Welch Allyn 5002 Series, Руководство по обслуживанию

Страница: 106 / 136

106
The following simplified trouble shooting procedures are recommended for identifying defective system components. Certain
corrective measures are provided. Only factory or authorized service facilities should perform more complicated servicing.
Most problems can be solved over the telephone. Problems requiring factory service are usually handled quickly and the scale
is on its way back. Call first to discuss the problem.
WEIGHT READING NOT ACCURATE
This can commonly be caused by a mechanical obstruction of the weighing platform. Check that the platform is not touching
some foreign object so that it is restricted in its downward movement. Also check that the connecting cable is firmly plugged
into the instrument circuit board. On those scales with masts check the mast cable for a firm connection to the base.
WEIGHT READING TAKES EXCESSIVE TIME TO DISPLAY
If the platform is in motion, the scale will wait for it to settle before displaying the weight. Excessive patient motion can cause
this.
Also check that the connecting cable is firmly plugged into the readout cabinet. Examine the weighing platform to ensure it is
not rubbing against a foreign object.
SCALE DISPLAYS “CAbLE” OR “O-LOAd”
This indicates the scale’s internal microcomputer has received a signal in excess of its expected value. “
O-LOAd” indicates the
weight signal is larger than the maximum value assigned to that particular model (see specifications on inside front cover). If
the weight value is within the specified range, this indicates a damaged transducer or defective instrument board.
The “ CAbLE” display indicates a signal outside the range of the internal a-d converter has been applied. This is most likely
caused by a damaged or disconnected transducer cable. On those scales with a mast, check the connection to the weighing
platform at its base. Also check the internal connection of the load cell connectors.
READING DOES NOT CHANGE WHEN WEIGHT APPLIED
Check that the weight platform is plugged into the readout. The platform cable, connector or load cell transducer may be
defective. The load cell transducer’s resistance can be checked with an ohmmeter after unplugging from the readout. The
proper resistance values are listed below:
5002, 5702, 6002 SCALES:
WIRE COLORS (PIN NO.)
WHT(4)/RED(5)
GRN(1)/BLK(2)
Pin to Ground
Full Scale Output
RESISTANCE
1000 ± 5 Ω
1180 ± 50 Ω
≥5 000 MΩ
2.2 mV/V ± 0.1%