Electronics > Repair
ADVANTEST R9211B
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m k:
So POD clock is there, but POD pins are not rational.

Address bits are right and _CS pins left.
So result is the same as Timing display, style is a bit different since clock is 1/10 of internal Timing clock.
CPU pin E is free rolling, so it should be visible somewhere.
Means that HP PODs are not operational anymore.

POD input is registered, so that part is operational, but actual POD data is just noise.
If you want to go forward with the HP you must open it.

Since all combinations are the same there is a good possibility that a supply voltage near PODs has given up.
stfjohn:
I opened the logic analyzer and checked the voltages as per the service manual: they are all perfect! Furthermore, the analyzer passes all the self tests correctly except for pod 2 (which, for some strange reason, is not checked...).
m k:
Next you need to check that needed voltages reach the Pod.
Page 4-6 of Service Manual has a Pod Threshold adjustment.
Check that its voltage is rational.

You can also do one more POD signal test.
Turn Advantest on and wait for the text, no booting, just tap Run when needed.
Put Analyzer Type Timing and leave all POD pins as they are.
Change Timing Format from TTL to User-defined and put threshold away from 1.6V, that is a TTL level.
When threshold is low enough your Waveforms display should start putting out random up and down levels.
When threshold is high enough all POD pins should show straight line of low level.
If POD pins continue showing all up or down, like before you know that the picture is not from POD pins.
stfjohn:
Here voltages checked. All right!
m k:
Leave Format as User-defined and take test pictures when threshold is 1.6V, 6V and 0.4V.
If 1.6V picture is what it should be others are not needed.

If all are the same you can start looking in the machine and figuring out where those POD signals go.
When Advantest is on you can scope POD 01, it's that 1/10 of CPU clock and 40/60 duty cycle, should be different than others.

Check also that IDC connector pins of the machine and POD are as they should.
Maybe somewhere is a cracked solder.

It's also possible that GND between machines has a connection problem.
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