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Tek TDS7404 tips about log welcome

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hazelnutsky:
Hello,

I just bought a TDS7404 and it appears I have no trigger on channels 1 and 2 and SPC Fails. So I guess am looking for a trigger chip 156-8278-00.  Where can I get one from ? I am hoping some kindly soul on here will sell me one .

KR, Hazel

squadchannel:
trigger chip is Unobtainium. |O The owner of a non-triggering TDS74xx is always on the road looking for a trigger chip.  :o :o :o

coromonadalix:
@hazelnutsky

yep  have to find them on any tek pcb you may find ....  6k series have them ...


but i would say     check the VxWork  log  while booting  etc ... to be sure  it/they  don't respond to the hardware scan ... , you have an 10 pin idc console port you need to connect to

and theses 7k series may too suffer some eeprom corruption too on acq board,  who may or will spit some errors in SPC tests,  you have to be sure all tests have been done and verified too

and the famous nvram battery who dies, it depends on witch chip version you have, and if it died   you lost some configs and need to put them back  if tekscope crash while starting,   if not   you may be lucky ...

you have an huge tds7k serie thread here
https://www.eevblog.com/forum/testgear/tek-csa7404-repair-project/

and another thread
https://www.eevblog.com/forum/repair/tek-tds7404-calibration-debugging/

pls  dont double post, if you are tempted, you'll not be loved

hazelnutsky:
I guess I _could_ start a new thread for this.  I built an RS232 interface, and now I can see this , which I think means the NVRAM is dead?

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                               CPU: Tektronix HPP - PowerPC 740.  Processor #0.
                              Memory Size: 0x2000000.  BSP version 1.0.8.0 .
                             WDB: Ready.

tcsTableUnpack: checksum failed on buffer
tcsTableLoadFromNVRAM: tcsTableUnpack failed
KERNEL: THERMAL CONTROL INITIATED
" [ Attachment Invalid Or Does Not Exist ]

coromonadalix:
change the battery if possible  and in the big thread you have  a 7404 config i had to rebuild ...

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