[sdiy] help with uQ repair
Julian Schmidt
elfenjunge at gmx.net
Fri Feb 24 18:00:04 CET 2017
You were kind of right, too.
There is another 78/7908 pair in the analogue out section in so8 cases.
But the -12V for the 7908 is derived from a charge pump that is not
running until the unit is fully bootet.
But I guess I'll get to that when the DSP test passes.
Julian
Am 23.02.2017 um 19:07 schrieb Peter Pearson:
> 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
> <mailto: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 <mailto: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
>>> <https://elektrotanya.com/waldorf_microwave.pdf/download.html>
>>> On Thu, Feb 23, 2017 at 11:30 Peter Pearson
>>> <electrocontinuo at gmail.com
>>> <mailto:electrocontinuo at gmail.com>> wrote:
>>>
>>> Check +/- 12V
>>> On Thu, Feb 23, 2017 at 11:29 Terry Shultz
>>> <thx1138 at earthlink.net <mailto: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
>>> <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
>>>> <mailto: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 <mailto: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
>>>>>
>>>>> page4image15160 page4image15320
>>>>>
>>>>> 1.
>>>>>
>>>>> — 192 x 24-bit bootstrap ROM (disabled in
>>>>> sixteen-bit compatibility mode)
>>>>>
>>>>> *
>>>>>
>>>>> Off-Chip Memory Expansion
>>>>>
>>>>> o
>>>>>
>>>>> —
>>>>> Datamemoryexpansionto256Kx24-bitwordmemoryforP,X,andYmemoryusingSRAM.
>>>>>
>>>>>
>>>>> o
>>>>>
>>>>> —
>>>>> Datamemoryexpansionto16Mx24-bitwordmemoryforP,X,andYmemoryusingDRAM.
>>>>>
>>>>>
>>>>> o
>>>>>
>>>>> —
>>>>> Externalmemoryexpansionport(twenty-fourdatapinsforhighspeedexternalmemoryaccessallowing
>>>>> for a large number of external
>>>>> accesses per sample)
>>>>>
>>>>> *
>>>>> o
>>>>>
>>>>> — Chip select logic for glueless
>>>>> interface to SRAMs
>>>>>
>>>>> o
>>>>>
>>>>> — 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
>>>>>> <mailto: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
>>>>>> <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>
>>>>>>> <mailto: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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