2. The Optimac power supply uses a transformer which is available from SatCure.
3. The main problems with the Churchill are bad connections or corrosion in the IC sockets.
"Disconnect pins 10 & 12 in lead for Mac based input. And short pin 10 to 12 in Scart connector for Pal based input."
What this means is that you should *always* cut the wires from pins 10 and 12 inside your Scart plug (label it "decoder end"). Leave the wires from these pins about 12mm long in case you need to connect 10 and 12 together. If your receiver can give MAC deemphasised output, select this in its menu (or however it is selected). If your receiver gives only PAL deemphasised baseband video output, connect pins 10 and 12 together inside the Scart plug at the decoder end of the cable.
You should always cut wires 10 and 12 in the Scart plug. Do NOT connect them to the receiver.
7. Where can I get my Churchill decoder repaired?
Tel 0161 794 8441
WHISTLING OR PULSING POWER SUPPLY
I have 2 CHURCHILL Multimac D/D2Mac Multi card system,
October 3, 1998
Your electrician is mistaken. All that you need to do is to replace three capacitors as follows:
C51 22uF/105°C/low ESR (causes high pitch whistling) replaces 10uF.
I do not want to sell you a repair kit just for this :o)
Hi Repairman !
Let's hope this information will help some of your "readers".
For reception of D Mac transmission , I have been sent the following solution by Alfaglade:
"Modification for receivers with poor HF baseband output.
They also sent me a fax to locate more easily the R90. This fax is not on my computer and as I don't have a separate fax , I can't send it to you now. I will try to scan and send it if you insist. But I think all resistors and capacitors are numbered on the pcb.
My decoder is connected with a scart to my Pace MSS 1001 IP , (decoder output Mac , Auto) and it works now perfectly since 30.10.95 , when I did the modification!!
Gavin, I'm very sorry. I actually *published* this solution in "What Satellite TV" magazine "Troubleshooter" section (Page 24 Dec 1998 edition) !!!
Frankly, I had forgotten because it was a solution given to me by somebody else a couple of months ago and not one that I had found myself when I *used* to repair these things.
I'm really grateful to you for setting me straight on this. Why your question didn't ring loud bells in my head, I simply don't know!
Thanks once again for taking the trouble to let me know and I'm extremely pleased that you solved your problem :o))
BTW the easiest way to fix this problem is to locate inductor "L6" just to the left of "U8".
With the Alfaglade Optimac, I mounted your fan on the card reader housing and
>I have a Sky Analogue system comprising a Pace MSS1000 receiver and a
>Churchill Decoder, with two dishes connected. one to Astra 19.2 and one to
>Eutelsat Hotbird. Everything was working fine with this set up and I could
>receive D2Mac signals through the Churchill.
>Just before Xmas I had Sky Digital installed with a separate digidish, and
>had the Digital receiver connected through the MSS1000 (to the AV1 socket)
>so as to retain the Dolby surround sound.
>Ever since then I have been unable to receive any D2Mac signals and I don't
>know whether the Digital connection is over riding the D2Mac or what the
>I can receive a perfect picture in clear Pal on the Eutelsat satellite on
>all channels but as soon as a D2Mac signal is transmitted I get no signal
>although the screen appears to be trying to receive the signal ie I get a
>fuzzy scrambled clear screen as opposed to a fuzzy scrambled green screen
>with a D2Mac signal.
>I assumed the problem was dish related but I have had the dish alignment
>checked and it is receiving a really strong signal.
>Could you suggest any other cause, for example could it be the Churchill
>decoder that is at fault?
>I'm not convinced the Digital installation is the cause of the problem for
>if I disconnect the Digireceiver from the MSS1000, which in effect reverts
>back to the old setup, the problem is still there.
> Mike Andrew
January 10, 2000
The last time someone reported this problem to us, it took a full SIX
months to determine the cause. What was it?
Well, he'd been given a gold-plated Scart-Scart lead TWO METRES in length
for Christmas. He'd used this to connect the Churchill and it had not
worked since. However, he omitted to tell us this. In fact he told us
that *nothing* had been changed and that the system simply stopped
He called out an installation engineer from the shop where he'd bought
the system FOUR times before the guy realised what the cause was. A 0.5
metre Scart lead cured the problem and the expensive 2 metre gold-plated
one was consigned to the waste basket. Needless to say, it cost him a fortune
for the call outs.
So, may I recommend you look at your Scart lead first? Use the one that
it always worked with. Some of these have to be connected a certain way
round for the later Churchills because pins 10 and 12 determine the PAL
or MAC input requirement and are specially wired at the Churchill end.
It's essential to determine whether your problem is caused by the Scart
lead, the decoder, the MSS1000 or the Digibox. Start by disconnecting the
Digibox entirely and replacing the original connections as they were.
If you can't get the decoder to work by yourself, all I can suggest is
that you take it to a specialist shop and pay them to test it.
I would personally change the small PSU electrolytics every year.
The CCU3000 microcontroller might have died if the 5 volt supply went too high (caused by PSU capacitors).
If you can't see any capacitor bulging then it's a good idea to actually measure the dc output voltages from the PSU, if you know how. If you don't know how then I recommend you take it to someone who does, rather than risk damaging it (or yourself). :o)
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