I have a UPS about 11 years old. It is an IBM OfficePro 700 which is
actually a Tripp-Lite product. Inside on the circuit board it says
66-0546. The web says the Mfr model number is 10K1912.

Not too long ago its yellow light started flashing that says the
batteries are discharged. Because of its age, I assumed the batteries
were worn out so I bought new ones. Unfortunately, after installing
them the problem did not go away.

When plugged in to AC, the unit has its green LED lit which shows it
is getting AC power in. The yellow LED flashes. according to the
manual, "This yellow light will turn ON continuously to indicate that
the UPS's battery is less than fully charged. If it stays on
continuously, contact Tripp-Lite fo service. The light will flash
after you set the 'OFF/ON' Switch to the 'OFF' position to indicate
that the UPS will not provide battery backup during a blackout or
brownout." Regardless of whether I set the OFF/ON switch to OFF or ON,
the yellow light flashes.

There is a Mute/Test switch. If I run the test, the red LED briefly
lights and the alram briefly sounds, as if it tried to switch over to
battery power but there was no power there.

It kind of seems like the charging circuit is not charging the
batteries but I don't know how to test this theory. I left it sit
plugged in for a few days hoping it would charge but it did not.

There are several fuses on the circuit board, all soldered on, and
they all measure zero ohms so I don't think that is the problem. There
are no obviously leaky capacitors or any other components that look
burned up or damaged judging by visual inspection.

I like this UPS and would like to revive it, especially since I spent
money on the new batteries. If anybody could help me diagnose the
problem, tell me where to start, what to check, etc. I would
appreciate it.

All ideas welcome. Thanks in advance.

On Sat, 19 Feb 2011 12:56:57 -0800, martinmarty wrote:

I have a UPS about 11 years old. It is an IBM OfficePro 700 which is
actually a Tripp-Lite product. Inside on the circuit board it says
66-0546. The web says the Mfr model number is 10K1912.

Not too long ago its yellow light started flashing that says the
batteries are discharged. Because of its age, I assumed the batteries
were worn out so I bought new ones. Unfortunately, after installing them
the problem did not go away.

When plugged in to AC, the unit has its green LED lit which shows it is
getting AC power in. The yellow LED flashes. according to the manual,
"This yellow light will turn ON continuously to indicate that the UPS's
battery is less than fully charged. If it stays on continuously, contact
Tripp-Lite fo service. The light will flash after you set the 'OFF/ON'
Switch to the 'OFF' position to indicate that the UPS will not provide
battery backup during a blackout or brownout." Regardless of whether I
set the OFF/ON switch to OFF or ON, the yellow light flashes.

There is a Mute/Test switch. If I run the test, the red LED briefly
lights and the alram briefly sounds, as if it tried to switch over to
battery power but there was no power there.

It kind of seems like the charging circuit is not charging the batteries
but I don't know how to test this theory. I left it sit plugged in for a
few days hoping it would charge but it did not.

There are several fuses on the circuit board, all soldered on, and they
all measure zero ohms so I don't think that is the problem. There are no
obviously leaky capacitors or any other components that look burned up
or damaged judging by visual inspection.

I like this UPS and would like to revive it, especially since I spent
money on the new batteries. If anybody could help me diagnose the
problem, tell me where to start, what to check, etc. I would appreciate
it.

All ideas welcome. Thanks in advance.

The batteries should have come with enough charge to operate the unit or
at least pass the battery test. Make sure the connections are correct.



--
Live Fast, Die Young and Leave a Pretty Corpse

On Feb 19, 4:08*pm, Meat Plow wrote:
On Sat, 19 Feb 2011 12:56:57 -0800, martinmarty wrote:
I have a UPS about 11 years old. It is an IBM OfficePro 700 which is
actually a Tripp-Lite product. Inside on the circuit board it says
66-0546. The web says the Mfr model number is 10K1912.

Not too long ago its yellow light started flashing that says the
batteries are discharged. Because of its age, I assumed the batteries
were worn out so I bought new ones. Unfortunately, after installing them
the problem did not go away.

When plugged in to AC, the unit has its green LED lit which shows it is
getting AC power in. The yellow LED flashes. according to the manual,
"This yellow light will turn ON continuously to indicate that the UPS's
battery is less than fully charged. If it stays on continuously, contact
Tripp-Lite fo service. The light will flash after you set the 'OFF/ON'
Switch to the 'OFF' position to indicate that the UPS will not provide
battery backup during a blackout or brownout." Regardless of whether I
set the OFF/ON switch to OFF or ON, the yellow light flashes.

There is a Mute/Test switch. If I run the test, the red LED briefly
lights and the alram briefly sounds, as if it tried to switch over to
battery power but there was no power there.

It kind of seems like the charging circuit is not charging the batteries
but I don't know how to test this theory. I left it sit plugged in for a
few days hoping it would charge but it did not.

There are several fuses on the circuit board, all soldered on, and they
all measure zero ohms so I don't think that is the problem. There are no
obviously leaky capacitors or any other components that look burned up
or damaged judging by visual inspection.

I like this UPS and would like to revive it, especially since I spent
money on the new batteries. If anybody could help me diagnose the
problem, tell me where to start, what to check, etc. I would appreciate
it.

All ideas welcome. Thanks in advance.

The batteries should have come with enough charge to operate the unit or
at least pass the battery test. Make sure the connections are correct.

--
Live Fast, Die Young and Leave a Pretty Corpse- Hide quoted text -

- Show quoted text -

Thank you for the reply.

The connections are good. When any of the battery connections are
disconnected, I get no lights at all on the front panel. Right now I
have it torn apart enough where I can see all the connections. I have
all connections oriented the same as the batteries I took out. The (2
x 6V) batteries are connected in a series and currently measure
approx. 13.2V total. Thanks.

On Sat, 19 Feb 2011 12:56:57 -0800 (PST), martinmarty
wrote:

I have a UPS about 11 years old. It is an IBM OfficePro 700 which is
actually a Tripp-Lite product. Inside on the circuit board it says
66-0546. The web says the Mfr model number is 10K1912.

Not too long ago its yellow light started flashing that says the
batteries are discharged. Because of its age, I assumed the batteries
were worn out so I bought new ones. Unfortunately, after installing
them the problem did not go away.

I know it's no consolation (or help with your problem now) but any
time a cheap (i.e."desktop/office") UPS shows symptoms of failure the
battery system is the culprit 95% of the time, or more.

When it IS a genuine UPS fault, it is almost always beter to junk it
and buy a new one.

The only way you can tell which is the fault is to jury-rig another
battery to the UPS and see if the symptoms continue. Fortunately most
of this category of UPS use 12V so a spare auto battery will suffice.

(I have a bank of four 12V 100Ah SLA's which I am routinely using to
verify the functionality of assorted UPS' brought here, up to ~6kVA.)

On 20/02/2011 7:56 AM, martinmarty wrote:
I have a UPS about 11 years old. It is an IBM OfficePro 700 which is
actually a Tripp-Lite product. Inside on the circuit board it says
66-0546. The web says the Mfr model number is 10K1912.

Not too long ago its yellow light started flashing that says the
batteries are discharged. Because of its age, I assumed the batteries
were worn out so I bought new ones. Unfortunately, after installing
them the problem did not go away.

When plugged in to AC, the unit has its green LED lit which shows it
is getting AC power in. The yellow LED flashes. according to the
manual, "This yellow light will turn ON continuously to indicate that
the UPS's battery is less than fully charged. If it stays on
continuously, contact Tripp-Lite fo service. The light will flash
after you set the 'OFF/ON' Switch to the 'OFF' position to indicate
that the UPS will not provide battery backup during a blackout or
brownout." Regardless of whether I set the OFF/ON switch to OFF or ON,
the yellow light flashes.

There is a Mute/Test switch. If I run the test, the red LED briefly
lights and the alram briefly sounds, as if it tried to switch over to
battery power but there was no power there.

It kind of seems like the charging circuit is not charging the
batteries but I don't know how to test this theory. I left it sit
plugged in for a few days hoping it would charge but it did not.

There are several fuses on the circuit board, all soldered on, and
they all measure zero ohms so I don't think that is the problem. There
are no obviously leaky capacitors or any other components that look
burned up or damaged judging by visual inspection.

I like this UPS and would like to revive it, especially since I spent
money on the new batteries. If anybody could help me diagnose the
problem, tell me where to start, what to check, etc. I would
appreciate it.

All ideas welcome. Thanks in advance.

From your description it appears that the light is flashing, whereas if
the UPS considered the batteries insufficiently charged, the light would
be constantly on.

I'd check the continuity and connections to the on/off switch, given
that your manual effectively says that the flashing light means that the
switch is in the off position. Make sure the switch continuity actually
changes state, and determine whether it's closed in the "on" position,
or vice-versa (the latter seems unlikely, but best not to assume). Try
to track the connections from that switch back to whatever is looking at
it - probably an IC - could just be a dry joint, or a short, depending
on how the switch is used. If you can track back to an IC pin, you can
check whether it changes state - with suitable care given that you'll
need the battery connected, and this device might start generating mains
voltages at any moment.

Sylvia.

On Feb 19, 7:43*pm, Sylvia Else wrote:
On 20/02/2011 7:56 AM, martinmarty wrote:





I have a UPS about 11 years old. It is an IBM OfficePro 700 which is
actually a Tripp-Lite product. Inside on the circuit board it says
66-0546. The web says the Mfr model number is 10K1912.

Not too long ago its yellow light started flashing that says the
batteries are discharged. Because of its age, I assumed the batteries
were worn out so I bought new ones. Unfortunately, after installing
them the problem did not go away.

When plugged in to AC, the unit has its green LED lit which shows it
is getting AC power in. The yellow LED flashes. according to the
manual, "This yellow light will turn ON continuously to indicate that
the UPS's battery is less than fully charged. If it stays on
continuously, contact Tripp-Lite fo service. The light will flash
after you set the 'OFF/ON' Switch to the 'OFF' position to indicate
that the UPS will not provide battery backup during a blackout or
brownout." Regardless of whether I set the OFF/ON switch to OFF or ON,
the yellow light flashes.

There is a Mute/Test switch. If I run the test, the red LED briefly
lights and the alram briefly sounds, as if it tried to switch over to
battery power but there was no power there.

It kind of seems like the charging circuit is not charging the
batteries but I don't know how to test this theory. I left it sit
plugged in for a few days hoping it would charge but it did not.

There are several fuses on the circuit board, all soldered on, and
they all measure zero ohms so I don't think that is the problem. There
are no obviously leaky capacitors or any other components that look
burned up or damaged judging by visual inspection.

I like this UPS and would like to revive it, especially since I spent
money on the new batteries. If anybody could help me diagnose the
problem, tell me where to start, what to check, etc. I would
appreciate it.

All ideas welcome. Thanks in advance.

*From your description it appears that the light is flashing, whereas if
the UPS considered the batteries insufficiently charged, the light would
be constantly on.

I'd check the continuity and connections to the on/off switch, given
that your manual effectively says that the flashing light means that the
switch is in the off position. Make sure the switch continuity actually
changes state, and determine whether it's closed in the "on" position,
or vice-versa (the latter seems unlikely, but best not to assume). Try
to track the connections from that switch back to whatever is looking at
it - probably an IC - could just be a dry joint, or a short, depending
on how the switch is used. If you can track back to an IC pin, you can
check whether it changes state - with suitable care given that you'll
need the battery connected, and this device might start generating mains
voltages at any moment.

Sylvia.- Hide quoted text -

- Show quoted text -

Monitor the battery voltage with the unit unplugged from the 120V wall/
floor outlet. Then plug it in and turn it on. If there is any
charging going to the batteries, the voltage should show some sort of
an increase, say from 13.2 to 13.5V, at a minimum. Most lead-acid 12V
or 2 x 6V batteries should go up to around 14V when charging at a
medium to high rate. If you don't see the increase in voltage, then
you must check out the charging circuit. Have you contacted the
manufacturer and asked for a circuit diagram. That should really be
your first move.

On Feb 19, 8:43*pm, Sylvia Else wrote:
On 20/02/2011 7:56 AM, martinmarty wrote:





I have a UPS about 11 years old. It is an IBM OfficePro 700 which is
actually a Tripp-Lite product. Inside on the circuit board it says
66-0546. The web says the Mfr model number is 10K1912.

Not too long ago its yellow light started flashing that says the
batteries are discharged. Because of its age, I assumed the batteries
were worn out so I bought new ones. Unfortunately, after installing
them the problem did not go away.

When plugged in to AC, the unit has its green LED lit which shows it
is getting AC power in. The yellow LED flashes. according to the
manual, "This yellow light will turn ON continuously to indicate that
the UPS's battery is less than fully charged. If it stays on
continuously, contact Tripp-Lite fo service. The light will flash
after you set the 'OFF/ON' Switch to the 'OFF' position to indicate
that the UPS will not provide battery backup during a blackout or
brownout." Regardless of whether I set the OFF/ON switch to OFF or ON,
the yellow light flashes.

There is a Mute/Test switch. If I run the test, the red LED briefly
lights and the alram briefly sounds, as if it tried to switch over to
battery power but there was no power there.

It kind of seems like the charging circuit is not charging the
batteries but I don't know how to test this theory. I left it sit
plugged in for a few days hoping it would charge but it did not.

There are several fuses on the circuit board, all soldered on, and
they all measure zero ohms so I don't think that is the problem. There
are no obviously leaky capacitors or any other components that look
burned up or damaged judging by visual inspection.

I like this UPS and would like to revive it, especially since I spent
money on the new batteries. If anybody could help me diagnose the
problem, tell me where to start, what to check, etc. I would
appreciate it.

All ideas welcome. Thanks in advance.

*From your description it appears that the light is flashing, whereas if
the UPS considered the batteries insufficiently charged, the light would
be constantly on.

I'd check the continuity and connections to the on/off switch, given
that your manual effectively says that the flashing light means that the
switch is in the off position. Make sure the switch continuity actually
changes state, and determine whether it's closed in the "on" position,
or vice-versa (the latter seems unlikely, but best not to assume). Try
to track the connections from that switch back to whatever is looking at
it - probably an IC - could just be a dry joint, or a short, depending
on how the switch is used. If you can track back to an IC pin, you can
check whether it changes state - with suitable care given that you'll
need the battery connected, and this device might start generating mains
voltages at any moment.

Sylvia.- Hide quoted text -

- Show quoted text -

THANKS, Sylvia, and thanks to each of you who took the time to try to
help me.

Good call on the flashing light = unit off = bad switch. Problem
solved.

It looks like a typical SPDT slide switch. As I was preparing a state
table of the switch leads to show you all, I thought how unusual it
was that the continuity toggled normally between the "left" and center
poles when the switch was moved, but between the "right" and center
poles it was always open. So I started monkeying around with the
switch and sure enough, at one point I got it just right and got
continuity between the "right" and center. I hooked everything up and
got a green AC indicator with no flashing yellow, just like we wanted.
I plugged in a small load and killed the input power and voila,
battery backup!

I flipped the switch back and forth a bunch of times and now it
actually seems to be working pretty consistently, so at least for the
time being I'm not even going to replace it. If it screws up again it
will be first on the hit list.

I'm glad it turned out to be the switch because the way the board and
components are laid out, I was getting nowhere on tracking the
connections from the switch.

This solved two problems for me:

1) The dead UPS.

2) The dead UPS has been in pieces on my kitchen table since October
and I have parts for a new PC hopefully coming tomorrow, so I needed
to make room for that project.

THANKS AGAIN,
-Marty