I’m experiencing a strange issue where my MB-6582 comes up from a cold start and instantly begins cloning it’s cores, without me holding down the menu button.
Then, once booted, it drops into the oscillator config page and freezes there, completely unresponsive to any buttons or knobs.
I assume it’s a bad connection or short somewhere in the core1 and/or control surface signal path, so here’s what I’ve tried so far:
> completely removed the ICs from U16 - U23 in case they were causing whacky feedback, but no change
> exhaustively searched for shorts and bad solder joints all around U1_CORE1 (all seems OK)
> multimeter continuity and resistance testing for each socket pin, above and below the base PCB (all continuity seems OK, with resistance levels between .2 -.3 ohms on each pin)
> multimeter testing for each core1 component:
| | Designator | Description | Component type used | Notes |
| | C1_CORE1 | Capacitor - MLCC | 33pF | OK |
| | C2_CORE1 | Capacitor - MLCC | 33pF | OK |
| | C3_CORE1 | Capacitor - MLCC | 100nF | OK |
| | D1_CORE1 | Diode | 1N4148 | OK |
| | Q1_CORE1 | Crystal | 10MHz | 10 Mhz, confirmed with Oscilloscope |
| | R1_CORE1 | Resistor | 100 Ohm 1/4W 1% | OK |
| | R10_CORE1 | Resistor | 10K 1/4W 1% | OK |
| | R12_CORE1 | Resistor | 1K 1/4W 1% | OK |
| | R2_CORE1 | Resistor | 1K 1/4W 1% | OK |
| | R6_CORE1 | Resistor | 1.2K 1/4 1% | Reads @ 299 Ohms from each core |
| | R9_CORE1 | Resistor | 10K 1/4W 1% | OK |
Appreciate any suggestions or guidance..
Cheers
