Cyrus One - Page 3

anatech · 3rd July 2006, 05:09 PM

Hi hacknet,
Do you plan on doing more of this work?
What equipment do you have?

I can't help avoid bad things happening if you don't have some of the basic things to service properly. So you have to ask yourself if you should get some service gear, or send the amp for service. There is a reason the better servie techs are worth their weight in gold. And some of them are pretty heavy!

-Chris

hacknet · 3rd July 2006, 06:00 PM

well, i can bring it down to school but that is a hassle...

i think i can get by...

richie00boy · 3rd July 2006, 06:27 PM

As well as replacing the drivers, it would be worth checking the base and emitter resistors of the drivers and output devices. The Cyrus 2 I repaired took out one of these.

Don't mess about putting in cheap outputs then getting it working then swapping them for better ones as you will only ruin the PCB, just power it safely in the first place. Use 100 ohm resistors instead of the fuses if you can't get use of a proper bench supply.

hacknet · 3rd July 2006, 06:38 PM

thanks for the advice man!

i have a good feeling that i have actually busted the emmiter resistors too!

i'll check and report back!

anatech · 4th July 2006, 03:19 PM

Quote:

i have a good feeling that i have actually busted the emmiter resistors too!

I'm impressed.

Doing a job right normally is inconvenient.

-Chris

hacknet · 4th July 2006, 05:14 PM

the emmitor resistors are all fine... looks like i have to replace only the transistors...

richie00boy · 4th July 2006, 05:32 PM

Did you check all driver and predriver ones as well?

hacknet · 4th July 2006, 05:33 PM

the op devices are gone, 1 channel's drivers are dead, the predrivers are fine. the vbe multipler are alright.

richie00boy · 4th July 2006, 05:50 PM

I was talking about resistors...

I'd replace both channels drivers as a matter of routine as well. I've known them measure OK on diode check but go cranky not long after using again.

hacknet · 4th July 2006, 06:00 PM

the resistors are just perfect!

i got dodgy 3055s once and they gave way almost immediatly although the meter said they were perfect... after checking everything, a new pair of ST ones did the trick.

3rd July 2006, 06:27 PM	#23
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	As well as replacing the drivers, it would be worth checking the base and emitter resistors of the drivers and output devices. The Cyrus 2 I repaired took out one of these. Don't mess about putting in cheap outputs then getting it working then swapping them for better ones as you will only ruin the PCB, just power it safely in the first place. Use 100 ohm resistors instead of the fuses if you can't get use of a proper bench supply. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

4th July 2006, 05:32 PM	#27
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Did you check all driver and predriver ones as well? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

4th July 2006, 05:50 PM	#29
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I was talking about resistors... I'd replace both channels drivers as a matter of routine as well. I've known them measure OK on diode check but go cranky not long after using again. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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3rd July 2006, 05:09 PM	#21
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi hacknet, Do you plan on doing more of this work? What equipment do you have? I can't help avoid bad things happening if you don't have some of the basic things to service properly. So you have to ask yourself if you should get some service gear, or send the amp for service. There is a reason the better servie techs are worth their weight in gold. And some of them are pretty heavy! -Chris

3rd July 2006, 06:00 PM	#22
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	well, i can bring it down to school but that is a hassle... i think i can get by...

3rd July 2006, 06:38 PM	#24
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	thanks for the advice man! i have a good feeling that i have actually busted the emmiter resistors too! i'll check and report back!

4th July 2006, 05:14 PM	#26
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	the emmitor resistors are all fine... looks like i have to replace only the transistors...

4th July 2006, 05:33 PM	#28
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	the op devices are gone, 1 channel's drivers are dead, the predrivers are fine. the vbe multipler are alright.

4th July 2006, 06:00 PM	#30
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	the resistors are just perfect! i got dodgy 3055s once and they gave way almost immediatly although the meter said they were perfect... after checking everything, a new pair of ST ones did the trick.

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