Liquid Controls T350N-P - Manual (Page 9)

Sponsler, Inc. T350N-P Truck Totalizer/Printer pg. 9 Doc# MN-T350N-P
TROUBLE SHOOTING
(INTERNAL RAM TEST (Dipswitch position #9)
The self-test mode allows the totalizer’s microprocessor to per form internal tests
on the built-in RAM and ROM. The self test feature should be used only when a
problem is suspected with the totalizer.
To start the self-test, first set the pre-
scale selector switch (S4) to position #9 (self test).
To fully test itself, the on-board computer must perform 257 different tests. As
each test is completed, A & B LED’s on the RLC113 PCB will flash. In order to
perform the complete test the leds must flash 257 times. Upon completion of the
257 test the LCD display will print ‘Eprom & RAM OK!’. Any other message
indicates an error. If no message appears on the LCD display, it is possible that
the display bias control is not adjusted properly. To make the display and
background darker, adjust the display bias control fully counter-clockwise.
Adjusting this control clockwise will make the display and background lighter.
As long as the pre-scale selector switch (S4) is in position #9, the microprocessor
will continue to test itself. Leaving the switch in position #9 is a good way to
isolate any transitory problems.
NOTE: Be sure to set the pre-scale selector switch back to the correct position
for proper operation.