Electronics > Repair
ADVANTEST R9211B
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stfjohn:
Following your procedure the usual message "waiting for trigger" appears. When the Advantest is turned off, image 1 (pattern XX8X) appears.
With pattern 9X4X, following your procedure, Image 2 appears.
With pattern XX4X, following your procedure, Image 3 appears.
m k:
I think we can now make an educated guess that _IPLs are stuck down, PODs 13 and 14.
If you like you can try image 2 and 3 again, change Time/Div period to be so long that you can see some changes other than POD 09.

But try Find Patterns Bxxx, Dxxx and Fxxx, no matter the procedure.
If Interrupt Priority Lines are down all the time you'll get empty pictures, or random noise.

So if pictures are empty start finding _IPL0 and _IPL1 traces.
It's also possible that they are not connected, but that's not very likely.
PAL chips are good source candidates.
stfjohn:
Changing the period does not show anything new.
With patterns BXXX DXXX FXXX the image is empty.
How do I find the _IPL0 and _IPL1 traces?
m k:
You can disconnect POD 09 and try finding something new again.
There you must also have Timing Trace Acquisition mode Transitional, wrong mode is Traditional.
Transitional means that only changes are saved, so disconnecting POD 09 will give more space and possibly more Waveforms time.

Finding traces is a hard guessing work, or easy with some luck.
CPU pins 25, 24 and 23, find their connections, in that order, last is less important.
And then possibly connections of input side of those new sources.

You need a decent short circuit tester, regular multimeter is fine if its beeper is fast enough.
Too slow beeper and you must check the reading.
Even if beeper is fast you must still check that all beeps are really shorts.
It's possible that other connections are so close to short that beeper is activated.

It's also a fineline PCB so small flashlight is not bad.
Means that two traces go between CPU pins, so you may need to check closer how the trace is actually connected.

Keep also in mind that a trace can go around something and come back while being under a chip all the time.
stfjohn:
I'm trying, but it's like looking for a needle in a haystack! The pcb is multilayer (more than two layers), so the flashlight is of little use!
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