Emax

Ok, at first i want to sorry for my english... its not best but i will try do my best to explain my problem.

What i did:

Im not first user of emax but before it went to closet for years it worked. I never looked inside till week ago. First look and you can recognize modifications in power supply and floppy drive. It didnt even turn on. I went to best electronic engineer around and he fixed power supply... it works. I did every diagnostic test with 3.2 OS version. Everything seems to work perfect... except outputs. When im booting from MUST disk (im not sure if i made the disk right) at first sampler booting... and after about 10 secs the display become empty and only analog processing led is on. When i plug headphones into Left/Stereo output, every time im turning on emax i hear weird sound, kind of spaceship fx for about 3 seconds and it fade out but thats the only sign of life from outputs...

What i can:

Ive got access to very good electonic engineer.

I can make high resolution pictures of unit

I just need direction where to start and what possibilities ive got.

It sounds promising...

for OS disk i used file available in file section. Its 3.2 version. DD floppy disk and EMXP on Win XP with internal floppy drive. I used omniflop to format floppy to 720 kb, then again in EMXP for EMAX I format with OS installation.. everything went fine without errors.

When im booting emax from that disk ive got message "bad bank on disk" but i thought maybe its just the OS without the banks on it, thats why i get the message. OS doesnt make any problems with loading presets from other disks or while sampling sound directly to emax ram memory.

Ok, I added Grand Piano bank to OS disk... System is loading correctly, bank too. Ive got about 30 presets to choose but when im loading any there is no sound. I checked special menu for disabled channels and there is no disabled ones. I recalibrate volume slider so im sure lowest value is the lowest and highest is the highest. Im checking my outputs with Audiotechnica headphones ATH-M40fs through all outputs and nothing. Keyboard sending midi notes as well. When im loading sequences from that Grand Piano bank and pressing play there is no sound. When im plugging 1/4 TRS Connector of headphones to the outputs i hear characteristic sound crackles (like in other vintage audio gear). What can i say more... floppy drive is not original one.

Thank you very much Jammie for your advices.

Yes, im sure that one has sequences... i pressed select button on sequencer side from front panel and there was a pretty long list.

External midi keyboard was my first idea yesterday. I connected ASR10 midi out with EMAX midi in and EMAX recived midi correctly but there was no sound.

Ok, Ive got my old friend in parts. I think its good moment to cleanup whole machine. I used isopropyl alcohol and tooth brush on pins and pins connectors... im little scared to unplug the flat connector of ribon cable next to E-Chip because im not sure if its possibe to take out.. What can i do more ? I used compressed air to whole field of the pcb's but its still kind of old dust on it... and a lot on the back sides (without chips) of PCB';s. Im not sure how can i clean them up. If any one got proven methods to share how to clean up elements of unit, I'll be grateful (front panel, keys, pcbs).

If i want to check pcb's with oscilloscope do i need to take to engineer whole unit or boards only?

Im mad at myself i never lick electonics knowledge in my life, i opended a lot of gear and pc's and macs... but never had soldering iron in my hand :( i feel like blind right now. From today its over.

Thank you again, i really appreciate your help.