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13.0 Troubleshooting/servicing
It is essential to study the signal flow chart carefully, only then can you hope to isolate problems. By tracing the signal
from input to output jacks, it is possible to locate a problem. If for any reason you are unable to isolate a problem, contact
the D&R Technical Support Department for advice. If the problem cannot be corrected over the phone, D&R will
dispatch a replacement module (ground freight prepaid) the same day. Most problems can be found using logical
thinking and simply replacing socketed integrated circuits.
13.1 Removing a module
The Vision is a complex piece of equipment and some understanding of its internal layout is necessary before removing a
module.
An input module has wiring to the master section and to the XLR connector. All of these wires must be removed before
withdrawing a module from the console. Each module has computer grade connectors for ease of the disconnect.
Turn off the power supply. Remove the cover strips at the top and bottom of the console which are held in place by
magnetic strips. It is often easier to also remove the channels positioned left and right of the module under test.
It is now possible to remove the two module retaining screws and carefully lift the module until the XLR wiring can be
unplugged. Now remove all flat cables from the bottom of the module PCB. At this point extender cables (if ordered)
can be connected or the module can be laid on top of the other modules. It is wise to put some form of protection on
top of the mounted modules to prevent them from being scratched.
The master sections can be removed from the frame in the same way.
Because of the many flat cables on the bottom of the master section, it is wise to remove all retaining screws from all
master sections, and remove the blank module on the right side of the master section. This will allow all the master
modules to be moved slightly without unplugging all the flat cables. A qualified service technician will be able to
service the modules in this way.
Vision manual page:33
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