2-46 Phaser 6121MFP Service Manual
Theory of Operation
Power Supply Fan
The Power Supply Fan cools the system Power Supply and operates at full-speed,
half-speed, or stopped states.
The Power Supply Fan runs at full-speed for:
• A set period of time after the Power Switch is turned On.
• A set period of time after exiting Energy Saver mode.
• At the start of a print cycle (full-speed rotation after a set period of half-speed
rotation).
The Power Supply Cooling Fan runs at half-speed:
• At the end of a print cycle (half-speed rotation following the predetermined
period of time needed for full-speed rotation).
• During half-speed rotation under any condition other than above.
The Power Supply Fan stops when:
• The system enters the Energy Saver mode.
• The Power Switch is turned Off.
Ventilation Fan
The Ventilation Fan cools the system cabinet and operates at full-speed when the
Main Motor is in operation.
Output Tray Fan
The Output Tray Fan cools the Scanner and operates at full-speed, half-speed, or
stopped states according to these conditions:
The Output Tray Fan runs at full-speed:
• A set period of time after the Power Switch is turned On.
• A set period of time after exiting Energy Saver mode.
• At the start of a print cycle (full-speed rotation after a set period of half-speed
rotation).
The Output Tray Fan runs at half-speed:
• At the end of a print cycle (half-speed rotation following the predetermined
period of time needed for full-speed rotation).
•During standby.
The Output Tray Fan stops when:
• During Energy Saver mode.
• During firmware upgrade.
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