Thanks for the info Brad.
There's no quick way through this to find out. If they are the ADCs,
they're not something I can replace in an acceptable timeframe. When
mystified, I am inclined to try to redesign a unit by examining the
parts and asking "How would these do the job?" After examining the parts
I've decided our designer was addicted to an illegal substance, and
there's so many parts in there doing so little that it's no real clue to
anything. Did this have gps and radio out sesnitive informationto the
enemy?? I don't have a bus away from them. It's possible they are
talking to the 93LC66 (eeprom) and the board is reading it, but then
they are serial ADCs :-/.
Somebody can get a manual or forget it.
On Thu, Nov 13, 2003 at 11:04:20PM -0800, Brad O'Dell enlightened us
thusly
> I have some chips in my collection that have a similar marking. They
> are 20-pin DIP chips and the top line is "<same logo> AMI 9208MDW".
> Pattern seems like that of your chip except it has "AMI" (as in
> AMI/Gould) instead of TIP(?). My chip is a 18CV8 PEEL PLD chip. In
> your case, I'd bet that they are the three DACs, one for each channel.
> The rest of the marking is probably an OEM marking. Another note:
> Mostek either sold out to, or became Thomson and then merged with SGS
> to become SGS-Thomson and then ST Microelectronics. They still make
> much of the former Mostek line, including the battery-backed SRAM
> modules with the MK prefix. ----- Original Message ----- To:
> "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]> Sent:
> Friday, November 07, 2003 6:29 AM
>
>
> > I have a 3 channel chart recorder for repair. The problem is an
> > error '9999.9 - ADFAIL' comes up on all three channels. At the heart
> > of each is a 28 pin plcc chip. It says <logo> TIP 9924NCC C17619
> > 120S1355 REV 01
> >
> > The logo is a smallish 'M' in a circle, but it's a very plain 'M',
> > not reminiscent of Motorola or Maxim, who use slightly fancy 'M' in
> > their logos. There is three of the above chips. The cpu is separate.
> >
> > Google returns rubbish, of course.
> >
> > It's about 5 years old, and I suspected a power supply, but all
> > seems good. It's a bit difficult to tell, because the circuit has
> > loads of little 78Lxx and low power lm317s in strange places and is
> > inclined to dissappear up it's own backside when you try and follow
> > it ;-). All the other stuff is Common enough (National/ST parts) and
> > the transistors are pro electron, so we appear safe from
> > inscrutable Far Eastern devices.
> >
> > The other bits on each channel (taking a variety of temp probes) are
> > a 93LC66 (serial eprom) LM324, LM393, & some optocouplers. There
> > isn't a databus going off either. Serial?
> >
> > Nothing that looks like an a/d on the main board. A Mostek(!)48Z02
> > and a Goldstar(That's an Irish meat company!) GM76C88AL-12 are the
> > only things beside logic, and the cpu, which is a 68HC11.
> >
> > Any ideas welcome.
--
With best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
INET: [EMAIL PROTECTED]
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