Samsung SC-148B Service Manual page 32

When installing is impossible
Connect power cable and I/F cable
between PC and CD-ROM
Y
Does INSTALL message appear?
Y
Is IC301 55PIN 5V when main power
turns on?
Y
Is IC201 95PIN 5V?
Y
Does X401 oscillate?
Y
Do the digital signal of IC301 and IC401
communication pattern change from 0V to
5V?
Y
IC401, CN701, is normal
communication singnds?
Y
Connet 1/F cable
N
N
Check main power-end and initial
N
N
Check soldering of C401, C402
N
Check the soldering of IC401, IC301
and pattern open/short
N
Check the soldering of Damping
Resister and IC, I/F Wafer
25
Normal
state