Compaq Compaq 486 Manual

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SLT is a trademark of Compaq Computer Corporation.

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MAINTENANCE AND SERVICE GUIDE

COMPAQ PORTABLE 486c Personal Computer

First Edition (October 1991)

Text Number 128987-001

Chapter 1. Specifications

Introduction

This chapter provides physical, environmental, and performance specifications

for the following COMPAQ PORTABLE 486c Personal Computer subsystems:

o System Unit

o Full Function 101/102 Key Keyboard

o Active Matrix Color VGA Display

o Power Supply

o 3 1/2 inch 1.44 Megabyte Diskette Drive

o 210 and 120 Megabyte Fixed Disk Drives

Chapter 1.1 System Unit

=============================================================================

U.S. Other

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

Dimensions

Height 11.0 inch 27.9 cm

Width 15.6 inch 39.6 cm

Depth 5.5 inch 13.9 cm

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Weight (with keyboard)

Model 210 17.6 lb 7.9 kg

Model 120 17.6 lb 7.9 kg

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Environmental Requirements

Temperature

Operating 50oF to 104oF 10oC to 40oC

Nonoperating -22oF to 140oF -30oC to 60oC

Relative Humidity (noncondensing)

Operating 20% to 80% 20% to 80%

Nonoperating 5% to 90% 5% to 90%

Maximum Unpressurized

Altitude

Operating 10,000 ft 3,050 m

Nonoperating 30,000 ft 9,150 m

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Cooling 12 VDC fan 12 VDC fan

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

Shock 40g, 11 ms, half sine

(nonoperating)

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

Vibration

Operating 0.25g, 5 to 500 Hz,

1/2 octave/min sweep

Nonoperating 1.0g, 5 to 500 Hz,

1/2 octave/min sweep

=============================================================================

Chapter 1.2 Keyboard

=============================================================================

English Other

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

Dimensions

Height 1.2 inch 3.0 cm

Depth 7.4 inch 18.7 cm

Width 15.7 inch 39.8 cm

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Weight 2.65 lb 1.2 kg

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Number of Keys 101 102

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

Cable

Compressed 24.0 inch 60.9 cm

Extended 46.5 inch 118.1 cm

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

Interface 6 pin mini DIN 6 pin mini DIN

connector connector

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

Power

Volts 4.5 to 5.5 VDC 4.5 to 5.5 VDC

Current 300 mA 300 mA

=============================================================================

Chapter 1.3 Active Matrix Color Display

=============================================================================

U.S. Other

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

Dimensions (viewing area)

Height 6.2 inch 15.8 cm

Width 8.3 inch 21.1 cm

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Diagonal Size 10.4 inch 26.4 cm

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Mounting Internal Internal

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Tilt Angle -5oF to 32oF -5oC to 32oC

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Display Active Matrix Active Matrix

Color VGA, TFT Color VGA, TFT

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Color Capability 256, 16 shades 256, 16 shades

per primary color per primary color

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

Brightness Adjustable Adjustable

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

Maximum Pixel Resolution

(Text and Graphics) 640 x 480 640 x 480

640 x 400 640 x 400

640 x 350 640 x 350

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

Operating Frequency 25 MHz 25 MHz

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

VDC Input

Nominal Voltage 5 VDC 12 VDC

Current Maximum 150 mA 420 mA

Power Maximum 0.75W 5.04W

==============================================================================

Chapter 1.4 Power Supply

=============================================================================

U.S. Other

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

Input Requirements

Nominal Voltage 120 VAC 240 VAC

Maximum Range Voltage 100 to 120 VAC 220 to 240 VAC

Line Frequency 60 Hz 50 Hz

Current 4A 2A

Fuse 5A 5A

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Operating Power 125W * 125W *

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Line Voltage Switching Automatic Automatic

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

Cooling 2 speed fan, 2 speed fan,

thermostatically thermostatically

controlled controlled

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Operating Temperature 41oF to 104oF 5oC to 40oC

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

VDC Output

Nominal Voltage 5V 12V -12V

Current Minimum 1.5A 0.1A 0A

Current Maximum 12A 4.2A 1A

Maximum Peak Current 18A 6A 1A

Regulation Tolerance 3% 5% 5%

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

NOTE: These values are maximum values based on nominal operating conditions

for temperature, line voltage, frequency, and altitude.

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

* 60W maximum available through EISA expansion slots.

=============================================================================

Chapter 1.5 Diskette Drive

=============================================================================

1.44 MB

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

Diskette Size 3 1/2 inch

Capacity Per Diskette

(high/low) 1.44 MB/720 KB

LED Indicators

Read/Write (high density) Green

Read/Write (low density) Orange

Drives Supported One

Drive Height 0.75 inch (1.9 cm)

Drive Rotation (rpm) 300

Transfer Rate (bps)

(high/low) 500K/250K

Bytes Per Sector 512

Sectors Per Track

(high/low) 18/9

Tracks Per Side

(high/low) 80/80

Access Times

Track to Track 3 ms

Average 80 ms

Settling Time 15 ms

Latency Average 100 ms

Cylinders (high/low) 80/80

Read/Write Heads 2

=============================================================================

Chapter 1.6 Fixed Disk Drives

=============================================================================

210 MB 120 MB

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

Standard Configurations Model 210 Model 120

Formatted Capacity 212.6 MB 121.5 MB

Drives Supported One One

Form Factor 3 1/2 inch 3 1/2 inch

Drive Height 1 inch 1 inch

Drive Weight 1.3 lb 1.3 lb

Drive Type (logical) 51 50

Drive Speed 4500 rpm 3399 rpm

Transfer Rate (per second)

Head 20 MB 12 MB

Buffer (max) 5 MB 4.5 MB

Sector Interleave 1:1 1:1

Seek Times

Track to Track 3 ms 8 ms

Average 12 ms 19 ms

Maximum 30 ms 35 ms

Cylinders

Physical 2119 1522

Logical 683 760

Read/Write Heads

Physical 4 4

Logical 16 8

Sectors Per Track

Physical 49 40

Logical 38 + 1 spare 39 + 1 spare

Bytes Per Sector 512 512

=============================================================================

Chapter 2. Power On Self Test (POST)

Introduction

This chapter lists the subassemblies checked by the Power On Self Test (POST)

and briefly describes the types of error codes that can occur. The chapter

also includes problem isolation procedures and a flowchart for quick

reference.

Chapter 2.1 POST

POST is a series of diagnostic tests that runs automatically on the COMPAQ

PORTABLE 486c Personal Computer when it is turned on.

POST checks the following subassemblies to ensure that the computer system is

functioning properly:

o Processor Board

o Memory Module

o Keyboard

o Controller Circuitry

o Video Circuitry

o Fixed Disk Drive

o Diskette Drive

If POST finds an error in the computer, an error condition is indicated by an

audible and/or visual message. See Chapter 3, "Error Messages and Codes,"

for an explanation of the error codes and a recommended course of action.

Chapter 2.2 Preliminary Steps

If you encounter an error condition, complete the following steps before

starting the problem isolation procedures:

1. Turn off power to the computer.

2. Disconnect any external devices. Do not disconnect the printer if you

want to test the printer or use it to log error messages.

3. Install all appropriate loopback plugs and terminating plugs for complete

testing.

4. Clear the power on password, if it is preset by the user. You will know

that the power on password is set when a key icon (0--m) appears on the

screen when POST completes. If this occurs, you must enter the password

to continue.

If you do not have access to the password, you must disable the power on

password feature by setting the power on password switch (see section

2.3, "Clearing Power on Password").

5. Access the fixed disk drive.

You will know that the fixed disk drive password is set when the

DriveLock icon (see illustration of DriveLock icon below) appears on the

screen. If this occurs, you must enter the fixed disk drive password to

continue.

IMPORTANT: It is not necessary to access the fixed disk drive in order to run

the Diagnostics diskette; however, complete system testing cannot be done

without access to the complete system.

The user must clear the fixed disk drive password or give you access

before servicing can be performed.

6. Position the brightness and volume controls approximately in the center

of their range.

7. Insert the Diagnostics diskette into drive A.

8. Turn on the computer.

9. Follow the procedures of the Problem Isolation Flowchart, section 2.4.

Refer to Chapter 3, "Error Messages and Codes," for detailed information

on problem isolation.

Chapter 2.3 Clearing Power On Password

To clear the power on password feature, reset the power on password switch

(SW5) located on the I/O board. To do so, complete the following steps:

1. Disconnect the AC power.

2. Disassemble the computer to reach the I/O board (refer to Chapter 5).

3. Locate the power on password switch (SW5) on the I/O board; set the

switch to ON (Figure 2-1).

4. Reconnect AC power.

5. Turn on the computer and allow it to complete POST.

6. Turn the computer off.

7. Set switch SW5 to OFF.

8. Disconnect AC power.

9. Reassemble the computer (refer to Chapter 5).

10. Reconnect the AC power.

11. Turn on the computer and allow it to complete POST. If the key icon

(o--m) does not appear when POST completes, the power on password has

been cleared.

Chapter 2.4 Problem Isolation Flowchart

The problem isolation flowchart provides a quick reference for identifying

and correcting problems that may occur during POST. The flowchart gives

troubleshooting procedures for identifying malfunctions. It also directs you

to the Diagnostics chapter in the SUPPORT SOFTWARE MAINTENANCE AND SERVICE

GUIDE and to Chapter 3, "Error Messages and Codes," for more detailed

troubleshooting information.

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