HP Z640 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 Z640 Workstation Series Specifications

General

Chipset	Intel C612
Memory Slots	8 DIMM slots
Form Factor	Tower
Processor Options	Intel Xeon E5-2600 v3/v4
Storage Options	SATA, SAS, SSD
Storage Controllers	Integrated SATA 6.0 Gb/s controller
Graphics Options	NVIDIA Quadro, AMD FirePro
Expansion Slots	1 PCIe Gen3 x8; 1 PCIe Gen3 x4; 1 PCI
Audio	Integrated Realtek HD ALC221
Networking	Integrated Intel I218LM PCIe GbE
Operating Systems	Windows 10