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power supply PS2521G

Antoan1@...
 

Hi All,
I just wounder if the right group for the PSD2521G power supply. If not please point me to the right group.
it DOA and I found that 5V short to GND. The problem is not from the components but from screw that tighten the GPIB connector the short 5V layer to GND layer.
But I need the schematic to fix the Ch#1 and 2 no put put problems. On Ch#2, -25V short to GND ( 3402 shorts E,C)
Thanks,

Siggi
 

On Fri, Jan 4, 2019 at 8:37 AM Antoan1 via Groups.Io <Antoan1=
yahoo.com@groups.io> wrote:

I just wounder if the right group for the PSD2521G power supply.
Hi Antoan,

I believe the PS2520/2521 supplies were OEM from GW Instek. The GW PPT-3615
looks identical to my PS2520.
I was never able to scare up a schematic for it, but with the hints and
tips from this EEVBlog repair thread <
https://www.eevblog.com/forum/testgear/tektronix-ps2520-triple-output-power-supply-repair-and-calibration/>
and some persistence, I was able to work through the problems in mine.
Seems the DACs are a weak point in these, plus I had logic supply and
opto-coupler problems with mine.
I'm not super-fond of this supply, the UI is quite horrendous and it can
only display read-back for a single channel at a time.

Siggi

Jim Ford
 

Yeah, pet peave of mine: not being able to see voltage and current for all supplies simultaneously.  All power supplies should have this ability.
Jim F


Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: Siggi <siggi@...> Date: 1/4/19 7:02 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] power supply PS2521G
On Fri, Jan 4, 2019 at 8:37 AM Antoan1 via Groups.Io <Antoan1=
yahoo.com@groups.io> wrote:

  I just wounder if the right group for the PSD2521G power supply.
Hi Antoan,

I believe the PS2520/2521 supplies were OEM from GW Instek. The GW PPT-3615
looks identical to my PS2520.
I was never able to scare up a schematic for it, but with the hints and
tips from this EEVBlog repair thread <
https://www.eevblog.com/forum/testgear/tektronix-ps2520-triple-output-power-supply-repair-and-calibration/>
and some persistence, I was able to work through the problems in mine.
Seems the DACs are a weak point in these, plus I had logic supply and
opto-coupler problems with mine.
I'm not super-fond of this supply, the UI is quite horrendous and it can
only display read-back for a single channel at a time.

Siggi

Siggi
 

Ken Eckert
 

I guess it took a while for my post to be approved. Enjoy!

On Friday, July 12, 2019, Siggi <siggi@...> wrote:

The schematics finally turned up. See here: https://www.eevblog.com/forum/
testgear/tektronix-ps2520g-ps2521g-and-gw-instek-ppt-pps-
schematics-and-cal/.