Author Topic: Oh Joy.. reverse engineering  (Read 406 times)

Offline Rx7man

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on: April 29, 2018, 04:34:16 PM
I have a problem with my welder.. suspecting the high power board.. AC generator works, no weld output though, mechanics are fine,.. and of course schematics are "proprietary" and unavailable.. Board has about $200 worth of components, certainly could be designed as a 2 layer with a few vias (no vias, thankfully, that would make tracing harder)

3 layer board, 55 resistors, 25 capacitors, 40 diodes, few rectifiers, half dozen high power transistors, 4 optocouplers, couple op-amps, and about 30 connectors.. I'm just lucky it's a very translucent board and I don't have to probe everything, I can see the center plane through it, and mostly just fine traces there.

Once I get it drawn out I can start troubleshooting and see if it's the control circuitry or the power section that's not working

'94 dually,  67/67 HE351VE, NV5600, ~600hp
'93 ECLB 47RH, new toy truck, H pump project, 1000hp goal, 300K miles
93 XCLB auto, bone stock, 350K miles
93 XCLB 5spd, bone stock, 100K miles


Offline hakcenter

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Reply #1 on: April 29, 2018, 05:03:13 PM
omg is that 45 degree angles in the schematic phase ? noooooooooooooooooooooooo

AMP 2 Corinthians 8:21
For we take thought beforehand and aim to be honest and absolutely above suspicion, not only in the sight of the Lord but also in the sight of men.



Offline Rx7man

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Reply #2 on: April 29, 2018, 06:35:52 PM
yes, yes they are.. I'm trying to make the schematic approximately like the board, or I'll never see it through.. maybe when I'm done I'll make a second copy where I organize everything nicely... and don't have wires going through devices.  As you see, for now, with some of the devices they're just black boxes that look like the physical device.. later I'll fix that too.. maybe.

'94 dually,  67/67 HE351VE, NV5600, ~600hp
'93 ECLB 47RH, new toy truck, H pump project, 1000hp goal, 300K miles
93 XCLB auto, bone stock, 350K miles
93 XCLB 5spd, bone stock, 100K miles


Offline Rx7man

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Reply #3 on: April 29, 2018, 07:14:44 PM
Oh, yeah, I was told it's a 3 layer board.. they're wrong, it's 4 layer..

'94 dually,  67/67 HE351VE, NV5600, ~600hp
'93 ECLB 47RH, new toy truck, H pump project, 1000hp goal, 300K miles
93 XCLB auto, bone stock, 350K miles
93 XCLB 5spd, bone stock, 100K miles


Offline Rx7man

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Reply #4 on: May 01, 2018, 09:50:28 AM
I'm grinding away at it.. nearly done.. Had to desolder 2 of the control relays and an 11 pin transformer..  Really hard to trace the circuits on the center layers if there are devices with continuity.. (hence the need to desolder) they also use a VERY high temp solder, so it took a lot of solder wick, had the iron cranked right up to 500F, and to top it all off, the devices/board have conformal coating on them which makes them hard to work, and it glues things down.. Well, I see the finish line at least!

'94 dually,  67/67 HE351VE, NV5600, ~600hp
'93 ECLB 47RH, new toy truck, H pump project, 1000hp goal, 300K miles
93 XCLB auto, bone stock, 350K miles
93 XCLB 5spd, bone stock, 100K miles


Offline Rx7man

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Reply #5 on: May 02, 2018, 12:12:12 AM
OK.. Does this look better?  that was a dozen hours work.

'94 dually,  67/67 HE351VE, NV5600, ~600hp
'93 ECLB 47RH, new toy truck, H pump project, 1000hp goal, 300K miles
93 XCLB auto, bone stock, 350K miles
93 XCLB 5spd, bone stock, 100K miles


Offline hakcenter

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Reply #6 on: May 02, 2018, 08:05:16 AM
jusss

AMP 2 Corinthians 8:21
For we take thought beforehand and aim to be honest and absolutely above suspicion, not only in the sight of the Lord but also in the sight of men.



Offline Rx7man

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Reply #7 on: May 05, 2018, 12:36:36 AM
hows this?

'94 dually,  67/67 HE351VE, NV5600, ~600hp
'93 ECLB 47RH, new toy truck, H pump project, 1000hp goal, 300K miles
93 XCLB auto, bone stock, 350K miles
93 XCLB 5spd, bone stock, 100K miles


Offline hakcenter

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Reply #8 on: May 05, 2018, 08:24:58 AM
Followable

AMP 2 Corinthians 8:21
For we take thought beforehand and aim to be honest and absolutely above suspicion, not only in the sight of the Lord but also in the sight of men.



Offline Rx7man

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Reply #9 on: May 05, 2018, 11:03:01 PM
I was debating whether I should lay it out with labels for some of the common stuff or actually wire it... couple of them were a pain.. no way to make them not cross all the way across the board

'94 dually,  67/67 HE351VE, NV5600, ~600hp
'93 ECLB 47RH, new toy truck, H pump project, 1000hp goal, 300K miles
93 XCLB auto, bone stock, 350K miles
93 XCLB 5spd, bone stock, 100K miles