Toshiba e-STUDIO350 Service Manual page 214

(2) Function of auto-toner sensor
The auto-toner sensor consists of the following circuits:
· Drive winding
· Detection winding
· DC conversion circuit : Converts a high-frequency output from the detection winding into a DC
Magnetic resistance
( Developer material )
Magnetic circuit
When the toner density is low—
12
The ratio of the toner against the carrier in the developer material decreases.
→The magnetic resistance decreases.
→The detection output increases.
→The auto-toner output V
When the toner density is high—
The ratio of the toner against the carrier in the developer material increases.
→The magnetic resistance increases.
→The detection output decreases.
→The auto-toner output V
e-STUDIO350/450 DEVELOPMENT SYSTEM
: A magnetic head (primary side) with a high-frequency magnetic field, which
forms a magnetic circuit in the developer material.
: Receives the change in the magnetic resistance of the developer material
through the magnetic circuit (secondary side).
signal (auto-toner output V
Drive Detection
winding winding
Fig. 12-402
increases.
ATS
decreases.
ATS
).
ATS
Auto-toner
DC
output
conversion
circuit
V
ATS
12 - 6
To the main
CPU ( LGC board )
November 2003 © TOSHIBA TEC