Jed;

	I seem to have a hardware problem with the 8 bit ADC.  I have an 
intermitent problem with the pot reading moving without any change in the pot.
I have experienced this with the PCB on Rotberg's bench and I have recieved
reports of it occuring on field test and on my bench.

	I have a scope hooked up to the pot output and to the input on the ADC.
The value on the ADC input will change when the pot value doesn't.  The ADC will
slowly move until it snaps back to the correct reading.

	Could you give us some help here?

						Thanks

Although I have not been able to duplicate the problem I believe it is due
to the unused A/D inputs floating.

In this regard, Input 6 may be the worst because, having been used only 
internaly to read the output of the Strain Gage Brake Amplifier, it has no 
bypass capacitors whose leakage can keep the A/D's input reasonably biased.
It does, however, have a very nice resistor to ground which, unfortunately, 
was not loaded.

Plan A: Load R193 (1K, on Sheet 16)

Plan B: Load R193 (1K, on Sheet 16);
	Replace C5, C6, C7, C8, and C14 with 100K 1/8W Resistors (110027-104)


I have added R193 to Rotberg's board so we can get a headstart in deciding
which solution to use.

We are under severe time constraints because Manufacturing is scheduled to
start building the boards this week.

If we choose Plan B we will need Meyette's blessing because these capacitors
may affect FCC.

Also: I need a SLOOP to verify Self-Test (and the SLOOP).

Also: I have done the Board Test Procedure for Manufacturing. Copies are 
available upon request.


Regards,

Jed

	SLOOP should come today.  Glenn was handling field tests all Friday.

	I managed to get a failure on Rotberg's PCB.  I noticed that input 6
(counting 0 to 7) was below 0, the same as input 1 on the ADC!!!!  Moving the
pot just a little brought the value to 20H, where it should have been.

	Could I have a copy of the board test procedure?  Glenn needs one too.

	I came in this morning and moved the pot and immediately the value of
the volume pot slowly converged to 0.  It has stayed that way now.  You may 
come in and see it for yourself.

	I have only one other report of this happening in the field although
I do not know for sure of the exact failure mode.  Otherwise I would replace 
the ADC of Rotberg's PCB and hope that it was a bad part.  I'll try to get
the other failing PCB in from the field today.

From:	KIM::LOGG          6-AUG-1991 13:46:22.59
To:	MCNAMARA
CC:	
Subj:	SLOOPs


	Did you burn 2 for Jed?  If not please do that as soon as you can.
He is waiting for them.

***********************************************************************
Ed,
Yes I did burn two for Jed.

Jed,
They are on my desk. I'm leaving for GolfLand right now and will get them to you
when I get back.

Glenn