—
25
—
N
Y
N
Y
N
Y
Is Pin 13 of LSI1 sending the signal?
N
Y
Is the soldering of LSI2, LSI3 or LSI4 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, LSI3, or LSI4.
Does the rubber key contact make positive
contact with the PCB assembly?
Replace the rubber key contact.
Resolder.
No key input
1
Summary of Contents for LX-551AQ
Page 1: ...R SF 5300E LX 551AQ JAN 1995 with price SF 5300E...
Page 3: ...1 1 SCHEMATIC DIAGRAM 1 1 MAIN PCB...
Page 4: ...2 1 2 KEY MATRIX 1...
Page 37: ...MA0200651A...
