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HP8594E power supply 5062-8229

Question asked by oh6lsl on Sep 15, 2011
Latest reply on Sep 5, 2017 by MikkoP

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Hi,

Like anyone knows, there is no schematic available for power supply 5062-8229.

I look a HP8564 power supply schematics, and it is quite same bacically.

This is just information for anyone who have problems with this.

It seems that problem is on the Buck Regulator control board.
NE5560 is not working, or some protection is jamming on/OFF SIGNAL for this ctrl ic.

If I succes to repair this, I will tell you.

BR
Janne
OH6LSL

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omar.neto Sep 19, 2011 11:51 AM
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Hi,
I've also had a problem with power supply 5062-8229 recently:
a tantalum capacitors connected to +15V was burned. I changed it but it didn't work.
I appreciatte if you could send me the schematics of HP8564.
Thanks!
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oh6lsl Nov 6, 2011 8:01 AM
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"
Hi,

Like anyone knows, there is no schematic available for power supply 5062-8229.

I look a HP8564 power supply schematics, and it is quite same bacically.

This is just information for anyone who have problems with this.

It seems that problem is on the Buck Regulator control board.
NE5560 is not working, or some protection is jamming on/OFF SIGNAL for this ctrl ic.

If I succes to repair this, I will tell you.

BR
Janne
OH6LSL
"

Hi!
Last evening, I found the reason, why this power was dead!
a 200K resistor R117 was broken.

You can see the picture, where it is:
http://oh6lsl.kuvat.fi/kuvat/OH6LSL/Mit ... 200K_1.JPG

I hope that someone have same failure. And we get more HP:s alive!

Janne
OH6LSL
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- auato @ oh6lsl on Feb 10, 2013 3:07 PM
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  My 5062-8229 is dead, too. All output voltage are missing. It is aboard of a 8595E spectrum analyzer. I am done: no schematic, no spare parts (i.e. eBay) and I do not see any burnt area or component on the boards. It seems a "mission impossible". Can Janne or someone else send me (by pvt) the similar schematic of the HP8564 and/or to re-post the R117 picture or give me any other comment/tip/help to start my troubleshooting?
  
  Thank you very much.
  
  Ciro
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MikkoP Sep 5, 2017 5:30 AM
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Hi

Replying to an old thread, but I think mine and Janne's experiences with the PSU in question might be useful for someone; the resistor issue Janne first described may actually be quite common. The same resistor R117 failed in my PSU, rendering it totally dead. On the "main PCB", there are two similar 196k resistors in series, and in my PSU the other one has been replaced earlier. Resistors are shown in the photo below. There were no visual cues of the failure.

BR,
Mikko
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HP8594E power supply 5062-8229

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