Section 3 - Troubleshooting
34 WELCH ALLYN ATLAS MONITOR
SERVICE MANUAL 6200-43E REV. A
Get Advanced Configuration menu
Set Second trace selection to CO
2
Press <TREND> to return to idle screen
Remove and reinsert watertrap in socket. Make sure that it
seats fully.
If pump does not start:
Insert finger in socket and attempt to press
microswitch
If pump does not start:
Check connections between CO
2
board and Main board
Check connections between CO
2
receiver and CO
2
board
Replace CO
2
receiver
Replace CO
2
board
Temp display is blank
Connect temp probe
See temp display of ambient temperature
If display is not close to ambient temperature: Cali-
brate Temp – if out of spec, replace probe, repeat. If
still out of spec, replace main board.
Disconnect temp probe
Temp display becomes dashes
If temp display does not become dashes: Replace
main board
Turn power off and back on and see if anomaly returns
Re-install software
Repeat test
If problem remains: Replace CPU board
Models 622xx and 623xx:
If fan does not start when power turned on:
Check Fan to Main board cable
Replace Fan
Replace Main board
CO
2
2
TEMP1
Bad Boot 1
Fan 1
3.4 Diagnostic Tests
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