Electronics > Repair

CSA7404B & TDS7404B repair

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charlyd:
Hi i start i new topic about a the upgraded 7000series tektronix scopes.  the B series.
i got in a couple for repair with complicated problems.
problems i want to share but also talk about so everybody can take there benifits from in the future.
at this moment i got on my bench:
 a CSA7404B  with trigger problems  all channels display a zero.
so i suspect the MAX9601 or something arround this chip.
https://www.eevblog.com/forum/testgear/tek-csa7404-repair-project/msg4331338/#msg4331338
..to be continued

a TDS7404B which doesnt boot up fully.
it give me a power faillure on the ACQ processor.
looking for power rails arround the proc.

a TDS7404B which has  311  errors in  Diagnostics  and Misc 512.
the error 311 indicaties memory chips U554 and U754

charlyd:
a question for the TDS7404B with the ACQ processor power failure. 
does anybody by all means maybe know the exact location of the cpu on the acq board  (B version).
i mean a lot of heatsinks are covering the real identity of the chips.

can anybody point me to its location?
on the picture seen below....

from my first view i have two visible chips to discover there identity.  the 4 red circles are channel related, yellow is triggering related and in the Middle of the 4 red circles  i guess a dataplexer. so on the left i see
- MM9618-UCB
- Xilinx Spartan XC2S50

KrudyZ:
I have a spare that I keep for parts for the non-B version of the ACQ board.
There clearly are some differences, but I got the heat sinks off two of the parts, so you can have a look.

charlyd:
@KrudyZ thanks for your reply but i am looking for the acq Processor location on the B version board. not the old board.

so anybody?

KrudyZ:
Are you sure there is one?
I would not expect it to be covered by a heat sink.
It could be off-board or a soft core processor in an FPGA...

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