1 Sep
2014
1 Sep
'14
2:30 a.m.
Hello all
Since we got 4 of them, allw ith a broken power supply, I was wondering
if someone has already stumbled upon a solution. i have not open them
yet, but i think the problems are the same on all of them. googling on
hp150 is not the way to go unless you want info for modern devices
having 150 in their names...
--
Met vriendelijke Groet,
Simon Claessen
drukknop.nl
1 Sep
1 Sep
8:11 a.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Simon Claessen
Verzonden: maandag 1 september 2014 11:31
Aan: cctalk at classiccmp.org
Onderwerp: HP 150 power supply
Hello all
Since we got 4 of them, allw ith a broken power supply, I was wondering if
someone has already stumbled upon a solution. i have not open them yet, but i
think the problems are the same on all of them. googling on
hp150 is not the way to go unless you want info for modern devices having 150
in their names...
--
Met vriendelijke Groet,
Simon Claessen
drukknop.nl
Simon,
The PSU aren't very complicated, most likely there's a shortcut on the secondary
side.
Check the rectifiers and elco's on the low voltage side, I've had 2 PSU's with
a shorted 12V rectifier.
They won't start then because the over current protection will prohibit the startup of
the PSU.
Next thing to check is the high voltage rectifier and elco's you should measure about
325V DC after the rectifier after that check the high voltage switching transistors for
shorts.
IIRC the regulator is built from normal op-amps LM339 etc.. and not really suspected,
rectifiers elco's and switching transistors are more likely to fail.
Be careful the 325V is deadly, of possible use a safety transformer when the PSU is
plugged in.
-Rik
8:36 a.m.
I'm not familiar with these machines, never knew they existed. The Wiki
article seems to have good, basic info, though..
But what requires 325V in there - is this for the monitor?
Is it one of those situations where all of the PSU is on-board the monitor,
with the box drawing power over an umbilical - or vice-versa? I ask, as
you're just referring to "the power supply" as if there's only one to
discuss.
On Mon, Sep 1, 2014 at 10:11 AM, Rik Bos <hp-fix at xs4all.nl> wrote:
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org
]
Namens Simon Claessen
Verzonden: maandag 1 september 2014 11:31
Aan: cctalk at classiccmp.org
Onderwerp: HP 150 power supply
Hello all
Since we got 4 of them, allw ith a broken power supply, I was wondering
if
someone has already stumbled upon a solution. i
have not open them yet,
but i
think the problems are the same on all of them.
googling on
hp150 is not the way to go unless you want info for modern devices
having 150
in their names...
--
Met vriendelijke Groet,
Simon Claessen
drukknop.nl
Simon,
The PSU aren't very complicated, most likely there's a shortcut on the
secondary side.
Check the rectifiers and elco's on the low voltage side, I've had 2 PSU's
with a shorted 12V rectifier.
They won't start then because the over current protection will prohibit
the startup of the PSU.
Next thing to check is the high voltage rectifier and elco's you should
measure about 325V DC after the rectifier after that check the high voltage
switching transistors for shorts.
IIRC the regulator is built from normal op-amps LM339 etc.. and not really
suspected, rectifiers elco's and switching transistors are more likely to
fail.
Be careful the 325V is deadly, of possible use a safety transformer when
the PSU is plugged in.
-Rik
9:02 a.m.
325 is rectified mains voltage 230V rms.
-----Oorspronkelijk bericht-----
Van: "drlegendre ." <drlegendre at gmail.com>
Verzonden: ?1-?9-?2014 17:55
Aan: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
Onderwerp: Re: HP 150 power supply
I'm not familiar with these machines, never knew they existed. The Wiki
article seems to have good, basic info, though..
But what requires 325V in there - is this for the monitor?
Is it one of those situations where all of the PSU is on-board the monitor,
with the box drawing power over an umbilical - or vice-versa? I ask, as
you're just referring to "the power supply" as if there's only one to
discuss.
On Mon, Sep 1, 2014 at 10:11 AM, Rik Bos <hp-fix at xs4all.nl> wrote:
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org
]
Namens Simon Claessen
Verzonden: maandag 1 september 2014 11:31
Aan: cctalk at classiccmp.org
Onderwerp: HP 150 power supply
Hello all
Since we got 4 of them, allw ith a broken power supply, I was wondering
if
someone has already stumbled upon a solution. i
have not open them yet,
but i
think the problems are the same on all of them.
googling on
hp150 is not the way to go unless you want info for modern devices
having 150
in their names...
--
Met vriendelijke Groet,
Simon Claessen
drukknop.nl
Simon,
The PSU aren't very complicated, most likely there's a shortcut on the
secondary side.
Check the rectifiers and elco's on the low voltage side, I've had 2 PSU's
with a shorted 12V rectifier.
They won't start then because the over current protection will prohibit
the startup of the PSU.
Next thing to check is the high voltage rectifier and elco's you should
measure about 325V DC after the rectifier after that check the high voltage
switching transistors for shorts.
IIRC the regulator is built from normal op-amps LM339 etc.. and not really
suspected, rectifiers elco's and switching transistors are more likely to
fail.
Be careful the 325V is deadly, of possible use a safety transformer when
the PSU is plugged in.
-Rik
10:55 a.m.
well actually the whole motherboard is in the monitor as well. only the
drives are external.
On 01-09-14 17:36, drlegendre . wrote:
I'm not familiar with these machines, never knew
they existed. The Wiki
article seems to have good, basic info, though..
But what requires 325V in there - is this for the monitor?
Is it one of those situations where all of the PSU is on-board the monitor,
with the box drawing power over an umbilical - or vice-versa? I ask, as
you're just referring to "the power supply" as if there's only one to
discuss.
--
Met vriendelijke Groet,
Simon Claessen
drukknop.nl
11:59 a.m.
I'm not familiar with these machines, never knew they existed. The Wiki
article seems to have good, basic info, though..
But what requires 325V in there - is this for the monitor?
IT's a switch-mode PSU. The noraml design ofr htese (used in the HP150)
starts by rectifying the incoming ASC mains. For 115V mains (USA, etc)
this is a votlage doubler ciruti, ofr 230V mains (Europe, etc) it's a
simple bridge rectifier. The result in either case is about 325-350V DC
_not isolated from the mains_
Is it one of those situations where all of the PSU is on-board the monitor,
with the box drawing power over an umbilical - or vice-versa? I ask, as
you're just referring to "the power supply" as if there's only one to
discuss.
With the HP150, the computer (8088 CPU, RAM. etc) is in the same case as
the monitor, there is one PSU for all parts of that (the monitor section
runts off a 12V power rail, the higher voltages for the CRT come from teh
flyback transformer as usual). This also pwers the keybaord. The disk
drives are separe units with their own internal power supplies.
-tony
8:26 a.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Simon Claessen
Verzonden: maandag 1 september 2014 11:31
Aan: cctalk at classiccmp.org
Onderwerp: HP 150 power supply
Hello all
Since we got 4 of them, allw ith a broken power supply, I was wondering if
someone has already stumbled upon a solution. i have not open them yet, but i
think the problems are the same on all of them. googling on
hp150 is not the way to go unless you want info for modern devices having 150
in their names...
--
Met vriendelijke Groet,
Simon Claessen
drukknop.nl
PS. Check the motherboards for battery leakage, every HP-150 Touchscreen has two N-size
batteries for the realtime clock and cmos ram.
When they hasn't been removed there's a big change they leaked and damaged the
pc-boards, and the power on circuits which also can prevent the PSU to come-up.
http://www.hpmuseum.net/exhibit.php?hwdoc=43
Links to the HP Museum
-Rik
11:38 a.m.
Hello all
Since we got 4 of them, allw ith a broken power supply, I was wondering
What exactly are the sympromts? All PSU poutputs misssng? Does the PSU
seem to be tryign to start up and then shutting down (it'll 'tweet' or
click if it's doing that)? Is the mains fuse intact?
if someone has already stumbled upon a solution. i
have not open them
yet, but i think the problems are the same on all of them. googling on
hp150 is not the way to go unless you want info for modern devices
having 150 in their names...
The HP150 Technical Reference Manual (which AFAIK is not on the web) does
not include the PSU scheamtic. It does include every other scheamtic...
Hwoever, the PSUs in my HP150s are the same as the PSU in my HP120. And
my reverse-egnieered scheamtics for the HP120 are on the Australian
Museum site :
http://www.hpmuseum.net/
Towards the end of the HP120 scheamtics are 4 sheets for the PSU. They
may be applcable.
-tony
3765
days inactive
3765
days old
7 comments
4 participants
participants (4)
-
ard＠p850ug1.demon.co.uk -
drlegendre＠gmail.com -
hp-fix＠xs4all.nl -
simski＠dds.nl