hi to all forum member i need our help to set the dc ofset of treshold s450.
i have purchased it used but in a right channel i read 1,2v dc and left channer i read -1,3 volts dc.
i nned also the schema or servece manual to teterminare the trimmer that regulate it.
i wait soon our help
thanks at all in advance and exluce me to my little english
i am italian
alfonso
i have purchased it used but in a right channel i read 1,2v dc and left channer i read -1,3 volts dc.
i nned also the schema or servece manual to teterminare the trimmer that regulate it.
i wait soon our help
thanks at all in advance and exluce me to my little english
i am italian
alfonso
same pcture
hi i see in the driver card only a blu trimmer
but i have tried to regulate it bat the cd remail aroundo 1.1 volts dc
hi i see in the driver card only a blu trimmer
but i have tried to regulate it bat the cd remail aroundo 1.1 volts dc
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to help me to determine which iteration of front end you have in that amp,read to me type of that 6-legged small metal transistor (on first pic)
then I can try to find schematic to point you in right direction
however , what you'll certainly need is to do some maintenance - for what you need to make front end pcb accesible
when you make that ,take few frontal pictures of pcbs and post them - so we can see is there need for changing small electrolytics and anything else
btw. pot you have on pcb is for setting Iq - standing current
you have appropriate info (pdf file) for that here : Treshold Treasure ?? while Papa was there : 400A | Zen Mod Blog
but , prior to that , you need to solve offset issues
then I can try to find schematic to point you in right direction
however , what you'll certainly need is to do some maintenance - for what you need to make front end pcb accesible
when you make that ,take few frontal pictures of pcbs and post them - so we can see is there need for changing small electrolytics and anything else
btw. pot you have on pcb is for setting Iq - standing current
you have appropriate info (pdf file) for that here : Treshold Treasure ?? while Papa was there : 400A | Zen Mod Blog
but , prior to that , you need to solve offset issues
another information i dont know if is it possible to be usell about the problems
i have disconnect the power supplay 24 hors before, and when dismount the card on the 6 big power cap (33.000 UF) 5 was discharge and only one was still full chargeed.
i have disconnect the power supplay 24 hors before, and when dismount the card on the 6 big power cap (33.000 UF) 5 was discharge and only one was still full chargeed.
isn't that small transistor 2N5566 ?
however , while you're at it - replace those 2 electrolytics (1 per pcb)
take a gooooood look at solder side , re-flow any suspicious solder point
I'll dig adequate FE schematic later , maybe no before tonight
however , while you're at it - replace those 2 electrolytics (1 per pcb)
take a gooooood look at solder side , re-flow any suspicious solder point
I'll dig adequate FE schematic later , maybe no before tonight
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yes confirm is 2n5566 and after there is write d 8924
the electrolytics is that one orange (1 per pcb)?
the electrolytics is that one orange (1 per pcb)?
yup
and - replace that Tantalum cap - biggest yellow blob, right below CNY optocoupler , bellow trimpot
put any decent electrolytic there ,with same capacitance/voltage
and - replace that Tantalum cap - biggest yellow blob, right below CNY optocoupler , bellow trimpot
put any decent electrolytic there ,with same capacitance/voltage
yes , try
test conditions - no load at output , all inputs shorted (XLR pins 2 and 3 to pin1/gnd )
edit:
it'll be good to confirm voltages noted on schematic
test conditions - no load at output , all inputs shorted (XLR pins 2 and 3 to pin1/gnd )
edit:
it'll be good to confirm voltages noted on schematic
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i can substitute the 10v 220uf with 35v 220uF (i have this new at home) or have to purchase it.
should be the same.
i wait your confirm
should be the same.
i wait your confirm
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