------------------------------------------------------------------------------
304 - Keyboard or System
None
Keyboard
Unit Error
------------------------------------------------------------------------------
* See Section 5.4, "Memory Error Codes," for the location of the defective
memory chip.
------------------------------------------------------------------------------
Message
Beeps
Probable Failure
------------------------------------------------------------------------------
402 - Monochrome Display
1 Long,
Monochrome Display Controller Board
Controller Failure
2 Short
------------------------------------------------------------------------------
501 - Display Controller
1 Long,
Video Display or Video Controller
Failure
2 Short
Board
------------------------------------------------------------------------------
601 - Diskette Controller
None
Diskette Controller Board
Error
------------------------------------------------------------------------------
1780 - Disk 0 Failure
None
Fixed Disk Drive
------------------------------------------------------------------------------
1782 - Disk Controller
None
Fixed Disk Drive
Failure
------------------------------------------------------------------------------
1790 - Disk 0 Error
None
Fixed Disk Drive Recalibration
------------------------------------------------------------------------------
Parity Check 2 XX000B
None
Expansion RAM (Main Memory on COMPAQ
YYZZ *
PORTABLE 286)
------------------------------------------------------------------------------
Audible
1 Short
Power On successful:
COMMON (6 MHz)
speed
------------------------------------------------------------------------------
Audible
2 Short
Power On successful:
FAST (8 MHz)
speed
------------------------------------------------------------------------------
RESUME = "F1" KEY
None
Any failure
------------------------------------------------------------------------------
* See Section 5.4, "Memory Error Codes," for the location of the defective
memory chip.
==============================================================================
Table 5-2.
Power On Self Test Error Messages for the COMPAQ Portable and
COMPAQ PLUS Personal Computers
==============================================================================
Message
Beeps
Probable Failure
------------------------------------------------------------------------------
Audible
1 Beep
Power On successful
------------------------------------------------------------------------------
1XX
1 Long,
System ROM or System Board
1 Short
------------------------------------------------------------------------------
XXYY 20X
None
Failure
------------------------------------------------------------------------------
3XX or dd 3XX
None
Keyboard assembly or "stuck" key
------------------------------------------------------------------------------
4XX
None
Diskette/Printer Board
1 Long,
Video Display Unit or Video Controller
2 Short
Board
------------------------------------------------------------------------------
5XX
1 Long,
Video Display Unit (VDU) or Video
