User Guide
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..." contains general information that is not observed. q If you replace the battery pack, RTC battery, or backup battery, be italicized and identified as shown below. Information added that relates to perform hardware service maintenance for the Toshiba Personal Computer Libretto 50CT/70CT. ii Libretto 50CT/70CT Maintenance Manual CAUTION: "Caution" indicates the existence of these messages will be...
..." contains general information that is not observed. q If you replace the battery pack, RTC battery, or backup battery, be italicized and identified as shown below. Information added that relates to perform hardware service maintenance for the Toshiba Personal Computer Libretto 50CT/70CT. ii Libretto 50CT/70CT Maintenance Manual CAUTION: "Caution" indicates the existence of these messages will be...
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......1-1 1.2 System Unit Block Diagram 1-4 1.3 3.5-inch External FDD (Option 1-7 1.4 2.5-inch HDD ...1-8 1.5 Keyboard ...1-9 1.6 LCD Panel ...1-10 1.7 Power Supply ...1-12 1.8 Batteries ...1-13 Chapter 2 Troubleshooting Procedures 2.1 Troubleshooting Overview 2-1 2.2 Troubleshooting Flowchart 2-2 2.3 Power Supply Troubleshooting 2-5 2.4 System Board Troubleshooting 2-10 2.5 Floppy Disk Drive (FDD) Troubleshooting ......3-9 3.5 Memory Test ...3-10 3.6 Keyboard Test ...3-12 3.7 Display Test...3-14 3.8 Floppy Disk Test 3-17 3.9 Printer Test...3-20 Libretto 50CT/70CT Maintenance Manual v
......1-1 1.2 System Unit Block Diagram 1-4 1.3 3.5-inch External FDD (Option 1-7 1.4 2.5-inch HDD ...1-8 1.5 Keyboard ...1-9 1.6 LCD Panel ...1-10 1.7 Power Supply ...1-12 1.8 Batteries ...1-13 Chapter 2 Troubleshooting Procedures 2.1 Troubleshooting Overview 2-1 2.2 Troubleshooting Flowchart 2-2 2.3 Power Supply Troubleshooting 2-5 2.4 System Board Troubleshooting 2-10 2.5 Floppy Disk Drive (FDD) Troubleshooting ......3-9 3.5 Memory Test ...3-10 3.6 Keyboard Test ...3-12 3.7 Display Test...3-14 3.8 Floppy Disk Test 3-17 3.9 Printer Test...3-20 Libretto 50CT/70CT Maintenance Manual v
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...44 3.22 Floppy Disk Drive Utilities 3-45 3.23 System Configuration 3-49 3.24 SETUP ...3-50 Chapter 4 Replacement Procedures 4.1 Overview ...4-1 4.2 Battery Pack ...4-6 4.3 Optional PC Card...4-8 4.4 Hard Disk Drive (HDD 4-10 4.5 Optional Memory Module 4-12 4.6 Keyboard ...4-14 4.7 Display Assembly 4-16 4.8 RTC... Battery ...4-19 4.9 System Board ...4-20 4.10 Display Mask ...4-21 4.11 FL Inverter Board 4-23 4.12 LCD Module ...4-25 4.13 Power Switch ...
...44 3.22 Floppy Disk Drive Utilities 3-45 3.23 System Configuration 3-49 3.24 SETUP ...3-50 Chapter 4 Replacement Procedures 4.1 Overview ...4-1 4.2 Battery Pack ...4-6 4.3 Optional PC Card...4-8 4.4 Hard Disk Drive (HDD 4-10 4.5 Optional Memory Module 4-12 4.6 Keyboard ...4-14 4.7 Display Assembly 4-16 4.8 RTC... Battery ...4-19 4.9 System Board ...4-20 4.10 Display Mask ...4-21 4.11 FL Inverter Board 4-23 4.12 LCD Module ...4-25 4.13 Power Switch ...
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... 1.8.2 Battery Icon 1-13 1.8.3 Battery Charging Control 1-13 1.8.4 RTC battery 1-14 Figures Figure 1-1 Front of the computer 1-3 Figure 1-2 System unit configuration 1-3 Figure 1-3 System unit block diagram 1-4 Figure 1-4 3.5-inch FDD 1-7 Figure 1-5 2.5-inch HDD 1-8 Figure 1-6 Keyboard...1-9 Figure 1-7 LCD module 1-10 Tables Table 1-1 FDD specifications 1-7 Table 1-2 HDD specifications 1-8 Table 1-3 Keyboard specifications 1-9 Table 1-4 LCD specifications 1-10 Libretto 50CT/70CT Maintenance...
... 1.8.2 Battery Icon 1-13 1.8.3 Battery Charging Control 1-13 1.8.4 RTC battery 1-14 Figures Figure 1-1 Front of the computer 1-3 Figure 1-2 System unit configuration 1-3 Figure 1-3 System unit block diagram 1-4 Figure 1-4 3.5-inch FDD 1-7 Figure 1-5 2.5-inch HDD 1-8 Figure 1-6 Keyboard...1-9 Figure 1-7 LCD module 1-10 Tables Table 1-1 FDD specifications 1-7 Table 1-2 HDD specifications 1-8 Table 1-3 Keyboard specifications 1-9 Table 1-4 LCD specifications 1-10 Libretto 50CT/70CT Maintenance...
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Table 1-5 FL inverter board specifications 1-11 Table 1-6 Power supply board output rating 1-12 Table 1-7 Battery specifications 1-13 Table 1-8 Time required for quick charge 1-14 Table 1-9 RTC battery charging/data preservation time 1-14 1-iv Libretto 50CT/70CT Maintenance Manual
Table 1-5 FL inverter board specifications 1-11 Table 1-6 Power supply board output rating 1-12 Table 1-7 Battery specifications 1-13 Table 1-8 Time required for quick charge 1-14 Table 1-9 RTC battery charging/data preservation time 1-14 1-iv Libretto 50CT/70CT Maintenance Manual
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... Hard Disk Drive (HDD) The Libretto 50CT has a 2.5-inch HDD with a capacity of 815MB. ∗The Libretto 70CT has a 2.5-inch HDD with MMX technology running at a clock speed of 1.58GB. q Batteries Two batteries: a Lithium-Ion main battery pack and RTC battery that enables a display of 1280 ... Standard 16MB of 640 x 480 pixels. or 102-key enhanced keyboard. 1 Hardware Overview 1.1 Features 1 1.1 Features The Libretto 50CT/70CT uses Toshiba's advanced Large Scale Integration (LSI) and Complementary Metal-Oxide Semiconductor (CMOS) technology extensively to -use 80/82-key keyboard ...
... Hard Disk Drive (HDD) The Libretto 50CT has a 2.5-inch HDD with a capacity of 815MB. ∗The Libretto 70CT has a 2.5-inch HDD with MMX technology running at a clock speed of 1.58GB. q Batteries Two batteries: a Lithium-Ion main battery pack and RTC battery that enables a display of 1280 ... Standard 16MB of 640 x 480 pixels. or 102-key enhanced keyboard. 1 Hardware Overview 1.1 Features 1 1.1 Features The Libretto 50CT/70CT uses Toshiba's advanced Large Scale Integration (LSI) and Complementary Metal-Oxide Semiconductor (CMOS) technology extensively to -use 80/82-key keyboard ...
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...at 2 MHz, and performs the following functions: 1. Detects a fully charged Main Battery Pack. 5. 1.7 Power Supply 1 Hardware Overview 1.7 Power Supply The power supply provides two kinds of a low Main Battery Pack. 7. Provides more accurate detection of voltages to the computer. 2. Table ...1-6 Power supply board output rating Use CPU, RAM, GA, VGA, VRAM GA, BIOS ROM, KBC, PC card Name B3V VCC DC voltage (V) +3.3 +12.0 Regulation tolerance (%) ±5 ±5 1-14 Libretto 50CT/70CT...
...at 2 MHz, and performs the following functions: 1. Detects a fully charged Main Battery Pack. 5. 1.7 Power Supply 1 Hardware Overview 1.7 Power Supply The power supply provides two kinds of a low Main Battery Pack. 7. Provides more accurate detection of voltages to the computer. 2. Table ...1-6 Power supply board output rating Use CPU, RAM, GA, VGA, VRAM GA, BIOS ROM, KBC, PC card Name B3V VCC DC voltage (V) +3.3 +12.0 Regulation tolerance (%) ±5 ±5 1-14 Libretto 50CT/70CT...
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... microprocessor mounted on the system board controls whether the battery charge is not connected. Libretto 50CT/70CT Maintenance Manual 1-15 Table 1-7 Battery specifications Battery name Main battery pack RTC battery Material Lithium-Ion Nickel Metal Hydride Output voltage 10.8 V 2.4 V Capacity 1,200 mAh 11 mAh 1.8.1 Main Battery Pack The removable main battery pack is the computer's main power source when...
... microprocessor mounted on the system board controls whether the battery charge is not connected. Libretto 50CT/70CT Maintenance Manual 1-15 Table 1-7 Battery specifications Battery name Main battery pack RTC battery Material Lithium-Ion Nickel Metal Hydride Output voltage 10.8 V 2.4 V Capacity 1,200 mAh 11 mAh 1.8.1 Main Battery Pack The removable main battery pack is the computer's main power source when...
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... time Item Charging Time Data preservation period (full charge) Time 48 hours About 1 month 1-16 Libretto 50CT/70CT Maintenance Manual 1.8 Batteries 1 Hardware Overview Table 1-8 Time required for quick charge Item Charging time Power off . q Trickle Battery Charge The Main Battery Pack will trickle charge when the Universal AC Adapter is connected and the system is...
... time Item Charging Time Data preservation period (full charge) Time 48 hours About 1 month 1-16 Libretto 50CT/70CT Maintenance Manual 1.8 Batteries 1 Hardware Overview Table 1-8 Time required for quick charge Item Charging time Power off . q Trickle Battery Charge The Main Battery Pack will trickle charge when the Universal AC Adapter is connected and the system is...
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Figures 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 icon ...2-5 Table 2-2 DC IN icon...2-5 Table 2-3 Printer port LED boot mode status (1/2 2-13 Table 2-4 Printer port LED Hibernation mode error status 2-15 Table 2-5 FDD error codes and statuses 2-17 Table 2-6 Hard disk drive error codes and statuses 2-22 2-iv Libretto 50CT/70CT Maintenance Manual
Figures 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 icon ...2-5 Table 2-2 DC IN icon...2-5 Table 2-3 Printer port LED boot mode status (1/2 2-13 Table 2-4 Printer port LED Hibernation mode error status 2-15 Table 2-5 FDD error codes and statuses 2-17 Table 2-6 Hard disk drive error codes and statuses 2-22 2-iv Libretto 50CT/70CT Maintenance Manual
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...Procedure 1 Power Status Check The following icons indicate the power supply status: q Battery icon q DC IN icon The power supply controller displays the power supply status through the Battery and the DC IN icons as instructed. 2 Troubleshooting Procedures 2.3 Power Supply ...and components. Table 2-1 Battery icon Battery icon Power supply status Lights orange Quick charge *1 Lights green Battery has a full charge and the AC adapter is connected *1 One of two battery levels becomes low. *2 AutoResume Off will be executed soon. Libretto 50CT/70CT Maintenance Manual 2-5
...Procedure 1 Power Status Check The following icons indicate the power supply status: q Battery icon q DC IN icon The power supply controller displays the power supply status through the Battery and the DC IN icons as instructed. 2 Troubleshooting Procedures 2.3 Power Supply ...and components. Table 2-1 Battery icon Battery icon Power supply status Lights orange Quick charge *1 Lights green Battery has a full charge and the AC adapter is connected *1 One of two battery levels becomes low. *2 AutoResume Off will be executed soon. Libretto 50CT/70CT Maintenance Manual 2-5
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...DC IN icon does not light, go to Procedure 4. 2.3 Power Supply Troubleshooting 2 Troubleshooting Procedures To check the power supply status, install a battery pack and connect an AC adapter. If you use a different AC adapter, the computer's power supply may malfunction or a fuse on the ... On for one second "0" On for half second Interval between data bits Off for the Libretto 50CT/70CT. CAUTION: Use only an AC adapter that is over the limit (16.5 V) 2-6 Libretto 50CT/70CT Maintenance Manual q DC power supplied through AC adapter Error code Meaning 01h AC adapter voltage is...
...DC IN icon does not light, go to Procedure 4. 2.3 Power Supply Troubleshooting 2 Troubleshooting Procedures To check the power supply status, install a battery pack and connect an AC adapter. If you use a different AC adapter, the computer's power supply may malfunction or a fuse on the ... On for one second "0" On for half second Interval between data bits Off for the Libretto 50CT/70CT. CAUTION: Use only an AC adapter that is over the limit (16.5 V) 2-6 Libretto 50CT/70CT Maintenance Manual q DC power supplied through AC adapter Error code Meaning 01h AC adapter voltage is...
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2 Troubleshooting Procedures 2.3 Power Supply Troubleshooting q Battery pack Error code Meaning 10h Battery voltage is over the limit 11h Battery charge current is over the limit 12h Battery discharge current is over the maximum allowed limit when there is no load 13h Battery voltage is under the limit q B5V,VCC output Error code Meaning 20h VCC voltage... code Meaning 80h CPU temperature is outside the allowable range 88h CPU overheat (The CPU heat sensor has detected overheating and has automatically shut down) Libretto 50CT/70CT Maintenance Manual 2-7
2 Troubleshooting Procedures 2.3 Power Supply Troubleshooting q Battery pack Error code Meaning 10h Battery voltage is over the limit 11h Battery charge current is over the limit 12h Battery discharge current is over the maximum allowed limit when there is no load 13h Battery voltage is under the limit q B5V,VCC output Error code Meaning 20h VCC voltage... code Meaning 80h CPU temperature is outside the allowable range 88h CPU overheat (The CPU heat sensor has detected overheating and has automatically shut down) Libretto 50CT/70CT Maintenance Manual 2-7
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... computer DC IN socket and to Procedure 3. If it indicates that is about room temperature until the CPU's internal temperature is , go to Procedure 4. 2-8 Libretto 50CT/70CT Maintenance Manual If the error still exists, go to the following step: q Replace the AC adapter with a new one . Check 4 When 88h displays, ...q Leave the computer in an area that the CPU temperature is correctly installed in the computer. Check 3 If error code 10h displays: q Make sure the battery pack is outside the allowable operating range. If these cables are connected correctly, go to Procedure 4.
... computer DC IN socket and to Procedure 3. If it indicates that is about room temperature until the CPU's internal temperature is , go to Procedure 4. 2-8 Libretto 50CT/70CT Maintenance Manual If the error still exists, go to the following step: q Replace the AC adapter with a new one . Check 4 When 88h displays, ...q Leave the computer in an area that the CPU temperature is correctly installed in the computer. Check 3 If error code 10h displays: q Make sure the battery pack is outside the allowable operating range. If these cables are connected correctly, go to Procedure 4.
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... (e) *** Bad time function *** Check system. Then press [F1] key ...... 2-10 Libretto 50CT/70CT Maintenance Manual 2.4 System Board Troubleshooting 2 Troubleshooting Procedures 2.4 System Board Troubleshooting This section describes how...Press the F1 key as instructed. Then press [F1] key ...... (b) *** Bad RTC battery *** Check system. These errors occur when the system configuration preserved in Hibernation Mode Procedure ... no error message, go to set the system configuration. q If Toshiba MS-DOS or Toshiba Windows 95 is properly loaded, go to Procedure 2. Then press [...
... (e) *** Bad time function *** Check system. Then press [F1] key ...... 2-10 Libretto 50CT/70CT Maintenance Manual 2.4 System Board Troubleshooting 2 Troubleshooting Procedures 2.4 System Board Troubleshooting This section describes how...Press the F1 key as instructed. Then press [F1] key ...... (b) *** Bad RTC battery *** Check system. These errors occur when the system configuration preserved in Hibernation Mode Procedure ... no error message, go to set the system configuration. q If Toshiba MS-DOS or Toshiba Windows 95 is properly loaded, go to Procedure 2. Then press [...
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...Message - - VRAM ERROR SYSTEM MEMORY ERROR SYSTEM MEMORY PARITY ERROR EXTENDED MEMORY ERROR EXTENDED MEMORY PARITY ERROR DMA PAGE REGISTER ERROR DMAC #X ERROR Libretto 50CT/70CT Maintenance Manual 2-13 PIT ERROR - 2 Troubleshooting Procedures 2.4 System Board Troubleshooting NOTE: If an error condition is detected by the IRT test, ...FIRST 64KB MEMORY ERROR FIRST 64KB MEMORY PARITY ERROR - - - - MEMORY REFRESH ERROR TIMER CH.2 OUT ERROR CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR - - - - - - In this instance, the IRT indicates an error has been detected during the system memory test.
...Message - - VRAM ERROR SYSTEM MEMORY ERROR SYSTEM MEMORY PARITY ERROR EXTENDED MEMORY ERROR EXTENDED MEMORY PARITY ERROR DMA PAGE REGISTER ERROR DMAC #X ERROR Libretto 50CT/70CT Maintenance Manual 2-13 PIT ERROR - 2 Troubleshooting Procedures 2.4 System Board Troubleshooting NOTE: If an error condition is detected by the IRT test, ...FIRST 64KB MEMORY ERROR FIRST 64KB MEMORY PARITY ERROR - - - - MEMORY REFRESH ERROR TIMER CH.2 OUT ERROR CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR - - - - - - In this instance, the IRT indicates an error has been detected during the system memory test.
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... time without saving changes. NOTES: 1. To show the factory preset configuration, press Home. 2. To accept the default settings, press End and then press Y. 3-52 Libretto 50CT/70CT Maintenance Manual Repeat the steps above. 3. NOTE: You can go to a specific group by pressing the first letter (highlighted) of the group's name. Press either..., press the PgUp (page up) or PgDn (page down) key. 3.24.4 Accepting Changes and Exiting the SETUP Window 1. For example, B, to go directly to the Battery group. 2.
... time without saving changes. NOTES: 1. To show the factory preset configuration, press Home. 2. To accept the default settings, press End and then press Y. 3-52 Libretto 50CT/70CT Maintenance Manual Repeat the steps above. 3. NOTE: You can go to a specific group by pressing the first letter (highlighted) of the group's name. Press either..., press the PgUp (page up) or PgDn (page down) key. 3.24.4 Accepting Changes and Exiting the SETUP Window 1. For example, B, to go directly to the Battery group. 2.
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... volume to high. (Default) When Alarm Volume is selected, the subwindow below displays to low. Low Battery Alarm Panel Close Alarm = Enabled = Enabled Enabled Disabled Enables the feature. (Default) Disables the feature. 3-60 Libretto 50CT/70CT Maintenance Manual In Boot mode, it is not used for alarms. This option can be set by...
... volume to high. (Default) When Alarm Volume is selected, the subwindow below displays to low. Low Battery Alarm Panel Close Alarm = Enabled = Enabled Enabled Disabled Enables the feature. (Default) Disables the feature. 3-60 Libretto 50CT/70CT Maintenance Manual In Boot mode, it is not used for alarms. This option can be set by...
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... to Disabled, the computer will be lost. This option does not appear when the computer is enabled. NOTE: Do not remove the AC adapter and battery pack at the same time every day. Seconds cannot be powered on and lets you set to the left when you set in boot mode... Date Option is set a time and date for automatic power on at the same time when you to enable or disable the system beep. Libretto 50CT/70CT Maintenance Manual 3-61 Enabled Enables the feature. If this feature is enabled when the computer is in the sequence of month and day. If Alarm...
... to Disabled, the computer will be lost. This option does not appear when the computer is enabled. NOTE: Do not remove the AC adapter and battery pack at the same time every day. Seconds cannot be powered on and lets you set to the left when you set in boot mode... Date Option is set a time and date for automatic power on at the same time when you to enable or disable the system beep. Libretto 50CT/70CT Maintenance Manual 3-61 Enabled Enables the feature. If this feature is enabled when the computer is in the sequence of month and day. If Alarm...
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... F10 key down while the computer is not displayed; 3.24 SETUP 3 Tests and Diagnostics NOTES: 1. Do not remove the AC adapter and battery pack at the same time when you use the computer. (h) Pointing Devices This option enables or disables the AccuPoint. The Password = message is...for bootable files first on the HDD and next on , the computer will be lost. This procedure alternates the setup setting. 3-62 Libretto 50CT/70CT Maintenance Manual If you have set a password and the computer boots by AutoResume will start with the instant security function enabled. Otherwise, ...
... F10 key down while the computer is not displayed; 3.24 SETUP 3 Tests and Diagnostics NOTES: 1. Do not remove the AC adapter and battery pack at the same time when you use the computer. (h) Pointing Devices This option enables or disables the AccuPoint. The Password = message is...for bootable files first on the HDD and next on , the computer will be lost. This procedure alternates the setup setting. 3-62 Libretto 50CT/70CT Maintenance Manual If you have set a password and the computer boots by AutoResume will start with the instant security function enabled. Otherwise, ...