Tech Edge WBO2 Forum

Skullforce · Newbie Joined: 02 Aug 2009 Posts: 5

i thought i found a pattern to this, but now i doubt it. I power everything up, TE first on the display, then 'nd' reset power (quickly off the terminal and back on) 'nd' again, and again then sometimes it connects fine. occasionally it will stay working for 3 or 4 resets, then go back to nd, no real pattern though. wiggling cables has no effect, and this is witnessed bench tested from a fully charged battery same as when mounted on vehicle.
I've successfully reapplied the firmware to both the 2y1 and to the LD02.
What is odd, is sometimes the ld02 shows 'nd' but the pc software is communicating fine with the 2y, reading maps etc.

any thoughts?

ohh, 5.00v on hin202 in the 2y, p15/p13 gnd link added and tested.
and 5.03v on hin202 in the LD02.

the grounding of pin 13/15 etc, is it applicable to the ld02 also?

Thomas · Expert Joined: 03 Aug 2008 Posts: 208 Location: Germany

Hi.
I encountered the same issue. Just replace the HIN202 in the 2Y1 unit with a MAX202 and it will (hopefully) work.
Thomas

Skullforce · Newbie Joined: 02 Aug 2009 Posts: 5

Skullforce · Newbie Joined: 02 Aug 2009 Posts: 5

Just another thought, we are using these devices at their 'limits' ie minimum 5v VSS, and minimum rated capacitors, running 2 output simultaneously, What if the HIN202 is less efficent with the 100n caps, maybe 200n would prove more reliable for the 4 involved in the charge pump and the v+ v- simulated 10v rails..

Thomas · Expert Joined: 03 Aug 2008 Posts: 208 Location: Germany

Yeah, its right that 202 and 232 are similair. The max202 runs with smaller charge pump capacitors. I noticed that even the max232 works well although the capacitors are too small referring to the datasheet.
I think the te staff is trying so save money in the wrong thing at this point. However...its a simple (and quite cheap) "upgrade" that solves many issues...
Thomas

Skullforce · Newbie Joined: 02 Aug 2009 Posts: 5

I'm going to order a MAX202 and 4 150n caps, and i'll try the caps first just to see if its the issue. Then i'll swap out to the MAX anyway because its superior.

Masi_K · Newbie Joined: 13 Apr 2009 Posts: 20

Thomas · Expert Joined: 03 Aug 2008 Posts: 208 Location: Germany

Hi Masi.
Normally, you just have to swap the HIN202 to MAX202 and it should work. The HIN.... is a substitute for the MAX.... type. >This always is recommended if you see "nd" on the display. To my experience, its enough to swap the HIN202 in the WBO unit.
Thomas

Masi_K · Newbie Joined: 13 Apr 2009 Posts: 20

Okay, fetchin max232. Lets see what happends Smile

Edit: Max232 went in and we will see does it do the trick.

Masi_K · Newbie Joined: 13 Apr 2009 Posts: 20

Yep, it does it partially Sad

When connecting pc running winlog, nd flashes on display and actual reading comes back ok. Next when trying to download log data from unit, nd flashes again and winlog shows no data.. THIS IS ANNOYING! So this rs232 system fails on load. How about these capasitors? They are as max232 datasheet shows.

Masi_K · Newbie Joined: 13 Apr 2009 Posts: 20

How about using steering diode thingy from 2a0? Would it help ?

E: What if there is some kind voltage drop etc somewhere on serial system ?

E2: I compared schematics 2a0 between 2y0 and found nothing different expect internal steering diodes. But I'm not electrician. Biggest difference to the 2a0's serial is that it seems to work. Wish I could test this now Sad