Toshiba e-studio555 User Manual

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DEVELOPER UNIT
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11.5.2 Operation of auto-toner sensor
1. Functions of the auto-toner sensor
- Initializing function: When the copier is set up or when the developer material is replaced
The automatic adjustment is made so that the output of the auto-toner sensor (input value of the
main-CPU) will be 2.45 to 2.85V for the toner density of new developer material.
- Toner density stabilizing function: During the printing operation
Through the following phases, the toner density is kept constant.
The toner is consumed.
→ The toner density is lowered.
→ The output change of the auto-toner sensor caused by humidity is detected.
→ The new toner transport motor, new toner supply motor and hopper motor are driven.
(The new toner supply motor and the hopper motor are driven only when the new toner is left in
the toner cartridge and also the front cover (upper) is closed.)
→ The toner is supplied to the developer unit from the sub-hopper (toner cartridge) and the
recycle toner hopper.
- Detection and release of empty status of the developer unit
The empty status of the developer unit is detected in the following procedure.
The new toner supply motor and the new toner transport motor are driven.
→ The output value of the auto-toner sensor remains the same.
→ The toner density is not changed.
→ The developer unit is judged as empty.
The empty status of the developer unit is released in the following procedure.
The new toner supply motor and the new toner transport motor are driven.
→ The new toner is supplied to the developer unit from the toner cartridge.
→ The output value of the auto-toner sensor is changed.
→ The toner density returns to its normal value.
→ The empty status of the developer unit is released.
2. Auto-toner sensor drive circuit
The auto-toner sensor is composed of the following circuits.
- Drive winding:
Magnetic head (primary side) with a high-frequency magnetic field, which forms a magnetic
circuit in the developer material
- Detection winding:
Receiving the changes in the magnetic resistance of the developer material via a magnetic circuit
(secondary side)
- DC conversion circuit:
Converting the high-frequency output from the detection winding to a DC signal (auto-toner
output ATS-1A)
Fig. 11-8
Developer material
Magnetic resistance
Drive
winding
Detection
winding
DC
conversion
circuit
Auto-toner sensor
output
To the main-CPU
(
LGC board
)
ATS-1A
Magnetic circuit
Magnetic resistance
Developer material

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