HP ProOne 400 G4 20-inch Non-Touch All-in-One Business PC User Manual download pdf (Page 42)

Hood sensor

The hood sensor is located to the right of the system board.

To remove the hood sensor:

1. Prepare the computer for disassembly (see Preparing to disassemble the computer on page 21).

2. Remove the stand (see Stand on page 21).

3. Remove the rear port cover (see Rear port cover on page 23).

4. Disconnect the hood sensor cable from the system board (1).

5. Remove the cable from the clips in the computer (2).

6. Pry the sensor out of the slot to remove it (3).

To install the hood sensor, reverse the removal procedures.

34 Chapter 4 Removal and Replacement Procedures

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About This Book 3
Table of contents 5
1 Product features 9
Front components 10
Side components 10
Rear components 11
Bottom components 11
Component 14
(1) Serial number 14
(2) Product number 14
(3) Warranty period 14
Labels 7 15
2 Illustrated parts catalog 16
System parts 9 17
Mass storage devices 19
Processors and memory modules 20
Keyboards and mice 20
Keyboards and mice 13 21
Generating static 22
Grounding the work area 23
Operating guidelines 24
Routine care 25
Service considerations 26
Hard Drives 27
Lithium coin cell battery 27
SATA hard drive cables 28
Cable management 28
VESA bracket 30
Rear port cover 31
Hard drive 32
Hard drive 25 33
Optical drive 34
Optical drive 27 35
M.2 solid-state drive 36
WLAN module 40
Option board 41
Hood sensor 42
Fan assembly 43
Heat sink 44
Processor 46
System board 47
System board callouts 49
Speakers 50
20-models 51
Power button board 53
23.8-inch models 62
(1) Microphone modules 63
Webcam 55 63
20-inch models 65
Antennas in 23.8-inch models 66
Computer Setup–Main 69
Computer Setup—Security 71
Computer Setup—Advanced 75
Safety and comfort 86
Helpful hints 87
Solving general problems 88
Solving general problems 81 89
Solving power problems 91
Solving hard drive problems 92
Solving audio problems 94
Solving printer problems 95
Solving network problems 98
Solving network problems 91 99
Solving memory problems 100
Solving memory problems 93 101
Solving software problems 103
Using Windows tools 105
Before you begin 106
Creating the recovery media 106
Restoring and recovery 107
Resetting the password jumper 117
A Power cord set requirements 120
Country-specic requirements 121
Nonvolatile memory usage 124
Nonvolatile memory usage 117 125
Questions and answers 126
C Specications 128

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HP ProOne 400 G4 20-inch Non-Touch All-in-One Business PC User Manual Page 42

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