Troubleshooting - Casio SF-4400 Service Manual & Parts List

7. TROUBLESHOOTING

< No power on >
Is contrast adjustment OK?
Is power of batteries enough?
Does display appear by pressing
Reset button?
Does it sound by key enter?
Do batteries make positive contact with
the battery springs?
Y
Is 3-pin of S-81253 (REG1) 5.3 [V]?
Are capacitor C8, C9, C10, C11, C12,
C13 OK?
Replace REGT1
Y
Y
N
N
Y
N
Y
1
— 15 —
N
Adjust contrast
N
Replace batteries
Y
Check other function
Y
Refer to <No/Erratic display>
N
Adjust contact and clean battery
spring
N
Replace C8, C9, C10, C11, C12,
C13