Sony PCS-1500 Service Manual page 178

4-2. Self-diagnostics Function
A-1
IC110 and its peripheral
A-2
All devices that
are connected to the 5 V
bus are abnormal?
NO
P-02
All devices that
are connected to the
3.3 V-2 bus are
abnormal?
NO
Diagnose the individual device
that have resulted in error
4-48
YES
P-01
IC108, IC109 or their peripheral
YES
IC105, IC106, IC107 or their
peripheral
PCS-1500/1500P