CMOS in HP Laserjet IIIIP ?

[Don Phillipson]

How does a Laserjet IIIP maintain its (DOS)
menu selections -- a CMOS battery? Ours
periodically seems to lose its settings (i.e.
under Win98SE will not print and signals
"Load Paper in MP" although the paper tray
is full.) Is there a battery hidden somewhere
that we should replace?

 

[Davy]

Here's a list of error codes that 'may' be useful to you

http://www.srconline.com/resource1.html what you say seems to suggest
a memory back up battery fault.

Davy

 

[zakezuke]

Here's a list of error codes that 'may' be useful to you

http://www.srconline.com/resource1.html what you say seems to suggest
a memory back up battery fault.

Does the HP III employ the use of a backup battery? Everything I see
sugests NVram, which technicaly is a battery which powers ram, but all
in one package... unless someone feels comfortable using an x-acto to
cut away the epoxy on their chip and snipping the wires. They are easy
enough to spot, they are double or tripple the height of regular chips
and are almost always socketed.

 

[William R. Walsh]

Hi!

Does the HP III employ the use of a backup battery? Everything I see
sugests NVram, which technicaly is a battery which powers ram, but all
in one package...

No, that's a "Dallas module" for want of a better term. There exist a large
number of NVRAM implementations that use an external battery. In a printer
such as this I wouldn't be surprised if you'd find a 3.6 lithium battery or
a button cell.

I've had some HP printers apart that had a backup battery in place. So far
the battery of choice has been a CR2032 button cell in a socket.

William

 

[Tony]

How does a Laserjet IIIP maintain its (DOS)
menu selections -- a CMOS battery? Ours
periodically seems to lose its settings (i.e.
under Win98SE will not print and signals
"Load Paper in MP" although the paper tray
is full.) Is there a battery hidden somewhere
that we should replace?

Don
I do not know whether there is a battery or not.
But a couple of questions.
Do you have an extra tray installed?
Do you get either an "error 41" or blank pages printed when the problem happens?
The trays have small protrusions that tell the printer what sort of tray it is
(paper size), these can become damaged and make intermittent contact with the
sensor switches, these switches can also become damaged.
Tony