On 4/9/19 9:23 PM, Ali via cctalk wrote:
And you would be $10 richer now :D
I just replaced the caps on the HV board ($5 worth of parts $7.99 for S
:facepalm:) and it fired right up and started printing. None of the caps
looked "bad". I don't have an ESR meter but when I tested the caps w/
>
> It sounds like the caps have not (yet) completely failed.
>
> I'd bet $10 on the HV supply being your problem.
And you would be $10 richer now :D
I just replaced the caps on the HV board ($5 worth of parts $7.99 for S
:facepalm:) and it fired right up and started printing. None of the
>If I were you, I'd buy a complete DC/hv assembly, it must be cheap on ebay
Where is the fun in that? :) To be honest I checked and it is about $50. Parts
from mouser (w/ upgrades to 105c caps) are about $5 plus S I will try
recapping and if that fails then I will consider buying a whole HV
If I were you, I'd buy a complete DC/hv assembly, it must be cheap on ebay
---8<---Corte aqui---8<---
http://www.tabajara-labs.blogspot.com
http://www.tabalabs.com.br
---8<---Corte aqui---8<---
Em qui, 4 de abr de 2019 às 12:39, Ali via cctalk
escreveu:
>
> > You might want to order a few HV
> You might want to order a few HV diodes because a leaky HV diode
> could be found if the caps are good.
>
Thanks. I will keep that in mind.
-Ali
On 4/3/2019 9:44 AM, Jon Elson via cctalk wrote:
First, since you have not checked with another cartridge, is to examine
the corona wires and/or "combs" on the cart. Sometimes the wires break
at one end. Also, toner spills could short it out, I've had that
before. Bent contacts on the cart
On 04/03/2019 03:24 AM, Ali via cctalk wrote:
Is the fuser roller warming up properly? Or, is it the
corona supply is having trouble coming up to voltage? You
should pull the bottom of the printer apart and thoroughly
clean the PC board on both sides. If you have never done
this, it will be a
On 04/03/2019 03:24 AM, Ali via cctalk wrote:
Thanks for that tidbit. I didn't realize that a HV failure
would not produce any error codes. If that is the case
looks like I am recapping a board. Out of curiosity what
symptoms were you getting?
Nope, I think there is some sort of self-check
> It sounds like the caps have not (yet) completely failed.
>
> I'd bet $10 on the HV supply being your problem.
Grant,
I think that would be a good bet. I am going to order parts and recap the
board... See where that gets us. Thanks for all of your help.
-Ali
> Just my little bit of input on this...the high voltage power supply is
> just about the only thing that there is no error code for. I had one
> fail and the printer didn't flag any errors. Changing the HV supply
> fixed it.
>
> It sounds to me like your problem is related to the high voltage
> Is the fuser roller warming up properly? Or, is it the
> corona supply is having trouble coming up to voltage? You
> should pull the bottom of the printer apart and thoroughly
> clean the PC board on both sides. If you have never done
> this, it will be a HUGE BLACK MESS with spilled toner
On 04/02/2019 02:56 PM, Ali via cctalk wrote:
I rescued a LaserJet 4+ printer that I have been trying to restore.
Initially everything seemed ok and it seemed as if there may be just a bit
of an issue with paper pickup which I attributed to old paper in the tray.
However, soon I started getting
On 4/2/19 4:20 PM, Ali via cctalk wrote:
So I took out the HV board and it was super
dirty (I added pictures on the thread in VCF at
www.vcfed.org/forum/showthread.php?69109-Help-with-LJ-4-Printer-Repair-Please=564565
).
I saw.
Nothing that should really prevent electrical flow but I
On 4/2/19 2:47 PM, Ali via cctalk wrote:
Yes, these guys were built like tanks. This one acts as a 4M now because
I added the PS module to it and it has local talk support. No duplexer
or extra paper tray though :(.
It was really a 4+. I picked it up for $1 ~ $10 at a ham fest. I then
On 4/2/19 4:57 PM, Guy Dunphy via cctalk wrote:
One other tip that might be useful. Very commonly with old photocopiers
and laser printers the rubber pick-up and paper feed rollers lose their
'tack' and slip on the paper. I found that briefly soaking them in
teatree oil restores the 'tack'
You could well have a temp sensitive HV supply or excess moisture in it that
keeps the HT low until the warmth of operation dries it out. Given the problem
returns each time, a temp sensitive HV sounds likely.
Not sure how quickly you could remove and replace the supply but you might
trying
Ali via cctalk wrote on 4/2/2019 3:56 PM:
I rescued a LaserJet 4+ printer that I have been trying to restore.
Initially everything seemed ok and it seemed as if there may be just a bit
of an issue with paper pickup which I attributed to old paper in the tray.
However, soon I started getting the
Hello Guy,
> Or the drum isn't getting charged in the first place, before light
> exposure then toner dusting.
> A way to check this: while the machine is in mid-copy, cut the power
> then open it up and look at the drum.
> Is there a toner image adhered to the drum section between where the
>
> Since you are presumably going to keep this printer, once you fix it,
> or
> at least use it for large jobs where wasting the first few pages isn't
> a
> big issue, I would suggest getting another cartridge.
> You will need it, eventually.
> And, it provides a simple test to support or reject
Or the drum isn't getting charged in the first place, before light exposure
then toner dusting.
A way to check this: while the machine is in mid-copy, cut the power then open
it up and look at the drum.
Is there a toner image adhered to the drum section between where the surface is
>
> """
> - Bad / dirty contacts to the hi voltage
> - Bad high voltage
> - Bad DC power supply.
> """
Grant,
So I took out the HV board and it was super dirty (I added pictures on the
thread in VCF at
www.vcfed.org/forum/showthread.php?69109-Help-with-LJ-4-Printer-Repair-Please=564565
>If I'm not mistaken, high voltage capacitors on power supply. The corona wire
>isn't >charging the paper, so the image doesn't get transferred from the
>cylinder to the paper to >be pressed/fused in the fusor.
Alexander,
Thanks for the reply. Grant also suggested the same thing. I am turning
Grant,
> I miss my 4M+ with duplexer and extra paper tray. :-(
Yes, these guys were built like tanks. This one acts as a 4M now because I
added the PS module to it and it has local talk support. No duplexer or extra
paper tray though :(.
> I've found that the age of the paper isn't as
On 4/2/19 2:09 PM, Grant Taylor via cctalk wrote:
I'll share your email with a friend who was a certified HP LaserJet
repairman. (I just pretended to be one a couple of jobs ago).
My friend replied with the following:
"""
- Bad / dirty contacts to the hi voltage
- Bad high voltage
- Bad
On 4/2/19 1:56 PM, Ali via cctalk wrote:
I rescued a LaserJet 4+ printer that I have been trying to restore.
I miss my 4M+ with duplexer and extra paper tray. :-(
Initially everything seemed ok and it seemed as if there may be just a bit
of an issue with paper pickup which I attributed to
If I'm not mistaken, high voltage capacitors on power supply. The corona
wire isn't charging the paper, so the image doesn't get transfered from the
cylinder to the paper to be pressed/fused in the fusor.
---8<---Corte aqui---8<---
http://www.tabajara-labs.blogspot.com
http://www.tabalabs.com.br
I rescued a LaserJet 4+ printer that I have been trying to restore.
Initially everything seemed ok and it seemed as if there may be just a bit
of an issue with paper pickup which I attributed to old paper in the tray.
However, soon I started getting the accordion paper jam which led me to
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