Thermo Scientific 3403 Manual page 36

Section 8
Appendices
Test 1 (5891, Power Board, Relay
Test 2 (5891, Power Board, Relay
Test 3 -10/A (ADC Read Test)
Test 11/B (Display Test)
Test 12/C(Battery Test)
Test 13/D (Audible Test)
8-4 Midi 40 CO2 Incubator
Note May not be available with ±40V buck-boost system.
0XAA Test)
This test simply communicates with the 5891 and sends a relay, data
pattern of 0xAA. Once the relays are set, the user intervention message
appears "1 U" so the user can look at the LEDs on the power board to
verify the correct on-off pattern (LEDs 5, 3, and 1 should be active and the
remaining LEDs inactive). Additional troubleshooting with a DMM
and/or ammeter may be required to determine if signal is operating
properly.
Note May not be available with ±40V buck-boost system.
0X55 Test)
This test simply communicates with the 5891 and sends a relay, data
pattern of 0x55. Once the relays are set the user intervention message
appears "2 U" so the user can look at the LEDs on the power board to
verify the correct on-off pattern (LEDs 6, 4, and 2 should be active and the
remaining LEDs inactive). Note that LED 6 will only be active when the
high-pressure cutout is functioning properly or manually shorted; i.e., J6-4
and J6-5 connected on the power board. Additional troubleshooting with
a DMM and/or ammeter may be required to determine if signal is
operating properly.
This test reads channels 0 to 7 of the ADC. When the test first initiates, a
Step# U will be displayed signaling the user to install the plug. Once the
plug is installed, then the user needs to press the mode/mute button again
to read the voltage. It will return a Test Pass message whenever the voltage
is between 0 V and 4.5 V. Eventually, we need to construct dummy,
resistance plugs/jacks to put into applicable channels per unit type and
code an appropriate voltage window in order to distinguish between CPU
board failure (conditioning circuit or otherwise) and sensor failure.
This test will light up all segments, icons, pixels, or otherwise of the given
display for 3 seconds to verify proper operation.
This test forces a battery test by loading the battery for approximately 500
ms and determining that a minimum voltage was maintained. It does
NOT effect the normal battery test frequency.
This test activates the beeper for 3 seconds to ensure proper operation.
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