTES FOR NEW CONTROL UNIT REPLACEMENT
1. Before installation of the new CPU into the control panel,
grasp the middle section between thump and finger,
bend the display board forward a until b breaks as
shown in step 1.
a
Jumper
wires
STEP 1
POSITIVE LOCK
Push the lever of positive lock
positive lock ® connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK
CONNECTORS TO THE TERMINALS, IN-
STALL THE POSITIVE LOCK
LEVER FACES YOU.
b
Middle
Section
d
c
STEP 2
®
CONNECTOR (NO-CASE TYPE) REMOVAL
® connector. Pull down on the
®
SO THAT THE
2. To remove the middle section push both sides of the
middle section towards d until c breaks as shown in
step 2.
NOTE: Discard the middle section.
3. After removing the middle section, bend the display
board 90˚, positioning the jumper wires into the notches
of the display board as shown in step 3.
4. Insert the bottom edge of the display board under the tab
of control panel as shown in step 4.
5. PLace the top edge of the display board on the clip (F).
And press the display board downward as shown in step
4. (Holes in middle of display board should be positioned
into locator pins.)
6. After installing display board, press the CPU downward
90˚ until CPU is locked into place by the clips.
7. Hold the CPU with the four (4) screws.
8. After installing CPU, make sure jumper wires are not
bent, touching or broken.
Top edge of the display board
Middle
section
CN-G
Jumper
wires
Control
Notches
panel
STEP 3
®
Positive lock
33
Display
Board
b
Break
point
c
LSI
Control Unit
Clip (F)
Clip (E)
Locator pin
STEP 4
Terminal
Positive lock®
connector
Lever
Pull down
®
connector
R-1850
R-1851
1
Push
2