IBM 8543, L40 SX Service 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.
1
2
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.
1
2
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
Loading...