Grille Removal, Control Panel, Smart Board - GE SpaceMakerXL JMV1420 Technical Service Manual

GRILLE REMOVAL
The top full-width grille is removable for service to some
components, such as: humidity sensor, oven light, door
removal, stirrer motor and flame sensor. To Remove Grille:
1. Disconnect oven power.
2. Remove Phillips-head screws (2) from grille.
3. Lift bottom of grille and push top of grille down to remove.
CONTROL PANEL
The touch control panel is made up of the key panel and
control housing trim (I -piece) and the smart board. Touch
control will not be available as one complete assembly. If
necessary the key panels can be checked by a continuity
test.
To Remove Touch Control:
1. Disconnect power and remove grille.
2. Remove I screw at top of control panel. Lift up on control
to release tabs.
3. Disconnect grounding screw and connectors.
4. Lift up on control to release hinge from mounting screw
(GE Models, others remove mounting screw).
CONTROL SMART BOARD (PCB)
Note: Most connectors are positive lock, check before pulling
wire The control smart board is located on the back of the
control panel. The smart board has 7 disconnect plugs and
they control the following:
CON. I -16 pin ribbon connector
CON. 2 -07 pin vent blower connection
CON. 3 -06 pin primary L.V.T. & main relay
CON. 4 -door sensing & probe connector
CON. 5 -gas sensor connector
CON. 6 -speaker and microphone connector (1460/1660)
Disconnect plugs can be used for diagnostic circuit tests.
To Remove Smart Board:
1. Disconnect power, put control in service position (open
door, remove I screw at top), and discharge capacitor.
2. Remove and mark connectors and leads from board.
3. Unscrew the 4 smart board mounting screws. Slide board
down to free from the 2 mounting tabs.
NOTE: Do not flex board.
TOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel assembly is divided into two
units, Touch Control Pad and Smart Board, and trouble-
shooting by unit replacement is described according to
the symptoms indicated.
1. Touch Control Pad.
The following symptoms indicate a defective touch
control pad:
a) When touching the pads, a certain pad produces no
signal at all.
b) When touching a number pad, two figures or more are
displayed.
c) When touching the pads, sometimes a pad produces
no signal.
NOTE.- If necessary touch control pad can be
checked with ohmmeter. (see page 4)
2. Smart Board
The following symptoms indicate a defective smart
board:
2-1 In connection with pads
a) When touching the pads, a certain group of pads do
not produce a signal
b) When touching the pads, no pad produce a signal.
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light
up, or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems caused by defective
smart board
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
d) Proper temperature measurement is not obtained.
REMOVE SMALL GRILLE TO GAIN ACCESS TO
FUSE, SPEAKER, & CAPACITOR
15