Firstly I have MS2 with V3.0 Board.
All things were going well. Had managed to link up to TunerStudio and transfer software. Next day no connection. I checked the DB9 pins 2 and 3 loop and got the correct response. But when I do the loop through Pins 12 and 13 in the Daughterboard socket - no response.
A little investigating found that Pin 2 on the DB9 is connected to Pin 14 (MAX232 - T1OUT) and Pin 3 on the DB9 is connected to Pin 11 (MAX232 - T1IN). But there is no connection between Pins 11 and 14.
I have now sucked out the solder on these two pins and retested - no change.
I have also scrubbed the base with IPA.
I did find that the jumper between JS10 and IGN had been pierced by one of the tails.
Are there any more checks I should do (ie other components) or am I missing something?.
Cheers
Steve
I think Ive shorted MAX232 Chip
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: I think Ive shorted MAX232 Chip
These pins should not be connected - the MAX232 is a buffer type device. I would check to make sure it's got good power and ground.Yodapom wrote:A little investigating found that Pin 2 on the DB9 is connected to Pin 14 (MAX232 - T1OUT) and Pin 3 on the DB9 is connected to Pin 11 (MAX232 - T1IN). But there is no connection between Pins 11 and 14.
Re: I think Ive shorted MAX232 Chip
Matt,
Sorry for not getting back to the forum, I traced the initial fault to a crook Stim chip. Ive have now replaced it and I also found my D20 was backwards. Not sure why it worked well to start with. I removed the D20 with the intention to replace it and decided incorrectly to see if I actually have power at U5 and I did then it started to drop off....A very small puff of smoke later I think I burnt something else now. What was D20 protecting?? I had thought by removing it I would have been still able to test for power on the U5.
Help!!!!!!
Sorry for not getting back to the forum, I traced the initial fault to a crook Stim chip. Ive have now replaced it and I also found my D20 was backwards. Not sure why it worked well to start with. I removed the D20 with the intention to replace it and decided incorrectly to see if I actually have power at U5 and I did then it started to drop off....A very small puff of smoke later I think I burnt something else now. What was D20 protecting?? I had thought by removing it I would have been still able to test for power on the U5.
Help!!!!!!
-
Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: I think Ive shorted MAX232 Chip
D20 is part of the flyback voltage clamp circuit on injector channel 2.