Casio SF-5500B - To change a FREE entry label; Using the Memo Mode; To input Memo Mode data; To insert a new Memo Mode data item between two items in memory

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N
Y
N
Y
N
Y
Is Pin 13 of LSI1 sending the signal?
N
Y
Is the soldering of LSI2 or LSI3 poor?
Y
N
Is the soldering of LSI1 poor?
N
Replace LSI1.
Y
START
Is Pin 1 of DET1 5.2 V?
Replace DET1.
Replace LSI1.
Replace LSI1.
Resolder.
Is Pin 11 of LSI1 sending the signal?
Replace LSI1, LSI2.
1
Does the rubber key contact make positive
contact with the PCB assembly?
Replace the rubber key contact.
Resolder.
No key input