Paulj's H5 Phoenix Platform Build

[PaulJ]

Ok, Received the H5's today from @exxos. Box was a little worse for the wear but boards were in great shape. IC11 was orintated correctly and all the bird feed looked good. First issue I looked at was the short under the 19 pin connector. Instead of using a file I had dremel tungsten carbide cutter. My purpose was to remove enough of the hole plating to un-short the trace from pin 21 of the 2149 to pin 2 of the floppy connector and not open that trace or the next trace. So very carefully I remove material from the hole and check if the short cleared. Well when I had removed all the through plating the short still existed. I continued on a little bit at a time checking continuity then repeating. Eventually the short went away on both end points of the trace. Now both end points are open and not connected to anything so a jumper will be needed for this trace. The good news is the second trace that Exxos cut is still intact and not shorted to anything else. So it appears if you are careful you only need to damage one trace. On the strange side the short was much further away from the hole than I would have thought. Its not the trace shorting to the hole plating.

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[exxos]

Very nicely done

[PaulJ]

Went onto the 68901 socket and the D3 D4 reversal. The hardest part was cutting the bottom plate out of the socket without bending the pins. Using the long pointed tip and very small solder worked out very well.

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[PaulJ]

I'm taking the H5 build a little slower since there's no contest this time and I'm still waiting for parts from Harry. I guess I could rob a H4 but I hate to rob a working machine.

[PaulJ]

Well I ran into first pain in the ass fix. I don't know what the vendor used for solder but I doubt it wasn't good ole leaded solder. Had to break up ic6 and still had a tuff time getting some of the leads off the pads. That was some serious nasty sh$t. Won't be doing that on the second board. Had to order a replacement 07's so hope I selected the proper package. To make it a complete evening mouser wouldn't come up on Safari. Finally googled it and some one said they were able to get on with Firefox so I ordered the 07, 3.3v regulators and my missing pins. Time to have a glass of wine.

[exxos]

Yeah it seems to have a insanely high melting temp

[PaulJ]

I converted the large H5 schematic to individual pages per function and put it all in a pdf. Just print it double sided.

Cover.zip

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[sporniket]

thanks for the hard work

Me, I just put the whole pic in a powerpoint, duplicated and scrolled for each slide to not miss something and print on a3 on my office printer. And I need a magnifier then...

[PaulJ]

Getting late here but finally fired up H5#1. Looks like a success first power. Came up with great display and all the stuff one can test with the Atari cart without additional hardware passes, memory, midi, timing, serial, keyboard. Will do additional testing tomorrow. @PhilC didn't run into your rw issue. Maybe your just special or at least lucky.

Prior to stuffing chips.

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Ready for juice.

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Display after power. Nothing gets exceptionally warm... 3.3v regulator running cool but output is 3.59 volts which I attribute to no load.

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Calling it a night. Do some more testing tomorrow.

[sporniket]