[sdiy] help with uQ repair

[Peter Pearson]

If memory serves, they're similar enough to help you get orientated.  You
should still check the other supply rails.

On Thu, Feb 23, 2017 at 12:01 PM, Julian Schmidt <elfenjunge at gmx.net> wrote:

> I'm afraid thats for the microWAVE not the microQ.
>
> But thanks nonetheless.
>
> julian
>
>
> Am 23.02.2017 um 17:31 schrieb Peter Pearson:
>
> Check +/- 12V https://elektrotanya.com/waldorf_microwave.pdf/download.html
>
> On Thu, Feb 23, 2017 at 11:30 Peter Pearson <electrocontinuo at gmail.com>
> wrote:
>
>> Check +/- 12V
>>
>> On Thu, Feb 23, 2017 at 11:29 Terry Shultz <thx1138 at earthlink.net> wrote:
>>
>> Hi All,
>>
>> On another note , if this is a DSPB56362 device, then Waldorf wold not
>> have put any of their code into this device.
>>
>> I do not recall Motorola doing a custom DSPx56362 for Waldorf as the
>> volumes used would not support the mask charges.
>>
>> http://www.nxp.com/assets/documents/data/en/data-sheets/DSP56362.pdf
>>
>> regards,
>>
>> Terry
>>
>>
>> On Feb 23, 2017, at 8:13 AM, Peter Pearson <electrocontinuo at gmail.com>
>> wrote:
>>
>> Check the supply means check all the supplies. Do you have all the other
>> rails and reference voltages? The service manual is online and you could
>> check that for resets etc. You should also consider contacting Waldorf for
>> advice.
>>
>> On Thu, Feb 23, 2017 at 10:46 Julian Schmidt <elfenjunge at gmx.net> wrote:
>>
>> yeah but these are ROM not RAM.
>> The datasheet says "These ROMs may be factory programmed with data or
>> programs provided by the application developer."
>>
>> No idea if waldorf went all the way to burn a custom loader into these
>> ROMs at the chip factory.
>> At least the normal firmware should be located on the flash, otherwise
>> you could not update it.
>>
>> julian
>>
>>
>> Am 23.02.2017 um 16:39 schrieb Terry Shultz:
>>
>> Hello All,
>>
>> The DSP56362 Motorola DSP does have P, X, and Y memory
>>
>> On-Chip Memories
>> — Modified Harvard architecture allows simultaneous access to program and
>> data memories — 30720 x 24-bit on-chip program ROM1 (disabled in 16-bit
>> compatibility mode)
>> — 6144 x 24-bit on-chip X-data ROM1
>> — 6144 x 24-bit on-chip Y-data ROM1
>> — Program RAM, instruction cache, X data RAM, and Y data RAM sizes are
>> programmable
>>
>> Instruction Cache
>>
>> Disabled Enabled Disabled Enabled
>>
>> Switch Mode
>>
>> Disabled Disabled Enabled Enabled
>>
>> Program RAM Size
>>
>> 3072 × 24-bit 2048 × 24-bit 5120 × 24-bit 4096 × 24-bit
>>
>> Instruction Cache Size
>>
>> 0
>> 1024 × 24-bit 0
>> 1024 × 24-bit
>>
>> X Data RAM Size
>>
>> 5632 × 24-bit 5632 × 24-bit 5632 × 24-bit 5632 × 24-bit
>>
>> Y Data RAM Size
>>
>> 5632 × 24-bit 5632 × 24-bit 3584 × 24-bit 3584 × 24-bit
>> [image: page4image15160] [image: page4image15320]
>>
>> 1.
>>
>> — 192 x 24-bit bootstrap ROM (disabled in sixteen-bit compatibility mode)
>>
>>
>>    -
>>
>>    Off-Chip Memory Expansion
>>    -
>>
>>       —  Datamemoryexpansionto256Kx24-bitwordmemoryforP,X,andYmemoryusingSRAM.
>>
>>       -
>>
>>       —  Datamemoryexpansionto16Mx24-bitwordmemoryforP,X,andYmemoryusingDRAM.
>>
>>       -
>>
>>       —  Externalmemoryexpansionport(twenty-
>>       fourdatapinsforhighspeedexternalmemoryaccessallowing for a large
>>       number of external accesses per sample)
>>
>>
>>    -
>>       -
>>
>>       —  Chip select logic for glueless interface to SRAMs
>>       -
>>
>>       —  On-chip DRAM controller for glueless interface to DRAMs
>>
>>
>>       regards,
>>
>>
>>       Terry
>>
>> On Feb 23, 2017, at 7:17 AM, Julian Schmidt <elfenjunge at gmx.net> wrote:
>>
>> I checked the 3.3V supply and it delivers stable 3.3V
>> Xtal is running at 14.3MHz and the Clock IC is forwarding the clock to
>> the DSP
>>
>> I only worked with SHARC DSPs so far, but I guess the motorola DSP has no
>> internal program memory and is bootet by the uC from flash and has its OS
>> stored in the attached SRAM?
>>
>> The rest of the PCB, especially around the DSPs looks pretty good. All
>> sketchy looking parts where located to the left of the uC and the DSP is on
>> its right side. Caps look good, too.
>>
>> Here is a pic of the board.
>> http://chipmusik.de/dump/uQ.jpg
>>
>> I'm a bit concerned that the firmware update does not seem to work, as I
>> guess the DSP should not be involved with that.
>> Maybe an indication that it could be the flash indeed?
>>
>> Any idea how to check the flash?
>>
>> Julian
>>
>> Am 23.02.2017 um 15:56 schrieb Christian Tecl:
>>
>> Hello list - hello Julian....
>> I guess you already checked everything round that flip flop, resistors,
>> diodes etc... To me there are also reasons to suggest a problem with power
>> supply, maybe you check that also before soldering that dsp... And think
>> about the possibility that it could be the flash, also. Like to hear what
>> you are discovering. Greets Christian
>> --
>> Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail
>> gesendet.
>> Am 23.02.2017, 15:24, Julian Schmidt <elfenjunge at gmx.net>
>> <elfenjunge at gmx.net> schrieb:
>>
>> I have a broken microQ in the workshop right now.
>> It arrived with a scrambled LCD that only showed garbage.
>>
>> after opening it up I saw someone butcher the D-Flipflop (bend and
>> shorted pins)
>> after replacing it the unit boots again, waldorf welcome screen, os2.2,
>> then preset name.
>>
>> yay!
>>
>> bad news is the unit immediately freezes. No buttons and encoders do
>> something. :(
>>
>> I tried the firmware update but on reveiving the sysex data the power
>> button makes a quick flash, 4 or 5 vertical bars appear in the LCD and
>> then nothing happens. Pingpong chaselight on the Inst. 1-4 LEDs and the
>> message "please play back dump" or something like that in the screen.
>>
>> In factory test mode all buttons, LEDs and encoders work.
>> Audio out test does not work (silence on all outs)
>> and the DSP test fails.
>> it only shows:
>>
>> 1:----- 2:----- 3:sig!
>>
>> and repeatedly flashes "DSP REBOOT" every second.
>>
>> So my guess is that I have a broken DSP.
>>
>> Is it worth it to try and replace the DSP? they are still in stock at
>> digikey.
>> But I am open for other ideas since I'm not keen on desoldering the
>> LQFP144.
>>
>> Best,
>> Julian
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