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Clansman Personal Unit Commander Fault (resolu)


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In my Ferret, i have a intercom Clansman with new install CBF (commander box fixed) and a  CPU (commander personal unit 5820-99-117-4349) connected with a 10pin cable.

20201116_194625.thumb.jpg.a48b107ad0b611c083a75a8b23e00fd7.jpg   20201116_194752.thumb.jpg.6f4e05df56bf7a2ea2ef8e2e94c160c8.jpg   20201115_175005.thumb.jpg.1c4731c69286649681e0622ed99ed31d.jpg


The Commanders 10pt cable was broken

       20201113_123148.thumb.jpg.b9001d10d20bc75792c135546873d2c6.jpg   20201113_123204.jpg      also  I have repaired this  pin to pin (A2A; .B2B;..........; K2K;J2J)


Its a picture of my CPU--> 20201119_123911.thumb.jpg.db33a709e9192a5912ddcc4a49290188.jpg

When i connect all, it s OK , I have a 500mA of consumption in circuit, no problem when i turn a CPU's monitor switch or CPU's radio selector .But  I have  a short circuit fault when i use the press to talk button of CPU. (I have already burnt 2 fuses)

Now for test,  I use a laboratory power supply with Amp regulation.

I have make a another test with a new CBF but  I have a same fault.

I don't understand the breakdown. 

Does somebody have an idea?


Edited by Bibulgomme
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Today ,I continue my investigations with an many electrical mesures and control  to determine a basic wiring diagram



5820 99 117 4349


Mesures and control on CPU: (radio selector= RIC,RA,RB,RC and  monitor switch O or Ø)

Side Connector 7pt-F Audio                                              Connector 10pt-M Commander              

Aa            Intercom microphone +VE                        

Ba            Intercom microphone –VE                                Ec       

Da            Left earphone                                                          Bc

Ea            Earphone and PTT ground                               (if RIC=Kc; if RA=KcJc ;if RB=KcAc ;
                                                                                                             if RC=KcJcAc)+IfØ=Cc


Fa             PTT when 1600ohm to ground                  NON Connected

Ga            Right earphone                                             ifO=Bc ifØ=Dc


Hypothèse déduites:

Connecteur 10 pt-M commander                                                                      


Bc left erphone                                                            

Cc = K  ifØ 


Ec Intercom microphone – VE                                   



Hc  if Press TT =Kc+Bc ifØ




Connecteur 10 pt-M box fixed                                                                      


Bb  A set micro +ve






H+28 supply




what I understand, when I press a PTT of CPU  i make i short circuit betwen H and K of CBF.

Now, it seems that the CPU is not compatible with my CBF or I am  not good cable, perhaps  it s nebessary a twisted cable.

do you think there are two CPU systems? 

Or twisted cable?

Edited by Bibulgomme
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 your CPU doesn't seem to be a standard issue one. I had some issues a year ago with a new IB2. When I pressed the over-ride button, the fuse blown off. The reason was two changed cables in the IB2, which were soldered to the wrong position.

I can send you the EMER with the circuit diagram for all Intercom Boxes, if you send me your mail adress as a PM.

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  • 1 month later...


happy end of year holidays everyone.

with Foxtrott363 and other friend help's, I understand the problem origine.

 I use now a CPU n°5820-99-117-5043 (no ANR) for two radios


In the L807 mod  inst No16 the are a Note:

The CPU (ANR) should only used with a CBF (ANR) or CBF (D) (ANR). Use with  CBF or CBF(D) Will cause damage to the harness.

The major difference between CBF (black) and CBF (ANR) is H pin fonction  to 10 pt plug


In a wiring diagram with no (ANR) CBF and CPU , the H pin is in the 0V


Then when I have should use my CPU (no ANR) in  my CBF (ANR), I make a nice short-circuit with the H pin.

My soluce was to transform my CPU no ANR to CPU ANR.

then my first modification has been the wiring diagram n°3 below 

the winring diagram n°2 below is a cabling observed.





This modification (digram n°3) run  but after talking about it with a clansman specialist. The ANR micro dont like a 24V and it must be run with 12-13V supply only.

Then it's necessary to make a 12 power supply regulator in between H ans C pin.


In the CPU (ANR) wiring diagram  above, the 13v regulator is in the red circle but it's 1980's electronic.

I replace this by a L7812 regulator with 2 diode 1N4447 for add 2x0.6V and 1x C1 100nF.




20201226_140209.thumb.jpg.6489e00f3a407fe8fcf64e91ef77886f.jpg    20201226_140512.thumb.jpg.02641e83c89b775c4af1316017e028ac.jpg

yelow paint in the button


Control and test for validation with labo supply in  In Volt regulation.

20201226_143128.thumb.jpg.4c37eb214d716158a6c5461847676c28.jpg 20201226_143211.thumb.jpg.3fbd9e454a3554d55caf6cd83b165a56.jpg

13.2 V between C pin and B pin  of 7PT plug headset

all is OK good work.



There are a low current, only 200mA



Thank you again for the help of Foxtrott363 and Clive without whom I would not have found a soluce.

I hope my research will be useful to other users








Edited by Bibulgomme
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  • Bibulgomme changed the title to Clansman Personal Unit Commander Fault (resolu)

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