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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