B&K 4040 Function Gen Manual??

Discussion in 'Electronics Resources' started by BillB3857, Nov 23, 2014.

  1. BillB3857

    Thread Starter Senior Member

    Feb 28, 2009
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    Does anybody have a service manual for a B&K 4040 (not A or B)? Mine has a burned resistor (R179) and I'm unable to read a value. Also, R177 looks to have been pretty hot, but I think I can see it is a 10 ohm. Both resistors seem to be associated with the power supply. Pics attached....
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
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  3. BillB3857

    Thread Starter Senior Member

    Feb 28, 2009
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    Thanks for the link, but it for the USER'S manual. I'm looking for the SERVICE manual or schematic. Also, the link is for the "A" model. The one I have has no Alpha designation following the 4040 part number.
     
  4. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
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    I would contact B K and see if there was a difference between the A and B models or if they can help you you out in anyway...
     
  5. bertus

    Administrator

    Apr 5, 2008
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  6. BillB3857

    Thread Starter Senior Member

    Feb 28, 2009
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    Thanks for the replies. Sorry to take so long to answer, but Thanksgiving got in the way! I have contacted bkmanuals(.)com to see if the manual they offer is for my unit or one of the newer models. I'll let you know how it turns out.
     
  7. BillB3857

    Thread Starter Senior Member

    Feb 28, 2009
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    Manual available seems to be for my unit and is on order! Thanks for the help.
     
  8. TestDriver1234

    New Member

    May 9, 2016
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    Greetings Beowulf I don't know if you would answer me, but did you fixed the burned resistor? I have exactly the same problem with my 4040A
     
  9. JohnInTX

    Moderator

    Jun 26, 2012
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    Welcome to AAC @TestDriver1234. Normally its best to start a new thread, linking to an old one if relevant. Since you have the same issue, this one is OK.
     
  10. BillB3857

    Thread Starter Senior Member

    Feb 28, 2009
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    The parts list I got says that R179 is an 18 ohm, 5% 1/2W resistor.
     
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  11. TestDriver1234

    New Member

    May 9, 2016
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    Jeez thanks Man, I really needed that data, could you fix your 4040?, It's normal the overheating on the resistor?, I didn't had an 18 ohm resistor, so I placed an 10ohm 5Watt resistor and it heated as hell, what else did you changed after the resistor?, Like I said before, The same resistor was burned in my 4040A too.
     
  12. BillB3857

    Thread Starter Senior Member

    Feb 28, 2009
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    That resistor, being in series with the voltage regulator, provides some level of voltage drop to reduce the wattage load on the regulator. By placing a 10 ohm in rather than the 18, you are placing more stress on the voltage regulator. If the 5W resistor is getting overly hot, you may have a problem further down the line. Time to get the multimeter out and do some voltage/current measurements.
     
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  13. TestDriver1234

    New Member

    May 9, 2016
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    Thanks Man, I already started with measurement, I follow the advice and went also to bk, and asked for the part list. Is huge!!!, but with the schematic I started with the regulations.

    Thanks again for all your help.
     
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