Epson DFX-9000 - Page 93

Epson DFX-9000 Revision B
Operating Principles Circuit operation 86
Perforation Cutter Drive Circuit
The Perforation cutter motor is controlled by the output of the PHASE
and ENABLE signals from the Mechanism Control ASIC. The
following figure shows a detail block diagram of the Perforation cutter
drive circuit.
Figure 2-32. Perforation Cutter Drive Circuit Block Diagram
Motor Malfunction Detection
Each motor drive circuit is equipped with the overcurrent detection
function.
 SP motor, Perforation cutter motor
When the set current value is exceeded, the power line is shut off by
the fuse.
 LF motor, RF motor, HCPP motor, and APTC motor
When an abnormal current that exceeds the prescribed level is
detected, the status is sent to the Mechanism Control ASIC. If the
Mechanism Control ASIC detects that the status has continued for a
certain period of time, the 42 V / 37 V line for the ROM board is cut
off by turning the X42VPST signal to LOW. The firmware
recognizes this state when it performs a Read operation on the
Mechanism Control ASIC internal register.
CUT/ON
(ENABLE)
CUT DIR
(PHASE)
Motor
Remark
MTR A MTR B
H - - - Sleep Mode
L L L H Normal rotation
L H H L Reverse rotation
ASIC
Power Unit
Safety Check
detection section
PHASE_P
ENABLE_N
+37V
M_TIM4
Fuse
(125 V, 8 A)
Perforation
Cutter Unit