Sharp AM-900 Service Manual page 87

2.3. Power section
The Control PWB requires multi voltage (+1.8V, +3.3V, +5V, +24V,
+24VH).
+3.3V, +5V, +24V and +24VH are supplied from the power supply unit,
and +1.8 V are generated by the regulator (IC8).
+3.3VR is generated by regulator (IC9) on the Control PWB, is the
exclusive use as clean power for scanner.
INT5V is generated by regulator (IC22) on the Control PWB, is the
exclusive use as interlocking power for Optical unit (LSU).
Its structure is as shown below.
Power Supply
Unit
+24VH(*)
+24V (**)
+5V
+3.3V
Control PWB
KIA7805API (IC22)
XC6219B332PR (IC9)
FAN1117AD18X (IC8)
(*) Supplied always regardless of door open/close.
(**) Supplied only when door is close.
Fig. 7
5 – 14
AM-900U
+24VH
+24V
INT5V
+5V
+3.3VR
+3.3V
+1.8V