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 Post subject: Repairing a Digiplex
PostPosted: Tue Oct 14, 2008 8:28 am 
Digiplex on my Paso 906 did not work correctly cause to intermittent problem on vertical cylinder ignition. :cry:
Therefore, I have opened the box and I have detached all connections from circuit to the framebox.
Inside it I found the circuit completely covered with a protective rubber plus 2 big transistors. I suppose the problem was one of final power transistors. I frozen over/around it with electronic circuit refrigerant gas and immediately the vertical cyl begin to run.
Quickly, I run to buy two new transistors (BU931ZP – price € 4.50), replaced it but, with great disappointment, the vertical cyl did not work fine. :cry:
Therefore, without fear, I began to remove delicately, with a toothpick, the rubber from the circuit. :mad:
I found few electronics components under the rubber and many great lines from the transistors to external pin 10 11 12 (pin towards the coils).
When I freeze one of this lines, vertical cyl begin to run. :lol: :lol:
Sure and happy to have solved the problem, I have solder bridge from transistors (which one link to pin 11 - vertical cyl) to external pin and all it has worked. :thumbup:
I Am much happy, Ciao a tutti

P.S. in the afternoon I post same photos


Last edited by Asterix on Tue Oct 14, 2008 1:46 pm, edited 1 time in total.

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 Post subject: Re: Repairing a Digiplex
PostPosted: Tue Oct 14, 2008 9:20 am 
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paso grand pooh-bah

Joined: Thu Jun 21, 2007 12:00 am
Posts: 1441
Location: Gothenburg, SWEDEN
model: 907 I.E.
year: 1991
Well done, thx f sharing!
Looking forward to pics.

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Gert

907 I.E. -91
M900 -97
MTS 1100s -07


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 Post subject: Re: Repairing a Digiplex
PostPosted: Tue Oct 14, 2008 6:55 pm 
Tamburinifan wrote:
Well done, thx f sharing!
Looking forward to pics.

Some pic of Digiplex inside,

circuit without rubber
Image

bridge to solve problem on my digiplex
Image


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 Post subject: Re: Repairing a Digiplex
PostPosted: Tue Oct 14, 2008 11:39 pm 
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paso grand pooh-bah
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Joined: Mon Jul 19, 2004 12:00 am
Posts: 1714
Location: Hudson Valley, NY
model: 750 Paso
year: 1988
This shows the lenghts folks will go to keep their Pasos running.

Help and electrical fool understand something. Why does freezing the circuit make it work??

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Jon

'88 750 Paso * '87 750F1
'04 Multi 1080s * '88 650 Indy
'65 250 Monza - Moto Giro Project

Click HERE--> 750 Paso Tech FAQ
www.desmoducati.org
www.ducatisuite.com


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 Post subject: Re: Repairing a Digiplex
PostPosted: Wed Oct 15, 2008 8:56 am 
jcslocum wrote:
... Why does freezing the circuit make it work??


Often, when defective semiconductors are warm do not work,
also warm defective circuit line (for thermal expansion) are interrupted,
freezing them could momentarily work.
This technique is normally used to find broken off component on electronic circuits.


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 Post subject: Re: Repairing a Digiplex
PostPosted: Wed Oct 15, 2008 9:59 am 
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paso grand pooh-bah

Joined: Thu Jun 21, 2007 12:00 am
Posts: 1441
Location: Gothenburg, SWEDEN
model: 907 I.E.
year: 1991
:thumbup: , FAQ material!
Do you have a wiring schematics of the Digiplex as well?

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Gert

907 I.E. -91
M900 -97
MTS 1100s -07


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 Post subject: Re: Repairing a Digiplex
PostPosted: Wed Oct 15, 2008 12:58 pm 
Tamburinifan wrote:
:thumbup: , FAQ material!
Do you have a wiring schematics of the Digiplex as well?


unfortunately not. I have asked to Magneti Marelli but nobody has answered.


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 Post subject: Re: Repairing a Digiplex
PostPosted: Wed Oct 15, 2008 5:24 pm 
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paso grand pooh-bah

Joined: Thu Jun 21, 2007 12:00 am
Posts: 1441
Location: Gothenburg, SWEDEN
model: 907 I.E.
year: 1991
So how did you know to make additional wire in pic 2?

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Gert

907 I.E. -91
M900 -97
MTS 1100s -07


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 Post subject: Re: Repairing a Digiplex
PostPosted: Wed Oct 15, 2008 6:57 pm 
Tamburinifan wrote:
So how did you know to make additional wire in pic 2?


In italy it is said “FATTORE C” (traslate => “B FACTOR” B=BUM/BUNS/BATTOM), a stroke ok lucky.

Cause intermittent fault, I have tried with same bridge (additional wire) to reinforce
the circuit line toward vertical cylinder transistor and toward external pin 11 (vertical cylinder coil).
In the beginning I suppose the problem was on big line, but little line was broken off, this line carry
signal to base of power transistor
(http://www.datasheetarchive.com/pdf-dat ... 152462.pdf).


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 Post subject: Re: Repairing a Digiplex
PostPosted: Wed Oct 15, 2008 8:43 pm 
Sorry, this is a complete Digiplex pic (by internet)
Transistor are under vacuum device.
Image

transistor location, green line are the original bridge to carry hi current
Image

original bridge
Image


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 Post subject: Re: Repairing a Digiplex
PostPosted: Thu Oct 16, 2008 12:00 am 
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paso grand pooh-bah

Joined: Thu Jun 21, 2007 12:00 am
Posts: 1441
Location: Gothenburg, SWEDEN
model: 907 I.E.
year: 1991
Thx again!
We can probably run our Paso`s forever when guys like you chime in... :)

Do you work w electronics f a living?

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Gert

907 I.E. -91
M900 -97
MTS 1100s -07


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 Post subject: Re: Repairing a Digiplex
PostPosted: Thu Oct 16, 2008 6:34 am 
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paso grand pooh-bah
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Joined: Tue Dec 06, 2005 12:00 am
Posts: 3312
Location: Roma, Italia
model: 907 I.E.
year: 1992
So, if it only was a circuit fault, it could be quite easily redone for a perfect recover...
Great job!
Ciao

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Francesco
Ducati 907IE 1992 Rosso
Ducati 907IE 1993 Nero
Moto Guzzi Galletto 1960 Sabbia


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