Procedure: Service
Title: Replacing the Beam Blocker Assembly
Procedure number: DXRxi-007
Revision: 00
DXRxi
Part number: 714-026600
Part description:
Functional description: DXR beam blocker assembly
Problems associated with this assembly: bad or sticky solenoids
Tools required: English Allen wrenches
Estimated time required: 3 hours for replacement and system testing.
Notes: The beamblocker solenoids are very reliable and unlikely to fail. They
need 12 volts to activate.
If one (or both) of the solenoids does not activate and pull out of the beam it is
more likely that one of the interlock switches (stage cover magnets needs
adjustment).
A bad left or right flex circuit could also be bad preventing proper operation of
the beamblocker solenoids.
The motor control board could also be defective or a flex cable may not be
inserted correctly.
This document contains confidential or proprietary information of Thermo Fisher Scientific. Neither this
document nor the information therein is to be reproduced, distributed, used or disclosed, either in whole or
in part, except as specifically authorized by Thermo Fisher Scientific.
3/24/2014
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DXR-007 Replacing the Beam Blocker Assembly
Revision 01
Introduction
The beam blocker assembly is made up of two solenoids with flags attached.
Each solenoid is controlled by a magnetic reed switch in the microscope stage
cover. When the stage covers are opened there is no power on the solenoids
and they drop into the beam. This prevents laser radiation getting near the
operator.
1.
Power down the instrument
Press and hold down the blue power button for 4 seconds until the LEDs
go out. Then unplug the AC power cord to the external brick power supply.
2.
Remove the middle and right cover screws
Remove the filter assembly. Use a Phillips screwdriver and remove the two
screws at the top rear of the middle cover. Then remove the two screws for
the right side cover. Remove the laser sled and remove the screw on the
side of the cover.
This document contains confidential or proprietary information of Thermo Fisher Scientific. Neither this
document nor the information therein is to be reproduced, distributed, used or disclosed, either in whole or
in part, except as specifically authorized by Thermo Fisher Scientific.
3/24/2014
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DXR-007 Replacing the Beam Blocker Assembly
3.
Revision 01
Remove the top stage cover
Unscrew and remove the customer align tool (if installed). Insert a large flat
blade screwdriver into the slot and rotate the latch to the horizontal position.
Repeat for the other side.
Turn the slot from vertical to horizontal on both sides
Slide the cover assembly to the front and then lift up to remove
This document contains confidential or proprietary information of Thermo Fisher Scientific. Neither this
document nor the information therein is to be reproduced, distributed, used or disclosed, either in whole or
in part, except as specifically authorized by Thermo Fisher Scientific.
3/24/2014
3
DXR-007 Replacing the Beam Blocker Assembly
4.
Revision 01
Remove the bottom stage cover
The bottom half of the stage cover is secured to the baseplate by two Philips
screws. Remove the three screws that are attaching the plate over the stage
driver box.
With the plate removed, you will see the Philip screw on the left.
This document contains confidential or proprietary information of Thermo Fisher Scientific. Neither this
document nor the information therein is to be reproduced, distributed, used or disclosed, either in whole or
in part, except as specifically authorized by Thermo Fisher Scientific.
3/24/2014
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DXR-007 Replacing the Beam Blocker Assembly
5.
Revision 01
Disconnect the solenoid cable from the flex cable harness
Very carefully squeeze the black tab in the middle of the connector coming
from the solenoids. Then gently disconnect the black connector. Be careful
with the flex cable harness!
6.
Unscrew the beam blocker assembly from the casting
Use a 9/64" Allen wrench and remove the assembly.
7.
Install new beam blocker assembly
Plug the cable into the flex harness and then secure the assembly to the
casting with the two screws.
8.
Replace the middle cover
Replace the middle and right side covers and secure with the two screws.
This document contains confidential or proprietary information of Thermo Fisher Scientific. Neither this
document nor the information therein is to be reproduced, distributed, used or disclosed, either in whole or
in part, except as specifically authorized by Thermo Fisher Scientific.
3/24/2014
5
DXR-007 Replacing the Beam Blocker Assembly
9.
Revision 01
Install customer align tool and align the system
Click on the settings icon and then click Align/Calibrate.
Optimizes the spectrograph fine adjust lenses for maximum signal
Collects neon spectra to perform wavelength calibration
Collects the white light reference used for white light correction
Optimizes the laser fine adjust lenses for maximum polystyrene signal
Calibrates the laser frequency
Checks polystyrene signal to noise and wavelength accuracy
This document contains confidential or proprietary information of Thermo Fisher Scientific. Neither this
document nor the information therein is to be reproduced, distributed, used or disclosed, either in whole or
in part, except as specifically authorized by Thermo Fisher Scientific.
3/24/2014
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DXR-007 Replacing the Beam Blocker Assembly
Revision 01
When the performance check passes, it indicates that the wavelength set
meets or exceeds the customer specifications for signal to noise and
wavelength accuracy.
10. Repeat the align/calibrate process for all gratings and lasers
Repeat this align/calibrate process for all lasers and gratings that are on the
system. If one of the stages does not pass successfully, see the
troubleshooting procedure DXRxi-019 and/or contact Technical Support.
This document contains confidential or proprietary information of Thermo Fisher Scientific. Neither this
document nor the information therein is to be reproduced, distributed, used or disclosed, either in whole or
in part, except as specifically authorized by Thermo Fisher Scientific.
3/24/2014
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