natus OLYMPIC SMART SCALE 50, Инструкция по эксплуатации

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6-12 OLYMPIC SMART SCALE Model 50/51 Instruction Manual
Repair Procedures
Replacing the Display Printed Circuit Board
Required Items:
„
ESD protection
To replace the display PCB:
1
If the scale is on, press
ON/OFF
to turn off the scale, then unplug the
power cord.
2
Disassemble the scale (see page 6-2).
3
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).
Figure 6.7 Removing the display PCB
4
Place the new PCB into position, place and tighten the five mounting screws,
then connect the ribbon cable to the display PCB.
5
Reassemble and calibrate the scale (see page 6-4, then page 4-3).
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
When the scale is off, press and hold
AVERAGE/UNLOCK
while pressing
ON/OFF
. AD (analog/digital) counts are shown.
2
To momentarily display the calibration coefficient (calconst), press
ZERO
. The
calculation for conversion to grams is:
grams=[(count - zero)*10,000]/calconst
3
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).
NOTE
#
„
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).
Display PCB mounting screws (x5) Display PCB
Ribbon cable connector