[sdiy] help with uQ repair

Thu Feb 23 17:31:29 CET 2017

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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