Olympic 50 - Advanced Service and Troubleshooting; Troubleshooting; Symptoms and Suggested Tests; Theory of Operation

4, Adjust the Fine Zero pot until thedisplayreads. 16,384.
Note: Due to electronic noise, the display will jitter +2. This
is normal.
5. Momentarily press Zero button. The display will read 0
+2.
6. Remove the calibration weights.
7. Adjust the Coarse Span pot (Fig. 4-3) until the display
reads -5000 +30.
8. Adjust the Fine Span pot (Fig. 4-3) until the display
reads -5000 +2.
9. Press Zero. The display should show 11,384. If not,
repeat steps 2 thru 8. If the Scale will not calibrate, contact
the Olympic Medical Service Department toll free number
1 800 426-0353.
10. Press Calib switch off, (Fig. 4-2), down.
11. Replace Calibration hatch cover.
Changing Power-Up Display
Smart Scale is pre-set to power up in the pounds-ounces
mode. To have it power up in the kilograms mode:
1. Disconnect the power cord from the wall outlet.
2. Remove the two screws holding the calibration switch
panel (Fig. 4-2).
3. Push switch S1-1 down.
4. Replace access cover.
Specifications
Accuracy (Nominal): + 0.02 kg (102)
Capacity: 25 kg (55 Ib)
Resolution: 0.02 kg (1 oz)
Scale Weight: 57 ib.
Scale Dimensions:
Sides Up: 28"W x 22"D x 10"H
Sides Down: 38.3"W x 22"d x 10"H
Power Reguirements:
220/240 VAC, 50/60 Hz, 10 W
Battery Reguirements:
Six, C-size, NiCad, rechargeable
Troubleshooting
The Olympic Smart Scale, Model 50, can be field serviced
to the printed circuit board (PCB) level. The faulty board
mustbe returned t to Olympic Medical for repair or replace-
ment.
Inorder to identify the problem, please follow the Trouble-
shooting and Theory of Operation sections carefully.
-SS50-N1-220V(B09)
Troubleshooting requires the weighing platform be re-
moved to expose the test points on the scale's main printed
circuit board (Fig. 4-7).
Prior to performing any troubleshooting, read the Smart
Scale Theory of Operation, page 4-7. This provides an
overview of how the Scale circuits operate
CAUTION: Only hospital-qualified personnel should
perform internal servicing. Electrical shock hazard
when circuits are exposed.
Static and Contamination
The integrated circuits and semiconductors on the PCB’s
can be damaged by electrostatic discharge or by body oil
contamination and fluids such as disinfectants. Always
observe proper handling precautions (below) at all times.
« Minimize handling of circuit boards.
- Discharge personal static by touching grounded metal or
by wearing a. grounded wrist strap, before touching
parts.
- Keep replacement boards in their anti-static bags until
ready to use.
- Avoid touching pins or traces. Handle PCBs by edges to
avoid static discharge and avoid contamination by oil
from fingers.
ㆍ Avoid plastic, vinyl and styrofoam in the work area.
- Avoid wearing clothing which may pick up static elec-
tricity.
- Do not slide PCBs or components over any surface.
| Troubleshooting Hints
CAUTION: Operate Scale in the battery mode, when
possible, to avoid electric shock.
- Analyze symptoms BEFORE disassembly and trouble-
shooting. Read the Theory of Operation section to
understand the system. Formulate a theory ofa possible
cause for the symptom and make tests to check the
theory.
- Check the easiest and most obvious possible problems
first (such as fuses, mechanical interference, dead bat-
teries, etc.).
- Study the specifications and user's instructions, par-
ticularly the front panel switch logic to be sure that the
Scale is behaving abnormally. In some situations cer-
tain switches normally do not work. For example, Zero
will not work if display is locked. Recall will only work if
the Scale is off.
- Perform-a-thorough visual inspection... All connectors
and cables should be connected and secure. Check for
chafed or pinched wires. Check for signs of overheated
components. Check that all socketed parts are firmly
seated in their sockets. Check for interference with load
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