HP Portable PLUS - Page 5

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Contents
Chapter
5.16
5.17
5.18
5.19
5.19.1
5.19.2
5.19.3
5.19.4
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
7
8
8.1
8.2
8.2.1
8.2.2
8.3
8.3.1
8.3.2
8.4
8.5
8.6
9
10
10.1
10.2
10.3
10.3.1
10.3.2
10.3.3
10.3.4
10.3.5
10.3.6
10.3.7
10.3.8
10.3.9
10.3.10
Portable PLUS Computer
Page
System ROM and Built-In RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-23
Configuration
EPROM ..................... ...... .... . ...... . . . .. 5-24
Plug-In Ports
................... . ............... . . .. . ....... . . .. 5-24
System
Extensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-24
Memory (RAM) Drawer
............... .. ..... ........ . ......... 5-24
Software
(ROM) Drawer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-24
Video Interface
..... . . . ......... . ... .. ...................... .. 5-25
SNALinkJ3270 Software Drawer
... . ......................... . .. 5-25
Removal and Replacement
Introduction . .. .. ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Disconnecting the Battery .
............... . .... .... . . .. . ........... 6-1
Removing the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-4
Separating the Case
..... . . .. . ............. . . . .. ... ..... . ...... . .. 6-5
Replacing the PCAs
... . ............... .. .. .. ........ . ....... . .... 6-7
Removing the Keyboard Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 6-9
Removing a Keyswitch
..... ... ... ..... ..... . . . ... ... .. ... ........ 6-10
Removing the Display Module . . . .
............... .. . . ..... ..... ... 6-11
Removing the Clutches and Display Cable
.. . ... .. .. . . . .. . ...... . . . . 6-13
Removing ICs . .
.............. . ............ .. . . .... . ......... . .. 6 -1 7
Replacing Plug-In Drawer PCAs
.................... . .............. 6-18
Adjustments
Troubleshooting
Overview ..... . ....... . ... . . . . ....... . ..... . ...... . ...... . .. . ... 8-1
Troubleshooting Procedures
.......... .. ..... .......... ........ . .... 8-3
Main Diagnostic Procedure
......... . .... .. ..... ............ . .... 8-4
Repair Procedures
........ . . . ....... . . ........ ..... . . ...... . ... 8-15
Using Oscilloscope Routines ... ... .. .. .. ... . ... . . .. . . . . .... . .. . . .. 8-33
Diagnostic Module Scope Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-34
Disc-Based Scope
Routines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-36
Burning
an EPROM ......... . ............................. . ..... 8-38
Testing the Recharger
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-40
Testing the SNALinkJ3270 Software Drawer .................. . ..... 8-42
Replaceable Parts
Reference
Information
Introduction ................. .. ........ . .. . .... . ............... .
Diagnostic
Test Results .... . .. . .......... . . . ..................... .
Descriptions of Diagnostic Tests . .
........ . .... . . .. ... .. ........ . . .
System
Test . .............. .. ... . ........... .. ... . ........ .. . .
CPU Test . . ......... . .............. .. ...... . .... . ........... .
ROM Test
RAM Test
LCD Test
............ .. ... . ........ .. .... .... ....... . ..... .. .
..
.. . ..... ... ......... .... . ................ . ........
.. .. . .. . ..... ...... .... ..... ........................
Keyboard Test . . . ... . .. .. . . ......... . ............ . ... ....... . .
HP-IL Test
.............. . ......... .. ...................... .. .
Modem
Test
... .. .......... .... ......... . ........ . ............
RS-232-C Test ............ . ........... . ...... . ............... .
Beeper Test
....... . ....................... . . . .. . ............. .
10-1
10-1
10-7
10-7
10-7
10-7
10-7
10-8
10-8
10-8
10-9
10-9
10-9
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