Hello @ all,
I found your Forum and read about the repair of a TDS from Tektronix.
Cause is, we had in our Laboratory a TDS7104 which run well since 15 years and then suddenly it does not boot.
Screen was:
B: Drive Error
Press F1 to Resume
When F1 was pressed, the Screen
PXE-E61: Media Test failture, check cable
PXE-M0F: Exiting LANDesk (R) Service Agent II
was displayed.
Reboot and press F2 for BIOS it says "Entering BIOS" but it doesnt do it.
So I changed the BIOS Battery and Battery Cap Dallas DS9034PC from the NVRAM, which was empty.
Next I read in the Forum to get the Output from the RS232 Interface onboard, and soldered a Jack to
the MAX232 for communicate with a Terminal Program on the PC.
Now the Problem is, I dont get a valid output from the RS232.... !?!!?
I configurated the RS232 to 9600 Baud and 8N1 but when I switch on the TDS, I get only hieroglyphics... !?!
So I think, the ASCIIs dont interpreted right, and try to change the RS232 Settings and Terminal Settings in multiple types,
but no meaningfull output was generated ... !?!?
With an Oscilloscope the Impulses look good and when I'm send a character I can see the right coded Impulses!
The PPC Board is booting after switch on from ".8" and count normaly up to "L".
After about 10s it boots again from "4" to "L" and so on and on .....
The Harddisk Drive I had check in a other System, it is readable and without Errors.
So I think, the NVRAM has forgotten the correct Address for boot and I must corred it,
but I dont come into the Routine over RS232 because the hieroglyphical Terminaloutput.
When I press a Button on the TDS Keyboard, the charakter was send correct via RS232
and the PPC breaks the Roundbooting Process, as descibed!
Booting up to L is correct, Breaking is correct -> it works,
but i dont see a correct Output.
has anybody an Idea???
thx ahead for help
73, Oliver