Toshiba e-studio555 User Manual

9
© 2009 - 2011 TOSHIBA TEC CORPORATION All rights reserved e-STUDIO555/655/755/855
PROCESS RELATED SECTION
9 - 7
9.5.3 Description of operation
1. Correction control procedure of drum surface potential
- The setting value of the main charger bias voltage when the surface potential stored in the
NVRAM is measured is output to the Main-CPU.
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- The reference voltage data (digital data) is output from the Main-CPU to the D/A converter
through the ASIC.
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- The reference voltage data is converted at the D/A converter into the reference voltage (Vctr)
(analog data), and the data is then output to the high-voltage transformer.
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- The high-voltage transformer outputs the main charger bias voltage based on the reference
voltage, and thus the drum is charged.
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- The drum surface potential is measured by the drum surface potential sensor, and the measured
value (DRV0-1A) is then fed back to the Main-CPU.
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- The current state of the drum (deterioration) is assumed based on the measurement result of the
drum surface potential, and then the result is sent to the image quality control circuit.
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- The image quality control changes the image formation condition to make the image density and
the line width appropriate.
At this time, the image quality control determines the main charger bias output (effective value).
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- The determined effective value of the main charger bias is stored in the NVRAM.
2. Timing of drum surface potential measurement
The drum surface potential is measured with the performance of the image quality control.
The image quality control is performed at the timing as follows.
- When the power is turned ON first thing in the morning or during warming-up after a specified
period of time has passed since the last operation
- When a print job is completed after a specified number of sheets have been printed out
- When a print job is resumed after a toner cartridge empty status has been released
* The drum surface potential measurement and whether or not the result reflects to the image
quality control can be set in the Setting Mode (08).

Toshiba e-studio555 Specifications

Power

power supply	120 Volts; 20 Amps
power consumption	Maximum 2.0kW
warm-up time	Appx. 130 Seconds

Printing and Copying

copy/print resolution	2400 x 600 dpi
copy/print speed	55 / 65 / 75 / 85 cpm
print speed	55 / 65 / 75 / 85 ppm

Scanning

scan speed	80 spm LT-Size @300 dpi
scan resolution	150 dpi, 200 dpi, 300 dpi, 400 dpi, 600 dpi
file format	TIFF, PDF, JPEG, XPS, MS Word, MS Excel, Searchable PDF w/ Adv. Scanning option

Memory and Storage

memory	1GB RAM, 60 GB HDD
fax memory transmission	500MB (HDD)
reception	500MB (HDD)

Connectivity

connectivity	Ethernet 10/100BaseT, USB 2.0, 802.11b/g Wireless LAN, Bluetooth (HCRP)
protocol support	IPX/SPX, TCP/IP (IPV4/V6), EtherTalk, AppleTalk PAP, LPR/LPD, IPP w/Authentication, Port 9100
operating systems	Windows 2000/XP/2003/Vista/2008, Mac X OS 10.2.4/10.3/10.4/10.5, UNIX, Linux, CUPS

Weight and Dimensions

dimensions	28” x 31” x 46” (W x D x H)
weight	462 lbs
standard paper supply	2 x 500-Sheet Drawer; 2 x 1, 250-Sheet Tandem Drawer; 100-Sheet Stack Feed Bypass