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email(at)jaredyates.com
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 Posted: Sat Jan 01, 2011 7:58 pm Post subject: Questions about the 9005 Low Voltage Module |
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[quote][b] [quote][b]
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email(at)jaredyates.com
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| Posted: Sun Jan 02, 2011 6:02 am Post subject: Questions about the 9005 Low Voltage Module |
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Thanks Bob! Here are the readings that I get. Battery Voltage this morning is 12.3.
U107 Pin 1: 0
U107 Pin 2: 2.38
U107 Pin 3: .68
U107 Pin 4: 0
U107 Pin 7: 11.24
U107 Pin 8: 11.49
U110 Pin 1: 0
U110 Pin 2: 10.77
U110 Pin 3: 0
U110 Pin 4: 11.49
U110 Pin 5: 7.66
U110 Pin 6: 10.78
U110 Pin 8: 11.49
On Sun, Jan 2, 2011 at 12:52 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote] | Quote: | | With the device under test hooked to your battery in a non-running vehicle. Hook the minus lead of your voltmeter hooked to battery (-). Measure and record the voltages at the following test points: |
[b]
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email(at)jaredyates.com
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| Posted: Mon Jan 03, 2011 5:33 pm Post subject: Questions about the 9005 Low Voltage Module |
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That's great information, thank you for your help! I found the Digikey invoice and I think I might have ordered the wrong part.
The national part is the Digikey LM285Z-2.5-ND
http://www.national.com/ds/LM/LM185-2.5.pdf
The one that I ordered is made by ON Semiconductor, Digikey LM285Z-2.5GOS-ND.
http://www.onsemi.com/pub_link/Collateral/LM285-D.PDF
I installed it with the flat side oriented as in the pictures, but didn't bother to check the spec sheets. National numbers the pins from right to left, as you pictured below. The ON Numbers them from left to right. The symbology with regards to the shape of the device seems to be the same between the two, so I'm not sure if the pin numbers are related to function or not. Now that I look at the descriptions, the ON is called a "DIODE REG MICROPWR 2.5V TO-92" while the National is called "IC VOLT REF MICROPWR 2.5V TO92-3." Does it look like that inadvertent substitution would be responsible here? In the worst case, I can order one of the National parts and execute the "snip and swap" as you describe.
On Mon, Jan 3, 2011 at 9:31 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote] At 07:57 AM 1/2/2011, you wrote:
| Quote: | Thanks Bob! Here are the readings that I get. Battery Voltage this morning is 12.3.
U107 Pin 1: 0
U107 Pin 2: 2.38
U107 Pin 3: .68
U107 Pin 4: 0
U107 Pin 7: 11.24
U107 Pin 8: 11.49
U110 Pin 1: 0
U110 Pin 2: 10.77
U110 Pin 3: 0
U110 Pin 4: 11.49
U110 Pin 5: 7.66
U110 Pin 6: 10.78
U110 Pin 8: 11.49 |
Okay, all of the voltages you've measured are expected
values with one exception. Pin 3 of U107 voltage is
established by the voltage reference Z103 and SHOULD
be within 30 millivolts or so of 2.50 volts.
http://www.national.com/ds/LM/LM185-2.5.pdf
The fact that you're reading only .68 volts suggests
that Z013 is installed wrong. See data sheet for pinout
orientation . . .
[img]http://mail.google.com/a/jaredyates.com/?ui=2&ik=294e56abbb&view=att&th=12d4c59ffb13164c&attid=0.1&disp=emb&zw[/img]
Note that the image is a BOTTOM view
of the device. The pictures for assembly of
the 9005 show the flat side of the device
pointed toward the power transistor location.
If you determine that the device IS
installed wrong you should consider the
best way to replace it. If you have the tools
and experience to removed parts from a plated
thru hole board, you have a high probability
of re-using the original part.
I very seldom pull a part off a board with
any notion of reusing it. The value of the
part is usually pretty small compared to the
value of the whole. I usually clip the leads
on the part to be removed so that they can
be taken out of the holes one at a time thus
minimizing hazard to the board.
Bob . . .
[b]
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retasker(at)optonline.net
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| Posted: Mon Jan 03, 2011 7:09 pm Post subject: Questions about the 9005 Low Voltage Module |
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Functionally, these are exactly the same parts. For some reason they
chose to number the pins just the opposite of each other. However, if
you installed it so that the flat is in the same orientation they would
operate exactly the same. If you installed it based on the pin
numbering, then that would be a problem.
Dick Tasker
Jared Yates wrote:
| Quote: | That's great information, thank you for your help! I found the
Digikey invoice and I think I might have ordered the wrong part.
The national part is the Digikey LM285Z-2.5-ND
http://www.national.com/ds/LM/LM185-2.5.pdf
The one that I ordered is made by ON Semiconductor, Digikey
LM285Z-2.5GOS-ND.
http://www.onsemi.com/pub_link/Collateral/LM285-D.PDF
I installed it with the flat side oriented as in the pictures, but
didn't bother to check the spec sheets. National numbers the pins
from right to left, as you pictured below. The ON Numbers them from
left to right. The symbology with regards to the shape of the device
seems to be the same between the two, so I'm not sure if the pin
numbers are related to function or not. Now that I look at the
descriptions, the ON is called a "DIODE REG MICROPWR 2.5V TO-92" while
the National is called "IC VOLT REF MICROPWR 2.5V TO92-3." Does it
look like that inadvertent substitution would be responsible here? In
the worst case, I can order one of the National parts and execute the
"snip and swap" as you describe.
On Mon, Jan 3, 2011 at 9:31 AM, Robert L. Nuckolls, III
<nuckolls.bob(at)aeroelectric.com <mailto:nuckolls.bob(at)aeroelectric.com>>
wrote:
At 07:57 AM 1/2/2011, you wrote:
> Thanks Bob! Here are the readings that I get. Battery Voltage
> this morning is 12.3.
>
> U107 Pin 1: 0
> U107 Pin 2: 2.38
> U107 Pin 3: .68
> U107 Pin 4: 0
> U107 Pin 7: 11.24
> U107 Pin 8: 11.49
>
> U110 Pin 1: 0
> U110 Pin 2: 10.77
> U110 Pin 3: 0
> U110 Pin 4: 11.49
> U110 Pin 5: 7.66
> U110 Pin 6: 10.78
> U110 Pin 8: 11.49
Okay, all of the voltages you've measured are expected
values with one exception. Pin 3 of U107 voltage is
established by the voltage reference Z103 and SHOULD
be within 30 millivolts or so of 2.50 volts.
http://www.national.com/ds/LM/LM185-2.5.pdf
The fact that you're reading only .68 volts suggests
that Z013 is installed wrong. See data sheet for pinout
orientation . . .
Emacs!
Note that the image is a BOTTOM view
of the device. The pictures for assembly of
the 9005 show the flat side of the device
pointed toward the power transistor location.
If you determine that the device IS
installed wrong you should consider the
best way to replace it. If you have the tools
and experience to removed parts from a plated
thru hole board, you have a high probability
of re-using the original part.
I very seldom pull a part off a board with
any notion of reusing it. The value of the
part is usually pretty small compared to the
value of the whole. I usually clip the leads
on the part to be removed so that they can
be taken out of the holes one at a time thus
minimizing hazard to the board.
Bob . . .
*
*
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that a significant number of electrons may have been temporarily inconvenienced.
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email(at)jaredyates.com
Guest
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| Posted: Tue Jan 04, 2011 4:03 pm Post subject: Questions about the 9005 Low Voltage Module |
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Here's a picture. I think the resistors are right, but perhaps I'm
overlooking something that will seem obvious to someone with more
experience.
On Tue, Jan 4, 2011 at 10:11 AM, Robert L. Nuckolls, III
<nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: | At 09:28 PM 1/3/2011, you wrote:
That's great information, thank you for your help! I found the Digikey
invoice and I think I might have ordered the wrong part.
The national part is the Digikey LM285Z-2.5-ND
http://www.national.com/ds/LM/LM185-2.5.pdf
The one that I ordered is made by ON Semiconductor, Digikey
LM285Z-2.5GOS-ND.
http://www.onsemi.com/pub_link/Collateral/LM285-D.PDF
I don't think so. The LM series devices are National
Semiconductor originations. All competing manufacturers
have to put out a drop in duplicate of the part.
If the voltage at U107-3 had been zero or identical
to an adjacent pin, then I would suspect a solder
splash or an ECB defect often called a 'cat hair'.
The fact that your measurement is unique and way out
of whack for what the LM285 should present suggests
that neither event is in force. You might check
markings or color code for the R104 . . . make sure
it.s a 4.7K and not something higher. Also re-flow
the solder joins on R104. It's extremely rare that a
new part is bad out of the box so if the LM285 is
not installed wrong, we need to explore other possible
causes for U107-3 voltage not to be 2.50 volts.
Bob . . .
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email(at)jaredyates.com
Guest
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| Posted: Sat Jan 08, 2011 6:51 pm Post subject: Questions about the 9005 Low Voltage Module |
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Bob, if you have any spare time, would you be interested in taking a look at this picture to see if anything seems out of order on the 9005 module?
On Tue, Jan 4, 2011 at 6:59 PM, Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)> wrote:
| Quote: | Here's a picture. I think the resistors are right, but perhaps I'm
overlooking something that will seem obvious to someone with more
experience.
On Tue, Jan 4, 2011 at 10:11 AM, Robert L. Nuckolls, III
<nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
> At 09:28 PM 1/3/2011, you wrote:
>
> That's great information, thank you for your help! I found the Digikey
> invoice and I think I might have ordered the wrong part.
>
> The national part is the Digikey LM285Z-2.5-ND
> http://www.national.com/ds/LM/LM185-2.5.pdf
>
> The one that I ordered is made by ON Semiconductor, Digikey
> LM285Z-2.5GOS-ND.
> http://www.onsemi.com/pub_link/Collateral/LM285-D.PDF
>
>
> I don't think so. The LM series devices are National
> Semiconductor originations. All competing manufacturers
> have to put out a drop in duplicate of the part.
>
> If the voltage at U107-3 had been zero or identical
> to an adjacent pin, then I would suspect a solder
> splash or an ECB defect often called a 'cat hair'.
> The fact that your measurement is unique and way out
> of whack for what the LM285 should present suggests
> that neither event is in force. You might check
> markings or color code for the R104 . . . make sure
> it.s a 4.7K and not something higher. Also re-flow
> the solder joins on R104. It's extremely rare that a
> new part is bad out of the box so if the LM285 is
> not installed wrong, we need to explore other possible
> causes for U107-3 voltage not to be 2.50 volts.
>
>
> Bob . . .
>
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