Novametrix Medical Systems OXYPLETH 520A, Service Manual

Page: 53 / 133

Assembly Exchanges
5-Jun-01 Model 520A Service Manual
43
PRELIMINARY
Board from the rear panel. Remove the front Bezel assembly then slide the
2471 Main Board out, the 2472 Power Supply Board and Battery should be
exposed.
4. The separate sections of the monitor can now be removed.
5. IMPORTANT. The battery is connected to the Power Supply Board through
connector J302. Before attempting to apply power to the monitor ensure all
connections are properly made, then connect the AC mains and turn the PEM
switch to “|”, ensure that the
on the front panel illuminates before powering
up.
6. Remove/replace the various assemblies as needed. IMPORTANT: The
monitor will be damaged if power is applied to it while cables or assemblies
are improperly connected.
7. After the monitor is fully assembled perform safety checks. Reconnect the
line cord to the AC Mains and to the monitor. Set the AC Mains switch to the
“|” (On) position. Verify the
indicator illuminates. Turn the monitor on.
8. Measure the AC leakage current from the monitor’s chassis to earth ground
with the monitor grounded, ungrounded, and ungrounded reverse polarity.
When operating from 100/120 VAC, no leakage current may be greater than
25
µ
A. If operating at 220/240 VAC, no leakage current may be greater than
50
µ
A.
9. With the monitor grounded, measure from the AC line to the SaO
2
Input
connector pins. When operating from 100/120 VAC, no leakage current may
be greater than 25
µ
A. If operating at 220/240 VAC, no leakage current may
be greater than 50
µ
A.
Figure 10. 520A Assembly with 2471 Main Board Removed
2472 Power Supply Board
Battery
SpO2 Input Assy
Battery Connection
to Power
Supply P302