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Old 11th November 2003, 09:08 AM   #1
tubenut is offline tubenut  South Africa
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Default Cyrus 3 Service manual anyone?

I am still having fun L trying to resurrect a Cyrus III amplifier. I have now established that the fault lies on the pre amp input board, but now it gets tricky.
Does anyone out there have a service manual for this unit?

Thanks
Guillaume
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Old 12th November 2003, 12:34 PM   #2
Did it Himself
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I'm fixing my mates Cyrus 2. Bought a service manual from Cyrus for 18. www.cyrusaudio.com I think, but the last 2 emails I sent them I got no reply...

The manual is not all that great, but at least I've got schematics to work from now.
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Old 13th November 2003, 05:04 AM   #3
tubenut is offline tubenut  South Africa
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I know about the manual from Cyrus, I sent an e mail some time ago and they offered the manual for GBP 17.55 or so. I did not order then. Since thenm I have tried again and have received no reply at all.......
Their response to my PSXR to standalone use question was a little patronising as well.....

Rgds
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Old 13th November 2003, 09:02 AM   #4
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Yes, I was annoyed that they didn't reply to my emails as well, especially as I was asking to buy parts from them!

What was your question on the PSX - I may be able to help. In fact I was thinking about using the PSX and building my mate a new amp to go with it.
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Old 13th November 2003, 10:19 AM   #5
tubenut is offline tubenut  South Africa
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I just wanted to revert the unit to normal non PSX operation, I did get a reply to that query on this forum already. I also just got an e mail from Cyrus, GBP17.55 for a service manual or GBP72.00 for a new input board.

G
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Old 13th November 2003, 07:27 PM   #6
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Guillaume

Please pardon my ignorance but how complex is that board? Can you post pics? I have a strong feeling that we'll fix it without a service manual.
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Old 14th November 2003, 05:34 AM   #7
tubenut is offline tubenut  South Africa
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I believed so 2 Peter....

I do not own a digital camera and probably never will.... then again I do own a CD player for convenience and availability of music so maybe when they get even cheaper and nastier....
The Cyrus 3 is microprocessor controlled for input switching and volume control. The input board I believe includes pre amp, volume and RIAA as well as psu for these. Only the PSU components are not surface mount. The various digital/analolog switches and op amps are surfacemount. If they were not I would spend ZAR100 / USD 15 on some parts and replace all semis.
I am going to buy the manual, me and a buddy have spent 2 many hours already........
The real problem is that as long as there is a fault the amp shuts down making any testing/measurement seriousy tough.
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Old 20th June 2004, 11:54 AM   #8
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I tried to get a service manual for Cyrus III and was told to send the unit in.I have a faulty one aswell and beleve it is the pre board but that micropro makes it hard to test.If you get a manual tell me how much for a photocopy and i will pay PLEASE.
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Old 20th June 2004, 12:36 PM   #9
anatech is offline anatech  Canada
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Default Authorized service

Hi All,
I do authorized service for this brand. I don't have a scanner but perhaps we can talk it through.
The protection circuits can confuse you, sometimes the failure is there.
Guillaume, I haven't seen a fault on that board yet, so this is a first. I use a longer flex cable so I can flip everything apart to troubleshoot. A question. Why do you think the fault is on the preamp PCB assy? I just need to start somewhere here.
-Chris
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Old 20th June 2004, 06:22 PM   #10
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I am guessing at the fault.It is dead.No lights.
I have checked to see if the power amp and pre amp boards have power and they do.So I thought the mPro might be failing????
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