Hi All,
This is my first post but I've researched this topic quite a bit and haven't found much info directly related to this machine - hoping the answers to this can help others as well as myself in solving this [and related] issue. I have a couple questions that actually encompass different topics but I'll try to consolidate them here as they are all fairly related.
Since I'm new I can't post a link to the schematics but you can find it here:
www (dot) studio250.fr/docs/divers%20enregistrement/atspecif.pdf
The Problem
So I have one of these amazing RMX 64 4-tracks but a couple channels do not appear to be passing signal properly. Channel 1 works perfectly as it should and I am getting full sound from both the Sub1 out and Direct channel out. Channel 2 does not pass the signal properly although I can just barely hear the signal thru the sub 1 out and direct out when I crank up the input gain/trim to the max; this issue is present for channel 6 as well.
When I first noticed this problem I found that when I firmly pressed down on the channels the signal would return but after releasing the pressure the signal would cut out again. Naturally I thought this may be some sort of connection issue and cleaned all pin connectors that attach to the mother units - this did not solve the issue. I recently purchased another rmx 64 for parts and it seems to be working fine as just a mixer (tape transport does not work) so I replaced the channels but the issue was still present. I even switched out the mother unit for the mix channels and the issue still persists. I am wondering if this may be a problem with eletrolytic caps in the pregain stage?
I am still very new to DIY audio repairs and electronics in general although I have a good grasp of basic signal flow and circuits.
Testing equipment (slightly different topic)
Currently all I own to analyze the issue is a multimeter, speakers and my ears.
From what I have read it is recommended that I purchase a tone generator and an audio analyzer capable of multitone signal generation. I am a musician by trade and my goal is ultimately to be able to accurately identify issues with my vintage audio gear and make repairs for fairly common issues - I am not looking to purchase a super fancy oscilloscope or audio analyzer for mucho $$$ at this time and would like some recommendations on what would be good to start with; I was thinking about a Whirlwind QBox but I am not sure how far that would get me, although it seems like it would help in this case.
Is this an issue I can probably solve given my basic tools on hand? I would imagine that I'd just need a tone generator and then follow the signal via multimeter thru the channels and see where the signal becomes lossy/cuts out to identify the problem component. If this is the case, would I just be poking around along the signal path looking for a 1khz tone with my multimeter? As I said I am very new to this so I am not sure how I'd go about all this.
Thank you all so much!
This is my first post but I've researched this topic quite a bit and haven't found much info directly related to this machine - hoping the answers to this can help others as well as myself in solving this [and related] issue. I have a couple questions that actually encompass different topics but I'll try to consolidate them here as they are all fairly related.
Since I'm new I can't post a link to the schematics but you can find it here:
www (dot) studio250.fr/docs/divers%20enregistrement/atspecif.pdf
The Problem
So I have one of these amazing RMX 64 4-tracks but a couple channels do not appear to be passing signal properly. Channel 1 works perfectly as it should and I am getting full sound from both the Sub1 out and Direct channel out. Channel 2 does not pass the signal properly although I can just barely hear the signal thru the sub 1 out and direct out when I crank up the input gain/trim to the max; this issue is present for channel 6 as well.
When I first noticed this problem I found that when I firmly pressed down on the channels the signal would return but after releasing the pressure the signal would cut out again. Naturally I thought this may be some sort of connection issue and cleaned all pin connectors that attach to the mother units - this did not solve the issue. I recently purchased another rmx 64 for parts and it seems to be working fine as just a mixer (tape transport does not work) so I replaced the channels but the issue was still present. I even switched out the mother unit for the mix channels and the issue still persists. I am wondering if this may be a problem with eletrolytic caps in the pregain stage?
I am still very new to DIY audio repairs and electronics in general although I have a good grasp of basic signal flow and circuits.
Testing equipment (slightly different topic)
Currently all I own to analyze the issue is a multimeter, speakers and my ears.
From what I have read it is recommended that I purchase a tone generator and an audio analyzer capable of multitone signal generation. I am a musician by trade and my goal is ultimately to be able to accurately identify issues with my vintage audio gear and make repairs for fairly common issues - I am not looking to purchase a super fancy oscilloscope or audio analyzer for mucho $$$ at this time and would like some recommendations on what would be good to start with; I was thinking about a Whirlwind QBox but I am not sure how far that would get me, although it seems like it would help in this case.
Is this an issue I can probably solve given my basic tools on hand? I would imagine that I'd just need a tone generator and then follow the signal via multimeter thru the channels and see where the signal becomes lossy/cuts out to identify the problem component. If this is the case, would I just be poking around along the signal path looking for a 1khz tone with my multimeter? As I said I am very new to this so I am not sure how I'd go about all this.
Thank you all so much!