Toshiba Libretto 50CT/70CT Manual

2-iiLibretto 50CT/70CT Maintenance Manual 

Libretto 50CT/70CT Maintenance Manual2-iiiTable of Contents2.1  Troubleshooting Overview...........................................................................................2-1
2.2  Troubleshooting Flowchart..........................................................................................2-2
2.3  Power Supply Troubleshooting....................................................................................2-5
Procedure 1  Power Status...

2-ivLibretto 50CT/70CT Maintenance ManualFigures
Figure 2-1  Troubleshooting flowchart (1/2).......................................................................2-3
Figure 2-2  Printer port LED............................................................................................2-12
Figure 2-3 Cable connection diagram................................................................................2-16
Tables
Table 2-1  Battery...

2  Troubleshooting Procedures2.1  Troubleshooting OverviewLibretto 50CT/70CT Maintenance Manual2-12 
2.1 Troubleshooting OverviewChapter 2 describes how to determine if a Field Replaceable Unit (FRU) is causing the
computer to malfunction.  The FRUs covered are:· Power Supply· Floppy Disk Drive· Pointing Device
· System Board· Hard Disk Drive· Display
· FL Inverter Board· Keyboard
The Tests and Diagnostics are described in Chapter 3 and Replacement Procedures are
detailed in Chapter 4.
The following...

2.2  Troubleshooting Flowchart2  Troubleshooting Procedures2-2Libretto 50CT/70CT Maintenance Manual2.2 Troubleshooting FlowchartUse the flowchart in figure 2-1 as a guide to determine which troubleshooting procedures to
execute.  Before going through the flowchart steps, do the following:q Verify with the customer that Toshiba Windows 95 is installed on the hard disk. Non-
Toshiba operating systems can cause the computer to malfunction.
q Make sure all optional equipment is removed from the computer.
q...

2  Troubleshooting Procedures2.2  Troubleshooting FlowchartLibretto 50CT/70CT Maintenance Manual2-3Figure 2-1  Troubleshooting flowchart (1/2) 

2.2  Troubleshooting Flowchart2  Troubleshooting Procedures2-4Libretto 50CT/70CT Maintenance ManualFigure 2-1  Troubleshooting flowchart (2/2)
If the diagnostics program cannot detect an error, the problem may be intermittent.  The
Running Test program should be executed several times to isolate the problem.
Check the Log Utilities function to confirm which diagnostic test detected an error(s), then
perform the appropriate troubleshooting procedures as follows:
1. If an error is detected on the system...

2  Troubleshooting Procedures2.3  Power Supply TroubleshootingLibretto 50CT/70CT Maintenance Manual2-52.3 Power Supply Troubleshooting 
The power supply controls many functions and components. To determine if the power supply
is functioning properly, start with Procedure 1 and continue with the other Procedures as
instructed.  The procedures described in this section are:
Procedure 1:Power Status Check
Procedure 2:Error Code Check
Procedure 3:Connection Check
Procedure 4:Replacement Check
Procedure...

2.3  Power Supply Troubleshooting2  Troubleshooting Procedures2-6Libretto 50CT/70CT Maintenance ManualTo check the power supply status, install a battery pack and connect an AC adapter.
Check 1If the DC IN icon flashes orange, go to Procedure 2.
Check 2If the DC IN icon does not light, go to Procedure 3.
Check 3If the Battery icon does not light orange or green, go to Procedure 4.
CAUTION: Use only an AC adapter that is manufactured specifically for the Libretto50CT/70CT. If you use a different AC...

2  Troubleshooting Procedures2.3  Power Supply TroubleshootingLibretto 50CT/70CT Maintenance Manual2-7q Battery pack
Error codeMeaning10hBattery voltage is over the limit11hBattery charge current is over the limit12hBattery discharge current is over the maximum allowed
limit when there is no load13hBattery voltage is under the limitq B5V,VCC output
Error codeMeaning20hVCC voltage is over the limit21hVCC voltage is under the limit22hVCC does not start up when power supply is turned onq B3V output
Error...