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Old 16th November 2005, 01:52 AM   #1
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Cool pioneer sa9500II AMPS

HI,can anyone help me to fix my pioneer sa-9500IIamp?..i know its old,,,but it works,,,except if i go near the wires ie:mains wire,,it switches off...and makes a very unhealthy noise from the plug..
i see theres 2 ground outputs on back,,,where are they supposed to be goin to...is it into the plug(the neutral bit)....?
at the mo,,theres one wire comin from the right groundin thing on the amp..and goin into the plug,,,middle bit,,,is this right,,,i think this is probably wrong ,,,but want to be sure before i do anythin,,,please help...im only used to the usual 3 wires goin into the plug....and colour coded as well as all comin from the same line out.
:xeye: ....hope its a simple as i feel right now,,,hehe..
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Old 16th November 2005, 02:43 PM   #2
anatech is offline anatech  Canada
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Hi djmaiden,
Welcome to Diyaudio!
Luckily it sounds like broken connections in your AC plug. I am completely unfamiliar with UK standards but I'll suggest something.

Sometimes there is a fuse in the plug. Check to see if the contacts or any connections are loose. You may see some arc marks, or just black marks where this is happening.

-Chris
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Old 17th November 2005, 06:26 AM   #3
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Default pioneer sa95oo amp

hi there,thanks for your reply.
i did check inside the plug and it all looks ok except im not familiar with there being a seperate grounding wire comin from the back of the amp.usually here all 3 wires are together in the same lead and just go into the plug as usual..ie:blue /left...brown/right and green/middle(neutral or earth as its called)...but......on this amp...the mains lead has only 2 wires ,,,and inside the plug ,,,one is to the left and one to the right,,,but theres no coulour in the wires here....and then theres 2 grounding connectors on back of amp...left one and a right one,,,and at moment,,,theres only 1 wire comin from the right one which is connected to the middle(earth) part inside plug....thats why i was wondering if this could be whats causing the problem,,,,should there be a wire coming from both left and right grounding outputs from the amp...into the plug,,both joining in the earth connection or what....?please let me know if you know more from this,,,or can find out somehow...thanks,nicole
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Old 17th November 2005, 12:13 PM   #4
anatech is offline anatech  Canada
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Hi Nicole,
That is a question someone who knows the UK electrical codes will have to answer.

A wire may be broken in the cord, just behind the plug. Just a thought.

-Chris
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Old 18th November 2005, 10:37 PM   #5
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Default sa9500 amp

yea i see what you are sayin but its a us amp anyway and its old....
iv never seen a two wired mains lead before....what does this mean or suggest,and if you cont know about this can you direct me to someone who does asap as i need to get it sorted,ive never used these forums....am usually too busy,and just need some answers from someone who knows....any ideas please let me know ,thanks,
nicole 8 )
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Old 19th November 2005, 12:26 AM   #6
anatech is offline anatech  Canada
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Hi Nicole,
US amp in UK. You still need a UK electrical guy.

Try a post about UK mains help or something. Unless someone knows and sees this thread.

-Chris
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Old 19th November 2005, 12:34 AM   #7
dce is offline dce  United States
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Default pioneer

nicole,

if you can find a service manual for that model
it would be better. I have one before but I can't find it.
I worked on some of those but not related on ac wirings.
I will still try to look for my manual.

dce
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Old 19th November 2005, 12:43 AM   #8
Variac is offline Variac  United States
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Some of the things you have mentioned seem very strange to me, which might be because I am in the US!

I wonder how the amp is working on UK 220 volt mains if it is a US spec model? Pioneer stuff is from Japan, and a US version would need a transformer to work on 220 volts. Some old equipment in the US didn't have grounds which would be dangerous with 220 mains.

The grounds you mention seem really unusual also. I hope the ground connection you are using isn't the one meant to be hooked to the phono turntable!!

The best idea I have is for you to post a photo of the entire back of it where the wires are. It is a pain to do because the photo files have to be pretty small in size. Use the lowest resolution of your camera and it might work...or you could e-mail it to me and I could prep it for posting.
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Old 19th November 2005, 01:00 PM   #9
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Default pioneer sa9500II earthing????

hi variac,

unfortunately i cant get a picture of the back of the amp right now,
but theres a round voltage selector which is currently set to 240 v
(not 220)....it has a screw in middle presumably so you can alter it if necessary...so i dont think this is a problem...as uk mains is usually
240v.
however what you were saying about the grounds terminals is strange ...i agree...that is what im trying to ascertain.
i think these two grounds terminals on the back are meant for turntables or something(cant see why else they would be there),
but....when i got the amp,i saw that one of these terminals was being used to connect into the ac plug with a thin wire....and at the time as i didnt know....i presumed this was for a good reason...; /
however,seeing that the amp is not working properly....and it always cuts off when i touch the mains lead near the plug...i think this may be the cause of some of ...if not all the problem here.


so my main question is should this amp have a normal 3 wired mains lead????....ie with an earth connection....
or is it ok with just the two wired lead it has on it now?
and should i then try it with just the two wired lead connected,and take out this silly piece of wire which is comin from one of the grounds terminals goin to the earth in the mains lead???
hope this makes it clearer...as im dying to try this ...but simply wanted to find out what was goin on with this 2 wired mains lead......as its an old amp....is it earthed internally or something....?......it must of been done differently then as this is def thr orig mains lead as it has 1977!!!!!! printed on the wire....haha.

nicole
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Old 19th November 2005, 01:13 PM   #10
Netlist is offline Netlist  Belgium
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Nicole,
Here's a picture of different plugs. Can you select one to help us understand? Don't touch the voltage selector, it's fine at 240V.

/Hugo
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File Type: jpg mvc-418f.jpg (37.6 KB, 79 views)
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