RPSU280A power supply for Strata DK280 phone system schematic wanted.

[Bill Degener]

RPSU280A power supply for Strata DK280 phone system schematic wanted.

Block diagram or schematic would be nice.

 

[Michael A. Terrell]

RPSU280A power supply for Strata DK280 phone system schematic wanted.

Block diagram or schematic would be nice.

First of all, you should give a brand name, not just the model. If
you want to repair it, you need to start with the electrolytic
capacitors. test them for high ESR. Then look for any shorted
semiconductors.



There are several RPSU280A power supplies on Ebay for $25 or less. I
doubt that you can buy the parts for that price.

http://stores.ebay.com/Global-Technology-Solutions_Phones_W0QQfsubZ4

<http://search.ebay.com/search/searc...ftrt=1&ftrv=1&saprclo=&saprchi=&fsop=1&fsoo=1>


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[msg]

If the O.P. intends to repair quantities of defective PSUs, the request
makes sense.

There are several RPSU280A power supplies on Ebay for $25 or less. I
doubt that you can buy the parts for that price.

http://stores.ebay.com/Global-Technology-Solutions_Phones_W0QQfsubZ4

Firm is in my backyard geographically - $25.00 sure is not much for a PSU of
that size and complexity; if one is fortunate to live nearby, serious
shipping costs are avoided, but if the O.P.'s posting IP is any indication,
he would need to make a trip most of the way up I-35 to get it.

Michael

 

[Bill Degener]

RPSU280A power supply for Strata DK280 phone system schematic wanted.

Block diagram or schematic would be nice.

Model: Toshiba Strata DK280 Telephone system.

FIXED!

Cause: Multiple power surges from storm (yea it was on a UPS with 5
computer servers).

Symptom: All power lights erratically blinking, internal circuit
breakers clattering like hell.

Fix:
Re-flowed cold solder joints, cleaned small rails of trace residue
(literally).

Replaced C014 39uf 35v cap (ESR was nuttin) with 33uf 35v (no 39uf
unfortunately) .

Replaced C017 10uf 50v (high ESR). Replaced w/ 10uf 63v).

Replaced C013 47uf 50v with same value (proud of me for that one).

Location: Main board close to daughter board near DSUB pigtail connector.

Regards:
Bill Degener

 

[Bill Degener]

If the O.P. intends to repair quantities of defective PSUs, the request
makes sense.

Firm is in my backyard geographically - $25.00 sure is not much for a
PSU of
that size and complexity; if one is fortunate to live nearby, serious
shipping costs are avoided, but if the O.P.'s posting IP is any indication,
he would need to make a trip most of the way up I-35 to get it.

Michael

Yea, I too saw that same ad on EBAY for $25.00 Then I saw em for around
$ 250.00 and up! Well, it cost me $ 0.75 for some caps and a few bucks
in gas; so anyway all is well again.

Thanks:

Bill Degener

 

[James Sweet]

Model: Toshiba Strata DK280 Telephone system.

FIXED!

Cause: Multiple power surges from storm (yea it was on a UPS with 5
computer servers).

Symptom: All power lights erratically blinking, internal circuit breakers
clattering like hell.

Fix:
Re-flowed cold solder joints, cleaned small rails of trace residue
(literally).

Replaced C014 39uf 35v cap (ESR was nuttin) with 33uf 35v (no 39uf
unfortunately) .

Replaced C017 10uf 50v (high ESR). Replaced w/ 10uf 63v).

Replaced C013 47uf 50v with same value (proud of me for that one).

Location: Main board close to daughter board near DSUB pigtail connector.

Regards:
Bill Degener

Probably had nothing to do with power surges, capacitors fail with age and
heat, solder joints crack, none of that requires external stimulus to occur.

People tend to blame all sorts of faults on power surges, but in reality
electronics are pretty resilient, it's hard to damage something with dirty
power. Lightning strikes are another story, but there's little chance of
stopping that even with the best surge protectors.

 

[Michael A. Terrell]

If the O.P. intends to repair quantities of defective PSUs, the request
makes sense.

I didn't say it didn't make sense. Even if he was going to repair
thousands of those decade old power supplies, having a couple working,
spare reference units couldn't hurt. Just that you are luck to even
find a system manual, let alone service data.
<http://www.wedophones.com/Manuals/Toshiba/Strata DK 280 R3 Installation.pdf>
is the system manual for this series.

Firm is in my backyard geographically - $25.00 sure is not much for a PSU of
that size and complexity; if one is fortunate to live nearby, serious
shipping costs are avoided, but if the O.P.'s posting IP is any indication,
he would need to make a trip most of the way up I-35 to get it.

Michael

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Bill Degener]

Probably had nothing to do with power surges, capacitors fail with age and
heat, solder joints crack, none of that requires external stimulus to occur.

People tend to blame all sorts of faults on power surges, but in reality
electronics are pretty resilient, it's hard to damage something with dirty
power. Lightning strikes are another story, but there's little chance of
stopping that even with the best surge protectors.

I would agree, except I was standing there (with worn out caps and all).
when the power restored, the power supply went schizo. Surge finished
off the one bad cap.

 

[James Sweet]

I would agree, except I was standing there (with worn out caps and all).
when the power restored, the power supply went schizo. Surge finished off
the one bad cap.

I suspect what happened is there were a few dropped cycles as the UPS
changed over, and with the worn out caps the PSU dropped out and was unable
to start back up. Either way the important part is that you got it fixed.

 

[Bill Degener]

I would agree, except I was standing there (with worn out caps and all).
when the power restored, the power supply went schizo. Surge finished
off the one bad cap.

Besides, you know how complex, convoluted, and demented power supplies
(engineering) can be. This thing is big! With that said, there was
still poor regulation causing the caps to prematurely heat, gas and dry out.

 

[Bill Degener]

I suspect what happened is there were a few dropped cycles as the UPS
changed over, and with the worn out caps the PSU dropped out and was unable
to start back up. Either way the important part is that you got it fixed.

Yea, today God likes me.

 

[Bill Degener]

First of all, you should give a brand name, not just the model. If
you want to repair it, you need to start with the electrolytic
capacitors. test them for high ESR. Then look for any shorted
semiconductors.



There are several RPSU280A power supplies on Ebay for $25 or less. I
doubt that you can buy the parts for that price.

http://stores.ebay.com/Global-Technology-Solutions_Phones_W0QQfsubZ4

<http://search.ebay.com/search/searc...ftrt=1&ftrv=1&saprclo=&saprchi=&fsop=1&fsoo=1>

Just sit there and relax. I'll take care of the heavy stuff.

 

[Michael A. Terrell]

Besides, you know how complex, convoluted, and demented power supplies
(engineering) can be. This thing is big! With that said, there was
still poor regulation causing the caps to prematurely heat, gas and dry out.

Have you ever serviced a 5 VDC 1000 A power supply with a three phase
input? THAT is a big power supply.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Ross Herbert]

Using a link posted in another ng you can find a lot of info on the Toshiba
Strata DK series. Unfortunately no PSU circuits.

http://www.wedophones.com/ToshibaManualsLead.htm

Usually, fault finding switch mode psu's (I assume the 280 uses one) is not too
difficult so if you have any electronics repair skills have a go at fixing it.

 

[Ross Herbert]

Ebay
http://cgi.ebay.com/Toshiba-STRATA-...2480479QQcmdZViewItem?IMSfp=TL0802121344a9264

 

[Ross Herbert]

Just in case you need a spare for $25 + delivery.

 

[Bill Degener]

Have you ever serviced a 5 VDC 1000 A power supply with a three phase
input? THAT is a big power supply.

Nope. That'll run a few devices. Telco switching supply I assume?

 

[Bill Degener]

Ebay
http://cgi.ebay.com/Toshiba-STRATA-...2480479QQcmdZViewItem?IMSfp=TL0802121344a9264

It would be nice for a spare and the price is worth it.

I didn't have any output values to work with at the supply. IT has a 10
pin Molex style connector. I found them at the cabinet side behind the
harness. (3) -24v , +5 , and -5v. So that helped out tremendously.

 

[Michael A. Terrell]

Nope. That'll run a few devices. Telco switching supply I assume?

Power supply for a "Vital Industries Squeeze Zoom" One of the first
broadcast quality digital video special effects generators that could
store NTSC video in RAM. It filled a full relay rack, with that power
supply at the bottom.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Michael A. Terrell]

Just sit there and relax. I'll take care of the heavy stuff.

You consider a simple power supply 'heavy stuff'?


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida