Toshiba e-studio555 User Manual

e-STUDIO555/655/755/855 © 2009 - 2011 TOSHIBA TEC CORPORATION All rights reserved
DRUM/CLEANER UNIT
10 - 4
10.4 Image Quality Control
10.4.1 Outline
This equipment performs image quality control with the image quality sensor. Image quality control is
for altering the image formation condition to minimize the changing of the image density and line width
caused by the setting environment for the equipment and the life of consumables.
The image quality sensor detects the density of the test pattern developed on the drum, and the image
formation condition is changed depending on the result.
10.4.2 Construction
The construction of the control circuit is as follows.
• Image quality sensor:
This sensor emits the light corresponding to the voltage of the light source amount signal output
from the control section onto the drum, and outputs the voltage corresponding to the reflected light
amount of the drum and the test pattern (toner image) on the drum.
• Control section (LGC board):
This section performs image quality control mainly with the main CPU, which outputs the light
source amount signal (CTDVR-1A) of the image quality sensor by a D/A converter, and converts the
reflected light amount signal (CTDS-1) into a digital signal by mean of the A/D converter embedded
in the main CPU and reads it, and then sets the image formation condition based on the read result.
• Image formation process system:
This system consists of the process of charging, laser exposing and developing. Each process is
operated based on the image formation condition set by the control section. When image quality
control is performed, the laser unit exposes the test pattern on the drum.
Fig. 10-3
Image formation process system
LGC board
IC58
Main CPU
Laser exposure
Main charger
Drum
Developing
Test pattern
Image quality sensor
Reflected light
amount signal
(
CTDS-1 signal
)
Light source amount signal
(
CTDVR-1A signal
)
A/D converter
IC18
D/A converter
Various image formation conditions
IC56
ASIC
CTDVD-1A
CTDVC-1A
IC12, 98
Operational
amplifier circuit

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