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IWQ Series Service Manual
5.3 Troubleshooting
Phenomenon
Cause
Measure
1.No AC power supply.
•
Confirm voltage at the power
outlet.
•
Check the power cord, and
replace if necessary.
Confirm conduction of CN1
1:Black or 2:Red and plug of SW
power supply. Also check voltage
between the same pins.
2.ON/OFF key defect
•
Check conduction of the key
using a multi-meter, and replace
if necessary.
3.No VCC+5V supply.
•
Check conduction of harness C2
VCC, and replace if necessary.
•
Check SW power supply, and
replace if necessary.
Confirm grounding of the CN2 1,2
pin, and +5V at the 3,4 pin of the
SW power supply using a multi-
meter.
1. Nothing is displayed even when the
ON/OFF key is pressed
.
4.Main board defect.
•
Confirm by replacing the P-932
main board with a new or
defective one.
2. ”Err” displays when pressing
ON/OFF key .
1.E2ROM data is garbled.
•
Initialize Test Mode C6 E2ROM
entirely. (Span adjustment is
required after initialization.)
•
If not recovered, repair or
replace the main board.
3. Test Mode “C” displays when
pressing ON/OFF key .
1.Scale data is in the
initialization state.
•
Span adjustment.
1. A/D value is outside the
start range, or unstable.
•
AD initial value drifts.
•
Defect in load cell.
•
Remove item from on the
weighing platter.
•
Check and adjust A/D value.
Perform Test Mode C1, and if
unstable, replace A/D board and
load cell in the order.
If outside start range, perform zero
and span adjustment.
•
Replace load cell if weighing
value reaches the lower limit
under the weighing capacity at
zero/span adjustment.
4. When pressing ON/OFF key ,
and after display check is finished,
“----“ is displayed for weight and
buzzer sounds continuously.
2.Incorrect supplied
voltage VEX+5V of load
cell.
•
Defect in main board
•
Check VEX+5V between R-W of
A/D board XJ2 by using multi-
meter. If the voltage is low or
fluctuated, replace main board to
generate VEX.
5. Zero point and/or weighing value is
fluctuated.
1.Influence of wind or
vibrations at the set
location.
•
If the scale is exposed to wind,
move the scale to an other
place, etc.
•
If influenced by vibrations from
floor or platform, move the scale.
