IBM 8543 User manual

Model L40 SX (8543)

General Checkout . . . . . . . . . . . . . . . . . 24

Memory Checkout . . . . . . . . . . . . . . . 25

Power Systems Checkout ........... 27

Symptom-to-FRU Index . . . . . . . . . . . . . . 32

Undetermined Problem . . . . . . . . . . . . . 36

Related Service Procedures ............ 37

Checking Installed Devices ........... 37

Power-on Password . . . . . . . . . . . . . . 37

How to Run Advanced Diagnostics ....... 37

Product Overview . . . . . . . . . . . . . . . . . 38

FRU Removals and Replacements ......... 39

Locations . . . . . . . . . . . . . . . . . . . . . 42

Parts Listing . . . . . . . . . . . . . . . . . . . 43

 Copyright IBM Corp. 1995 23

General Checkout

001

DOES THE POWER SOURCE APPEAR TO BE OK?

Yes No

002

Go to “Power Systems Checkout” on page 27.

003

– Power-off the computer and all external devices.

– Insert the backup copy of the Advanced Diagnostics

diskette into the diskette drive.

– Power-on the computer and check for the following

responses:

1. All icons on the system-status display appear once

for about 1 second.

Note: Some icons remain on after 1 second.

2. Memory counts.

3. One or two short beeps

4. The Speaker icon starts blinking and continues

blinking until any key is pressed.

5. The IBM Logo is displayed on the screen.

DID YOU RECEIVE THE CORRECT RESPONSES?

Yes No

004

Go to “Symptom-to-FRU Index” on page 32.

005

– Advance to the Main Menu.

– Press Ctrl+A, then type 0 to run the tests.

DID YOU RECEIVE AN ERROR MESSAGE OR ERROR

CODE?

Yes No

006

The diagnostic tests have completed without

detecting an error.

007

Go to “Symptom-to-FRU Index” on page 32.

24 IBM Mobile Systems HMM - Volume 1

Memory Checkout

Notes:

1. Power-off the computer before removing or replacing

any parts.

2. Run AUTOMATIC CONFIGURATION after removing

or replacing memory modules. (If you have to run

configuration with your own diskette, be sure the

customer has all the correct option diskettes

available.)

3. Disregard 164 Memory-Size Errors.

(Model L40 does not work with the combination of two

4MB memory modules installed.)

001

– Remove the memory module kits in connectors 1 and 2

if installed. Note which memory module kit is in

connector 1.

– Run the memory tests.

Use the RUN TESTS ONE TIME option.

DID THE MEMORY TESTS END WITHOUT AN ERROR?

Yes No

002

Replace the system board.

003

DID YOU REMOVE THE MEMORY MODULE KIT IN

CONNECTOR 1?

Yes No

004

Go to Step 007.

005

– Reinstall the memory module in connector 1.

– Run the memory test.

Use the RUN TESTS ONE TIME option.

DID THE MEMORY TESTS END WITHOUT AN ERROR?

Yes No

006

Replace the memory module in connector 1.

If that does not correct the problem, replace the

system board.

007

(Step 007 continues)

Model L40 SX (8543) 25

(CONTINUED)

007 (continued)

DID YOU REMOVE THE MEMORY MODULE KIT IN

CONNECTOR 2?

Yes No

008

Go to Step 011.

009

– Reinstall the memory module in connector 2.

– Run the memory test.

Use the RUN TESTS ONE TIME option.

DID THE MEMORY TESTS END WITHOUT AN ERROR?

Yes No

010

Replace the memory module in connector 2.

If that does not correct the problem, replace the

system board.

011

Check if the actual memory size of the memory module is

different from the displayed memory size on the screen. If

the problem occurs intermittently, run the memory tests

multiple times to have an error log.

26 IBM Mobile Systems HMM - Volume 1

Power Systems Checkout

Note

One or all of the batteries can discharge if there is a

short circuit in the computer.

1. Replace the failing FRU if the power supply problem

is caused by a short circuit.

2. Determine if one (or all) of the batteries have become

discharged. Replace a discharged battery with a

known-good spare (or recharge the main or standby

battery.)

The test procedures for each power supply are found on

the following pages.

“Testing the AC Adapter” on page 29.

“Testing the Rechargeable Battery” on page 29.

“Testing the Backup Battery” on page 30.

“Testing the Standby Battery” on page 30.

“Testing the Quick Charger” on page 31.

None of the above? Follow the steps below.

001

DID THE PROBLEM OCCUR ONLY WHEN USING THE

AC ADAPTER?

Yes No

002

Go to Step 004.

003

Go to “Testing the AC Adapter” on page 29. If that does

not correct the problem, replace the system board.

004

DID THE PROBLEM OCCUR ONLY WHEN USING THE

BATTERY?

Yes No

005

Go to Step 011 on page 28.

006

DOES A FULLY-CHARGED BATTERY DISCHARGE

QUICKLY?

Yes No

007

Go to Step 010 on page 28.

Model L40 SX (8543) 27

(CONTINUED)

008

– Run advanced diagnostics for all devices using the AC

adapter. Use the ‘RUN TEST ONE TIME’ option.

DID ALL THE TESTS END WITHOUT AN ERROR?

Yes No

009

Follow the instructions on the screen.

If the instructions do not appear or do not correct the

problem, replace the system board.

010

Go to “Testing the Rechargeable Battery” on page 29. If

that does not correct the problem, replace the system

board.

011

– Remove the following if installed:

Rechargeable battery

Standby battery

Backup battery

Memory module kits in connectors 1 and 2

Internal Data/Fax Modem adapter

Serial adapter

Numeric keypad

TrackPoint

Mouse

External keyboard

External CRT display

Cables to the hard disk drive

Cables to the diskette drive

Power cable to the LCD

Signal cables to the LCD

– Connect the AC adapter and power-on the computer.

DID YOU HEAR ONE LONG OR TWO SHORT BEEPS?

Yes No

012

Replace the system-status display to verify the fix. If

the problem still remains, put back the original

system-status display, then replace the system

board.

013

– Suspect one of the options or devices. Reinstall each of

the options or devices to the computer one at a time,

and power-on the computer to see if the original problem

occurs.

(Step 013 continues)

28 IBM Mobile Systems HMM - Volume 1

013 (continued)

– Replace the last installed option or device when the

problem occurs.

Testing the AC Adapter

1. If a noise can be heard from the AC adapter when it

is plugged into line voltage, replace the AC adapter.

If a noise still comes from the AC adapter, suspect

the computer.

If not, the AC adapter has a problem. Replace the

AC adapter with the original one, then go to the next

step.

2. Measure the output voltage at the plug of the AC

adapter cable.

If the voltage is not correct, replace the AC adapter.

Testing the Rechargeable Battery

1. Remove the keyboard.

2. Set the rechargeable battery in place without

connecting any external power devices.

3. Measure the voltage between terminals 1 (+) and 2

(−) and note the voltage.

1(+)

4. Using the AC adapter, apply external power to the

computer. Make sure that a charge arrow appears in

the system-status display.

5. Measure the voltage again between terminals

1 (+) and 2 (−).

If the voltage is not greater than the one measured in

Step 3, replace the AC adapter. If the voltage is

greater than the one measured in Step 3, go to the

next step.

Pin Voltage (V dc)

1+14.3 to +15.8

2 Ground

Model L40 SX (8543) 29

6. Remove the rechargeable battery from the computer.

7. Measure the voltage at the battery terminals.

3( )

2(T)

1(+)

If the voltage is not correct, the rechargeable battery

is discharged or defective. If the voltage is correct,

go to the next step.

8. Using a low-power ohm meter, measure the

resistance at the battery terminals between

2 (T) and 3 (−). The resistance must be

4 kilohms to 30 kilohms.

If the resistance is out of range, replace the

rechargeable battery.

Testing the Backup Battery

1. Remove the keyboard and the top cover.

2. Measure the voltage at the connectors of the backup

battery.

If the voltage is not correct, the backup battery is

discharged by a short circuit or is defective.

Testing the Standby Battery

Note: The charging time required is 48 hours.

1. Remove the keyboard and the top cover.

2. Connect the AC adapter to the computer.

Pin Voltage (V dc)

1+8.5 to +12.6

3 Ground

Pin Voltage (V dc)

1+2.8 to +3.2

2 Ground

30 IBM Mobile Systems HMM - Volume 1

3. Disconnect the standby battery connector from the

system board and measure the voltage at the

connector of the standby battery as shown.

2(Red)

(Black)

If the voltage is correct, perform the failing operation

with a fully-charged standby battery to isolate the

problem.

If the voltage is not correct, continue.

4. Measure the output voltage at the connector on the

system board.

(Top View)

(-) (+)

If the voltage is higher than measured in Step 3, the

standby battery is discharged or is defective.

If the voltage is the same as measured in Step 3 or

less than +3.0 V dc, replace the standby battery. If

the problem remains, replace the system board.

Testing the Quick Charger: If a noise can be

heard from the operating quick charger, replace it.

1. Perform steps 6 through 8 on page 30 of the “Testing

the Rechargeable Battery” to verify the rechargeable

battery for correct operation.

2. Plug the quick charger into an electrical outlet.

If the amber power indicator does not turn on, replace

the quick charger.

3. Install the rechargeable battery.

If the green charging indicator is not blinking, replace

the quick charger.

Pin Voltage (V dc)

1+3.0 to +4.5

2 Ground

Model L40 SX (8543) 31

Symptom-to-FRU Index

The Symptom-to-FRU Index lists symptoms and errors and

the possible causes. The most likely cause is listed first.

If the computer displays an error message, first replace

FRUs listed in the error message. An

in an error

message can be any number.

Note: If you have an IBM device with its own service

manual or a device not supported by the advanced

diagnostics tests, refer to the manual for that

device.

Symptom/Error FRU/Action

One or more keys do not

work.

(See “External

Keyboard/Auxiliary Input

Device Checkout” on

page 465 before replacing

any FRUs.)

1. Keyboard

2. System Board

No beep and a blank or

unreadable display during

POST.

(See “Power Systems

Checkout” on page 27

before replacing any FRUs.)

1. System Board

2. Any options or devices

3. Power source when

failing

4. Speaker

No beep with a normal

display during POST. 1. Speaker

2. System Board

Continuous beep 1. System Board

2. Any options or devices

Repeating short beeps.

(See “External

Keyboard/Auxiliary Input

Device Checkout” on

page 465 before replacing

any FRUs.)

1. System Board

2. Keyboard

Dew Point or Temperature

icon appears with one long

and one short beep.

1. System Board

2. Power source when

failing

One long and one short

beep. 1. System Board

2. Power source when

failing

One long and two short

beeps. 1. System Board

2. Power source when

failing

One short beep and a

blank, unreadable, or

flashing display with no

external display attached.

1. Display (LCD)

2. System Board

3. Power source when

failing

One short beep and

Diskette Prompt or a

program load from the hard

disk drive or unable to read

diskette(s).

1. Diskette Drive

2. System Board

3. Diskette Drive Cable

32 IBM Mobile Systems HMM - Volume 1

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