« previous next »
Pages: [1]   Go Down

Author Topic: HP E3615A power supply OVP light wont go away  (Read 1480 times)

0 Members and 1 Guest are viewing this topic.

Offline CaTxTopic starter

  • Newbie
  • Posts: 5
  • Country: us
HP E3615A power supply OVP light wont go away
« on: April 19, 2018, 07:30:09 pm »
Hi,
My HP E3615A power supply has an OVP light that wont go away.  Does anyone know what went wrong and how to fix it?  Thanks.
Logged
 

Offline MadTux

  • Frequent Contributor
  • **
  • Posts: 785
Re: HP E3615A power supply OVP light wont go away
« Reply #1 on: April 19, 2018, 10:06:41 pm »
Does clockwise turning the  the OVP pot in the middle of the front panel solve the problem?  ;D ;D
Logged
 

Offline PedroDaGr8

  • Super Contributor
  • ***
  • Posts: 1283
  • Country: us
  • A sociable geek chemist
Re: HP E3615A power supply OVP light wont go away
« Reply #2 on: April 19, 2018, 10:17:39 pm »
It might not just be the OVP light, if it is triggering the instant that the device powers on, then you need to look at the turn-on overshoot voltage control circuit as well. The service manual has a lot of good data and schematics, plus test points to observe and diagnose. Including a table of tests to perform and diagnosis to make from said test. Way better and easier than me going through it here.
Logged
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves, "You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." -George Carlin
 

Offline CaTxTopic starter

  • Newbie
  • Posts: 5
  • Country: us
Re: HP E3615A power supply OVP light wont go away
« Reply #3 on: April 19, 2018, 11:02:03 pm »
Nope, turning the OVP Adjust wont help.  I am new, so can someone give me pointer.  Following the service manual now, but it seems like a maze.
Logged
 

Offline CaTxTopic starter

  • Newbie
  • Posts: 5
  • Country: us
Re: HP E3615A power supply OVP light wont go away
« Reply #4 on: April 19, 2018, 11:13:26 pm »
R102 = 146.8 Ohms, in specs
R103 = 1.4xx KOhms, and drifting even when powered down

Am I close to catching the culprit?  What is happening with R103?
Logged
 

Offline CaTxTopic starter

  • Newbie
  • Posts: 5
  • Country: us
Re: HP E3615A power supply OVP light wont go away
« Reply #5 on: April 19, 2018, 11:43:27 pm »
Alright, following Table A-7.

Short U19 pin 4 to TP6 --> OVP indicator OFF --> U20 defective or C57 shorted
Logged
 

Offline PedroDaGr8

  • Super Contributor
  • ***
  • Posts: 1283
  • Country: us
  • A sociable geek chemist
Re: HP E3615A power supply OVP light wont go away
« Reply #6 on: April 20, 2018, 04:47:39 pm »
Quote from: CaTx on April 19, 2018, 11:43:27 pm
Alright, following Table A-7.

Short U19 pin 4 to TP6 --> OVP indicator OFF --> U20 defective or C57 shorted

If the indicator went off, that is good news. U20 is an LM393 comparator and C57 is a 50V 47uF electrolytic capacitor. BOTH of those are super cheap to the point that shipping will be WAY more expensive than the part.
Logged
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves, "You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." -George Carlin
 
Pages: [1]   Go Up
« previous next »

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf

 


EEVblog Main Site EEVblog on Youtube EEVblog on Twitter EEVblog on Facebook EEVblog on Odysee