August 2006
PROCESS CONTROL
6-79
Detailed
D
escr
iptions
TD Sensor
There is a TD sensor [A] below the development unit of each PCU.
The TD sensor directly measures the amount of toner in the developer/toner
mixture. Unlike previous machines, this TD sensor is not in direct contact with the
developer/toner mixture.
Vt is the output voltage of the TD sensor. When Vt goes high, toner is added to the
developer to bring Vt back to the Vtref value.
Temperature/Humidity Sensors
Two temperature/humidity sensors are used for process control. One is above the
black PCU, and one is below the waste toner bottle.
Temperature/humidity sensor – PCU K
This sensor is in the black PCU (the last PCU on the right).
The output of this sensor is used to:
•
Set the level of the ac charge applied to the charge roller of each PCU
•
Set the length of time the agitator in the development unit rotates to mix the
developer and toner.
•
Controls the Peltier unit
Bottom temperature/humidity sensor
This sensor is below the waste toner bottle.
The output of this sensor is used to control the amount of current applied to the ITB
and paper transfer roller. It is also used to correct the fusing idling temperature.
B132D905.BMP
[A]
Summary of Contents for e-STUDIO 4500c
Page 722: ...BOARDS August 2006 6 6 6 2 BOARDS 6 2 1 BLOCK DIAGRAM B132D981 WMF ...
Page 871: ...A3 11 x17 PAPER SIZE TRAY Machine Code B331 06 09 ...
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Page 878: ...LCT LARGE CAPACITY TRAY Machine Code B473 06 09 ...
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Page 896: ...PAPER END DETECTION September 2006 B473 16 06 09 ...
Page 897: ...Peripherals 2000 3000 SHEET FINISHER Machine Code B700 B701 ...
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Page 972: ...COVER INTERPOSER TRAY Machine Code B704 06 09 ...
Page 988: ...3000 SHEET FINISHER Machine Code B706 06 09 ...
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Page 1048: ...9 BIN MAILBOX Machine Code B762 06 09 ...
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Page 1062: ...PAPER MISFEED DETECTION TIMING September 2006 B762 12 06 09 ...
Page 1096: ...e STUDIO4500c 5500c POINT TO POINT DIAGRAM 1 4 ...
Page 1097: ...e STUDIO4500c 5500c POINT TO POINT DIAGRAM 2 4 ...
Page 1098: ...e STUDIO4500c 5500c POINT TO POINT DIAGRAM 3 4 ...
Page 1099: ...e STUDIO4500c 5500c POINT TO POINT DIAGRAM 4 4 ...
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