Hi Guys,
I got a dead E-MU Morpheus (digital rack mount synthesizer) and I'm trying to bring it back to life. It had a bad PSU but I bought a new one (those are still available on e-bay). Now I can turn the power on but it still doesn't work
I have also installed a new CR2330 battery with no effect. The LCD screens backlight turns on but there is nothing displayed (sometimes black boxes appear instead).
The failure mode is:
1. Without a battery on board - blank screen, all red LEDs are lit for couple of seconds and dim afterwards. After another 5 seconds some LED stay on but it doesn't respond to any key. Screen still blank.
2. With a battery installed - all LEDs except ENTER are off just after power up. Screen is blank.
3. When trying to boot in Diagnostic mode (either MASTER+Cursor Right or both Cursor keys) all LEDs are off right away. Screen is still blank.
I have checked the output voltage on PSU and it seems kinda right: +5V, +12V and -10V. I have also checked the voltage in some random places on the board and looks like that there is power distributed.
I have taken out all the ROM chips and cleaned them properly before re-installing. I also removed all the connector strips and cleaned them as well. I have exchanged all the capacitors on the main board and checked it with another display module (HD44780 based). Still dead as a dodo
Any ideas what else could be checked? I haven't found a service manual and I'm pretty sure it doesn't exist (at least online). Any suggestions on how to proceed would be highly appreciated. I have multimeter and oscilloscope in terms of measurement gear.
FoxxB.