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MB-6582 Clones Cores at Startup, with No Buttons Pressed?


dwestbury
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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. 

 

IMG_1288.jpeg

 

IMG_1290.jpeg

 

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

 

Edited by dwestbury
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19 hours ago, Noise-Generator said:

Well this is he third issue I also had but forget how to solved this ;)

But I'm kind of sure it was a short - located at the bankstick area and connections.

Appreciate the general guidance...

I haven't looked at this in a few days, but will hover around the banksticks later this week.

 

Cheers,

-Darrell

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