Electronics > Repair
Series defect on agilent 167xx boards?
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MarkL:
There's also a bunch of inter-dependencies between storage depths, number of active pods, and capture rates to be aware of.  You can read about it in "Channel Count/Memory Depth Tradeoffs" and "Choosing the Sampling Mode" in the Help.

From the Format tab: Help --> On This Window

Dragging around pod groups for assignment is also covered.
darkroom:
There appear to be two versions of the 16754A.  One has no "pulls" on the pod ends, and has rework on it (blue wires, and a big cap).  The other has the pulls on the pod ends, and no rework.
vishaldotgupta:
Dear all

i have a agilent 16720 pattern generator board used with Agilent 16801a logic analyser.

the boards is failing on selft test

internal loopback test
clock test
wait test
interrupt test.

can any share some infomation on where to look for faults
Hamster:
Anybody know what chip the "SRAM Chip 2" is on the 1680AD/1690AD Logic boards are? i have one that is failing, but pulled out the board, and well, i see 32 Ram Chips :( , 4 for each channel.

I assume Chip 2 =  Pods 5/6 , but i had no issues using the channels and the data capture didn't look bad?
MarkL:
So, I assume it's failing self-test?  The self-test probably uses several different bit patterns and maybe your testing did not perturb it enough.

I don't know the mapping, but one thing you could try is forcing a memory chip failure.  You could try lifting a leg on one memory chip at a time and see what is reported.

From some on-line photos, it looks like it uses the Micron 58L64L32F in a 100-pin TQFP.  An easy leg to lift would be on a corner.  Lifting one of the synchronous address (SA) inputs on pin 80, 81, or 100 should cause lots of errors and hopefully show the chip number with the error report.

It's trial and error to find Chip #2, but much easier than replacing a whole chip at a time.
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