Mainframe Troubleshooting
TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
4–45
CAUTION.
Do not use the mounting screws to engage the module into the
backplane of the chassis.
The mounting screws will not provide enough force to seat the expansion
module, and you can easily be strip the threads.
Attempting to seat a module using the mounting screws may result in damage to
the chassis.
2. Install the known good expansion module in slot zero of the expansion
chassis.
3. Power-on the benchtop mainframe and check for normal operation.
4. If the failure symptoms are still present with the known good expansion
module installed, the problem is most likely in the expansion mainframe, not
in the expansion module.
5. If your expansion mainframe operates normally with the known good
expansion module installed, then the suspect expansion module needs to be
serviced.
If you do not have a known good expansion module, perform the following
procedure to make sure the expansion mainframe is not the source of the failure:
H
Remove all plug-in modules from the expansion mainframe except the
expansion module.
H
power-on the benchtop mainframe and determine if the expansion mainframe
is recognized by the TLA system.
Another way to isolate problems would be to “trick” the expansion mainframe
into thinking it was a benchtop mainframe. You can do this by removing the
expansion module from the slot zero position in the expansion mainframe and
replacing it with a known good benchtop controller module from your benchtop
mainframe.
Because the expansion mainframe is set up to power-on from a signal from the
expansion module (which is no longer present) you will have to press and hold
the power switch on the expansion mainframe for three to four seconds.
If the expansion mainframe powers-on correctly, the problem can be isolated to
either the expansion module(s) or the expansion cable(s).
Check the Expansion
Mainframe
Replace the Expansion
Module with a Benchtop
Controller Module
Summary of Contents for TLA 720
Page 13: ...Table of Contents viii TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 22: ...Specifications...
Page 23: ......
Page 38: ...Operating Information...
Page 39: ......
Page 105: ...Command Groups 2 66 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 111: ...TEST Subsystem 2 72 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 124: ...Theory of Operation...
Page 125: ......
Page 128: ...Maintenance...
Page 129: ......
Page 155: ...Jumper Settings 4 26 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 178: ...Options...
Page 179: ......
Page 182: ...Diagrams...
Page 183: ......
Page 186: ...Replaceable Mechanical Parts...
Page 187: ......
Page 198: ...Replaceable Parts TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual 7 11...
Page 203: ...Replaceable Parts 7 16 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 204: ...Index...
Page 205: ......
Page 211: ...Index Index 6 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
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