natus 60/65, Instruction Manual

Page: 29 / 96

OLYMPIC SMART SCALE
® Model 60/65
Section 3: Service
Page 3-10
Problems and Solutions
Schematics, wiring diagrams and PCB drawings are located at the
back of this manual.
Use the troubleshooting measurements, below, to test printed
circuit boards (PCBs) and components that are suspect of
being defective. For additional information, see
Troubleshooting
on page 3-20.
NOTE: The scale will not zero unless the tray is in place.
Ensure that the tray is in place when troubleshooting.
Before performing troubleshooting measurements:
1. Disassemble the scale (see
Disassembly
on page 3-6).
CAUTION: To avoid risk of electrical shock when the
device is disassembled, use battery power, as required,
for troubleshooting.
2. Use appropriate methods to determine if voltage is present at
the electrical outlet.
3. Ensure that all fuses and connectors are properly seated.
4. Check the supply voltages on main and power supply PCBs as
shown in Fig. 3L . If any voltages are out of tolerance, contact
Natus Medical about replacing the defective PCB.
ID Test Point Location PCB Value
Vin J4-1 Power supply 12.00 ±0.25Vdc
CHG/AC_ON J3-1 Power supply 5.00 ±0.25Vdc
GND TP1 Power supply reference
Vbat TP2 Power supply 7.2Vdc nominal
+5Vdigital TP1 Main 5.00 ±0.1Vdc
+5Vanalog TP2 Main 5.00 ±0.1Vdc
-5Vanalog TP3 Main -5.00 ±0.5Vdc
Fig. 3L