Compaq 6720s - Notebook PC Specifications Page 85
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RTC battery
NOTE: Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all passwords
and CMOS settings to be cleared.
Description Spare part number
RTC battery 449137-001
Before removing the RTC battery, follow these steps:
1.
Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2.
Disconnect all external devices connected to the computer.
3.
Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
then unplugging the AC adapter from the computer.
4.
Remove the battery (see
Battery on page 39).
5.
Remove the following components:
a.
Hard drive (see
Hard drive on page 40)
b.
Optical drive (see
Optical drive on page 46)
c.
Keyboard (see
Keyboard on page 50)
d.
Switch cover (see
Switch cover on page 47)
e.
Speaker (see
Speaker on page 53)
f.
Display lid switch module (see
Display lid switch module on page 54)
g.
Display assembly (see
Display assembly on page 55)
h.
Top cover (see
Top cover on page 59)
i.
System board (see
System board on page 65)
Remove the RTC battery:
1.
Turn the system board upside down, with the audio connectors toward you.
Component replacement procedures 77
- HP Compaq 6720s Notebook PC 1
- Safety warning notice 3
- Table of contents 5
- Product description 9
- Top components 14
- Buttons, lights, and speaker 15
- Front components 17
- Right-side components 18
- Left-side components 19
- Bottom components 20
- Illustrated parts catalog 21
- Computer major components 22
- Computer major components 15 23
- Computer major components 17 25
- Computer major components 19 27
- Plastics Kit 29
- Cable Kit 30
- Mass storage devices 31
- Miscellaneous parts 32
- Removal and replacement 39
- Cables and connectors 40
- Drive handling 40
- Grounding guidelines 41
- Unknown user password 44
- Serial number 45
- Computer feet 46
- Description Spare part number 47
- WLAN module 50
- Memory module 53
- Optical drive 54
- Switch cover 55
- Keyboard 58
- Speaker 456593-001 61
- Display assembly 63
- Top cover 67
- Bluetooth module 72
- System board 73
- Fan 431312-001 77
- Heat sink 79
- Processor 81
- Modem module 83
- Remove the modem module 84
- RTC battery 85
- ExpressCard assembly 86
- Computer Setup 88
- Using Computer Setup 89
- Computer Setup menus 90
- Security menu 91
- Diagnostics menu 91
- System Configuration menu 92
- Computer Setup menus 85 93
- Specifications 94
- Hard drive specifications 96
- 90 Chapter 6 Specifications 98
- System DMA specifications 99
- 92 Chapter 6 Specifications 100
- 94 Chapter 6 Specifications 102
- Screw listing 104
- Black 4 5.0 mm 2.0 mm 5.0 mm 105
- Phillips PM3.0×4.0 screw 107
- Phillips PM2.5×4.0 screw 108
- Torx T8M2.5×7.0 screw 109
- 102 Chapter 7 Screw listing 110
- Phillips PM2.0×4.0 screw 111
- 104 Chapter 7 Screw listing 112
- Phillips PM2.0×4.0 screw 105 113
- Torx T8M2.5×9.0 screw 114
- Black 3 3.0 mm 2.5 mm 8.0 mm 115
- Torx T8M2.5×4.0 screw 109 117
- 110 Chapter 7 Screw listing 118
- Torx T8M2.5×6.0 screw 119
- Phillips PM2.0×6.0 screw 120
- Torx T8M2.0×4.0 screw 121
- Phillips PM2.5×7.0 screw 122
- Silver 1 7.0 mm 2.5 mm 5.0 mm 123
- Phillips PM2.0×8.0 screw 125
- Backup and recovery 126
- When to back up 127
- Backup suggestions 127
- Creating recovery points 129
- Scheduling backups 129
- Connector pin assignments 139
- External monitor 140
- RJ-11 (modem) 141
- RJ-45 (network) 142
- Universal Serial Bus 142
- Power cord set requirements 143
- Recycling 145
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