New Member MPC3000 RF type interferance HELP

I've had a hard time trying to follow the writing of the OP. To me it seems like we are missing a part of the story, so I've broken it down a little bit.

OP, it may help those trying to respond to you if you can put some effort in to type in proper sentences instead of a large glob of text.

3000 wrote:the first night i used it i was at a friends house and didnt have any problem with it.

So, at one point of time this MPC was working properly?

3000 wrote:first off im pretty sure ive blown the scsi fuse already so I'm using floppys which isnt the end of the worod.

How exactly did you "blow" the SCSI fuse?

What did you do to blow the fuse?

How did you determine the fuse was blown?

Normally the fuse is blown when a SCSI drive is removed while the power is still on. This fuse may not protect the machine if you plug a non-SCSI device into this port as the fuse only protects the termination power line.

What device did you plug into the machine?

3000 wrote: So day one my scsi board is out ajd day 2 I'm getting some odd short wave radio tuning sci-fi noise that is originating in the audio inputs of the mpc.

What else have you done to the MPC before this? At this point, have you already opened up the machine and looked inside?

It is possible to damage the PCBs and components if the cover is not put back on properly. You may have inadvertently damaged something. Are there any components damaged? Look for twisted, bent or broken components.

Did you plug the leads from the Main Volume and Record Volume PCBs back into the proper spots?

clint246clint wrote:That sounds pretty bad, if you changed the RAM and it's still same you might wanna consider bailing out and getting a refund. Where did you get that machine, and did you get to test it first or what?

I tested it and it sampled fine before i bought it.also it worked fine at my friends house right after. But remeber i blew the scsi term power fuse withvmy zip drive there so I'm thinking its related because after that the next time i tried to use it was at home amd it sounded like what u hear in the vid. I'm thinking it os some kind of ground/electrical interference but from the location of the blown fuse if thats possible. maybe its semi blown or something and creating a wierd power interference. I'm going to look back at it and see if i can disconnect the scsi port board (or is it on the motherboard itself?). Ill see if i can do that as soon as i get home and update u guys. oh and it was a used private sale purchase so there is no returning it im screwed.

Mpchunter, i post from my phone, ill answer your post when i get off work and to a computer.

3000 wrote:Ok I'm screwed, just pulled the ram again but this time tested with it out i couldnt stand to wait. Sure enough the sound is still there while the ram is out. and i also noticed it was making static and the noise even when i wasnt hitting a pad or had anything sampled. just opening the audio inputs preparing to sample you can hear it but its kot all the time it does that so its been fooling me. its definitely inside the mpc i dont think its interference . Unless amybody here recognizes this sound and has a miricle cure i just lost over a grand FAST. I'm going to have to shelf it until i can send it out for repairs. might just buy another one.. thanks to all that helped out.

Have you removed the stock RAM board?

Have you disconnected it from everything else except the power, listened through headphones, and does the sound still happen when you go to record a sample?

SimonInAustralia wrote:

3000 wrote:Ok I'm screwed, just pulled the ram again but this time tested with it out i couldnt stand to wait. Sure enough the sound is still there while the ram is out. and i also noticed it was making static and the noise even when i wasnt hitting a pad or had anything sampled. just opening the audio inputs preparing to sample you can hear it but its kot all the time it does that so its been fooling me. its definitely inside the mpc i dont think its interference . Unless amybody here recognizes this sound and has a miricle cure i just lost over a grand FAST. I'm going to have to shelf it until i can send it out for repairs. might just buy another one.. thanks to all that helped out.

Have you removed the stock RAM board?

Have you disconnected it from everything else except the power, listened through headphones, and does the sound still happen when you go to record a sample?

You must have been reading my mind! I was just going to ask that about the stock ram. Where is it? What does it look like? And how do i remove it? Also is it ok to test the stock ram out but with the upgrade ram in?

I did test last night with the scsi board unhooked from the inside but i gotthe same result. will try the stock ram next.

3000 wrote:You must have been reading my mind! I was just going to ask that about the stock ram. Where is it? What does it look like? And how do i remove it? Also is it ok to test the stock ram out but with the upgrade ram in?

I did test last night with the scsi board unhooked from the inside but i gotthe same result. will try the stock ram next.

It is a small daughterboard that plugs into the side of the main circuitboard, just to the right of where the 2 expanded SIMM memory boards slot in.

Do a search on here, has been discussed, with photos, previously.

SimonInAustralia wrote:

3000 wrote:You must have been reading my mind! I was just going to ask that about the stock ram. Where is it? What does it look like? And how do i remove it? Also is it ok to test the stock ram out but with the upgrade ram in?

I did test last night with the scsi board unhooked from the inside but i gotthe same result. will try the stock ram next.

It is a small daughterboard that plugs into the side of the main circuitboard, just to the right of where the 2 expanded SIMM memory boards slot in.

Do a search on here, has been discussed, with photos, previously.

Update. didnt have time past night to work on it but i did spot the stock ram board, its still installed. I then tried to verify how much upgraded ram had been put in between the other 2 expandable ram chips but couldnt find any identafiable markings. just numbers. i google searched them but found nothing. one of the numbers on themvi remember was xmo684 i think.

where in the mpc can i check for ram or sample time to tryto verify it has 32mb?

Hopefully seeing the stock ram board is a good sign. maybe this will all stop after i remove it.

Hey sorry for the late response.
For me, the sound problem was not constant. Cause there was a loose connection... So sometimes the bad sound was there, and sometimes not.
You should definitely remove the ram board, but I doubt that this is the cause...
And to check your ram, go into sampling mode, and just dial in something like 500 or something in the Length. If you have 189,3s in stereo, than you got the 32mb.
Sorry to hear all these problems. I know the feeling^^ Maybe you can give Forat a call and explain it to him. Heard that he was a helpfull dude.
I called a well known service in germany, and the man told me right away the right thing...


Greetings

Sorry for the delay. i removed the stock ram board but its still making the noise. It will surely be going to forat. ill let you all know what the problem turns out to be when its fixed. I WANT to leave this thread as a resource for anybody with the same problem in the future.