Fuser Motor Control Circuit - Toshiba e-STUDIO2500c Service Manual

15.5.2

Fuser motor control circuit

The fuser motor, which is a brush-less DC motor driven by control signals from the ASIC on the LGC
board, drives the pressure roller.
LGC board
IC41
ASIC
IC56
ASIC
Control signal
Signal
FSMON Motor ON signal
FSMDIR Rotation direction signal
FSMGA Speed switching signal
FSMCK Reference clock
FSMRDY Rotation lock detection signal
* CW: Clockwise rotation, CCW: Counter clockwise rotation viewing from the axis
* FSMDIR signal is fixed at a high level and rotates only counter clockwise.
* When thick paper or OHP sheet is used, FSMGA signal moves to a low level to reduce the motor
speed in half and lower the paper transport speed so that the fusibility of toner is improved.
e-STUDIO2500c/3500c/3510c FUSER UNIT / PAPER EXIT SECTION
IC13
FSMCK
FSMGA
+5.1VB
IC57
FSMON
+5.1VB
FSMRDY
Fig. 15-6
Function
15 - 14
+24VD1
FSMDIR
Status
High level
OFF
CCW
High speed
---
Unlocked
Fuser motor
Low level
ON
CW (unused)
Low speed
---
Locked
(Rotating at a constant
speed)
May 2006 © TOSHIBA TEC