i
CR 3600
TM
– Service Manual
6.2.5
PMT Board
The photomultiplier tube amplifies the photons from the CR plate and converts them into
electrical signals.
6.2.6
Power Distribution Board
!
WARNING
Do not handle supply when unit is on. Do not disconnect cables when unit
is powered up.
Large supply:
±
18 V,
±
12 V, +5 V.
Small supply:
+24 V.
High Voltage Supply (PMTs):
1000 V.
6.2.7
LED Eraser Board
The LED Eraser board provides single wavelength light to erase CR plate.
6.2.8
Motor Controller Board
This section of the CR controls the stepping motor to drive the plate past the scan head and
return it to the “home” position.
6.2.9
Analog to Digital Conversion
During the scanning process signals are generated by the PMT sensors and transmitted to
the computer through a USBII interface cable. A trigger signal generated by the laser spot
is transmitted to the PMT board to trigger a line capture. Image is assembled from lines of
captured data that is held in registers and translated into a 16 bit raw source file. There is
no way to pause the data capture process. Cancel will cause the machine to stop and return
to home position. Data on the CR plate will be lost.
Note
If an image is canceled during the scan process, the plate will have to be erased again
to ensure that the plate is entirely erased.
6.2.10
Calibration
Gain Adjustment
Gain Control is used to compensate for reduction in sensitivity of the PMT detectors due to
age. The gain can be adjusted in the software.
c
2007-2009
Confidential and Proprietary
Property of
i
CRco, Inc.
24 of 61
Document # 3600-02A Rev C
March 22, 2010
Summary of Contents for iCR 3600
Page 1: ...iCR3600 SERVICE MANUAL ...
