Homebrew_PCBs

Hi,

tried the m412 for the first time today.
After printing the layout (at darkest setting) i was convinced the printer
is useless for TT because it was not opaque on paper against a light
source.

However, i was surprised to see the final result be flawless, only the
board outline didn't transfer fully but i'll figure that out somehow. The
only drawback is that the 1200dpi is a "fake" photo mode, i'd probably
have gone for a "true 1200" HP if i had known that. I fear i'll only get
600x600 real-life dpi but i sure hope it'll last me a few years.
The low amount of toner solves many problems with spreading and stuff, so
the gain in resolution is better than the pure DPI gain anyway.


Anyhow, the M412/412 from lexmark is definitely on the "this one works"
list (will list in database after next board). Also, don't get discouraged
if the printout doesn't seem fully opaque, it needn't mean it won't work.

ST

Thanks for that news Stefan. Anybody using a Lexmark X215 and can report
results? I have not long installed one here, now that I have retired. I
expect that it will work well, as I expect that any of the contemporary
Lexmark lasers will most likely share common technology.

By the way, I visited Lexmark's headquarters in Lexington, Kentucky back in
July and have very good contacts with Lexmark here in Australia. I suspect
that I should be able to source any technical advice we might require.

Cheers

Bill
-----Original Message-----
From: Stefan Trethan <stefan_trethan@...>
To: homebrew_pcbs@yahoogroups.com <homebrew_pcbs@yahoogroups.com>
Date: Wednesday, 2 March 2005 4:05
Subject: [Homebrew_PCBs] lexmark m412 board results

>
>Hi,
>
>tried the m412 for the first time today.
>After printing the layout (at darkest setting) i was convinced the printer
>is useless for TT because it was not opaque on paper against a light
>source.
>
>However, i was surprised to see the final result be flawless, only the
>board outline didn't transfer fully but i'll figure that out somehow. The
>only drawback is that the 1200dpi is a "fake" photo mode, i'd probably
>have gone for a "true 1200" HP if i had known that. I fear i'll only get
>600x600 real-life dpi but i sure hope it'll last me a few years.
>The low amount of toner solves many problems with spreading and stuff, so
>the gain in resolution is better than the pure DPI gain anyway.
>
>
>Anyhow, the M412/412 from lexmark is definitely on the "this one works"
>list (will list in database after next board). Also, don't get discouraged
>if the printout doesn't seem fully opaque, it needn't mean it won't work.
>
>ST
>
>
>
>Be sure to visit the group home and check for new Bookmarks and files:
>http://groups.yahoo.com/group/Homebrew_PCBs
>Yahoo! Groups Links
>
>
>
>
>
>
>

On Wed, 2 Mar 2005 10:47:27 +1100, William Raymond Maxwell
<wrmaxwell@...> wrote:

> I
> expect that it will work well, as I expect that any of the contemporary
> Lexmark lasers will most likely share common technology.
> By the way, I visited Lexmark's headquarters in Lexington, Kentucky back
> in
> July and have very good contacts with Lexmark here in Australia. I
> suspect
> that I should be able to source any technical advice we might require.
> Cheers
> Bill

I expect too. What i wonder is if "fuser oil" is beeing a problem with
some printers.
The felt "wiper" on the upper fuser roller is applying fuser oil in some
models (silicone oil).

I guess that would thwart any attemt to transfer the toner.

With new HP toner came a wiper once that seemed to contain the oil, so i
haven't changed it. The wiper in the Lexmark was new and seemed dry.
Fuser oil is one of the things i still wonder about.


By the way, while at printers, the quartz lamp in a fuser seems to be the
same as the "halogene lamp" in floodlights, true? would that be a cheap
replacement? Just wondering, 'cause they seem overly expensive at printer
spare parts shops...

ST

>
> By the way, while at printers, the quartz lamp in a fuser seems
> to be the
> same as the "halogene lamp" in floodlights, true? would that be a cheap
> replacement? Just wondering, 'cause they seem overly expensive at
> printer
> spare parts shops...
>
> ST
>

Same thing, althought you might have trouble matching power rating & sizes.
The fuser section from a photocopier I have here to make a laminator out of
has a 850 watt lamp in it. Old HP LaserJets are about 500 watt.

If you find one that is the right length & has the correct connectors, it
should work. The lamp for those work lamps will probably be ok, although
they don't seem to have a very long life. I can only recall one time I
replaced a printer lamp, and that was thru someone breaking it, not it
wearing out. Might explain the cost! Quality!

The 850 watt one I mention here has the wires permanently attached, and is
about 300mm long, to handle A3 paper. The HP one would be about 200mm long.

Tony

On Thu, 3 Mar 2005 05:21:17 +1100, Tony Smith <ajsmith@...>
wrote:

>
> Same thing, althought you might have trouble matching power rating &
> sizes.
> The fuser section from a photocopier I have here to make a laminator out
> of
> has a 850 watt lamp in it. Old HP LaserJets are about 500 watt.
> If you find one that is the right length & has the correct connectors, it
> should work. The lamp for those work lamps will probably be ok, although
> they don't seem to have a very long life. I can only recall one time I
> replaced a printer lamp, and that was thru someone breaking it, not it
> wearing out. Might explain the cost! Quality!
> The 850 watt one I mention here has the wires permanently attached, and
> is
> about 300mm long, to handle A3 paper. The HP one would be about 200mm
> long.
> Tony
>

The lexmark printer has the same ceramic ends with brass contacts where a
spring contact presses against, no wires, exactly the same as in the
lamps. the power's another issue...

ST

I just bought an ESR kit that measures a capacitor's Equivalent Series
Resistance. That has nothing to do with this forum, however the manual
that came with this kit was printed on glossy paper and the toner is "B
L A C K" and shines. There are no visible pinholes nor is there any
tangible height to the toner. There is none of the edge fuzz that's
associated with ink jets and the pattern for grey areas is a set of
black dots in a one to one size-wise relationship with the white
background. What type of printer does this because it looks like a good
candidate for toner transfer printing.
Terry M

> -----Original Message-----
> From: Stefan Trethan [mailto:stefan_trethan@...]
> Sent: Thursday, 3 March 2005 5:45 AM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: Re: [Homebrew_PCBs] Lamps, was lexmark m412 board results
>
>
>
> On Thu, 3 Mar 2005 05:21:17 +1100, Tony Smith <ajsmith@...>
> wrote:
>
> >
> > Same thing, althought you might have trouble matching power rating &
> > sizes.
> > The fuser section from a photocopier I have here to make a
> laminator out
> > of
> > has a 850 watt lamp in it. Old HP LaserJets are about 500 watt.
> > If you find one that is the right length & has the correct
> connectors, it
> > should work. The lamp for those work lamps will probably be
> ok, although
> > they don't seem to have a very long life. I can only recall one time I
> > replaced a printer lamp, and that was thru someone breaking it, not it
> > wearing out. Might explain the cost! Quality!
> > The 850 watt one I mention here has the wires permanently
> attached, and
> > is
> > about 300mm long, to handle A3 paper. The HP one would be about 200mm
> > long.
> > Tony
> >
>
>
> The lexmark printer has the same ceramic ends with brass contacts
> where a
> spring contact presses against, no wires, exactly the same as in the
> lamps. the power's another issue...
>
> ST

HP lamps are like that too, from what I remember. The one with the wire
attached was from a Canon photocopier. I think they did this to reduce
manufacturing costs, it had a lot of 'let's do it as cheap as possible
features' in it. Not one of their better efforts.

In theory, you could replace the lamp with strands of nichrome wire. The
fact that everyone uses halogen lamps probably means it's more hassle than
it's worth. (The wire would burn out, stretch, insulation problems, etc)

Tony

On Wed, 2 Mar 2005 11:27:51 -0800, Terry Mickelson <tmdslca@...>
wrote:

> I just bought an ESR kit that measures a capacitor's Equivalent Series
> Resistance. That has nothing to do with this forum, however the manual
> that came with this kit was printed on glossy paper and the toner is "B
> L A C K" and shines. There are no visible pinholes nor is there any
> tangible height to the toner. There is none of the edge fuzz that's
> associated with ink jets and the pattern for grey areas is a set of
> black dots in a one to one size-wise relationship with the white
> background. What type of printer does this because it looks like a good
> candidate for toner transfer printing.
> Terry M

Ask the supplier?

ST

Terry Mickelson wrote:

> I just bought an ESR kit that measures a capacitor's Equivalent Series
> Resistance. That has nothing to do with this forum, however the manual
> that came with this kit was printed on glossy paper and the toner is "B
> L A C K" and shines. There are no visible pinholes nor is there any
> tangible height to the toner.

Have you considered it might have been printed on a normal lithographic
printing press?

Terry Mickelson wrote:

> I just bought an ESR kit that measures a capacitor's Equivalent

Series Resistance.

[snip]

> Terry M

Hi:
From whom did you buy the abovementioned kit ? ?

Thx

On Thu, 03 Mar 2005 16:04:42 -0000, bill_at_pearl
<custserv@...> wrote:

>
>
>
> Terry Mickelson wrote:
>> I just bought an ESR kit that measures a capacitor's Equivalent
> Series Resistance.
>
> [snip]
>
>> Terry M
>
> Hi:
> From whom did you buy the abovementioned kit ? ?
>
> Thx
>

Not a kit, but a schematic for a very easy to build one:

<http://www.albany.net/~gwoods/esr_meter/esr_meter_index.html>

I've made it and it works really great. Has singlehandedly repaired
several appliances already.

Planning to offer a pcb for it for ages, still haven't had time to rework
it.

ESR meter is a must have i think...


ST

Am I missing something here, does it measure it resistance when in
circuit and running?

Do you the plug/connect the cap into the box and it 'performs a test' on
it and tells you its resistance? if so do you need to remove one side of
it from the circuit its in?

On Thu, 03 Mar 2005 16:53:28 +0000, Lez <lez.briddon@...> wrote:

>
> Am I missing something here, does it measure it resistance when in
> circuit and running?
> Do you the plug/connect the cap into the box and it 'performs a test' on
> it and tells you its resistance? if so do you need to remove one side of
> it from the circuit its in?

in circuit, you don't need to desolder anything.

You should power off the unit, because AC signals on the cap can influence
the result, but you don't need to discharge the cap, the DC does no harm.

Of course if there are low resistance parts parallel you measure them too,
but so far that never happened to me.
(the only situation to desolder i can imagine is when you want to find a
faulty cap in a series of several parallel ones.)

The meter works by applying a small AC voltage of 50kHz across the cap and
measuring the resistance for this AC current. The voltage is small enough
not to trigger diodes.
I use the meter to check all caps in a faulty circuit, which takes maybe
one minute and you needn't replace old electrolytics "upon sight" as many
suggest. You can also use old stock with less risk if you test them before.


What i found most amazing is that the meter i linked to uses 3V single
supply voltage with a LM324 and actually works. (I use 2 nicad cells)

ST

I bought the Australian designed kit for the "Dick Smith ESR meter"
locally from a distributer close to me for $80 Canadian.
The meter measures low ohms from .01 to 99 on a two digit display using
AC (actually it's pulses) instead of DC. It will measure capacitors in
circuit or out but they must be discharged first.
I've found that my standard (used) electrolytic caps are usually good
but some of the (used) Tantalums were highly variable and in one small
batch, three of them got thrown out. The meter measures caps from 1 uF
up to 10,000 uF. It doesn't measure accurately below 1uF. Caps below
1uF aren't usually electrolytics in any case.
The meter will also measure resistors from .01 to 99 ohms. My regular
ohmmeter doesn't do well below an ohm. As for the power supply, they
supply two battery holders for 6 triple A's. I went with a plug in AC
brick that supplies the 9 VDC. It's a switcher type that I found in a
thrift store for 25 cents.
The kit has been well thought out and is easy to assemble but I had to
measure the resistors first before installation because their color
codes on a blue background are hard to read. After assembly, there was
no need to calibrate as the readings were accurate as is.
Terry M

On Thu, 3 Mar 2005 10:50:01 -0800, Terry Mickelson <tmdslca@...>
wrote:

> I bought the Australian designed kit for the "Dick Smith ESR meter"
> locally from a distributer close to me for $80 Canadian.

I considered that one before i built mine, it is pretty nice, but was too
expensive as i had all the parts for the other meter at hand.
I have a milliohm meter already, so i don't miss that (and it would be
useless for motor-resistance anyway because of the ac signal, which is
what i need milliohm measured most often).
ESR is only "good" or "bad", so i find the analog meter has plenty of
resolution and allows quick reading.

I guess both do a similar job.

ST