FLUKE 5500A -- Seeking bodge compare to other units; PCNs

[gwideman]

Fluke 5500A aficionados:  I'm looking at a partly non-functioning 5500A and making some progress, but I'd appreciate info you might have on PCNs ("updates"), and the likelihood that one thing I'm looking at is such a PCN, or at least a factory mod.

1.  Does anyone have a list of PCNs?  The unit I have has a sticker which suggests PCNs 4776 and 5072 were installed, and possibly 19422. Any info on those?

2. On the A6 DDS board, I see the following bodge:


The resistor is added and a trace is cut, with the net effect of adding a 390 ohm in series with C63. That is a plausible revision, but the actual implementation is poor -- tearing up a track, and the "hot iron trimming" of nearby C63 0.47uF leaves something to be desired.  Regardless, I wonder if this mod is present on other units?

Thanks!

[Jetecnet]

I don't have that mod on my A6, it looks to be a resistor in series with TP7 (Current error out)
Interesting photo, must be a late version, weird chip numbers.
As regards getting any parts / boards for this from Fluke, pretty much no
JC

[gwideman]

I don't have that mod on my A6, it looks to be a resistor in series with TP7 (Current error out)
Interesting photo, must be a late version, weird chip numbers.

Thanks for your reply.  From the photo it might look like the resistor is in series with TP7, which in a sense it is. However the trace from TP7 that runs under U33  is cut. The net effect is like in the schematic attached.  On the schematic I've relocated TP7 to where I think it actually connects on the board.

And yes, all the ICs that the schematic calls out as DG444DY appear on the board as 92944L1  L018FLA.  I'm inclined to think the former is a date code and the latter a part number, though google finds me neither, and the "44" in 92944 does somewhat match the 4's in DG444DY.