[DSP-10] Problems with Serial Shift Registers.

[Bob Larkin]

Chuck, I am not sure if all is well with U107 and U108, but it sounds like 
it is OK at least with  with the 126 MHz PLL. And almost for sure, as Mike 
says a problem with the 19.68 synthesizer. If it is just the latter, it 
sure suggests a problem with SER_EN2 (PF6) since they share the clock and 
data lines.

Possible help:  In order to help with the P101 reversal problem, for the 
EZKit only, not DSPx, in the software, the same signals that go to PF6 also 
go to PF1. This means that if PF6 is burned out in the ADSP-2181, it  may 
be the only portion not working, and recovery comes from moving the 
connection on the EZ-Kit board from P3-31 to P3-26. This requires the 
version 3.2 of the UHF3 DSP software.

It is also possible to never again use pin 12 of P101. To do this run the 
wire in the DSP-10 from the feed-through cap C211 to pin 6 of J101. Then 
cut the trace between F114 and pin 12 of P101. Run a jumper from the pad 
marked "6" on the very edge of the board, in the middle of P101, to the 
cut-trace pad of F114. This added work will prevent damage to the EZ-Kit if 
J101 is reversed and can be done on any DSP-10, as a safety feature.

Note that this modification may allow recovery for any EZ-Kit that has 
had  the 12V injection from the P101 reversal. I don't want to test this 
feature, but I know one DSP-10 owner has been able to recover this way!

Good luck, and I hope you get it up and going quickly!

73,
Bob  W7PUA

At 06:14 PM 2/9/2006, KD7TS wrote:
>Hi Chuck,
>
>I looked over my notes on this, and didn't see anything that fits your 
>symptoms. The +9 on U6 points to a lock problem on the 19.68 synthesizer. 
> From your description it seems most likely to be a programming problem 
>with the 145170 registers. Programming is only done once when the program 
>is loaded.
>
>
>I do have a couple of questions though.
>Have you ever plugged P-101 in backwards then powered up the DSP-10 ?
>
>Is hardware set to 1 in the config file, (UHFA.CFG) ?
>
>What versions are you using for UHF3.EXE and UHFA.EXE ?
>73 Mike KD7TS
>_______________________________________________
>
>Chuck E. Swedblom wrote
>
>Hi,
>
>My DSP10 had a failure and I traced it to U107 using
>the UDIAG2 diagnostic program.  I replaced U107 and
>U108 and the problem still exists.
>
>The UGDIAG1 shows that the serial lines are OK but
>UGDIAG2 gives the following for U107:  Pin 3 is zero
>should be 5V, pin 4 is 5V should be zero and pin 7 is
>zero should be 5V.  U108 lines are OK.
>
>The DSP10 displays the regular screen with the error:
>'PLL not locked'.  The 19.68MHz LO tunes both sides
>of this, but the output of U6 is at 9V.  The 10MHz ref.
>is OK on pin 1 and FIN pin 4 has a good 19.68 signal.
>
>The F_IN pin 8 on U104 has a good signal in the 123MHz
>to129MHz range.  The 10MHz Ref signal is OK.
>
>I need this transceiver very much for use at the  Owens Valley
>Radio Observatory, OVRO, using their 40 Meter Telescope
>at 10GHz.  The Kenwood I have been using just don't cut it!!
>
>Can someone shed some light on my dele ma?
>
>Chuck  WA6EXV