Samsung SCH-1500 series Service Manual page 62

Troubleshooting
8-7-3 Data Comm & Cont.
Check MPU (1PIN), 5V?
Normal X1 output?
Check MPU 17, and 18PIN,
DATA PULSE?
END
8-16
N
Y
N
Y
N
Y
Check INTPWR PIN, and U4
Check C40, and C41
Check D11, D15, Q11, and 12
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