AGFA Avantra 36/44, Service Manual, Page: 60 / 521

Section I: Imagesetter
Functional Analysis 2-11
The Laser Diode Drive, (LDD), connects to the CSDM. All controlling signals pass
from the DEC, through the Flex-Band, and through the CSDM to the LDD. Also see
Figure 2-4.
Figure 2-4 Carriage sensor driver module (CSDM) block diagram.
2.7 Sensor Driver Module (SDM)
The SDM PC board provides motor driver and sensor control for the media trans-
port system. Two identical SDMs are located in the system. Although referred to as
the supply sensor driver module (SSDM) and the take-up sensor drive module
(TSDM), they sometimes control functions on the opposite side of the system. Refer
to the SSDM and TSDM interconnect illustrations for the functions they support.
The SDMs perform several functions for the Media Transport system:
• Provides a direct connection to the DEC through a ribbon cable, and pro-
vides power and control of reads and writes of all devices connected to the
SDMs.
• Provides the necessary drive for all the media transport motors and sole-
noids.
Polarizer/spot Stepper Motor
Carriage Motor
Driver
Spinner Motor
Driver
Stepper
Driver
Carriage Sensor
Drivers
Laser
Driver Signals
Carriage Motor (pancake)
Position Encoder (digital)
Velocity Encoder (Analog)
Spinner Motor
960 Line Encoder
Focus Stepper Motor
Focus Home Sensor
Spot Changer Home Sensor
Polarizer Home Sensor
To Laser Driver Module