"N_Cook" wrote in message
...
On 18/03/2014 12:05, Gareth Magennis wrote:
"N_Cook" wrote in message
...
Replaced the worst 2 pots with fairly stable minimum few 100s of ohms
settings of the rest, no LEDs.
I'm now assuming the inbuilt flash memory of the
P89LPC936F is corrupted as distinct from the RAMs. There is a vacant
header for in-cct programming with RST on the overlay. This line goes
to
the INV-RST pin of the uC and according to the datasheet a LOW on there
will reset the uC, but no change still no LEDs. It looks as though to
erase the flash , needs a Chip Erase command via in-cct programming, so
that looks like the end of this usual digital farting about. One more
effort ,Cannot find "factory reset" for Line6 spider stuff, will try 5
seconds on each at power-up and then 2/3/4 of the adjascent ones.



Hold Clean channel button and power on.

User manual he
http://l6c.scdn.line6.net/data/6/0a0...ev%20A%20).pdf



Gareth.



Did that, still dead so some other problem perhaps. I can see why no audio
throughput. The AK4552 audio ADC\DAC is held off at p13 by the big DSP
which presumably is held dead by the system uC. Its times like this that I
feel there is something dead simple, for just a bit of inside gen. I
think I'll rassemble in the chassis , perhaps there is some hidden ground
plane that connects to one of the fixing points.
As there was some audio for half a second on first connecting an input
there cannot be something permanently failed



These have built in noise gates, make sure your signal is big enough to turn
it on!

(I assume though the noise gate would not actually be muting the DAC via pin
13)

Oh and I've just thought, occasionally amps have a mute that is operated by
the switched input jack socket - injecting a signal further down the line
might not work.



Gareth.