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LaserJet III - Service 50 Error - Can't Solve

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  • Printers
  • Controller
  • Laserjet
  • Peripherals
Last response: in Computer Peripherals
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Anonymous
April 3, 2004 5:30:30 PM

Archived from groups: comp.periphs.printers (More info?)

I'm doing long distance trouble shooting for a friend who has the infamous
"50 Service" error.

Thus far he has (in order):
1) Replaced fuser with new (Thermal switch was bad).
2) Replaced AC supply with referbished
3) Checked DC voltages (+24, +5, -5). All good.
4) Replaced DC Controller with referbished.
5) Continuity checked cables between the DC controller and fuser and AC
supply. Good.

I installed his old DC controller into my LJIII and it works.
Fuser does come on briefly during power-up.

All this and still no-go. Any ideas? Maybe the AC supply is still bad?

David

More about : laserjet iii service error solve

Anonymous
April 4, 2004 4:39:21 AM

Archived from groups: comp.periphs.printers (More info?)

David
>LaserJet III - Service 50 Error - Can't Solve

All this and still no-go. Any ideas? Maybe the AC supply is still bad?

The pins on the left end of the fuser can be inserted off by one pin. Otherwise
it is good to have a second working printer to test components by elimination.
And of course reseating/insuring the connection of any connectors is a must.
Bob AZ
Anonymous
April 4, 2004 6:04:48 AM

Archived from groups: comp.periphs.printers (More info?)

"dh" <djharrid@bellsouth.net> wrote in message
news:2fEbc.5436$tT3.2356@bignews6.bellsouth.net...
> I'm doing long distance trouble shooting for a friend who has the infamous
> "50 Service" error.
>
> Thus far he has (in order):
> 1) Replaced fuser with new (Thermal switch was bad).
> 2) Replaced AC supply with referbished
> 3) Checked DC voltages (+24, +5, -5). All good.
> 4) Replaced DC Controller with referbished.
> 5) Continuity checked cables between the DC controller and fuser and AC
> supply. Good.
>
> I installed his old DC controller into my LJIII and it works.
> Fuser does come on briefly during power-up.
>
> All this and still no-go. Any ideas? Maybe the AC supply is still bad?
>
> David

David,

I suggest post here:

http://forums1.itrc.hp.com/service/forums/categoryhome....

Just say: Please Dewaine, Jay said you might be able to help me...

-- Jay
Related resources
Anonymous
April 4, 2004 4:04:21 PM

Archived from groups: comp.periphs.printers (More info?)

Sounds like a defective, burned out fuser unit. Check eBay for deals.

Bill Crocker


"dh" <djharrid@bellsouth.net> wrote in message
news:2fEbc.5436$tT3.2356@bignews6.bellsouth.net...
> I'm doing long distance trouble shooting for a friend who has the infamous
> "50 Service" error.
>
> Thus far he has (in order):
> 1) Replaced fuser with new (Thermal switch was bad).
> 2) Replaced AC supply with referbished
> 3) Checked DC voltages (+24, +5, -5). All good.
> 4) Replaced DC Controller with referbished.
> 5) Continuity checked cables between the DC controller and fuser and AC
> supply. Good.
>
> I installed his old DC controller into my LJIII and it works.
> Fuser does come on briefly during power-up.
>
> All this and still no-go. Any ideas? Maybe the AC supply is still bad?
>
> David
>
>
>
>
>
>
Anonymous
April 4, 2004 5:01:26 PM

Archived from groups: comp.periphs.printers (More info?)

A new unit (not referbished) was installed, but of course it could be bad.
The thermistor resistance is correct and the thermal switch is closed as it
should be.


> Sounds like a defective, burned out fuser unit. Check eBay for deals.
>
> Bill Crocker
>
Anonymous
April 4, 2004 7:50:29 PM

Archived from groups: comp.periphs.printers (More info?)

My friend checked the resistance of the thermistor
on the "new" fuser. Reads shorted. Go figure.

I think too many measurements were made over the past
two weeks and this one was missed. His old fuser has a
bad thermal switch, but the thermistor reads good. Perhaps
it can be swapped.
Anonymous
April 4, 2004 7:50:30 PM

Archived from groups: comp.periphs.printers (More info?)

dh wrote:
> My friend checked the resistance of the thermistor
> on the "new" fuser. Reads shorted. Go figure.
>
> I think too many measurements were made over the past
> two weeks and this one was missed. His old fuser has a
> bad thermal switch, but the thermistor reads good. Perhaps
> it can be swapped.
>
>

You can get caught in a loop where:
1) you put in a new AC power unit
2) a bad fuser zaps an AC power supply

and you can kind of repeat it especially if you swap fusers around.

So I finally learned not to put in a new AC power unit until somehow I
had proven that the fuser was OK.

Most of the time, I actually remember to do this.

Jim
--
................................


Keepsake gift for young girls.
Unique and personal one-of-a-kind.
Builds strong minds 12 ways.
Guaranteed satisfaction
- courteous money back
- keep bonus gifts

http://www.alicebook.com
Anonymous
April 5, 2004 12:30:05 AM

Archived from groups: comp.periphs.printers (More info?)

Be sure you have the pins on the AC Power supply lined up.
"Fuser does come on briefly during power-up", more often than not, this is caused
by a bad AC Power Supply.

On Sun, 04 Apr 2004 01:04:48 GMT, "Jay Bollyn" <jbollyn@neiu.edu> wrote:

>"dh" <djharrid@bellsouth.net> wrote in message
>news:2fEbc.5436$tT3.2356@bignews6.bellsouth.net...
>> I'm doing long distance trouble shooting for a friend who has the infamous
>> "50 Service" error.
>>
>> Thus far he has (in order):
>> 1) Replaced fuser with new (Thermal switch was bad).
>> 2) Replaced AC supply with referbished
>> 3) Checked DC voltages (+24, +5, -5). All good.
>> 4) Replaced DC Controller with referbished.
>> 5) Continuity checked cables between the DC controller and fuser and AC
>> supply. Good.
>>
>> I installed his old DC controller into my LJIII and it works.
>> Fuser does come on briefly during power-up.
>>
>> All this and still no-go. Any ideas? Maybe the AC supply is still bad?
>>
>> David
>
>David,
>
>I suggest post here:
>
>http://forums1.itrc.hp.com/service/forums/categoryhome....
>
>Just say: Please Dewaine, Jay said you might be able to help me...
>
>-- Jay
>
April 6, 2004 12:29:36 AM

Archived from groups: comp.periphs.printers (More info?)

On Sat, 3 Apr 2004 13:30:30 -0600, "dh" <djharrid@bellsouth.net>
wrote:

>I'm doing long distance trouble shooting for a friend who has the infamous
>"50 Service" error.
>
>Thus far he has (in order):
>1) Replaced fuser with new (Thermal switch was bad).
>2) Replaced AC supply with referbished
>3) Checked DC voltages (+24, +5, -5). All good.
>4) Replaced DC Controller with referbished.
>5) Continuity checked cables between the DC controller and fuser and AC
>supply. Good.
>
>I installed his old DC controller into my LJIII and it works.
>Fuser does come on briefly during power-up.
>
>All this and still no-go. Any ideas? Maybe the AC supply is still bad?
>
>David
>
>
>
>
>
Have you checked the upper cooling fan? The one sitting on top of the
AC Power Supply? A lot of times that is the culprit. If it's frozen
up or burned out, you will get the 50 service error message.

Frank
Anonymous
April 6, 2004 9:27:44 PM

Archived from groups: comp.periphs.printers (More info?)

The original fan was frozen up, but was replaced with a new one.

<magpie@shinythings.com> wrote in message
news:u8g3705h46ihon1lguip0vq6457uj1s3oe@4ax.com...
> On Sat, 3 Apr 2004 13:30:30 -0600, "dh" <djharrid@bellsouth.net>
> wrote:
>
> >I'm doing long distance trouble shooting for a friend who has the
infamous
> >"50 Service" error.
> >
> >Thus far he has (in order):
> >1) Replaced fuser with new (Thermal switch was bad).
> >2) Replaced AC supply with referbished
> >3) Checked DC voltages (+24, +5, -5). All good.
> >4) Replaced DC Controller with referbished.
> >5) Continuity checked cables between the DC controller and fuser and AC
> >supply. Good.
> >
> >I installed his old DC controller into my LJIII and it works.
> >Fuser does come on briefly during power-up.
> >
> >All this and still no-go. Any ideas? Maybe the AC supply is still bad?
> >
> >David
> >
> >
> >
> >
> >
> Have you checked the upper cooling fan? The one sitting on top of the
> AC Power Supply? A lot of times that is the culprit. If it's frozen
> up or burned out, you will get the 50 service error message.
>
> Frank
>
Anonymous
April 6, 2004 9:35:16 PM

Archived from groups: comp.periphs.printers (More info?)

My LJIII printer was sick during this troubleshooting of my friend's printer
so between the two of us we've learned a lot and can take a LJIII apart
while blindfolded. I bought a service manual in pdf format on-line. Wish I
had the manual before all this started. For my printer I replaced the AC
supply and fuser before finding it was the DC controller. Spent more than
the printer is worth, but once I started I just HAD to fix it.

"jbuch" <jbuch@CUTHERErevealed.net> wrote in message
news:c4q6tg0ils@enews1.newsguy.com...
> dh wrote:
> > My friend checked the resistance of the thermistor
> > on the "new" fuser. Reads shorted. Go figure.
> >
> > I think too many measurements were made over the past
> > two weeks and this one was missed. His old fuser has a
> > bad thermal switch, but the thermistor reads good. Perhaps
> > it can be swapped.
> >
> >
>
> You can get caught in a loop where:
> 1) you put in a new AC power unit
> 2) a bad fuser zaps an AC power supply
>
> and you can kind of repeat it especially if you swap fusers around.
>
> So I finally learned not to put in a new AC power unit until somehow I
> had proven that the fuser was OK.
>
> Most of the time, I actually remember to do this.
>
> Jim
> --
> ...............................
>
>
> Keepsake gift for young girls.
> Unique and personal one-of-a-kind.
> Builds strong minds 12 ways.
> Guaranteed satisfaction
> - courteous money back
> - keep bonus gifts
>
> http://www.alicebook.com
>
!