HP Z840 Workstation Series Service Manual

Screen message Probable cause Recommended action
518—PCI fan not detected PCI fan missing, disconnected, or
defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
519—Hard drive fan not
detected
Hard drive fan missing, disconnected, or
defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
520—Memory fan (2) not
detected
Memory fan (2) missing, disconnected,
or defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
521—Memory fan (3) not
detected
Memory fan(3) missing, disconnected, or
defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
522—Memory fan (4) not
detected
Memory fan(4) missing, disconnected, or
defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
523—CPU fan (2) not detected Processor fan(2) missing, disconnected,
or defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
524—Rear chassis fan(2) not
detected
Rear chassis fan(2) missing,
disconnected, or defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
525—Front chassis fan(2) not
detected
Front chassis fan(2) missing,
disconnected, or defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
526—CPU Liquid Cooling pump
not detected
Liquid cooling pump on CPU1 is not
detected.
1. Reseat the pump cable.
2. Replace the pump.
527—CPU Liquid Cooling pump
(2) not detected
Liquid cooling pump on CPU2 is not
detected.
1. Reseat the pump cable.
2. Replace the pump.
529—Unsupported WiFi
Device(s) Detected
An unsupported WiFi device has been
installed into an internal slot.
Remove the unsupported device.
917—Front Audio Not
Connected
Front Audio mechanism is missing or is
not connected.
1. Replace or reconnect the missing front audio
mechanism to the system board.
2. Reseat or replace the missing mechanism cable.
918—Front USB Not Connected Front USB mechanism is missing or is not
connected.
1. Replace or reconnect the missing Front USB
mechanism to the system board.
2. Reseat or replace the missing mechanism cable.
921—Front USB Not Connected Front USB mechanism is missing or is not
connected.
1. Replace or reconnect the missing Front USB
mechanism to the system board.
96 Chapter 4 Diagnostics and troubleshooting

HP Z840 Workstation Series Specifications

General

Chipset	Intel C612
Memory Slots	16 DIMM slots
Processor	Intel Xeon E5-2600 v3/v4 series
Storage	Supports SATA, SAS, and SSD
Graphics	NVIDIA Quadro and AMD FirePro options
Expansion Slots	7 PCIe slots
Power Supply	1125W 90% efficient
Operating System	Windows 10 Pro 64, Red Hat Enterprise Linux, SUSE Linux Enterprise Desktop
Ports	USB 3.0, USB 2.0