any information about LCD from old HP laser printer - Electronic Circuits Projects Diagrams Free

Joseph Papier · 26th May 2005, 12:06 PM

Hello

if ever some of you have taken parts from old equipments, maybe you can help me...

i've extracted the LCD block from an old HP laser printer that standed in the trash... it is a LCD board mounted on a small motherboard with 8 push buttons, 7 LEDs, 2 ICs (schmidt trigger inverters), a connector to the printer's main board, and a bunch of R and C.

the only things i can see are PC-PJ310 and MHE47794V-O (on the LCD board) and RH6-3146 and EDM-CPK7G00C 5420S A02 (on the other side of the LCD board). the LCD board is connected to the button board by 14 bridges.

Any idea how i could figure out what LCD it is, so that i can pilot it?

Thanx a lot in advance,

joPap

**Jay.slovak** · 26th May 2005, 01:11 PM

Quote:

Originally Posted by Joseph Papier

Hello

if ever some of you have taken parts from old equipments, maybe you can help me...

i've extracted the LCD block from an old HP laser printer that standed in the trash... it is a LCD board mounted on a small motherboard with 8 push buttons, 7 LEDs, 2 ICs (schmidt trigger inverters), a connector to the printer's main board, and a bunch of R and C.

the only things i can see are PC-PJ310 and MHE47794V-O (on the LCD board) and RH6-3146 and EDM-CPK7G00C 5420S A02 (on the other side of the LCD board). the LCD board is connected to the button board by 14 bridges.

Any idea how i could figure out what LCD it is, so that i can pilot it?

Thanx a lot in advance,

joPap

It seems like the LCD is Hitachi standard, so I would just take it out and use it separately .

Joseph Papier · 26th May 2005, 04:18 PM

thank you!
i've showed it to a friend (who must on this forum too, i guess) who told me the same thing.

i think i'll keep it on its board though, because it's quite well made:

bigger pictures here

i would like to interface it with a computer, i thought of using a PIC for the 14 lines to the LCD, the 7 LEDs, and the 8 buttons, and a RS232 serial port to the computer. does it seem ok?

thanx a lot for your quick answer!

**Jay.slovak** · 26th May 2005, 04:26 PM

Quote:

Originally Posted by Joseph Papier

thank you!
i've showed it to a friend (who must on this forum too, i guess) who told me the same thing.

i think i'll keep it on its board though, because it's quite well made:

bigger pictures here

i would like to interface it with a computer, i thought of using a PIC for the 14 lines to the LCD, the 7 LEDs, and the 8 buttons, and a RS232 serial port to the computer. does it seem ok?

thanx a lot for your quick answer!

It looks pretty well, but it is gonna be hard to figure out how to interface it... But when you do, it will look professional (I mean the final Project). Interfacing this module to PIC won't be hard, if you know how to controll it..

Exo · 26th May 2005, 06:07 PM

It's 99.9% sure an standard HD44780 LCD.

Remove the LCD board from the bigger board (the little pcb with the 14 pins connected to the big board)

http://home.iae.nl/users/pouweha/lcd/lcd0.shtml contains hd44780 interface information

**Jay.slovak** · 26th May 2005, 06:23 PM

Quote:

Originally Posted by Exo

It's 99.9% sure an standard HD44780 LCD.

Remove the LCD board from the bigger board (the little pcb with the 14 pins connected to the big board)

http://home.iae.nl/users/pouweha/lcd/lcd0.shtml contains hd44780 interface information

I would do that, but he wants to keep the whole board...

Exo · 27th May 2005, 10:51 AM

I wouldn't waste my time figuring out a board wich only holds such simple things like LED's & switches. All things you can do easely yourself.

Joseph Papier · 30th May 2005, 10:02 PM

keeping the board won't be a problem: the connector under it is nearly directly connected to the LCD and other things.

my friend gave me these 2 links which might be enough for me to undertand it all:
http://home.iae.nl/users/pouweha/lcd/lcd0.shtml#hd44780
http://www.geocities.com/SiliconVall...lcd/index.html

the point will be to understand the PIC... but another friend of mine who knows PICs very well wants to make a generic LCD program for PIC, so I'll work with him.

thanx for you help, i'll post again here as i progress.

**Nigel Goodwin** · 31st May 2005, 09:06 AM

Quote:

Originally Posted by Joseph Papier

keeping the board won't be a problem: the connector under it is nearly directly connected to the LCD and other things.

my friend gave me these 2 links which might be enough for me to undertand it all:
http://home.iae.nl/users/pouweha/lcd/lcd0.shtml#hd44780
http://www.geocities.com/SiliconVall...lcd/index.html

the point will be to understand the PIC... but another friend of mine who knows PICs very well wants to make a generic LCD program for PIC, so I'll work with him.

thanx for you help, i'll post again here as i progress.

Check my tutorials, they have reliable proven LCD routines.

**bryan1** · 31st May 2005, 09:10 AM

sorry wrong post

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26th May 2005, 12:06 PM	#1
Joseph Papier	any information about LCD from old HP laser printer Hello if ever some of you have taken parts from old equipments, maybe you can help me... i've extracted the LCD block from an old HP laser printer that standed in the trash... it is a LCD board mounted on a small motherboard with 8 push buttons, 7 LEDs, 2 ICs (schmidt trigger inverters), a connector to the printer's main board, and a bunch of R and C. the only things i can see are PC-PJ310 and MHE47794V-O (on the LCD board) and RH6-3146 and EDM-CPK7G00C 5420S A02 (on the other side of the LCD board). the LCD board is connected to the button board by 14 bridges. Any idea how i could figure out what LCD it is, so that i can pilot it? Thanx a lot in advance, joPap

26th May 2005, 04:18 PM	#3
Joseph Papier	thank you! i've showed it to a friend (who must on this forum too, i guess) who told me the same thing. i think i'll keep it on its board though, because it's quite well made: bigger pictures here i would like to interface it with a computer, i thought of using a PIC for the 14 lines to the LCD, the 7 LEDs, and the 8 buttons, and a RS232 serial port to the computer. does it seem ok? thanx a lot for your quick answer!

26th May 2005, 06:07 PM	#5
Exo	It's 99.9% sure an standard HD44780 LCD. Remove the LCD board from the bigger board (the little pcb with the 14 pins connected to the big board) http://home.iae.nl/users/pouweha/lcd/lcd0.shtml contains hd44780 interface information

27th May 2005, 10:51 AM	#7
Exo	I wouldn't waste my time figuring out a board wich only holds such simple things like LED's & switches. All things you can do easely yourself.

30th May 2005, 10:02 PM	#8
Joseph Papier	keeping the board won't be a problem: the connector under it is nearly directly connected to the LCD and other things. my friend gave me these 2 links which might be enough for me to undertand it all: http://home.iae.nl/users/pouweha/lcd/lcd0.shtml#hd44780 http://www.geocities.com/SiliconVall...lcd/index.html the point will be to understand the PIC... but another friend of mine who knows PICs very well wants to make a generic LCD program for PIC, so I'll work with him. thanx for you help, i'll post again here as i progress.

31st May 2005, 09:10 AM	#10
bryan1	sorry wrong post __________________ " The only way to avoid human error is to avoid the use of humans"