------------------------------------------------------------------------------
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
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