Panasonic NN-S251WL - Page 32

7-21
PROBLEM - A: “PLEASE SET TIME OF DAY” does not appear in display window when power supply cord is
plugged into wall outlet.
PROBLEM - B: Display does not show correct numbers and/or
correct indications when programmed.
Check: 1. POWER SUPPLY
2. FUSE (See “CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7-18)
3. OVEN CAVITY THERMOSTAT
1 1
C. TROUBLE SHOOTING Before following this troubleshooting read “TRIAL OPERATION” on page 6-1.
• “DISPLAY” Problems, “A” thru “C”
• “HELP UP” Problems, “D” thru “E”• “BUZZER Problems, “F”
Measure voltage between pin 1 and pin 3 of connector CN1.
Measure resistance of touch key board after removing connector S1. (See page 7-4 and 7-17)
0
120
120V
Replace
circuit board
Normal
circuit board
Normal
resistance
Voltage
incorrect
Normal
resistance
Resistance
incorrect
Replace touch
key board.
Normal touch
key board
Poor
contact
Correct
seating
Contact
ok
Replace
circuit board
Normal
circuit board
Normal
contact
Check contact
of connector S1
Correct
connections
0
120
WH
RD
Runs
Runs Runs Runs Runs