Hello,
I have a Soundstream Rubicon805, unfortunately not used for years but it works when I put it away. Now I build a new system in a car and want to use this really good amp, but it doesn't work.
It turn on, power led is on (red) but there is no music, all channels are dead. The positions of the switches doesn't change anything.
So I opend it, threre are no visible damages.
I tried to test the switches, those I could measure are O.K.
If I power it on there are +30/-30 V , so everything seems to be fine.
I would be happy for every suggestion to get this thing work.
I coudn't find the schematic's for this amp, I only have this for the 705 but there is a lot of difference in the layout.
I have a Soundstream Rubicon805, unfortunately not used for years but it works when I put it away. Now I build a new system in a car and want to use this really good amp, but it doesn't work.
It turn on, power led is on (red) but there is no music, all channels are dead. The positions of the switches doesn't change anything.
So I opend it, threre are no visible damages.
I tried to test the switches, those I could measure are O.K.
If I power it on there are +30/-30 V , so everything seems to be fine.
I would be happy for every suggestion to get this thing work.
I coudn't find the schematic's for this amp, I only have this for the 705 but there is a lot of difference in the layout.
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You stated that the amp has not been used for years.
The internal mechanics of the switches could be corroded over years.
Try to spray some isopropyl alcohol (I use clean 99.9%) in the switches and give it a good wiggle.
I suspect this is the problem.
The internal mechanics of the switches could be corroded over years.
Try to spray some isopropyl alcohol (I use clean 99.9%) in the switches and give it a good wiggle.
I suspect this is the problem.
Thank you for your suggestion.
I tested all switches with my multimeter and they are O.K. Any further things I could do ?
I tested all switches with my multimeter and they are O.K. Any further things I could do ?
I've not seen a Rubi 805, but if they are anything like the Reference 405 or 705, make sure you are using the correct RCA input AND switch combination per channel. Theres like 3~4 redirect switches in some of these that may be confusing you. On the board the RCA select switches may be labeled; Local or Remote. Switch them all to Local. That puts the channels at 1-to-1 in-to-out.
Do you have rail voltage? Regulated voltage (+/- about 16vDC)? Any DC on speaker terminals?
I say SWITCHES. Are you measuring 0-ohms across selected terminals with your meter on the ones you've checked Even 5-ohms is no good. Needs to be at or near 0. Have you removed the board from the sync and measured ALL the switches? A 705 would probably have about 10 switches in it.
Do you have rail voltage? Regulated voltage (+/- about 16vDC)? Any DC on speaker terminals?
I say SWITCHES. Are you measuring 0-ohms across selected terminals with your meter on the ones you've checked Even 5-ohms is no good. Needs to be at or near 0. Have you removed the board from the sync and measured ALL the switches? A 705 would probably have about 10 switches in it.
The switches are in correct position, but I tried some other position with other input, without filter etc. I think I understand what is to do.
I have a 705 too, and there are the switches on the other side, so you have to remove the board to make the measurements because ist not possible to reach all contacts. The 805 has most of the switches on the side where the transistors are, so ist possible to measure them without removing the board.
And yes they show nearly zero ohm, badest 0,1 ohm .
I checked DC offset at the speaker terminal max . 0.2 V
Rail voltage is there +/- 30 V
I have a 705 too, and there are the switches on the other side, so you have to remove the board to make the measurements because ist not possible to reach all contacts. The 805 has most of the switches on the side where the transistors are, so ist possible to measure them without removing the board.
And yes they show nearly zero ohm, badest 0,1 ohm .
I checked DC offset at the speaker terminal max . 0.2 V
Rail voltage is there +/- 30 V
Attachments
opamps get +/-15V
I dont't understand what's the problem
Is there a kind of protection that is activated ? The amp has no led for protection or other problems, but it is strange that every channel are quiet, it must be something that mutes the whole amp.
I dont't understand what's the problem
Is there a kind of protection that is activated ? The amp has no led for protection or other problems, but it is strange that every channel are quiet, it must be something that mutes the whole amp.
I didn't see this because it wasn't in bold print due to you being new here.
If you drive a strong signal into the amp, do you see audio on any terminals of the audio driver boards?
If you drive a strong signal into the amp, do you see audio on any terminals of the audio driver boards?
I'm happy for every support I get. So no problem. If I post something it is checked by moderator, so this needs some time too.
Audio driver boards, are this the small daughter boards (5x) ? They have a lot of pins, where shoud be the signal ?
Do you have the schematics of the amp ? It woud be helpfull to see the routing of the signal path.
Audio driver boards, are this the small daughter boards (5x) ? They have a lot of pins, where shoud be the signal ?
Do you have the schematics of the amp ? It woud be helpfull to see the routing of the signal path.
