Tektronix TLA 704, Service Manual

Page: 96 / 144

Troubleshooting
TLA 704 Color Portable Mainframe Service Manual
6–41
Table 6–2: Failure symptoms and possible causes (Cont.)
Symptom Possible cause(s)
Flat panel display blank
H
Display selection jumper set incorrectly on front panel
interface board (there are no jumpers on the board when
the mainframe is shipped from the factory; this is the correct
default setting)
H
External monitor plugged in (look on external monitor for
display)
H
External monitor plugged in but not powered on
H
Defective cable from front panel interface board to display
adapter board
H
Defective cable from controller board to front panel interface
board
H
Defective cable from inverter board to display adapter board
H
Defective cable from inverter board to backlighting display
lamp
H
Defective backlighting display lamp
H
Faulty display
H
Faulty controller board
H
Faulty inverter board
H
Faulty front panel interface board
Modules not recognized
H
Module firmware incompatible with mainframe software
version. Refer to the TLA 700 Series Installation Manual for
software and module firmware update instructions.
H
TLA 700 system problem. Execute the internal resource
manager program to determine if the mainframe recognizes
any installed modules. Refer to instructions on page 6–48.
H
Faulty module. Refer to appropriate module service manual
for further troubleshooting information.
BIOS error messages
H
Refer to the BIOS error message table on page 6–51
Eliminate Other Problem Sources
The portable mainframe is part of the TLA 700 Series Logic Analyzer, which
comprises modules and one of two mainframes (in this case, the TLA 704 Color
Portable Mainframe). If power-on diagnostics indicate that an LA or DSO
module test failed, troubleshoot the module using the TLA service manual for the
module.