[sdiy] help with uQ repair

Thu Feb 23 19:07:08 CET 2017

You might be right since we don't have the schematic.  You could look for
79L regulators.  Lots of other Waldorf stuff uses 79L for the negative
supply.

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

> Imho the microQ is a positive only design. No analogue filter like on the
> wave.
> There are 2 x 7805, a single LF33 and the 12V from the PSU.
> Then you have a few mosfets and the logic chips for the button
> multiplexing.
>
> Not sure which rails there are left to check.
> Even the output OpAmps are running in single rail configuration.
>
> julian
>
>
>
> Am 23.02.2017 um 18:10 schrieb 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/waldo
>> rf_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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