HP Portable PLUS - Table of Contents

•
Chapter
1
1.1
1.3
1.5
1.5
1.6
Contents
General Information
Description .... . ......... . ...... . ........... . ..... . ..... ... ..... .
Specifications
.. .... .... .... .. . .. . .. ..... . ... . . . .. .. .... . .. . . .... .
Identification
.... .. ... . ......... . .. .... ...... ... .... ...... ... ....
Accessories
...... . .... .. ... .. ... ..... .. ... .. ..... .... .. ... . ..... .
Test Equipment .. . . . ... . .. . ... . .............. . ... . ...... . ....... .
Page
1-1
1-3
1-5
1-5
1-6
2 Site Preparation Requirements
3
Installation and Configuration
3.1 Preparation ...... . .. .. ..... . ........ .. ... . ...................... 3-1
3.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 3-1
3.3 Functional Verification
.......... .. . . .. .. ........ .. .. ... .... .... ... 3-2
3.4
Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
4 Preventive Maintenance
5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
5.15.1
5.15.2
5.15.3
5.15.4
5.15.5
5.15.6
5.15.7
5.15.8
5.15.9
5.15.10
5.15.11
5.15.12
Functional Description
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-1
Central Processing
Unit (CPU) . . . ... . . . .... .. .. . ... . .. . ..... . ...... 5-3
Peripheral Processing
Unit (PPU) ....... .. .. . ... ... . ... . .. . .. . .... .. 5-4
Address/Control Circuit .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-5
Keyboard Interface .
.............. . . . ... .. .......... . ...... . . .. ... 5-5
Keyboard Assembly . .
.. .. .... . .. . .. . .... . .. . ........ . ... . . .. . . .. . 5-6
Liquid-Crystal (LCD) Interface
.. . ...... . . . ........... . . . .......... . 5-6
Liquid-Crystal Display
.. ...... .. .. .. .... . . .. ....... . . ... ... . .. . .. . 5-6
HP-IL Interface
... ........ . ...... .. .. .. . .... . .. . . ..... .. . . .. . .... 5-7
Serial (RS-232-C) Interface
.. . ..... . .. .. ... .. .... . .......... . .... . . 5-7
Video Interface
.. . .. . .... .. ........ . .. . .. .. . .. . ....... . ..... .. .. . 5-8
Modem Interface
.. . .. . ..... . .. . ... . .... . . . . . . . . . . . . . . . . . . . . . . . . .. 5-9
Direct-Connect Modem (Dealer-Installed Option)
... . ... . . .. ... .. ..... . 5-9
Clock/Ready Circuit
.. .. ....... .. .. . .. . ............... .. .... . ... . 5-12
Power Supply
.. . ...... . .. . ... . . .. . . . .. .......... .. .... . .. . .... . 5-13
VCC Voltage Regulator
...... ... .. .. ... . .. .. .. . .. . ........ .. .... 5- 13
Battery ...... . ......... . ....... . . .. . . ................. . . ... .. 5-15
Battery Charger .
.. .. . .... . . . .. . ..... .... .................... .. 5-15
Power-Up Routine . . . . .......... . . . .. . .... . ... . ....... .. . . ... .. 5-18
LCD Negative Supply
... .. ..... .. . . ................. . .. . . . ..... 5-19
VLCD Switch Circuit
.. . ... ... . ......... .. . . ............. .. .. .. 5-20
VFETBIAS Supply Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
Variable Control of the VFETBIAS Supply ...... . .... . . ... .. .. ... . 5-20
Miscellaneous LCD Negative Supply Circuitry .................... . 5-21
RS-232-C Supply Voltages
.... . .......... . ..... . ... . ... ... .... .. 5-22
Voltage Doublers
.... .. ....... .. .. . ..... ... ..... . ........ . .. .. . 5-22
11-kHz Oscillator
................... . .................. . ..... . 5-23
....