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BMW Icom A2 repair
10-03-2023, 22:35 PM,
Post: #171
RE: BMW Icom A2 repair
RAM Ok
R119 Ok
On dividers, resistance is not measured in-circuit.
Until you remove the error on the fan, the firmware will not be updated.


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10-03-2023, 22:42 PM,
Post: #172
RE: BMW Icom A2 repair
Im not sure where I can find the Fan with 3pins which works on Frequency of 40Hz.
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11-03-2023, 11:18 AM,
Post: #173
RE: BMW Icom A2 repair
(10-03-2023, 22:42 PM)Yah Wrote:  Im not sure where I can find the Fan with 3pins which works on Frequency of 40Hz.

I remembered 200HZ, which is confirmed by the attached picture, and it worked for me!
   

Vojnó
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11-03-2023, 14:44 PM,
Post: #174
RE: BMW Icom A2 repair
Interesting, will give it a try with Pulse Generator and see if it removes the fan error.
Is it fine to leave it attached all the time inside?
Thank you!
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11-03-2023, 17:28 PM,
Post: #175
RE: BMW Icom A2 repair
(11-03-2023, 14:44 PM)Yah Wrote:  Interesting, will give it a try with Pulse Generator and see if it removes the fan error.
Is it fine to leave it attached all the time inside?
Thank you!

I have it all the time, but according to Ferrum, it is sufficient for the time of re-flashing.

Vojnó
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11-03-2023, 17:40 PM,
Post: #176
RE: BMW Icom A2 repair
Very good. One more question, also GND and VCC should be jumped as shown in the picture?
Thank you!
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11-03-2023, 17:58 PM,
Post: #177
RE: BMW Icom A2 repair
(11-03-2023, 17:40 PM)Yah Wrote:  Very good. One more question, also GND and VCC should be jumped as shown in the picture?
Thank you!

Here's another approach:    

Vojnó
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11-03-2023, 18:24 PM,
Post: #178
RE: BMW Icom A2 repair
I know in this side but not sure in Pulse Generator how the PINs are connected.
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11-03-2023, 18:53 PM,
Post: #179
RE: BMW Icom A2 repair
what?
if this is the problem, then there is a big problem!  smile

generator     -     ICOM
  GND                  GND
  OUT                 SPEED
  VCC             (+12V) or +5V

   
The good thing is that the 555 can work from both 12V and 5V!
I just don't know how much voltage the ICOM expects? but I suspect 5V is safe!

Vojnó
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11-03-2023, 22:09 PM,
Post: #180
RE: BMW Icom A2 repair
Thank you! Lets just remove the fan error and update firmware and I will be happy!
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