Zero 1 Known Faults? advice on Master/Micromimic Console

[Darren]

Hiya
I am in the process of setting up a new layout using Hornby zero 1
kit. Since i have the kit its far cheaper than to go DCC at present.

I have an odd fault though with the Micromimic Control Console. It
does not respond to the key numbers as it should. Have two consoles
both do the same. Both have new batteries and PCB on one fully
repaired. Both same symptoms.

Oddly though I am suspecting the Master controller. There seems to be
7V DC on the output as well as the 24V AC signal.
The controller works fine for loco operation and accessory unit
operations. Its Just the Micromimic console odd response.

The Master power led is flickering also, is this normal? The unit is
also not silent and emits almost a ticking sound, the accessory units
also do the same. I have a pretty good schematic but not full circuit
diagram, but as fas as i can see I should have no DC on the output.

Can anyone measure their Master and check for any DC presence please?

I am asking for anyone with previous faults to perhaps list here to
create a known database of fault.

If anyone needs advice on Master Keyboard repair, this is very easy.
-Drill out the rivets to gain access to the unit
-Remove the keypad pcb
-Clean the contacts if corroded, very fine sanding works a treat,
otherwise contact cleaner should only be required.
-The rubber keypad is normally hat fails
-To repair the Rubber keypad, simply use the Hornby Coding Paint used
on modules, and re-paint the black pads.
-Re-assemble
-Test and you should find it works perfectly.
-Suggest to use nut and bolts to re-assemble the unit for easy access
the next time
- Not the right side of the unit must be flush to allow slave
controller connection, so leave the rivets/fixings out is simplest.


Any help on if the Power LED flickers at all on your Master or if
anyone can quickly measure the output voltage for DC would be
appreciated.

Darren

[Robert Flint]

"Darren" <ukmin...@gmail.com> wrote in message
news:5f5ca440-8889-4b32...@l14g2000vbe.googlegroups.com...

>
> Any help on if the Power LED flickers at all on your Master or if
> anyone can quickly measure the output voltage for DC would be
> appreciated.
>
> Darren

I have not had my Zero 1 powered up for at least 25 years but yes, I do
remember that the green power light flickered and the unit emitted a sort of
ticking noise.

ROB

[Darren]

On Feb 9, 7:12 pm, "Robert Flint" <R...@nospam.com> wrote:
> "Darren" <ukmini....@gmail.com> wrote in message
>
> news:5f5ca440-8889-4b32...@l14g2000vbe.googlegroups.com...
>
> Great stuff Rob, confirms I think the Master is fine. I have another Master in the post to me also.

[Darren]

Small update,
The flicker is for sure standard, got the mimic system working fine,
the markings on the rear, A and B are in-correct, A-B and B to A and
all works! I don't have the original lead hence didn't see this until
i thought what the hell, just swap them and try anyway.
Now have three fully refurbished and working mimic consoles including
new batteries!

Now to get laying some track, will have a fully working Retro DCC Zero
1 system working with full mimic system!

Darren

[MartinS]

sral...@aol.com wrote:

Just wondering why you have reposted this 5-year-old post. Is the OP
still trying to get his Zero 1 to work? Or are you the OP?

--
Martin S

[sral...@aol.com]

Hi Darren, where did you get your micromimic units refurbed?
Thanks.

[bowma...@gmail.com]

I know it's years since you posted this but I'll try.

Any idea why zero one master suddenly stays on overload. It worked great for weeks since I took it out of the loft now even with the wires not connected to the track it goes to overload.

Please help

[sswcharlie]

Hi

Join this group. https://hornby-zero-1.forumotion.com/

Also quite possible the keyboard pad needs cleaning or repair the rubber carbon button needs repair. Use tinfoil, a small dot and glue in. Also tactile switches can be used . (enquire on the new group they have info I think. When pressed this joins the tracks together and processes the instruction. The carbon could be broken on one key and hanging down causing it to short or the reset button not working for the same reason.
Charlie
NZ

[bowma...@gmail.com]

Thanks Charlie, I'll give that a go

[Alan Dawes]

In article <b55620f1-02eb-483e...@googlegroups.com>,

Years ago I got help with my zero-1 from the Model Electronic Railway
Group (MERG) who still have technical bulletins available on zero-1 in the
ZERO section:

https://www.merg.org.uk/tbs.php

If I were you, having drilled out the "rivets" holding the case together,
I would check any capacitors to see if they have deteriorated over the
years and gone short circuit and replace them.

My main problem was the keyboard which I repaired using the MERG
replacement keyboard kit.

Alan

--
alan....@argonet.co.uk
alan....@riscos.org
Using an ARMX6

[AllanG]

replying to Alan Dawes, AllanG wrote:
I'm resurrecting a Zero 1 for the grandkids. The controller works well for
about 60 seconds then stops. I've got to turn it off for a few minutes, then
it starts again for another minute. Sounds like a heat problem. Has anyone
seen this problem? A circuit would be great but no one seems to have one.

--
for full context, visit https://www.polytechforum.com/uk-trains/zero-1-known-faults-advice-on-master-micromimic-console-64155-.htm

[john Nicholson]

[john Nicholson]

On Saturday, 4 December 2021 at 10:18:04 UTC+10, AllanG wrote:

I have all the circuits for these

[Andy Piercy]

Hi,

Would you be able to send me the circuit diagrams you have please?

Also do you know the battery type for the Zero 1 Micromimic display please?

Thanks,

Andy.