Ricoh SP 8400DN Field Service Manual page 1431

Ricoh a3 size black and white laser printer.

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Around the PSU

By installing the duct corresponding to each fan, the air flow is efficiently controlled to a cooling target.

Moreover, improvement in quietness and energy-saving efficiency is achieved by performing stepwise operation

of the fan according to the imaging temperature.

Cooling of PSU

The PSU is cooled by the PSU cooling fan, cooling the PSU board directly.

Cooling of Development Unit

The cooling for development unit is provided by a development bearing cooling fan that takes air in from the rear

of the machine outside and applies the air to the bearing of mixing auger and bottom side of the development unit.

Cooling of PCDU

Air taken in from the PCDU cleaning unit is taken out from the left rear exhaust. An air-flow duct is installed at

PSU cooling fan

7.Detailed Descriptions

Chapters

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