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Old 15th April 2012, 06:55 PM   #21
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Did you check the voltages with the voltmeter in AC? This check would tell you if you have bad capacitors in the power supplies.
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Old 15th April 2012, 06:58 PM   #22
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But on the out pin on vr2 is reading 7.5, what should I do? Replace? And could this be the cause of my problem?
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Old 15th April 2012, 07:15 PM   #23
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Cyrus Two | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine
if you download the service manual (en) from the above link, it clearly states what you should do..... and how to proceed.
edit: page 10
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Old 15th April 2012, 08:17 PM   #24
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I have looked and cannot understand. I do know that the said transistor vr2 is reading 7.5v on the output pin. Is this transistor faulty?? I have checked output on ac and readings were on vr1 /vr2 output pins and they are both reading 0.4mv ac???
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Old 15th April 2012, 08:53 PM   #25
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vr2 is an voltregulator. so output should be 18 vdc. if its not then most likely its broken.
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Old 15th April 2012, 10:07 PM   #26
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Im not sure about this but if the voltage regulator (vr2) is showing 7.5v on the output pin well isnt something else at fault thats why it giving that voltage??
Im not sure at all if this is correct but what other components could be making the voltage drop?
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Old 15th April 2012, 10:14 PM   #27
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Check what voltage is actually powering the amp. Put black probe on black speaker output socket and red probe on the end of D5 with the white line, note the voltage reading. Now move the red probe to the end of D7 opposite the white line, note the voltage reading.
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Old 15th April 2012, 10:48 PM   #28
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hi richie,
yes i have done this and they are both reading 39v and same on the other channel.
I have also checked
d17 d18 they are reading 1.1 m ohms, and rising slowley
d19 d20 they are reading 450.k ohms, and rising quite fast
these are the same should these not read the same..

Its driving me bonkers! But i love it!!
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Old 16th April 2012, 04:59 AM   #29
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disconnect the amplifiermains, meassure R13 R14 they should be the same. then R15-R16 also the same. this resistors controll the vr1 vr2.
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Old 16th April 2012, 05:50 AM   #30
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Another check that you can do with the amplifier tuner off is to read the resistance of the Vr2 + and the Vr1- to ground. Both resistance should read close. Ii you have a low resistance in the VR2+ means something it is loading it. If both are close then you may have a bad voltage regulator.
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