Specifications

— 16 —
1
N
Replace CPU (LSI1)
Y
N
Replace DET1
Are 10, 11, and 13-Pins of CPU (LSI 1)
sending the signals?
Is 1-Pin of RH5VL46CA (DET 1) 5[V]?
N
Replace PCB
< No key input >
Does key make positive contact with PCB
Ass’y
Y
Does CPU make positive contact with PCB?
N
Replace CPU (LSI1)
Y
Resolder CPU (LSI1)
Y
Does RAM make positive contact with
PCB?
N
Resolder RAM (LSI2, LSI3 or LSI4)
Y
Is 12-Pin of CPU (LSI1) sending
the signal?
Y
N
Replace CPU (LSI1)
Does ROM make positive contact
with PCB?
Y
N
Resolder ROM (LSI5)
Replace RAM (LSI2, LSI3 or LSI4) or CPU
(LSI1)