EQUIPMENT REQUIRED:
#2 PHILLIPS SCREWDRIVER
SMALL FLAT BLADE SCREWDRIVER
PENCIL AND PAPER
NOTE: THIS PROCEDURE WAS WRITTEN BY DIGI-STAR (J-STAR) SCALE SYSTEMS UTILIZ-
ING EZ INDICATORS (EZ 150, EZ 210, OR EZ 320). IF YOU HAVE AN OLDER SCALE SYSTEM
WHICH UTILIZES AN OMP SERIES INDICATOR, YOU SHOULD OBTAIN A DIFFERENT TROUBLE-
SHOOTING PROCEDURE.
NOTE: IF THE SCALE RESPONDED TO YOUR
disconnecting the load cell wires, you will
1. DISCONNECT ALL THE LOAD CELL
WIRES FROM THE TERMINAL BLOCKS
INSIDE THE J-BOX (You can leave the
indicator on while connecting or
FIX OR REPLACE THE J-BOX
not damage the load cells or indicator if
wires are shortened during this step.)
IS THE READING ON THE
NOTE: BE AWARE OF ELECTRICAL
INTERFERENCE THAT MIGHT AFFECT
YOUR SCALE SUCH AS: MOBILE
PHONES, CB RADIOS, RADIO TOWERS,
ELECTRICAL MOTORS, ETC.
INDICATOR STABLE?
NO
REPLACE THE J-BOX
"ZERO") THE INDICATOR SHOULD
YES
HAVE YOU FOUND A BAD
CONNECTION OR A LOOSE WIRE?
2. ZERO BALANCE THE INDICATOR.
(First press "NET/GROSS" then
YES
NO
3. CONNECT ONE LOAD CELL BACK INTO ONE OF THE
NOTE: THE READING YOU GET FOR EACH LOAD CELL IS
DEPENDENT ON THE SIZE AND TYPE OF LOAD CELL AND HOW
MUCH WEIGHT IS OVER EACH LOAD CELL. IN GENERAL, THE
NUMBER SHOULD BE A POSITIVE AND BE STABLE.
DISPLAY "0".
TERMINALS IN THE J-BOX.
6. DISCONNECT THE FIRST LOAD CELL AND
RECONNECT A SECOND ONE. WRITE DOWN THE
INDICATOR READING FOR THAT LOAD CELL. STAND
OR HANG YOUR WEIGHT OVER THE CONNECTED
LOAD CELL. WRITE DOWN HOW MUCH THE WEIGHT
INCREASED WITH YOUR WEIGHT OVER THE LOAD CELL.
READINGS.
REMEMBER TO RECORD YOUR
7. REPEAT STEP 6 FOR THE
REMAINING LOAD CELLS.
OTHERS. ESPECIALLY WHEN ONE LOAD
WEIGHT, THAT'S VERIFICATION THAT THE
J-BOX IS OK. IF THE SCALE DID NOT
RESPOND TO YOUR WEIGHT, EITHER THAT
LOAD CELL IS BAD OR THE J-BOX IS BAD.
STILL SHOWS NO RESPONSE TO YOUR
WEIGHT, THE J-BOX IS PROBABLY BAD.
DO NOT EXPECT THE LOAD CELLS TO GIVE
YOU THE SAME READING. IT IS COMMON
FOR EACH LOAD CELL TO HAVE A READING
THOUSANDS, DIFFERENT THAN THE
THAT IS HUNDREDS, MAYBE EVEN
TRY THE OTHER LOAD CELLS. IF THE SCALE
CELL IS CARRYING MORE WEIGHT THAN
THE OTHERS.
WATCH FOR ANY OTHER SYMPTOMS SUCH AS
NOTE: YOU ARE GOING TO HOOK UP THE LOAD
IS TO GET A READING FOR EACH LOAD CELL. ALSO
WHILE PERFORMING THIS TEST, YOU SHOULD
CELLS TO THE J-BOX ONE AT A TIME (meaning only one
load cell connected at a time). THE PURPOSE OF THIS
ERRATIC/UNSTABLE DISPLAY, INDICATOR FLASHING
" RANGE", OR A NEGATIVE READING, ETC. IF THE
INDICATOR READING SHOULD EVER APPEAR
ABNORMAL WITH ANY LOAD CELL CONNECTED, THAT
LOAD CELL IS PROBABLY BAD.
4. WRITE DOWN THE INDICATOR READING WITH
THE LOAD CELL CONNECTED.
±
YOUR ACTUAL WEIGHT, BUT SIMILAR TO EACH
5. STAND OR HANG YOUR WEIGHT OVER
THE CONNECTED LOAD CELL. WRITE DOWN
HOW MUCH THE WEIGHT INCREASED WITH
YOUR WEIGHT OVER THE LOAD CELL.
(Don't be alarmed by the reading, a scale with
only one load cell connected will weigh heavy.)
8. A BAD LOAD CELL WILL HAVE A READING
THAT IS EITHER UNSTABLE, OR MAKES THE
INDICATOR FLASH " RANGE", OR IS MORE THAN
THREE TIMES GREATER, OR LESS THAN THE
AVERAGE OF THE OTHERS. ADDITIONALLY, THE
READINGS OF YOUR WEIGHT OVER EACH LOAD
CELL SHOULD BE SIMILAR. (PROBABLY 4 TIMES
±
OTHER.) ANY DIFFERENCES COULD BE AN
INDICATION OF A BAD LOAD CELL OR A
STRUCTURAL PROBLEM.
OM03089
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