Tektronix TLA 720, Service Manual

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Mainframe Troubleshooting
4–38
TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
Table 4–5: Failure symptoms and possible causes (cont.)
Symptom Possible causes and recommended action
Monitor display is blank Check that the monitor is connected to the mainframe; replace the cable if necessary.
If portable mainframe display is blank, try connecting external monitor; if both displays are
blank, contact your local Tektronix service center.
External monitor controls turned down; adjust monitor controls for brightness and contrast.
Check the controller BIOS setups for the monitor.
Faulty monitor; contact the vendor of your monitor for corrective action.
Mainframe powers on but does not
complete the power-on sequence Power off mainframe and check that all modules are fully inserted.
If mainframe is a benchtop mainframe, check the status of the SYSTEM FAIL and TEST LEDs
on the benchtop controller. If either LED stays on, contact your local Tektronix service center.
Check the status of the READY and ACCESSED LEDs on the front panel of the application
modules. The READY LED turns on when the module passes the power-on diagnostics and
when the module is ready to communicate with the controller. The ACCESSED LED turns on
any time the controller accesses the module.
Check for disk in floppy disk drive; make sure mainframe boots from the hard disk drive.
Check for faulty module. Remove modules one at a time and power-on the mainframe. If
mainframe completes the power-on sequence, replace faulty module.
Possible software failure or corrupted hard disk; see Software Problems at the beginning of this
chapter.
Power-on diagnostics fail Isolate problem to faulty mainframe or to faulty module. Multiple diagnostic failures across
modules indicate a faulty mainframe. Diagnostic failures confined to an single module most
likely indicate a faulty module. Contact your local Tektronix service center.
Mainframe does not recognize
accessories such as monitor, printer,
or keyboard Check that accessories are properly connected or installed. Try connecting other standard PC
accessories or contact your local Tektronix service center.
LA Module merge not allowed in TLA
700 Application Merge cable between LA modules not installed.
LA modules are not compatible: TLA 7Nx and TLA 7Px LA modules may not be merged with
TLA 7Lx and TLA 7Mx LA modules.
Refer to the Merge Rules.
Windows 98 comes up but the
TLA 700 application does not Mainframe not set up to start TLA 700 application at power-on. Start application from the
desktop, by double-clicking on the TLA 700 Final Setup icon located on the desktop.
Faulty or corrupt software; reinstall the TLA 700 application software.
Windows 98 comes up in Safe mode Exit the Safe mode and restart the mainframe.
Incompatible hardware and hardware driver software. Either install hardware driver or remove
the incompatible hardware.