[comp.laser-printers] Memory upgrade for original HPLJ?

PNU@PSUVM.PSU.EDU (12/04/89)

I apologize if this question keeps cropping up in this group, but this
is the first time I've had to deal with the problem:

We have a bunch of HP laser printers, mostly LJ II's and +'s. We also have
one of the original LaserJets with no expansion slot for added memory. I
would like to know if there is any way (factory authorized or not) to increase
the memory of this older machine to make it capable of handling high-res plots
and more downloaded fonts.

I am not adverse to using third party hardware or physically modifying the
existing memory circuitry.

Any advice that anyone can give me would be greatly appreciated!

(Purchasing a new LJ II or substituting one of our other printers for the
older one is, unfortunately, not an option: it is part of a classified
computer system and substitution would generate a lot of administrative
headaches).


                    Jon Peters
                    Research Assistant
                    Pennsylvania State University Applied Research Laboratory

                    (814) 865 4229

                    Bitnet: PNU@PSUVM

vera@cadence.UUCP (Vera VallentinPrice) (12/29/89)

>	We have a bunch of HP laser printers, mostly LJ II's and +'s. We also have
>	one of the original LaserJets with no expansion slot for added memory. I
>	would like to know if there is any way (factory authorized or not) to increase
>	the memory of this older machine to make it capable of handling high-res plots
>	and more downloaded fonts.
>	I am not adverse to using third party hardware or physically modifying the
>	existing memory circuitry.

>                    Jon Peters

I would like the same information including information on hardware modification.

I have used my Laserjet Plus for over three years now with no problems whatsoever
except for the memory limitations of 512K. I used also Laserjets II, but I like 
the output from my model slightly better. It seems somewhat darker and richer.
These are good reasons for anyone to keep their older Laserjets. 

I also had a lot more trouble refilling the cartridges for the II's. I could 
refill the LJ Plus cartridge up to 7 or 8 times. The LJ II ones poop out after
the second time or cannot be refilled at all. I believe, HP overengineered the 
LJ Plus engine which they stopped doing on the LJ II. The printing drum also 
has a larger diameter which means the drum rotates fewer times to print a page 
(which means probably less wear?).

Anyway, I really would like to keep this model, but I need more memory for it.
HP's own upgrade path is too expensive for me. If anyone out there has successfully
modified their LJ Plus, please let me know. 

I'd appreciate any pointers!
Thanks,
Vera.

Vera Vallentin-Price	Cadence Design Systems, Inc.	408-954-7605
			555 River Oaks Parkway
			San Jose, CA 95134