I thought I'd messed up the USB lead of my HP 1020 laserjet , measuring
voltages etc, trying to learn about USB function. Turned out I must have
strained a USB A to B adaptor and nothing wrong with the printer. Is one
rule of thumb (for a suspect USB connection) that a maximum USB insertion
force of 250 gram is too low and above 450 gram is generally good ? ( I
later went around a number of leads /connectors, adaptors with the kitchen
scales).
Anyway inside the printer there were 6 unmarked 2 land SMD lumps marked on
the overlay as E1 to E6 , is E a designation for fuse?, all were 0 ohms
across. There were 2 unmarked green 2 land lumps on the USB lines marked VR
on the overlay, bidirectional transient suppressors ?
and 2 SMD contacting the USB lines marked CR, presumably rectifiers, but can
anyone identify with more certainty
4 land device marked topmark D132
found on topcode listings
D13 AZZ23C8V2 Diode SOT23 dual zener 8.2V 0.3W, 3 pin
related?

2 land device marked WU1
found
WU BZX284-B4V3 Phi I SOD110 0.4W zener 4.3V E24 ±2%, 2 pin
related ?

Generally do truncated 3 and 4 character topcodes have any relation to the
full code ?

N_Cook wrote:

I thought I'd messed up the USB lead of my HP 1020 laserjet , measuring
voltages etc, trying to learn about USB function. Turned out I must have
strained a USB A to B adaptor and nothing wrong with the printer. Is one
rule of thumb (for a suspect USB connection) that a maximum USB insertion
force of 250 gram is too low and above 450 gram is generally good ? ( I
later went around a number of leads /connectors, adaptors with the kitchen
scales).
Anyway inside the printer there were 6 unmarked 2 land SMD lumps marked on
the overlay as E1 to E6 , is E a designation for fuse?, all were 0 ohms
across.


'E' is often used to indicate a connection off the board. They are
probably there for automated testing in a 'Bed of Nails' (AKA: Pogo
Pins) test fixture during the manufacturing process. More and more
manufacturing is moving to this method where boards are handled by
machines from the time the blanks are loaded into a pick & place
machine, till they are ready to be installed in a product.


There were 2 unmarked green 2 land lumps on the USB lines marked VR
on the overlay, bidirectional transient suppressors ?
and 2 SMD contacting the USB lines marked CR, presumably rectifiers, but can
anyone identify with more certainty
4 land device marked topmark D132
found on topcode listings
D13 AZZ23C8V2 Diode SOT23 dual zener 8.2V 0.3W, 3 pin
related?

2 land device marked WU1
found
WU BZX284-B4V3 Phi I SOD110 0.4W zener 4.3V E24 ±2%, 2 pin
related ?

Generally do truncated 3 and 4 character topcodes have any relation to the
full code ?


No. They match the component's location on the schematics and B.O.M.


--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.

On Fri, 7 May 2010 11:19:24 +0100, "N_Cook" put
finger to keyboard and composed:

Anyway inside the printer there were 6 unmarked 2 land SMD lumps marked on
the overlay as E1 to E6 , is E a designation for fuse?, all were 0 ohms
across.

There were 2 unmarked green 2 land lumps on the USB lines marked VR
on the overlay, bidirectional transient suppressors ?

USB ports have short circuit current protection. I believe some may
implement this via polyswitches, or some similar device, eg PTC
resistor (?). Are these devices in series with the supply pins?

and 2 SMD contacting the USB lines marked CR, presumably rectifiers, but can
anyone identify with more certainty

4 land device marked topmark D132
found on topcode listings

CM1213 1, 2, 4, 6 and 8-Channel Low Capacitance ESD Protection Arrays
http://www.datasheetarchive.com/pdf-...DSA-127548.pdf

Yours would be the CM1213-02Sx 2-channel array (D132 marking code). I
suspect that it would be providing ESD protection on each of the D+
and D- pins.

2 land device marked WU1

FWIW, this forum thread ...

http://www.monitorlab.ru/forum/viewt...b8d9 e43e15d4

.... suggests that, in a HP 1020, the WU1 part may be a ...

PESD5V2S2UT Phi A SOT23 Uni-directional ESD Protection 5.2V:
http://www.nxp.com/documents/data_sh...2UT_SERIES.pdf

However it is a 3-pin device.

Generally do truncated 3 and 4 character topcodes have any relation to the
full code ?

In the D132 case, it appears to be true.

13 - 1213
2 - -02


- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Franc Zabkar wrote in message
...
On Fri, 7 May 2010 11:19:24 +0100, "N_Cook" put
finger to keyboard and composed:

Anyway inside the printer there were 6 unmarked 2 land SMD lumps marked
on
the overlay as E1 to E6 , is E a designation for fuse?, all were 0 ohms
across.

There were 2 unmarked green 2 land lumps on the USB lines marked VR
on the overlay, bidirectional transient suppressors ?

USB ports have short circuit current protection. I believe some may
implement this via polyswitches, or some similar device, eg PTC
resistor (?). Are these devices in series with the supply pins?

and 2 SMD contacting the USB lines marked CR, presumably rectifiers, but
can
anyone identify with more certainty

4 land device marked topmark D132
found on topcode listings

CM1213 1, 2, 4, 6 and 8-Channel Low Capacitance ESD Protection Arrays
http://www.datasheetarchive.com/pdf-...DSA-127548.pdf

Yours would be the CM1213-02Sx 2-channel array (D132 marking code). I
suspect that it would be providing ESD protection on each of the D+
and D- pins.

2 land device marked WU1

FWIW, this forum thread ...


http://www.monitorlab.ru/forum/viewt...0466ab2db337cd
6b8d9e43e15d4

... suggests that, in a HP 1020, the WU1 part may be a ...

PESD5V2S2UT Phi A SOT23 Uni-directional ESD Protection 5.2V:
http://www.nxp.com/documents/data_sh...2UT_SERIES.pdf

However it is a 3-pin device.

Generally do truncated 3 and 4 character topcodes have any relation to
the
full code ?

In the D132 case, it appears to be true.

13 - 1213
2 - -02


- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


Thanks for that and more generally I've added
"part marking"
to "top code" "topcode" "top mark" "topmark" as synonym adjunct keywords
for SMD device coding via Google,
are there any other suggestions for more synonyms that appear in datasheets?

My sloppy typing , the WU1 is in fact 3 land

Michael A. Terrell wrote in message
m...

N_Cook wrote:

I thought I'd messed up the USB lead of my HP 1020 laserjet , measuring
voltages etc, trying to learn about USB function. Turned out I must have
strained a USB A to B adaptor and nothing wrong with the printer. Is one
rule of thumb (for a suspect USB connection) that a maximum USB
insertion
force of 250 gram is too low and above 450 gram is generally good ? ( I
later went around a number of leads /connectors, adaptors with the
kitchen
scales).
Anyway inside the printer there were 6 unmarked 2 land SMD lumps marked
on
the overlay as E1 to E6 , is E a designation for fuse?, all were 0 ohms
across.


'E' is often used to indicate a connection off the board. They are
probably there for automated testing in a 'Bed of Nails' (AKA: Pogo
Pins) test fixture during the manufacturing process. More and more
manufacturing is moving to this method where boards are handled by
machines from the time the blanks are loaded into a pick & place
machine, till they are ready to be installed in a product.


There were 2 unmarked green 2 land lumps on the USB lines marked VR
on the overlay, bidirectional transient suppressors ?
and 2 SMD contacting the USB lines marked CR, presumably rectifiers, but
can
anyone identify with more certainty
4 land device marked topmark D132
found on topcode listings
D13 AZZ23C8V2 Diode SOT23 dual zener 8.2V 0.3W, 3 pin
related?

2 land device marked WU1
found
WU BZX284-B4V3 Phi I SOD110 0.4W zener 4.3V E24 ±2%, 2 pin
related ?

Generally do truncated 3 and 4 character topcodes have any relation to
the
full code ?


No. They match the component's location on the schematics and B.O.M.


--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.

The "E" were not all the same physical size, one was quite large. Did not
try a probe on the central material but matt black , ie non metalic. If they
were in fact inductors what subclass ?, there were other items marked "L"
for inductors on the same board

Franc Zabkar wrote in message
...
On Fri, 7 May 2010 11:19:24 +0100, "N_Cook" put
finger to keyboard and composed:

Anyway inside the printer there were 6 unmarked 2 land SMD lumps marked
on
the overlay as E1 to E6 , is E a designation for fuse?, all were 0 ohms
across.

There were 2 unmarked green 2 land lumps on the USB lines marked VR
on the overlay, bidirectional transient suppressors ?

USB ports have short circuit current protection. I believe some may
implement this via polyswitches, or some similar device, eg PTC
resistor (?). Are these devices in series with the supply pins?

and 2 SMD contacting the USB lines marked CR, presumably rectifiers, but
can
anyone identify with more certainty

4 land device marked topmark D132
found on topcode listings

CM1213 1, 2, 4, 6 and 8-Channel Low Capacitance ESD Protection Arrays
http://www.datasheetarchive.com/pdf-...DSA-127548.pdf

Yours would be the CM1213-02Sx 2-channel array (D132 marking code). I
suspect that it would be providing ESD protection on each of the D+
and D- pins.

2 land device marked WU1

FWIW, this forum thread ...


http://www.monitorlab.ru/forum/viewt...0466ab2db337cd
6b8d9e43e15d4

... suggests that, in a HP 1020, the WU1 part may be a ...

PESD5V2S2UT Phi A SOT23 Uni-directional ESD Protection 5.2V:
http://www.nxp.com/documents/data_sh...2UT_SERIES.pdf

However it is a 3-pin device.

Generally do truncated 3 and 4 character topcodes have any relation to
the
full code ?

In the D132 case, it appears to be true.

13 - 1213
2 - -02


- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


I wonder how we can pick up this wildcard structure as in the Philips/XNP
datasheet
http://www.nxp.com/documents/data_sh...2UT_SERIES.pdf
in a Google search


MARKING

TYPE NUMBER / MARKING CODE
PESD3V3S2UT / *U9
PESD5V2S2UT / *U1
PESD12VS2UT / *U2
PESD15VS2UT / *U3
PESD24VS2UT / *U4
Note
* = p : made in Hong Kong.
* = t : made in Malaysia.
* = W : made in China.

So my proper Googling for D132 ,in this case, should be of form

"D132" AND "datasheet" "part marking" OR "top code" OR "topcode" OR "top
mark" OR "topmark" OR "marking"

in the searchbox

On Sat, 8 May 2010 09:15:09 +0100, "N_Cook" put
finger to keyboard and composed:

So my proper Googling for D132 ,in this case, should be of form

"D132" AND "datasheet" "part marking" OR "top code" OR "topcode" OR "top
mark" OR "topmark" OR "marking"

in the searchbox

IMHO, adding "filetypedf" in place of "datasheet" would be better:

Try this:
http://www.google.com/search?q=diode...filetype%3Apdf

BTW, I have no answer to your question regarding wildcards. It appears
that Google parses the asterisk instead of searching for it.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Franc Zabkar wrote in message
...
On Sat, 8 May 2010 09:15:09 +0100, "N_Cook" put
finger to keyboard and composed:

So my proper Googling for D132 ,in this case, should be of form

"D132" AND "datasheet" "part marking" OR "top code" OR "topcode" OR "top
mark" OR "topmark" OR "marking"

in the searchbox

IMHO, adding "filetypedf" in place of "datasheet" would be better:

Try this:
http://www.google.com/search?q=diode...filetype%3Apdf

BTW, I have no answer to your question regarding wildcards. It appears
that Google parses the asterisk instead of searching for it.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


I've previously tried and failed, to find a searchengine that does not
discard punctuation characters

Limiting to pdf search would fail to pick up usenet type side references