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Is 17-Pin of µPD3056G -007(LSI 1)
0[V]?
Replace IC1
N
Is 18-Pin of µPD3056G-007 (LSI 1)
0[V]?
N
Replace TC4S69F (IC2)
Y
Replace IC4
N
Y
Y
N
Y
Does key make positive contact with
L571-1 Ass’y
Y
Replace C12, C13
N
Clean/Adjust contact
<No key input>
Is 3-Pin of S-81250HG-RD (IC4) 5[V]?
Refer to <No/Erratic display>
1
Are capacitor C12, C13 OK?
Replace µPD 3056G-007 (LSI1)
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