Digest for sci.electronics.repair@googlegroups.com - 17 updates in 8 topics

"David Farber" <farberbear.unspam@aol.com>: Apr 10 08:22AM -0700

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:0fancdpdif7lhf00cmf2qe6tmq624kq0hj@4ax.com...
"David Farber" <farberbear.unspam@aol.com>: Apr 10 08:54AM -0700

Jeff Liebermann wrote:
> <https://www.ebay.com/itm/282891878887>
 
> I some HP 4000/4050 parts in stock if you don't mind ancient
> inventory. Email for details.
 
Hi Jeff,
 
You said:
My guess is that you dumped some toner on
> the page from the toner cartridge.
 
I don't know how to interpret your guess. :-)
 
Here are pictures of the left side of the rollers in the fuser assembly:
http://webpages.charter.net/mrfixiter/Repair/HP-fuser-roller-1.jpg
http://webpages.charter.net/mrfixiter/Repair/HP-fuser-roller-2.jpg
 
I didn't see anything that was caked on but you can definitely see that the
there are some inconsistencies in the color.of roller-1. Roller-2 looked
rather normal except there seemed to be some waviness in the way it
reflected light as I was looking at with a magnifying glass.
 
I decided to swap out the fuser with another LJ4000. I also created a
"printer cleaning page" via the control panel and so far it's printing
better.
 
Thanks for your reply.
--
David Farber
Los Osos, CA
"David Farber" <farberbear.unspam@aol.com>: Apr 10 09:23AM -0700

> the repeated image. Each roller that can affect the image is a
> different size for this reason. Clean the relevant roller.
 
> NT
 
There were times that parts of the image were reprinted (think old TV with
rabbit ears receiving a secondary bounced signal) at a specific interval.
 
I used the repetitive defects ruler in the manual which is also shown here:
http://www.printertechs.com/printer-troubleshooting/repetitive-defects-rulers/138-repetitive-defects-ruler-laserjet-4000-4050
 
The spacing of the defect was 76mm which put the fuser roller as one of the
primary suspects. I decided to swap out the fuser assembly with another
machine that I had which wasn't in service and the problem seems to have
been corrected for now.
 
Thanks for your reply.
--
David Farber
Los Osos, CA
blisca <blisca@tiscali.it>: Apr 05 04:19PM +0200


>> please,i need to repair a circular PCB board inside the rotating camera
>> head of a robot,a small tractor for sewage inspection.The brand is
>> Pearpoint
 
 
 
 
Hi,
 
> Repairing that would be problematic, because it looks like it serves as
> a rotating slip ring with multiple connections.
 
Yes,exactly.A correspondig PCB mounts some spring loaded spheric
contacts(i think they are also called pogo pins),sliding on the circular
tracks.
 
> Is the original company no longer supporting this device?
no spare parts availabile,product out of production since long time,but i
admit that i still have to ask to their support about the drawings
 
> You might repair the traces but it could not be smooth, the connections
> thru the brushes or contacts would not be steady or reliable as it
> rotates. A replacement is your only real option.
I completely agree,i dont know any product that i could paint even on a
perfectly flat surface,hard enough to withstand the friction
Furthermore the burned PCB could have lost insulation.
 
I started drawing an identical PCB some days ago
The problem is to get the right distances and positions of tracks and
vias,and some of them almost disappeared ,despite their function looks
trivial(unless strange crossings).
The most precise method i found was doing an accurate photo,and using the
pixel meter of a free image editor as GIMP to get the distances.
Once drawn,i will print it on a transparent sheet to check it versus the
real one
 
Thanks for your time
 
Diego
 
---
Questa email è stata esaminata alla ricerca di virus da AVG.
http://www.avg.com
etpm@whidbey.com: Apr 10 09:16AM -0700


>---
>Questa email è stata esaminata alla ricerca di virus da AVG.
>http://www.avg.com
That's too bad. It's always nice to be able to use stock parts. Since
the housing comes apart would it be possible to have a machine shop
make up a spacer so you would have a little more room to work with? I
don't know what your robot head looks like so I really don't know what
you are working with. But since I own a machine shop I tend to see
machining answers to problems. Could you post a link to a picture of
the robot head? I'm curious about it.
Eric
N_Cook <diverse@tcp.co.uk>: Apr 10 04:20PM +0100

Printer only used monthly , perhaps when new then parking in the cart
dock at the side perhaps works, but not when years old.
A bit of a bind, but less of a bind than squirting air-duster etc to
unblock an ink cart etc etc. At the end of each session remove the
carts. Grab a couple of couple of large party balloons with the neck
cut off.
Stretch over the active face of each cart with a drop of
meths/denatured-alcahol in each balloon and store on a ledge with
balloons dangling.
ggherold@gmail.com: Apr 10 06:27AM -0700

On Tuesday, April 10, 2018 at 2:42:50 AM UTC-4, Trevor Wilson wrote:
 
> --
> Trevor Wilson
> www.rageaudio.com.au
 
It's pretty hard to get impedances above that of free space.
(377 ohms) An air gap would be better.
Jeff Liebermann <jeffl@cruzio.com>: Apr 10 08:11AM -0700

On Tue, 10 Apr 2018 16:42:43 +1000, Trevor Wilson
>an insulator with a dielectric constant of 2.56, is yo have a
>characteristic impedance of 2,000 Ohms. What must be the outer conductor
>diameter?
 
<https://www.rfcables.org/coax-calculator.html>
- Select inches.
- Plug in any number for outside dia (D) trial an error.
- Plug in 0.001 for inner diameter (d).
- Plug in 2.56 for permittivity (er) (same as dielectric constant
in this example).
- Punch "calculate"
 
I used 1,000,000 inches for outside diameter and still obtained only
776 ohms. 1,000,000,000 inches yielded 1035 ohms. I don't think it's
going to make it to 2,000 ohms unless the coax cable is absurdly huge.
 
 
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
amdx <nojunk@knology.net>: Apr 05 09:20AM -0500

>> "for businesses this is an
> Employer Identification Number." "
 
> Hmm, he could hire himself. Maybe, I would have to look into it but quite honestly I had had enough legal in my life plus I have a pro se case coming up.
Well, now you have me waiting for more info!
Mikek
Ragnusen Ultred <rragnusen@ultred.com>: Apr 06 09:29AM -0700

Am Fri, 6 Apr 2018 11:16:01 -0500, schrieb Fox's Mercantile:
 
> BWahahaha, I'm not Snit, but you're still an asshole.
 
Hehhehheh ... and yet, you *are Snit*, which you prove in every post!
Ragnusen Ultred <rragnusen@ultred.com>: Apr 05 11:55AM -0700

Am Thu, 05 Apr 2018 08:13:34 -0700, schrieb Jeff Liebermann:
 
> I can see that you've never dealt with a lawyer.
 
Jeff is right about lawyers, but wrong about the FRN, but not completely
so!
 
It's technical, with nuance, but I was on the phone with the FCC today for
almost an hour, and the end result is that you *can* get the Ham Radio
License (Technicians Class) without giving them a SSN.
 
After noting that the question is not in the FCC Ham Radio FAQ
http://wireless.fcc.gov/uls/index.htm?job=faq
 
I called the FCC today at 202-418-4120 & was bounced all over the FCC:
https://www.fcc.gov/wireless/available-support-services
 
So this is a summary, which is simpler than what actually happened.
 
Starting here (877-480-3201), you hit x4 to get the FRN department who
knows about FRN numbers but not licensing.
 
Starting here (877-480-3201), you hit x2 to get the ULS department who
knows about licensing but not about FRN numbers.
 
Bouncing back and forth between them, you end up finding out:
- You can tell the FCC that you don't have a SSN (don't ask, don't tell)
- Or, you can use the last 4 digits & get a "Restricted Use FRN"
- Or, you can use zero digits & get a "Special Use FRN" (form 323).
 
The latter two really don't apply to individuals, but they will "probably"
work. I have a few FRNs already, as the FRN guy walked me through the whole
process, where I advise you have, ahead of time, this written down:
 
1. You must give them a real email address (they send a verification note).
2. You can register for as many FRNs as you want with that email address.
3. The password is a bitch (no fewer than 12 characters, no more than 15
characters, a number, both cases, & a special character)
4. Best best is to register for a "regular" FRN & don't give them the SSN
 
Here are the steps:
A. Go to the FCC web site
https://www.fcc.gov
B. On the top blue bar, press the "Licensing & Databases" tab
https://www.fcc.gov/licensing
C. On the left side, click the "FCC Registration System (CORES)" link
https://www.fcc.gov/licensing-databases/fcc-registration-commission-registration-system
D. On the right hand side, click "Register and update Username Account"
https://apps2.fcc.gov/fccUserReg/pages/login.htm
E. On the right hand side, click to create a new account
https://apps2.fcc.gov/fccUserReg/pages/createAccount.htm
F. Check your email for the verification mail & click the verification link
G. Now go back to step C/D to "Create, update and associate FRN(s)"
https://apps.fcc.gov/cores/userLogin.do
H. When you log in, you'll end up in your "user home"
https://apps.fcc.gov/cores/userHome.do
I. Click on the "Register New FRN" link
https://apps.fcc.gov/cores/regEntityType.do?csfrToken=6dP6ZynBdGwNQz8EU22jH46gL0NnA7SVu8PoiJJPXTCFnyAhzPAxQAvfjuDVtKvo
J. It's ok to tell the truth here that you're an individual in the USA
K. When you hit the "continue" button, now you have to decide
Do you want a "restricted use FRN" (i.e., only requires 4 SSN digits) <--- this is what the FRN helpdesk suggested
Do you want a "regular use FRN" (i.e., doesn't require a SSN)
L. I did both, so I have _two_ FRNs now, but you can pick one.
M. Most people will pick a "regular" FRN so let's do that now
N. Click on "CORES FRN Registration" link & press "continue"
O. Fill out the form noticing the line that says:
If you do not have a Social Security Number, select a reason:
P. The available reasons are:
- Applied for
- Exempted Activities <----- this is what the ULS helpdesk suggested
- The individual is a petitioner
- The individual is foreign
Q. Enter in the following required information:
- First Name: (it takes an initial)
- Last Name:
- Address:
- City: (always amazes me they ask for city when they have zip)
- Zip:
- State: (always amazes me they ask for state when they have zip)
- Email: (why ask this if you're already logged in?)
R. Press "Submit" and you'll get an immediate on-screen confirmation:
"Thank you for registering with the FCC.
As of today, Apr 5 2018 9:44AM, you have been assigned the following
FCC Registration Number (FRN): 0072678193"
S. Write that number down as you don't seem to get an email confirmation.
 
Don't do what I ended up doing, which is that the FRN helpdesk told me to
create a "restricted use FRN" so I did (which still requires the last four
digits of your SSN); but the ULS helpdesk told me to create an "Exempted
Activities" FRN (which they told me is for people who don't want to give
out their SSN) - so now I have both.
 
You can't delete the FRN on the web page but you can ask the FCC to delete
it by sending an email to "coreshelpdesk@fcc.gov" and the form 323 people
don't have a phone number but you can ask questions of them via email to
"form323@fcc.gov".
 
Let me know if I left anything out that you need, but this seems to be the
process, where both the CORES and FRN people told me lots of people ask the
question (so why isn't it in the FCC FAQ?).
Erholt Rhein <erholtr@pobox.com>: Apr 05 12:45AM

None of the Ham FAQs have this privacy question.
http://wireless.fcc.gov/uls/index.htm?job=faq
 
Q: Can you get a USA Ham Radio license WITHOUT giving the gob'ment your SSN?
"~misfit~" <shaun.at.pukekohe@gmail.com>: Apr 05 01:53PM +1200

Once upon a time on usenet Ragnusen Ultred wrote:
> http://i.cubeupload.com/AXV0S1.gif
 
> Q: What is the trick to get the same functionality with the Apple Map
> App?
 
The trick is to post to the right group.
--
Shaun.
 
"Humans will have advanced a long, long way when religious belief has a cozy
little classification in the DSM*."
David Melville (in r.a.s.f1)
(*Diagnostic and Statistical Manual of Mental Disorders)
Ragnusen Ultred <rragnusen@ultred.com>: Apr 04 03:11PM +0100

Am Wed, 4 Apr 2018 07:34:55 -0500, schrieb Fox's Mercantile:
 
> This morning I woke up and still wasn't Snit.
 
And yet, everything you post proves you are Snit.
 
Remember when you posted this, for example.
<http://wetakepic.com/images/2017/10/11/wifi_sweetspots.jpg>
 
Silly games played by Fox' Mercantile when confronted with facts:
<https://youtu.be/7QaABa6DFIo>
Ralph Mowery <rmowery28146@earthlink.net>: Apr 09 05:35PM -0400

In article <MPG.3535b0393941c13a9896a1@news.plus.net>,
gravity@mjcoon.plus.com says...
> Must stick a 'scope on the wobbles to see if I can spot a pattern. The
> "ADJ" line also varied ~2V / ~3V. But clicking the power switch made no
> difference to the +0.1V on the "On/Off" line.
 
Did you see this youtube about the monitor ?
 
I think I would start out just replacing the electrolytic capacitors on
the power board.
 
Many switching supplies seem to have blown capacitors. I have repaired
several items around my house by replacing capacitors.
 
One give away for me is to take the heat gun of my hot air rework
station and playing it around one or two capacitors at a time. If the
set starts working or manking a big change I replace them.
John-Del <ohger1s@gmail.com>: Apr 09 03:16PM -0700

On Monday, April 9, 2018 at 5:07:02 PM UTC-4, Mike Coon wrote:
> "ADJ" line also varied ~2V / ~3V. But clicking the power switch made no
> difference to the +0.1V on the "On/Off" line.
 
> Mike.
 
 
 
Stuff a heat gun into the power supply and get it nice and toasty. If it powers up, recap the electros.
jurb6006@gmail.com: Apr 09 01:48PM -0700

Thought maybe you would like to see it in action :
 
http://usr.audioasylum.com/images/7/71823/561a.jpg
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