newbe help new build ms1 v3.0 can't connect to cpu

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mkeigwin
MS/Extra Newbie
Posts: 19
Joined: Thu Feb 19, 2015 8:59 am
Location: Marietta Ga

newbe help new build ms1 v3.0 can't connect to cpu

Post by mkeigwin »

Ok i have a new build ms1 v3.0 blue board , i have only built the power supply and the rs232 port so far , just testing and will move on with i finish and have passed all test ,
some more back ground , this is the 2nd board, 1st one i broke trying to desolder i part .
theses are the voltages that i have when testing

s12 11.39v
s12c 10.71v
q9 11.38v
q12 11.39v
D3 11.38v
Left u5 10.71v
d9 5.06v
s5 5.06v
proto holes 5.06v
right U5 5.06v
D19 5.06v
"CPU Pin 1
" 5.06v
"CPU Pin 20
" 5.06v
cpu pin 31 5.06v

On CPU Pin 11 i get 4.01 volts?
On CPU Pin 12 i get 4.01 volts?
1987 BMW 325 Cabrio , Sold
1998 VW cabrio, Need to Sell
2015 Ram 1500 CrewCab Eco Diesel
2003 Mini Copper S 6 speed BRG
elutionsdesign
Super MS/Extra'er
Posts: 1341
Joined: Mon Sep 05, 2011 1:20 pm

Re: newbe help new build ms1 v3.0 can't connect to cpu

Post by elutionsdesign »

Are you sure it is pin 11 and 12 and not pin 12 and 13? 12 and 13 are the Tx, Rx for the serial connection.
Graduate of EFI University.

I build, repair, install and tune Megasquirt systems in North Dakota and beyond!
mkeigwin
MS/Extra Newbie
Posts: 19
Joined: Thu Feb 19, 2015 8:59 am
Location: Marietta Ga

Re: newbe help new build ms1 v3.0 can't connect to cpu

Post by mkeigwin »

i will check this & get back,
Check this and you were right i have voltage on pin 12 /13
1987 BMW 325 Cabrio , Sold
1998 VW cabrio, Need to Sell
2015 Ram 1500 CrewCab Eco Diesel
2003 Mini Copper S 6 speed BRG
elutionsdesign
Super MS/Extra'er
Posts: 1341
Joined: Mon Sep 05, 2011 1:20 pm

Re: newbe help new build ms1 v3.0 can't connect to cpu

Post by elutionsdesign »

Then all is well. You do need the clock circuit for the MS1 processor in order to connect.
Graduate of EFI University.

I build, repair, install and tune Megasquirt systems in North Dakota and beyond!
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