IBM 8685 Hardware Maintenance Manual - Page 166
Voltage related system shutdown, Replace VRM
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Voltage related system shutdown Note: See "System" on page 162 to determine which components should be replaced by a field service technician. Message Action System shutoff due to x current over max value (level-critical; system drawing too much current on voltage x bus) v See "Power checkout" on page 37. System shutoff due to x V over voltage (level-critical; system shutoff due to x supply over voltage) 1. Check the power-supply connectors 2. Power supply. 3. Power backplane. System shutoff due to x V under voltage 1. Check the power-supply connectors. (level-critical system shutoff due to x supply under voltage) 2. Power supply. 3. Power backplane. System shutoff due to VRM x over voltage v Replace VRM x. System shutoff due to excessive (< 240 1. See "Power checkout" on page 37. VA) loading 2. Cycle ac on/off. Temperature related system shutdown Note: See "System" on page 162 to determine which components should be replaced by a field service technician. Message Action System shutoff due to board over temperature (level-critical; board is over temperature) 1. Ensure that the system is being properly cooled; see "System reliability considerations" on page 41″. 2. Replace board. System shutoff due to CPU x over temperature (level-critical; CPU x is over temperature) 1. Ensure that the system is being properly cooled; see "System reliability considerations" on page 41. 2. Replace CPU x. System shutoff due to CPU x under temperature (level-critical; CPU x is under temperature) v Ambient temperature must be within normal operating specifications; see "Features and specifications" on page 3. System shutoff due to DASD temperature (sensor x) (level-critical; DASD area reported temperature outside recommended operating range) v Ensure that the system is being properly cooled; see "System reliability considerations" on page 41. System shutoff due to high ambient temperature (level-critical; high ambient temperature) v Ambient temperature must be within normal operating specifications; see "Features and specifications" on page 3. System shutoff due to system board under temperature (level-critical; system board is under temperature) v Ambient temperature must be within normal operating specifications; see "Features and specifications" on page 3. 156 xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide