Replacing The Display Printed Circuit Board; Entering Counts Mode - natus OLYMPIC SMART SCALE 50 Instruction Manual

Repair Procedures

Replacing the Display Printed Circuit Board

NOTE
Required Items:
To replace the display PCB:
1
2
3
Figure 6.7
4
5

Entering Counts Mode

If an electrical problem is suspect, such as the signal is beyond zero or the system
appears unstable, enter counts mode.
To enter counts mode:
1
2
3
6-12
Schematics, wiring diagrams, and PCB drawings are located on pages A-1–A-9.
If appropriate, test the display PCB to determine if replacement is required (see
page 6-11).
ESD protection
If the scale is on, press
power cord.
Disassemble the scale (see page 6-2).
Disconnect the ribbon cable from the display PCB by loosening and removing
the five mounting screws, then remove the display PCB (see Figure 6.7).
Removing the display PCB
Display PCB mounting screws (x5)
Place the new PCB into position, place and tighten the five mounting screws,
then connect the ribbon cable to the display PCB.
Reassemble and calibrate the scale (see page 6-4, then page 4-3).
When the scale is off, press and hold
. AD (analog/digital) counts are shown.
ON/OFF
To momentarily display the calibration coefficient (calconst), press
calculation for conversion to grams is:
grams=[(count - zero)*10,000]/calconst
Counts shown must be between 9000 and 13500 and remain steady. If out of
range or fluctuation is more than ±4, contact Natus Medical for support (see
page 5-4).
OLYMPIC SMART SCALE Model 50/51 Instruction Manual
to turn off the scale, then unplug the
ON/OFF
Ribbon cable connector
Display PCB
AVERAGE/UNLOCK
while pressing
. The
ZERO