HP Omnibook 300 425 430 530 Service Manual

15Power Source ProblemsStart: No power 
lamp, or low battery 
lifeBattery in 
Omnibook?Turn Omnibook offRemove and reinsert 
batteryHP ac adapter 
and cable?DoneConnect OB to ac adapter, plug 
adapter into wall socketTurn on OmnibookSee power 
light?Light on continuously (not intermittent)?Try different 
power socket Yes
YesNo Yes
No
NoAB 

16Power Source Problems (continued)Light on continuously (not intermittent)?Try different 
power socketSee power 
light?Done: Power 
source problemRecheck cables, connections: 
ac adapter to Light still 
intermittent?Done: Suspect bad ac adapter, cable, or connectorDoneAmbient temperature within specification?Go to Power 
Management 
Problems 
flowchartDone: Bring 
temperature within 
specificationsEnsure power 
coming from 
wall socketEnsure battery 
installed 
correctly Yes
Yes
Yes
Yes No
NoNo
NoABC 

17Power Source Problems (continued)Can you 
substitute known 
good ac adapter?See steady 
power light?Can you substitute known good OB?Done: Original ac 
adapter or cable 
badAc adapter 
warm?Done: Suspect bad 
ac adapter or cableSee steady 
power light?Done: Suspect 
original OB base 
unit badYes
Yes
Yes
YesYes No
No
No
NoNoC 

18Boot-Up ProblemsStart: Problems during 
bootupPress Ctrl Alt 
Del to get a 
clean bootHear  
single or multiple 
beeps during 
boot?See  Windows or DOS prompt in 
display?OB  
support utility 
disk available?DoneOB  
support utility 
disk available? Multiple beepsSingle beepsSuspect software 
problem: locate OB 
support utility disk and 
call backInsert OB 
support utility 
disk and rebootSee prompt to 
enter time and 
date?Done Done: Suspect bad 
Omnibook base unit YesNo YesNo
Yes
No 
No 
Yes 

19Display ProblemsStart:
Power light on, but no
displayPhysical
inspection of
displayAdjust brightness
and contrast
controlsSee anything in
display?DoneGo to Boot-Up
Problems
flowchartYesNo 

20Hard Disk ProblemsStart: Hard disk fails to boot
up to DOS or Windows; or
other hard disk problemsSee
anything in
drive C:?HP hard
disk?Noisy?See Non-
system disk?Suspect corrupt files
on hard diskBoot from OB
companion disk in
drive A:Do
SCANDISK C:Soft checking
OK?ABInsert hard disk in C:Speech: Need hard disk to
boot correctlyDoneDoneDone: Hard
disk badInsert hard disk containing
system filesDoneYesYes
Yes
Yes
YesNo
No
No No
No 

21Hard Disk Problems (continued)Do hard checking.
Save logs.
Let SCANDISK repair errors.Do hard checking.
Save logs.
Let SCANDISK repair errors.ABSpace available on
hard disk within
spec?Boot from drive C:Done: Hard
disk badBoot from OB companion
disk in drive A:Do SCANDISK C:Do CHKDSK C:Number of bad
sectors out of
spec?Suspect software problemBoot from OB companion
disk in drive A:Do
SCANDISK C: /AUTOFIXCBoots without
errors?DoneGo to Boot-Up
Problems
flowchartDone: Hard
disk bad Yes
YesYes No
NoNo 

22Hard Disk Problems (continued)Remove disk from
drive A:Boot from drive C:Give customer general data
recovery hintsDOS and Windows
boot OK?CIs
customer willing
to reformat hard
disk?Boot from drive A:Back up hard disk to A:Reformat hard diskReload imageDoneDone: Customer must
purchase another
hard diskDoneYes
YesNo No 

23Memory ProblemsStart: Problem with 
plug-in memoryIntermittent 
problem? YesEnd current 
session. NoRun short OB 
memory self-testExit software 
and turn off OBRemove OB 
battery, 
disconnect ac 
adapterRemove and 
examine 
memory moduleModule 
appropriate and 
compatible?With memory 
module 
removed, 
replace battery, 
attach ac 
adapterADone: Memory 
inappropriate for  
this model OB YesMemory 
self-test OK?Done: Suspect bad 
memory moduleRun long OB 
memory self-testMemory 
self-test OK?Run...

24Memory Problems (continued)Power up OB (memory module removed)Memory 
problem 
disappears?Done: Suspect bad 
memory moduleRun short OB memory self-test (without memory module)Memory 
self-test OK?Run long OB memory self-test (without memory module)Memory 
self-test OK?Done: Suspect 
memory module badDone: Suspect OB base unit badA
Yes
Yes
YesNo
No
No