From Newsgroup: comp.sys.ibm.ps2.hardware

It seems the power supply in my 520 server is dead. I've removed all
expansion cards and disconnected the RAID board and drives from the
power supply. Still no sign of life.

I suppose after 30 years, the manufacturer can't be blamed. Professional repair or replacement through a retailer is out of the question due to
cost and/or availability.

I can think of three possible solutions.

A. Theoretically, I could use a 9595 power supply, which offers
compatible connectors and comparable power. Unfortunately, it would blow
hot air into the case. Not ideal.

B. The power supply for the PC Server 5x0 series has a connector for Microchannel motherboards. IBM included an adapter board in the 520 case
that can power an AT motherboard (not ATX!). So, theoretically, an AT
power supply should also work, provided I had a reliable one.

C. Then there are ATX2AT adapter cables, which allow you to connect an
ATX power supply to the motherboard. Powerful, energy-efficient, and
quiet ATX power supplies are relatively inexpensive.

Of course, the adapter cable also has a drawback. Modern ATX power
supplies don't provide a 5-volt connection for the motherboard. I came
across this information in the adapter cable description. Apparently,
this can cause malfunctions with older sound cards in the ISA slot.

What do you think?
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From Newsgroup: comp.sys.ibm.ps2.hardware

Wolfgang Gehl wrote:

What do you think?

Wow, I haven't even looked at the newsgroup since mid-January. If this
was my 520, I would probably go route (A), the 9595 power supply. The
dumping of hot air inside the case is acceptable, lots of space there
and sufficient outflow.
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From Newsgroup: comp.sys.ibm.ps2.hardware

A possumble substitute MIGHT be a 3172 PSU, of course czech the 120/240
input.

IBM 60G3943 3172 POWER SUPPLY 3172-003 API-3170 200-240V https://www.ebay.com/itm/142181177328

This one has AC input of 200-240 Vac, 50/60 Hz

P/N 60G3943
+5v, 40.0 A
+12v, 11.0 A
-12v, 1.5 A





Rick Ekblaw wrote:

Wolfgang Gehl wrote:

What do you think?

Wow, I haven't even looked at the newsgroup since mid-January.  If this
was my 520, I would probably go route (A), the 9595 power supply.  The dumping of hot air inside the case is acceptable, lots of space there
and sufficient outflow.

--- Synchronet 3.21f-Linux NewsLink 1.2

From Newsgroup: comp.sys.ibm.ps2.hardware

Onan unit
https://www.ebay.com/itm/142181177107

Louis Ohland wrote:

A possumble substitute MIGHT be a 3172 PSU, of course czech the 120/240 input.

IBM 60G3943 3172 POWER SUPPLY 3172-003 API-3170 200-240V https://www.ebay.com/itm/142181177328

This one has AC input of 200-240 Vac, 50/60 Hz

P/N 60G3943
+5v, 40.0 A
+12v, 11.0 A
-12v, 1.5 A

Rick Ekblaw wrote:

Wolfgang Gehl wrote:

What do you think?

Wow, I haven't even looked at the newsgroup since mid-January.  If
this was my 520, I would probably go route (A), the 9595 power
supply.  The dumping of hot air inside the case is acceptable, lots of
space there and sufficient outflow.

--- Synchronet 3.21f-Linux NewsLink 1.2

From Newsgroup: comp.sys.ibm.ps2.hardware

https://ardent-tool.com/3172/Power.html

Not much.

Louis Ohland wrote:

Onan unit
https://www.ebay.com/itm/142181177107

Louis Ohland wrote:

A possumble substitute MIGHT be a 3172 PSU, of course czech the
120/240 input.

IBM 60G3943 3172 POWER SUPPLY 3172-003 API-3170 200-240V
https://www.ebay.com/itm/142181177328

This one has AC input of 200-240 Vac, 50/60 Hz

P/N 60G3943
+5v, 40.0 A
+12v, 11.0 A
-12v, 1.5 A





Rick Ekblaw wrote:

Wolfgang Gehl wrote:

What do you think?

Wow, I haven't even looked at the newsgroup since mid-January.  If
this was my 520, I would probably go route (A), the 9595 power
supply.  The dumping of hot air inside the case is acceptable, lots
of space there and sufficient outflow.

--- Synchronet 3.21f-Linux NewsLink 1.2

From Newsgroup: comp.sys.ibm.ps2.hardware

Model 1 - 200 - 240 V AC input voltage.

Model 2 - switchable power supply 110 or 220 V AC.

Model 3 - 200 - 240 V AC input voltage.



Louis Ohland wrote:

Onan unit
https://www.ebay.com/itm/142181177107

Louis Ohland wrote:

A possumble substitute MIGHT be a 3172 PSU, of course czech the
120/240 input.

IBM 60G3943 3172 POWER SUPPLY 3172-003 API-3170 200-240V
https://www.ebay.com/itm/142181177328

This one has AC input of 200-240 Vac, 50/60 Hz

P/N 60G3943
+5v, 40.0 A
+12v, 11.0 A
-12v, 1.5 A





Rick Ekblaw wrote:

Wolfgang Gehl wrote:

What do you think?

Wow, I haven't even looked at the newsgroup since mid-January.  If
this was my 520, I would probably go route (A), the 9595 power
supply.  The dumping of hot air inside the case is acceptable, lots
of space there and sufficient outflow.

--- Synchronet 3.21f-Linux NewsLink 1.2

From Newsgroup: comp.sys.ibm.ps2.hardware

Hi

if you're handy with a soldering iron and multimeter wy not try to
repair it?
remove the power supply, discharge the filter caps (big CAPS) use a car
light bulb, test the bridge rectifier, then the filter caps (look on
youtube on how to), then test the transformer/s, once finished still no
go , check the switch transistors, still no go, check the little caps associated with the switch transistors.

make sure you do the testing while the psu is not connected to the main
power, and off course use this info at your own risk and costs :-)

5 out 10 usually are the switch transistors and associated components.

On 22/2/26 23:35, Wolfgang Gehl wrote:

It seems the power supply in my 520 server is dead. I've removed all expansion cards and disconnected the RAID board and drives from the
power supply. Still no sign of life.

I suppose after 30 years, the manufacturer can't be blamed. Professional repair or replacement through a retailer is out of the question due to
cost and/or availability.

I can think of three possible solutions.

A. Theoretically, I could use a 9595 power supply, which offers
compatible connectors and comparable power. Unfortunately, it would blow
hot air into the case. Not ideal.

B. The power supply for the PC Server 5x0 series has a connector for Microchannel motherboards. IBM included an adapter board in the 520 case that can power an AT motherboard (not ATX!). So, theoretically, an AT
power supply should also work, provided I had a reliable one.

C. Then there are ATX2AT adapter cables, which allow you to connect an
ATX power supply to the motherboard. Powerful, energy-efficient, and
quiet ATX power supplies are relatively inexpensive.

Of course, the adapter cable also has a drawback. Modern ATX power
supplies don't provide a 5-volt connection for the motherboard. I came across this information in the adapter cable description. Apparently,
this can cause malfunctions with older sound cards in the ISA slot.

What do you think?

--
Moussa

"People alike with a similar circumstances, tend to find each
others across space and time, given enough time in life, no
matter distance, language, race, colour and believes" (c) MEK
*** Do Not Copy, Duplicate or Use without my Permission ***
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