B. TROUBLESHOOTING
STEP
SEQUENCE
RESUL
T
(1) PROBLEM
No display or mis-display in
the display window by touching
the keys.
a
Check 230V
AC power
supply of connector S1
between Pin3 and Pin 5
after removing connector
S1 from control circuit
board.
Check continuity of
FUSE
,
Thermal Protector for cavity
,
Thermal Protector for
magnetron and
AC Power
Cord.
If the fuse has blown see
"D. REMOVING FUSE" on
page 17.
0 230
0 V
olt
0 230
230 V
olt
PROBLEM
1-b
Control
Circuit Board
Check power supply voltage
on control circuit board.
(See page 8 )
V
oltage
incorrect
Replace it if
necessary
Correct seating of
connector S101 or
replace control circuit
board.
Replace touch
keyboard
Check resistance of
touch keyboard
(See page 8 )
0 V
0
V
Each V
oltage
OK
∞
0
Check Resistance
OK
∞
0
Resistance
is correct
ON
or
OFF
Normal touch
keyboard
Normal control
circuit board
Replace control
circuit board.
Normal control
circuit board
b
Runs
Runs
Runs
Runs
-10-
