Turning on a (long) stored RiscPC and I have no keyboard response.
No lights on the (Acorn) keyboard either.
I vaguely recall details about a fuse or on board component fix for
this, though never really had to do it.
Changing keyboards around used to finally get things going, but I
have yet to find my box of PS2 keyboards.
65Mb memory is reported before the supervisor prompt so it looks
promising otherwise.
Thanks for any help, I am getting the machine ready for someone who
used Acorn at school and wants to revisit the RiscPC style of RISC OS.
Ronald M.
In message <2dfa4ad258.beeb@-.->
Ronald <gettingchoppy@gmail.com> wrote:
Turning on a (long) stored RiscPC and I have no keyboard response.
No lights on the (Acorn) keyboard either.
I vaguely recall details about a fuse or on board component fix for
this, though never really had to do it.
Changing keyboards around used to finally get things going, but I
have yet to find my box of PS2 keyboards.
65Mb memory is reported before the supervisor prompt so it looks
promising otherwise.
Thanks for any help, I am getting the machine ready for someone who
used Acorn at school and wants to revisit the RiscPC style of RISC OS.
Ronald M.
I had a look at the TRM and the schematic mentioned fused supply.
The circuit board has a couple of fuses in the area, they both have cpntinuity, so I tried again.
Breifly 3 lights lit up at power up, so I eventually ended up doing
a shift R power up, and have go a 640x480 desktop with HD now.
While looking at the circuit diagram, I was reminded of the battery
being 1.2v rechargeable by the looks, so this will be the next job
to do.
Possibly a AAA nimh though I'm sure I seen an AAAA size (just shorter) recently.
Ron
While looking at the circuit diagram, I was reminded of the battery
being 1.2v rechargeable by the looks, so this will be the next job
to do.
Possibly a AAA nimh though I'm sure I seen an AAAA size (just shorter) recently.
Ron
I think CJE has the correct size replacements.
In message <2dfa4ad258.beeb@-.->
Ronald <gettingchoppy@gmail.com> wrote:
Turning on a (long) stored RiscPC and I have no keyboard response.
No lights on the (Acorn) keyboard either.
I vaguely recall details about a fuse or on board component fix for
this, though never really had to do it.
Changing keyboards around used to finally get things going, but I
have yet to find my box of PS2 keyboards.
65Mb memory is reported before the supervisor prompt so it looks
promising otherwise.
Thanks for any help, I am getting the machine ready for someone who
used Acorn at school and wants to revisit the RiscPC style of RISC OS.
Ronald M.
I had a look at the TRM and the schematic mentioned fused supply.
The circuit board has a couple of fuses in the area, they both have cpntinuity, so I tried again.
Breifly 3 lights lit up at power up, so I eventually ended up doing
a shift R power up, and have go a 640x480 desktop with HD now.
While looking at the circuit diagram, I was reminded of the battery
being 1.2v rechargeable by the looks, so this will be the next job
to do.
Possibly a AAA nimh though I'm sure I seen an AAAA size (just shorter) recently.
In message <58d25445eacharles@candehope.me.uk>
charles <charles@candehope.me.uk> wrote:
<snip>
Yes I know Chris has experience in these matters and there is a can of
While looking at the circuit diagram, I was reminded of the battery
being 1.2v rechargeable by the looks, so this will be the next job
to do.
Possibly a AAA nimh though I'm sure I seen an AAAA size (just shorter)
recently.
Ron
I think CJE has the correct size replacements.
worms around the RTC battery replacement.
I have imformed the purchaser of these possibilities, and he feels he
will cope with them.
At the moment the battery is not charging beyond .43 V and the machine
wont boot properly unless R is held down.
May be insufficient to hold the cmos up and hopefully a new battery will
fix this issue.
Ron
At the moment the battery is not charging beyond .43 V and the
machine wont boot properly unless R is held down. May be insufficient
to hold the cmos up and hopefully a new battery will fix this issue.
In article <9f1751d258.beeb@-.->,
Ronald <gettingchoppy@gmail.com> wrote:
In message <2dfa4ad258.beeb@-.->
Ronald <gettingchoppy@gmail.com> wrote:
Turning on a (long) stored RiscPC and I have no keyboard response.
No lights on the (Acorn) keyboard either.
I vaguely recall details about a fuse or on board component fix for
this, though never really had to do it.
Changing keyboards around used to finally get things going, but I
have yet to find my box of PS2 keyboards.
65Mb memory is reported before the supervisor prompt so it looks promising otherwise.
Thanks for any help, I am getting the machine ready for someone who
used Acorn at school and wants to revisit the RiscPC style of RISC OS.
Ronald M.
I had a look at the TRM and the schematic mentioned fused supply.
The circuit board has a couple of fuses in the area, they both have cpntinuity, so I tried again.
Breifly 3 lights lit up at power up, so I eventually ended up doing
a shift R power up, and have go a 640x480 desktop with HD now.
While looking at the circuit diagram, I was reminded of the battery
being 1.2v rechargeable by the looks, so this will be the next job
to do.
Possibly a AAA nimh though I'm sure I seen an AAAA size (just shorter) recently.
I've not had a flat battery cause the keyboard not to be recognised. The battery is to keep the user part of the memory alive when powered down -
and don't remember the keyboard being part of that. But try leaving it on
for 24 hours - monitor switched off.
It's not difficult to change the battery - but look for signs of corrosion
to the MB beside it caused by leakage, which can be serious.
Cut the old off the MB leaving tails. Solder the new to the tails.
I haven't encountered the keyboard issue before either, but it is
possible that previously the batteries were still capable of taking a
charge. This one is not. Yes to snipping and soldering, though I might
use a gas heated soldering iron and fit the battery flattened so as not
to shock the RTC into life with the full voltage. Chris Evans has
stories of the RTC not surviving, so I am being over cautious.
In article <11bf89d258.beeb@-.->,
Ronald <gettingchoppy@gmail.com> wrote:
I haven't encountered the keyboard issue before either, but it is
possible that previously the batteries were still capable of taking a charge. This one is not. Yes to snipping and soldering, though I might
use a gas heated soldering iron and fit the battery flattened so as not
to shock the RTC into life with the full voltage. Chris Evans has
stories of the RTC not surviving, so I am being over cautious.
No.
Snip the battery off the board. If a proper temperature controlled desoldering station, capable of doing the job is available, you can remove the old bits of lead if you like.
Gently swab the area with white vinegar to ensure there is no alkali remaining from Battery leakage.
Rinse with PURE water, followed by IPA and leave to dry.
Mount a AAA Ni-MH in a holder, off the board, and wire to the motherboard.
As Alan Griffin says, it is a good idea to pre-charge the battery before fitting otherwise it will take a long time to charge.
In message <58d293ecbfSpambin@argonet.co.uk><snip>
Stuart <Spambin@argonet.co.uk> wrote:
In article <11bf89d258.beeb@-.->,
Ronald <gettingchoppy@gmail.com> wrote:
Have fitted a holder and battery but got no change
The symptom of repeatedly having to use 'R' to boot the hard drive, is
(of course) the cmos not working, also it is not possible to set the
time, or set configure settings. There must be a default of using ADFS
drive 4 and set to boot that allows things to proceed to a desktop. It's
a shame that the supervisor prompt doesn't take input, (OS 3.7) Aside
from the clock not being settable, it does increment and the machine
could be used this way.
I pulled out a second RiscPC and got exactly the same results.
A third one, worked before and after the new battery, intially halted
with 'abort on data transfer' after battery was changed.
One 'R' start was enough to get things back to normal.
This machine was the most recently used and had less salt deposits.
I have a low voltage (too low to switch siliicon) continuity checker
and with a working motherboard next to one that has damaged tracks
should be able to find the culprits and either solder enamelled wire.
I haven't tried the pen applicators that reportedly can lay down a
track, maybe it is time to.
Ronald
In message <1b5a1ed358.beeb@-.->
Ronald <gettingchoppy@gmail.com> wrote:
In message <58d293ecbfSpambin@argonet.co.uk>
Stuart <Spambin@argonet.co.uk> wrote:
<snip>In article <11bf89d258.beeb@-.->,
Ronald <gettingchoppy@gmail.com> wrote:
Have fitted a holder and battery but got no change
The symptom of repeatedly having to use 'R' to boot the hard drive, is
(of course) the cmos not working, also it is not possible to set the
time, or set configure settings. There must be a default of using ADFS drive 4 and set to boot that allows things to proceed to a desktop. It's
a shame that the supervisor prompt doesn't take input, (OS 3.7) Aside
from the clock not being settable, it does increment and the machine
could be used this way.
I pulled out a second RiscPC and got exactly the same results.
A third one, worked before and after the new battery, intially halted
with 'abort on data transfer' after battery was changed.
One 'R' start was enough to get things back to normal.
This machine was the most recently used and had less salt deposits.
It sounds like you have two separate problems - the CMOS chip isn't
working, either faulty, disconnected, or I read somewhere that they can refuse to restart if left powered down for too long - and a separate fault
on the keyboard connection.
It's a bit surprising that two computers have the same two faults, but
maybe circuit traces close together have been damaged by battery leakage
in both cases.
Turning on a (long) stored RiscPC and I have no keyboard response.
No lights on the (Acorn) keyboard either.
I vaguely recall details about a fuse or on board component fix for
this, though never really had to do it.
Changing keyboards around used to finally get things going, but I
have yet to find my box of PS2 keyboards.
65Mb memory is reported before the supervisor prompt so it looks
promising otherwise.
Thanks for any help, I am getting the machine ready for someone who
used Acorn at school and wants to revisit the RiscPC style of RISC OS.
Ronald M.
In message <2dfa4ad258.beeb@-.->
Ronald <gettingchoppy@gmail.com> wrote:
Turning on a (long) stored RiscPC and I have no keyboard response.
No lights on the (Acorn) keyboard either.
I vaguely recall details about a fuse or on board component fix for
this, though never really had to do it.
Changing keyboards around used to finally get things going, but I
have yet to find my box of PS2 keyboards.
65Mb memory is reported before the supervisor prompt so it looks
promising otherwise.
Thanks for any help, I am getting the machine ready for someone who
used Acorn at school and wants to revisit the RiscPC style of RISC OS.
Ronald M.
I seem to recall this problem with an A5000 years ago and that turned out
to be a fuse - but it probably just looks like an ordinary component
soldered into the printed circuit board. Might be worth ringing CJE to
see if they have any advice?
David
In message <ff765dd458.david.cal@david.callaghan.argonet.co.uk>
David Callaghan <david@callaghand.plus.com> wrote:
In message <2dfa4ad258.beeb@-.->
Ronald <gettingchoppy@gmail.com> wrote:
Turning on a (long) stored RiscPC and I have no keyboard response.
No lights on the (Acorn) keyboard either.
I vaguely recall details about a fuse or on board component fix for
this, though never really had to do it.
Changing keyboards around used to finally get things going, but I
have yet to find my box of PS2 keyboards.
65Mb memory is reported before the supervisor prompt so it looks promising otherwise.
Thanks for any help, I am getting the machine ready for someone who
used Acorn at school and wants to revisit the RiscPC style of RISC OS.
Ronald M.
I seem to recall this problem with an A5000 years ago and that turned out to be a fuse - but it probably just looks like an ordinary component soldered into the printed circuit board. Might be worth ringing CJE to
see if they have any advice?
David
There /is/ a smd fuse for the keyboard which is fine.
Due to lack of lights, the keyboard appeared dead.
But the machine was locked at the supervisor prompt because of no access
to the cmos.
RISC OS (3.7) doesn't allow to continue with the keyboard,
and a repower with 'R' pressed is required.
I see your point, found a batch of PCF8563
In message <1b5a1ed358.beeb@-.->
Ronald <gettingchoppy@gmail.com> wrote:
In message <58d293ecbfSpambin@argonet.co.uk>
Stuart <Spambin@argonet.co.uk> wrote:
<snip>In article <11bf89d258.beeb@-.->,
Ronald <gettingchoppy@gmail.com> wrote:
Have fitted a holder and battery but got no change
The symptom of repeatedly having to use 'R' to boot the hard drive, is
(of course) the cmos not working, also it is not possible to set the
time, or set configure settings. There must be a default of using ADFS
drive 4 and set to boot that allows things to proceed to a desktop. It's
a shame that the supervisor prompt doesn't take input, (OS 3.7) Aside
from the clock not being settable, it does increment and the machine
could be used this way.
I pulled out a second RiscPC and got exactly the same results.
A third one, worked before and after the new battery, intially halted
with 'abort on data transfer' after battery was changed.
One 'R' start was enough to get things back to normal.
This machine was the most recently used and had less salt deposits.
It sounds like you have two separate problems - the CMOS chip isn't
working, either faulty, disconnected, or I read somewhere that they can refuse to restart if left powered down for too long
In article <3300a4d458.beeb@-.->, Ronald<snip>
<URL:mailto:gettingchoppy@gmail.com> wrote:
Yes, should have typed PCF8583, and it is what I have ordered,There /is/ a smd fuse for the keyboard which is fine.
Due to lack of lights, the keyboard appeared dead.
But the machine was locked at the supervisor prompt because of no access
to the cmos.
RISC OS (3.7) doesn't allow to continue with the keyboard,
and a repower with 'R' pressed is required.
IIRC power on R resets software settings
Power on 'delete' also resets hardware.
I'd try a Power on 'delete' though I doubt it will fix youre symptoms.
I see your point, found a batch of PCF8563
typo? PCF8583!
The ...63 is clock only
n.b. If you don't get a POST flashing of the floppy drive the CMOS is working.
i.e. changing the 8583 won't fix it.
Chris Evans
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