18 Mar
2010
18 Mar
'10
9:40 p.m.
I aquired a HP 2671A thermal printer and know that there should be an
upgrade ROM to 'upgrade' it to a HP 2671G.
Thanks to Tony excelent work on HPCC CDROM i have the schematics and was
able to fix the head positioning circuit.
One of the driver transistors (TIP 122) was bad after replacing it and
cleaning the printer it works fine.
But now I want to use it for printing graphics (diagrams) and would be very
happy whith an image of the graphics ROM.
-Rik
PS. don't shoot me if it appears a second time, I used the first time the
wrong email address.......:-(
19 Mar
19 Mar
7:06 p.m.
I aquired a HP 2671A thermal printer and know that there should be an
upgrade ROM to 'upgrade' it to a HP 2671G.
Thanks to Tony excelent work on HPCC CDROM i have the schematics and was
able to fix the head positioning circuit.
One of the driver transistors (TIP 122) was bad after replacing it and
cleaning the printer it works fine.
You will find it prints on thermal fax paper without problems. But get
the 216mm wide stuff. I got some 210mm rolls and found it would print on
them without snagging the papepr if oyu got it positioned just right. I
turned a cuuple of brass spacers, but it's a lot less work to get the
right width paper.
But now I want to use it for printing graphics
(diagrams) and would be very
happy whith an image of the graphics ROM.
If you like I can pull the cover on my 2671G and see what the 3
programmed devices (2 8049 microcontrollers and a ROM) are labelled, and
the setting fo the EA pin switches on each of the boards (to see if the
8049 is using its intenal ROM). That will indicate what needs to be
replaced in your machine....
-tony
8:45 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
Verzonden: vrijdag 19 maart 2010 20:06
Aan: cctalk at classiccmp.org
Onderwerp: Re: HP 2671 Graphics ROM
Thanks , HP was talking about adding a graphics chip (ROM).
The 2671 has an empty socket on the HP-IB interface board, the one closest
to the printer PCB is empty.
I'm not sure if that's the one, it could be the ROM on the printer PCB it
self.
It would be very nice if you find out what needs to be replaced, on the
printer PCB on the one I have a 8039 with external ROM is used.
I've a stach of 216mm wide fax paper from a fax I owned .
-Rik
I aquired a HP 2671A thermal printer and know that there
should be
an upgrade ROM to 'upgrade' it to a HP
2671G.
Thanks to Tony excelent work on HPCC CDROM i have the
schematics and
was able to fix the head positioning circuit.
One of the driver transistors (TIP 122) was bad after
replacing it and
cleaning the printer it works fine.
You will find it prints on thermal fax paper without
problems. But get the 216mm wide stuff. I got some 210mm
rolls and found it would print on them without snagging the
papepr if oyu got it positioned just right. I turned a cuuple
of brass spacers, but it's a lot less work to get the right
width paper.
But now I want to use it for printing graphics
(diagrams)
and would be
very happy whith an image of the graphics ROM.
If you like I can pull the cover on my 2671G and see what the
3 programmed devices (2 8049 microcontrollers and a ROM) are
labelled, and the setting fo the EA pin switches on each of
the boards (to see if the
8049 is using its intenal ROM). That will indicate what needs
to be replaced in your machine....
-tony
9:07 p.m.
Thanks , HP was talking about adding a graphics chip
(ROM).
My printer -- the one the schematics were produced from -- is a 2671G.
The 2671 has an empty socket on the HP-IB interface
board, the one closest
to the printer PCB is empty.
I think mine does too. I am pretty sure I indicated that the external ROM
for that microcontroller was 'N/F' (meaning 'Not Fitted'). You could use
a 8039 microcnotrller and an extenal ROM or an 8049. One of the switches
on the itnerface board sets the state of the EA pin
I'm not sure if that's the one, it could be
the ROM on the printer PCB it
self.
I am also almost certain that my printer PCB has an external ROM. I think
it's an 8049 microcnnotroller on there too. Again, I would have to check
the settings of the swithes to see if the interal ROM of that
microcontroller is used). Of course an 8049 with EA pulled hich acts just
like an 8039 AFAIK.
It would be very nice if you find out what needs to be
replaced, on the
printer PCB on the one I have a 8039 with external ROM is used.
I should have some time tomorrow to pull the covers and check. We can
compare our 2 machines to see jsut what the differences are.
-tony
9:29 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
Verzonden: vrijdag 19 maart 2010 22:08
Aan: cctalk at classiccmp.org
Onderwerp: Re: HP 2671 Graphics ROM
Seems a good idea, I'll write down the part numbers so we can compare.
-Rik
Thanks , HP was talking about adding a graphics
chip (ROM).
My printer -- the one the schematics were produced from -- is
a 2671G.
The 2671 has an empty socket on the HP-IB
interface board, the one
closest to the printer PCB is empty.
I think mine does too. I am pretty sure I indicated that the
external ROM for that microcontroller was 'N/F' (meaning 'Not
Fitted'). You could use a 8039 microcnotrller and an extenal
ROM or an 8049. One of the switches on the itnerface board
sets the state of the EA pin
I'm not sure if that's the one, it could
be the ROM on the
printer PCB
it self.
I am also almost certain that my printer PCB has an external
ROM. I think it's an 8049 microcnnotroller on there too.
Again, I would have to check the settings of the swithes to
see if the interal ROM of that microcontroller is used). Of
course an 8049 with EA pulled hich acts just like an 8039 AFAIK.
It would be very nice if you find out what needs
to be replaced, on
the printer PCB on the one I have a 8039 with external ROM is used.
I should have some time tomorrow to pull the covers and
check. We can compare our 2 machines to see jsut what the
differences are.
-tony
20 Mar
20 Mar
6:06 p.m.
> > The 2671 has an empty socket on the HP-IB
interface board, the one
> > closest to the printer PCB is empty.
This sounds as though it might be a different cersion of the HPIB board,
but I'll give the numbers in a second.
Seems a good idea, I'll write down the part
numbers so we can compare.
OK, I've dug my 2671G out and taken it apart. I find the instructions on
the bottom very amusing. They tell you 'no user serviceable parts inside'
and then tell you just how to take the cover odd. Go figure...
Anyway
The PSU is a 02670-60070. I would be suprised if there are any changes there.
The HPIB interface is 02670-60072. U14 (2016 RAM) and U15 (ROM) are not
fitted. U2 (an 8049 microcontroller) is 1820-2833. The DIP switches are
set :
1 Open (Mode)
2 Open )2K) -- this has no effect if U15 is not fitted!
3 Closed (Int ROM ) -- this means the 8049 will run from its internal ROM
4 Open (Test)
The printer PCB (on the back of the thermaal print mechansim) seems to be
iether a 02760-60067 or 02670-80084.
U3091 (8049) is 1820-3096
U101 (ROM) is 1818-1819
There is a 10 way dIP switch set as follows :
1 Open
2 Open
3 Closed
4 Open
5 CLosed
6 Closed
7 Open
8 Closed
9 Open
10 Closed
If I am reading the scheamtics properly :
SW8 -> 8049 will run a program from it's internal ROM
SW10 -> power-fail or watchdog tinme-out will casue a rest
Others -> 8K esternal ROM (A12 is used), but note thatsince SW2 is open,
PSEN/ does not enable the ROM. This means that the ROM is for data
storage (font?) only, not for program code.
Unfortunately I don't ahve an 8049 programmer at the moment. It's
something I must get roudn to buidling. Which means I can't dump the
microcotnrollers...
-tony
8:39 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
Verzonden: zaterdag 20 maart 2010 19:07
Aan: cctalk at classiccmp.org
Onderwerp: Re: HP 2671 Graphics ROM
PSU is indeed the same, HP-IB board is the same 02670-60072 Rev.A ROM (U15)
02670-80078, Processor (U2)8039, (U13) Empty socket.
Printerboard 02670-60084 ROM (U101) 1818-1819, Processor (U301) 8049
1820-2731.
Dipswitches are the same, for as far I can see the difference is U301, the
service manual speeks of replacing one chip.
The interface boards seems to be field replaceble, in my opinion it make no
sense to put the graphic rendering on the interface board.
-Rik
> > The 2671 has an empty socket on the
HP-IB interface
board, the one
> > closest to the printer PCB is empty.
This sounds as though it might be a different cersion of the
HPIB board, but I'll give the numbers in a second.
Seems a good idea, I'll write down the part
numbers so we
can compare.
OK, I've dug my 2671G out and taken it apart. I find the
instructions on the bottom very amusing. They tell you 'no
user serviceable parts inside'
and then tell you just how to take the cover odd. Go figure...
Anyway
The PSU is a 02670-60070. I would be suprised if there are
any changes there.
The HPIB interface is 02670-60072. U14 (2016 RAM) and U15
(ROM) are not fitted. U2 (an 8049 microcontroller) is
1820-2833. The DIP switches are set :
1 Open (Mode)
2 Open )2K) -- this has no effect if U15 is not fitted!
3 Closed (Int ROM ) -- this means the 8049 will run from its
internal ROM
4 Open (Test)
The printer PCB (on the back of the thermaal print mechansim)
seems to be iether a 02760-60067 or 02670-80084.
U3091 (8049) is 1820-3096
U101 (ROM) is 1818-1819
There is a 10 way dIP switch set as follows :
1 Open
2 Open
3 Closed
4 Open
5 CLosed
6 Closed
7 Open
8 Closed
9 Open
10 Closed
If I am reading the scheamtics properly :
SW8 -> 8049 will run a program from it's internal ROM SW10 ->
power-fail or watchdog tinme-out will casue a rest Others ->
8K esternal ROM (A12 is used), but note thatsince SW2 is
open, PSEN/ does not enable the ROM. This means that the ROM
is for data storage (font?) only, not for program code.
Unfortunately I don't ahve an 8049 programmer at the moment.
It's something I must get roudn to buidling. Which means I
can't dump the microcotnrollers...
-tony
21 Mar
21 Mar
7:08 p.m.
PSU is indeed the same, HP-IB board is the same
02670-60072 Rev.A ROM (U15)
02670-80078, Processor (U2)8039, (U13) Empty socket.
DO you mean U13 is empty? What about U14? Is there a 2K*8 RAM (2016,
6116) on this board at all?
Printerboard 02670-60084 ROM (U101) 1818-1819,
Processor (U301) 8049
1820-2731.
Dipswitches are the same, for as far I can see the difference is U301, the
I assume the DIP swithc on the HPIB board is set differently because
your board uses an external ROM and mine doesn't.
service manual speeks of replacing one chip.
Right. Sounds like I'd better have a go at buildign a device to read out
8049s...
The interface boards seems to be field replaceble, in
my opinion it make no
sense to put the graphic rendering on the interface board.
I think it was actually user-changeaable (you could swap the interface
board if your needs changed), rather like the HP7225 plotter. You just
undo 2 screws on the back and slide the board out -- without even taking
the case cover off.
-tony
9:46 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
Verzonden: zondag 21 maart 2010 20:08
Aan: cctalk at classiccmp.org
Onderwerp: Re: HP 2671 Graphics ROM
Yes U13 is empty, U14 are empty holes.
No RAM at all on the board, the dipswitch 2K is open too.
So I suppose I can place a 6116 in the U13 socket, and switch the 2K
dipswitch to closed, to have the advantage of a smal hp-ib buffer.
Should speed up data transfer a little..
PSU is indeed the same, HP-IB board is the same
02670-60072
Rev.A ROM
(U15) 02670-80078, Processor (U2)8039, (U13)
Empty socket.
DO you mean U13 is empty? What about U14? Is there a 2K*8 RAM (2016,
6116) on this board at all? Printerboard
02670-60084 ROM (U101) 1818-1819, Processor
(U301) 8049
1820-2731.
Dipswitches are the same, for as far I can see the
difference is U301,
the
I assume the DIP swithc on the HPIB board is set differently
because your board uses an external ROM and mine doesn't.
service manual speeks of replacing one chip.
Right. Sounds like I'd better have a go at buildign a device
to read out 8049s... The interface boards seems to be field
replaceble, in my
opinion it make no
sense to put the graphic rendering on the
interface board.
I think it was actually user-changeaable (you could swap the
interface board if your needs changed), rather like the HP7225
plotter.
You just
undo 2 screws on the back and slide the board out -- without
even taking
the case cover off.
-tony
-Rik
22 Mar
22 Mar
6:19 p.m.
PSU is indeed the same, HP-IB board is the same
02670-60072
Rev.A ROM
(U15) 02670-80078, Processor (U2)8039, (U13)
Empty socket.
DO you mean U13 is empty? What about U14? Is there a 2K*8 RAM (2016,
6116) on this board at all? Right. Sounds
like I'd better have a go at buildign a device
to read out 8049s...
Would be nice..
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