Tektronix TDS6404, Service Manual, Page: 220 / 252

Troubleshooting
6- 70
TDS6000 Series Service Manual
Table 6- 12: DIP switch functions
Test option
Switch
Default Set Description
1 1 Meg RAM test 32 Meg RAM test POST does not know how much DRAM
is installed in the board.
2 Enable phase 2 POST Disable phase 2 POST Use to disable phase 2 of POST.
3 Do not loop on phase 2 POST Loop on entire phase 2 POST This switch is checked at every loop
iteration, so it is possible to break out
of this loop by moving switch 3 to the
default position. You can not loop on a
single passing test.
4 Allow debug output Suppress debug output Used by the console. Checked at every
write operation.
5 Loop on failing test Continue past failing test If a test fails (except DRAM march test)
and switch 6 is set, this switch is
checked. You can break out of the loop
by moving switch 5 to the set position,
removing the fault, or by setting switch
6 to the default position.
6 Stop on failing test Continue past failing test If set and a test fails, the program
checks switch 5. If not set, the program
will stop on a failure by branching to a
loop. To exit the loop, reset the power
PC.
7 Do not cycle application diagnostics Application diagnostic cycle If set, the power-on diagnostics cycle,
which prevents completion of the boot
sequence.
8 Do not force power-up diagnostics Forces power-up diagnostics At power-on this switch is checked, and
if set, power-up diagnostics will run.
Diagnostic LED
Table 6--13 lists the actions performed at power-up of the power pc (PPC) and
the associated display on the diagnostic LED. Until the MPC106 is initialized
the LED is not active. RESET forces the display to .8. H, L, P, and a blinking --
indicate where the program is in the power-up sequence. As tests occur, the
associated number is displayed on the LED. A failing test displays a decimal
point and the test number.