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Old 29th August 2009, 08:11 PM   #1
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Default Mis-behaving Cyrus II

Hello!

Forgive a noob posting but I've been reading through this forum for a while, and there seems to be a lot of guys who know their stuff on here!

Little issue with a Cyrus II and PSX, been using the amp for a while with a Rotel RCD975 and Rogers LS55s with no problems. Recently been given a Pro-ject debut which I hooked up tonight, made sure both the PSX and the amp were powered, and nothing. I know the turntable works but I can't get anything out of the amp on either the MM or MC phono inputs

I've heard the low voltage power suppy caps can fail on these, but I've been under the hood of the thing and they *look* ok... not swollen or peeling... I'm a little stuck... no crackles, just silence on both channels... any thoughts??

Gary.
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Old 30th August 2009, 08:02 AM   #2
jaycee is offline jaycee  United Kingdom
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My guess would have been that you weren't powering the amp up as well as the PSX , since as the PSX only runs the power amp stage and not the regulators that feed the phono stage, but you are

If you are experienced enough, measure the voltages at pins 4 and 8 on the NE5534 opamp in there.
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Old 30th August 2009, 01:32 PM   #3
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Thanks Jaycee, pulled the board out and the tracks under that same op-amp have parted company with the very discoloured looking PCB... Looking around the joints on the board its not the first one to have done so either, its been repaired a couple of times before, noticably under the output stage.

Its one of the very first models with the plastic case, and the PCB resembles the ones I used to build in college.... although I have to say mine were neater!

Think this ones going to be filed under "project" for while!

Gary.
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Old 30th August 2009, 04:01 PM   #4
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Thanks Jaycee, pulled the board out and the tracks under that same op-amp have parted company with the very discoloured looking PCB... Looking around the joints on the board its not the first one to have done so either, its been repaired a couple of times before, noticably under the output stage.

Its one of the very first models with the plastic case, and the PCB resembles the ones I used to build in college.... although I have to say mine were neater!

Think this ones going to be filed under "project" for while!

Gary.
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Old 30th August 2009, 04:07 PM   #5
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Sorry... I meant the LM337 vreg... misread your post a little there!
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Old 31st August 2009, 06:28 AM   #6
jaycee is offline jaycee  United Kingdom
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This is common when a fault occurs apparently. Change those caps, check the diodes feeding them too.
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