Casio SF-4300B - Using the Schedule Keeper; About date and time input

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< No/Erratic display >
Is input 2-Pin of S-81253 (REG1) 6[V]?
Is output 3-Pin of S-81253 (REG1)
5.3[V]?
Y
Y
N
N
Check batteries
Replace REG1
N
N
Does CPU (LSI1) make positive con-
tact with PCB?
*CONTRAST: MAX
Resolder
Y
N
Resolder/Replace CPU, IC
Y
< High current consumption >
Y
Check PCB
Is there any short circuit?
Y
N
Are the several capacitors OK?
Replace capacitors
Are voltage of several capacitors enough?
V1: 1.3 [V]
V2: 2.5 [V]
V3: 2.7 [V]
V4: 3.9 [V]
*
Replace CPU (LSI1)
Check solder part of C6, C7, C8,
C9, C10 or replace.