Download - Nucleonix

S. No
07
08
09
NATURE OF PROBLEMS
OBSERVED
 LCD dot-matrix display
contrast was poor LCD
display characters were
erratic


Program values of
parameters & data values
are not stored
Doserate acquisition
failure in all units.
FAILURE ANALYSIS
RECTIFICATION DETAILS

Requires adjustment of trimpot
(P7)

On adjustment of P7 contrast
become alright.

Display module could be faulty


Controller may be faulty & need
reprogramming

On replacement of display
become alright.
Reprogrammed controller &
the problem got rectified.

EEPROM chip (U6) may be faulty


Counter chip may be facility or


Microcontroller chip program chip
is faulty

21
Controller was found to be OK
on replacement of U6, problem
got rectified.
On replacing the counter chip,
problem got rectified.
Counter chip was found to be
OK. On reprogramming to
microcontroller problem got
rectified.