1/05
10-16
DocuColor 12/DCCS50
Unswitched DC Power, Switched AC Power
Reissue
Principles of Operation
Unswitched DC Power
All unswitched DC power originates from the AC Driver PWBA.
AC Driver PWBA
The AC Driver PWBA generates +5 VDC and +12 VDC. Both DC voltages are derived from the
output of the 18 VAC Transformer. The +12 VDC output goes to the Fuser Fan, while the
+5VDC is supplied as EVER +5V to several assemblies:
• The IOT Drive PWBA
•Vsel PWBA
• Halftone PWBA
•EPSV
• The IOT CPU PWBA, via the IOT Drive PWBA
• The Main Power Switch
The AC Driver PWBA contains Prime AC Power switching relays
, but control of these relays is
distributed among several assemblies. The topic is covered in detail in the Power Switching
Control Circuitry section.
Switched AC Power
Switched AC Power from Power Relay 2 on AC Driver PWBA goes to the following assemblies:
• IOT LVPS
•Oil Pump
• IIT/IPS LVPS
• Fuser Solid State Relay (SSR)
AC Power from the Fuser SSR goes to the following assemblies:
• External Heat Roll Lamp
• Pressure Roll Lamp
• Heat Roll Lamp
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