Novametrix Medical Systems OXYPLETH 520A, Service Manual

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Section 12
Functional Test
54
Model 520A Service Manual 5693-90-01
PRELIMINARY
normal power up sequence. Note that the system date and time are not af-
fected by this action.
Softkey #1
= EPROM Checksum Test, Production Test Mode
Turn the monitor on while holding
Softkey #1
(the leftmost softkey) and
the monitor calculates and displays the checksum value of the EPROM
containing the system software. Press and hold
Softkey #3
while the
checksum is displayed and the monitor enters Production Test Mode.
Softkey #2
=Extended Display and Watchdog Test
Turn the monitor on while holding
Softkey #2
(second from left) and all
front panel indicators and display segments illuminate for several sec-
onds. The watchdog now resets the monitor which should then execute its
normal power up sequence. Note that the
indicator will illuminate only
if the monitor is being powered from the AC Mains.
Figure 12. Softkey Identification
Softkey #1 Softkey #2