Digital Equipment DECpc LPv 425sx Service Maintenance Manual page 4

Table of Contents
R P
EMOVAL ROCEDURES
Removing a 5¼-Inch FDD.............................................................................................................................37
Removing a 3½-Inch FDD.............................................................................................................................38
Removing the Mounting Adapter ..................................................................................................................39
Removing the Internal Mounting Tray..........................................................................................................40
Removing the IDE Disk Drive from Mounting Tray ...................................................................................41
Removing the Main Logic Board ..................................................................................................................42
Main Logic Board Connections.....................................................................................................................42
Removing the Power Supply .........................................................................................................................43
Removing the Filler Panels ............................................................................................................................44
I P
NSTALLATION ROCEDURES
Installing External Cache Memory................................................................................................................45
Installing a Higher Performance CPU...........................................................................................................47
R P
EPLACEMENT ROCEDURES
Replacing the Computer Battery/Real Time Clock (RTC) ..........................................................................48
C D
ONNECTING ISKETTE AND
C SCSI D
ONNECTING EVICES
CHAPTER 4 TROUBLESHOOTING..........................................................................................................51
I T
NITIAL ROUBLESHOOTING
B C .........................................................................................................................................................52
EEP ODES
Beep Codes for Fatal Errors ...........................................................................................................................52
Beep Codes for Non-Fatal Errors ..................................................................................................................53
POST B M
AND OOT ESSAGES
C T
OMPUTER ROUBLESHOOTING
D D T
ISK RIVE ROUBLESHOOTING
M T
ONITOR ROUBLESHOOTING
QAPlus/FE Error Messages ...........................................................................................................................59
CHAPTER 5 DEVICE MAPPING................................................................................................................61
Computer Memory Map.................................................................................................................................61
I/O Address Map.............................................................................................................................................62
Computer Interrupt Levels .............................................................................................................................63
DMA Channel Assignment ............................................................................................................................63
CHAPTER 6 PASS / FAIL CRITERIA........................................................................................................65
APPENDIX A SERVICE NOTES .................................................................................................................67
APPENDIX B USEFUL INFORMATION...................................................................................................69
R D
ELATED OCUMENTATION
O -L B B
N INE ULLETIN OARDS
DOCUMENT FEEDBACK ..............................................................................................................................71
PERSONAL NOTES .........................................................................................................................................73
READERS COMMENTS....................................................................................................................................77
4
.....................................................................................................................................37
.............................................................................................................................45
.............................................................................................................................48
IDE D ......................................................................................................49
EVICES
..............................................................................................................................49
...............................................................................................................................51
..............................................................................................................................53
........................................................................................................................55
.......................................................................................................................57
...........................................................................................................................58
...............................................................................................................................69
..............................................................................................................................69
Digital DECpc LPv/LPv+
MCS Logistics Engineering - Nijmegen