Control Data Corporation CYBER 180 810 Maintenance And Parts Manual page 163

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Check the air flow path (filter, blower, etc.).
Replace the air flow sensor assembly.
Replace the related protect module.
Replace the power control module.
Is a fault indicator on in the power or logic columns?
Replace the related protect board.
At this point it is necessary to troubleshoot the power control
system using diagrams and voltmeter. Be cautious when working in
areas that may contain dangerous voltage and current levels.
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