Hello dear diyers, I'm refreshing an older Pioneer integrated amp and would like to have the service manual for it. Unfortunately the usual search just gave me the additional service manual for the HE/HB variants of the amp. The main document, the SA-510/KU service manual (ART-479) seems to be unavailable to me. And my hifi-engine account is deactivated, without the option of renewal it seems.
Can anyone be so kind to provide me with the aformentioned service manual?
Cheers
Johannes
Can anyone be so kind to provide me with the aformentioned service manual?
Cheers
Johannes
What is wrong with the HE/HB variant of the manual? Surely it's only the power supply transformer section that might differ some?
@arjen6t8 The additional SM for the HE/HB variant does not cover the common adjustment procedures. It only refers to the different power supply configuration (fuse holder).
@xXBrunoXx Thank you, but the schematic is alreday included in the additional SM that I have. Although the resolution is not optimal, it helps.
Anybody still active on hifiengine and able to download the SM that is linked there?
@xXBrunoXx Thank you, but the schematic is alreday included in the additional SM that I have. Although the resolution is not optimal, it helps.
Anybody still active on hifiengine and able to download the SM that is linked there?
The only adjustment I can see is the bias current? D. Self in one of his books gives for an EF output stage with 0R22 emitter resistors an optimal bias current of 107 mA, or 46,2 mV measured across both emitter resistors. Does that help?
Hi arjen6t8, thanks for the confirmation. That was my intention also. To give the output stage about 100mA idle current. At the moment the left channel reads 5mV, right channel 6mV across both 0,22R. Power supply voltages read fine at 30V each rail. Of course I set the fuse to the 240VAC position. I'm having mostly 235VAC mains in the house.
I was just wondering what could alter the idle current so significantly downwards over time or if the service manual would suggest only 10-15mA idle current. I'm sure the thin aluminum bar, on which the four output transistors sit, would get pretty hot at 12W dissipation. But now there is no noticable rise in temperature with less than 2W idle power dissipated.
I was just wondering what could alter the idle current so significantly downwards over time or if the service manual would suggest only 10-15mA idle current. I'm sure the thin aluminum bar, on which the four output transistors sit, would get pretty hot at 12W dissipation. But now there is no noticable rise in temperature with less than 2W idle power dissipated.
I'd expect to see a quiescent current value of up to 10 mA for that type of amplifier.
There is no factory recommendation, so you can adjust the current to be as high as you deem acceptable, considering the amount of heat dissipated in the worst scenario (an amp inside the cabinet or another piece of hifi gear placed on top of the amp, on a hot summer day).
You will not hear the difference between 5-10mA and 100mA.
There is no factory recommendation, so you can adjust the current to be as high as you deem acceptable, considering the amount of heat dissipated in the worst scenario (an amp inside the cabinet or another piece of hifi gear placed on top of the amp, on a hot summer day).
You will not hear the difference between 5-10mA and 100mA.
From the service manual of the SA-610 it seems that both are very similar. I'll cut the jumpers for increasing bias and see where it will land.
Thank you all... I think the topic is closed 👍
Thank you all... I think the topic is closed 👍