Fluke 87V displaying "Lead" and sounding beeper when nothing is plugged in

• Fluke 87V displaying "Lead" and sounding beeper when nothing is plugged in
  Posted by king.oslo on 15 Jul, 2012 00:28
• Hello there,
  
  I've got a Fluke 87V.
  
  Today, when I came to switch it on, it began sounding an alarm and display "lead" when I switched it on, despite nothing being plugged into the jacks.
  
  When it turn it to mA or uA, it shuts up.
  
  Is this a common problem? What should I check?
  
  Thank you for your time.
  
  Kind regards,
  Marius
• #1 Reply
  Posted by NiHaoMike on 15 Jul, 2012 00:35
• Use compressed air to blow out any dust.
• #2 Reply
  Posted by king.oslo on 15 Jul, 2012 00:41
• That worked.
  
  Is there optical sensing of the input jack?
  
  Kind regards,
  Marius
• #3 Reply
  Posted by NiHaoMike on 15 Jul, 2012 00:47
• If you take a look at the teardown of the 28 II, yes, it's optical.
• #4 Reply
  Posted by king.oslo on 15 Jul, 2012 00:50
• Thanks!
  
  Kind regards,
  Marius
• #5 Reply
  Posted by alm on 15 Jul, 2012 02:17
• The 28-II may be optical because it's easier to seal, but many other meters (which I believe includes the 87V) measure resistance between two halves of the banana jack. I would clean the jacks with either compressed air or a Q-tip with isopropanol.
• #6 Reply
  Posted by Louis_C on 14 Mar, 2024 16:20
• There is also one other thing to look at when you have a unit with this issue. After taking the unit apart have the board face you like normal. To the right and just above the (+) input terminal is a white ceramic resistor network. Make sure you have NO cold solder joints on the resistor pins or on the board. THAT will fix your issue. Good luck! Lou.