natus OLYMPIC SMART SCALE 50, Инструкция по эксплуатации

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6-10 OLYMPIC SMART SCALE Model 50/51 Instruction Manual
Repair Procedures
3
Check the supply voltages (see Table 6.2).
4
If any voltages are out of tolerance, replace the main PCB.
5
Continue testing internal components, or reassemble and calibrate the scale (see
page 6-4, then page 4-3).
Testing the Power Supply Printed Circuit Board
If the scale lights do not illuminate or appears to be malfunctioning, a PCB may
be damaged. Test the PCB to confirm that it is damaged prior to replacing.
Required Items:
„
ESD protection
„
Voltmeter
To test the power supply 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
Check the supply voltages (see Table 6.3).
4
If any voltages are out of tolerance, replace the power supply PCB.
5
Continue testing internal components, or reassemble and calibrate the scale (see
page 6-4, then page 4-3).
Table 6.2
Main PCB test points
ID Test Point Expected Value
+5Vdigital TP1 5.00 ±0.1Vdc
+5Vanalog TP2 5.00 ±0.1Vdc
-5Vanalog TP3 -5.00 ±0.5Vdc
GND TP8 Reference
NOTE
#
An S1 jumper installed on the main PCB (see page 3-15) will disable the
KG/LB
button,
forcing the scale to only display kilograms.
NOTE
#
„
Schematics, wiring diagrams, and PCB drawings are located on pages A-1–A-9.
„
Before testing the PCB, check all fuses and connectors.
Table 6.3
Power supply PCB test points
ID Test Point Expected Value
Vin J4-1 12.00 ±0.25Vdc
CHG/AC_ON J3-1 5.00 ±0.25Vdc
GND TP1 Reference
Vbat TP2 7.2Vdc nominal
Vin J4-1 12.00 ±0.25Vdc