Toshiba E-STUDIO520 - Operation; Scanner Motor (M1); Two-Phase Motor Drive Circuit (Fixed-Current Type)

e-STUDIO520/600/720/850 SCANNING SECTION March 2005 © TOSHIBA TEC
6 - 4
6.3 Operation
6.3.1 Scanner motor (M1)
Fig.6-3
• Scanning an original on the original glass
This motor drives the carriages-1 and -2 through the timing belt and carriage wire. First, the scan
motor (M1) drives carriages-1 and -2 to their respective home positions. The home position is
detected when carriage-1 passes the carriage home position sensor (S6). When the [START] key is
pressed, both carriages start to move and scan the original on the glass.
• Scanning an original on the RADF
Carriage-1 stays at the shading position during the shading correction, and at the scanning position
during the scanning operation.
6.3.2 Two-phase motor drive circuit (fixed-current type)
The scan motor (M1) with the unipolar fixed current chopper method is driven by the stepping motor
driver STK672-410 (IC19).
Fig.6-4
Ø30.83/2GT-Z84
Ø22
Ø22
2GT-Z24
Carriage wireScan motor
Carriage-1
Pulley for carriage-2
Idler pulley
Carriage-2
Motor pulley
Wire pulley
Scan motor
SLG board
1
2
3
4
5
6
6
5
4
3 2 1
IC19
IC10
CN8
+36V
MOTEN-0
MOTDIR-0
MOTRST-0
MOTREF-0
MOTMD3-0
MOTMD2-0
MOTMD1-0
MOTCLK-1
Scanner CPU
Motor
driver