Helmholtz Silencer; Cooling Operation After Output - Ricoh MP C2504 Field Service Manual

• *1 If the imaging temperature reaches 41°C each fan will continue operating until it falls by
2°C.
• *2 Operating condition:
When the time interval from the previous job is less than 10 minutes. Or, when the time
interval from the previous job is more than 10 minutes, and 5 minutes have elapsed from start
of machine.
• *3 Operating condition:
For 36°C or above, full speed rotation at 24V
For less than 36°C, rotated at low speed with voltage reduced to 13V (rotating speed
approximately 50%)
Changes from low speed rotation to full speed rotation when printing continues for more than
5 minutes while the temperature inside the machine is 36°C or lower

Cooling operation after output

Usually, after output, fan operation is suspended.
If the temperature in the machine after output is high, fan rotation is continued after output to cool
the interior of the machine.

Helmholtz Silencer

The Helmholtz silencer applies the resonance phenomenon called the "Helmholtz resonance" to emit a
sound having reverse phase of the motor frequency by resonance and cancel the motor noise.
On this machine, it is located on the controller box side to reduce the noise. The BCU [B] is mounted on
the mold [A] of the Helmholtz silencer.
Exterior Cover/ Air Flows (Fan Control)
1207