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...hazard that the following safety precautions are used in property damage if the safety instruction is noted by Toshiba. ii Libretto 50CT/70CT Maintenance Manual Information added that could result in this manual since its original release. Each of a hazard ...the wrong battery can cause the battery to your attention. q If you replace the battery pack, RTC battery, or backup battery, be italicized and identified as shown below. Installation of messages are strictly adhered to perform hardware service maintenance for the Toshiba Personal Computer Libretto 50CT/70CT. ...
...hazard that the following safety precautions are used in property damage if the safety instruction is noted by Toshiba. ii Libretto 50CT/70CT Maintenance Manual Information added that could result in this manual since its original release. Each of a hazard ...the wrong battery can cause the battery to your attention. q If you replace the battery pack, RTC battery, or backup battery, be italicized and identified as shown below. Installation of messages are strictly adhered to perform hardware service maintenance for the Toshiba Personal Computer Libretto 50CT/70CT. ...
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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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...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 Board 4-27 4.14 AccuPoint Board 4-29 4.15 LCD Flexible Cable 4-31 vi Libretto 50CT/70CT Maintenance Manual
...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 Board 4-27 4.14 AccuPoint Board 4-29 4.15 LCD Flexible Cable 4-31 vi Libretto 50CT/70CT Maintenance Manual
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... Battery Pack 1-13 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...
... Battery Pack 1-13 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...
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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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... size, minimum weight, low power usage, and high reliability. 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-... are incorporated: u Microprocessor The Libretto 50CT has a 64-bit microprocessor, Intel Pentium processor running at a resolution of 640 x 480 pixels. q Batteries Two batteries: a Lithium-Ion main battery pack and RTC battery that enables a display of 120MHz. Libretto 50CT/70CT Maintenance Manual 1-1
... size, minimum weight, low power usage, and high reliability. 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-... are incorporated: u Microprocessor The Libretto 50CT has a 64-bit microprocessor, Intel Pentium processor running at a resolution of 640 x 480 pixels. q Batteries Two batteries: a Lithium-Ion main battery pack and RTC battery that enables a display of 120MHz. Libretto 50CT/70CT Maintenance Manual 1-1
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... BIOS ROM, KBC, PC card Name B3V VCC DC voltage (V) +3.3 +12.0 Regulation tolerance (%) ±5 ±5 1-14 Libretto 50CT/70CT Maintenance Manual Detects a fully charged Main Battery Pack. 5. The power supply output rating is connected to the system board, has one microprocessor operating at 2 MHz, and performs ... following functions: 1. 1.7 Power Supply 1 Hardware Overview 1.7 Power Supply The power supply provides two kinds of a low Main Battery Pack. 7. Determines if the Universal AC Adapter or Main Battery Pack is specified in Table 1-6. Calculates the remaining Main...
... BIOS ROM, KBC, PC card Name B3V VCC DC voltage (V) +3.3 +12.0 Regulation tolerance (%) ±5 ±5 1-14 Libretto 50CT/70CT Maintenance Manual Detects a fully charged Main Battery Pack. 5. The power supply output rating is connected to the system board, has one microprocessor operating at 2 MHz, and performs ... following functions: 1. 1.7 Power Supply 1 Hardware Overview 1.7 Power Supply The power supply provides two kinds of a low Main Battery Pack. 7. Determines if the Universal AC Adapter or Main Battery Pack is specified in Table 1-6. Calculates the remaining Main...
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... indicates: Orange Green Blinking orange No light The battery is being charged. (Universal AC Adapter connected) The battery is full charged. (Universal AC Adapter connected) The battery is low when the power is on . 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...
... indicates: Orange Green Blinking orange No light The battery is being charged. (Universal AC Adapter connected) The battery is full charged. (Universal AC Adapter connected) The battery is low when the power is on . 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...
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...time and data preservation period of the following occurs, the Main Battery Pack quick charge process stops. 1. The microprocessor automatically changes quick charge to trickle charge. 1.8.4 RTC battery The RTC battery provides power to keep the current date, time, and other ...Battery Pack becomes fully charged. 2. The Universal AC Adapter or Main Battery Pack is turned off or standby About 4.5 hours If one of the RTC battery. Table 1-9 RTC battery charging/data preservation time Item Charging Time Data preservation period (full charge) Time 48 hours About 1 month 1-16 Libretto 50CT...
...time and data preservation period of the following occurs, the Main Battery Pack quick charge process stops. 1. The microprocessor automatically changes quick charge to trickle charge. 1.8.4 RTC battery The RTC battery provides power to keep the current date, time, and other ...Battery Pack becomes fully charged. 2. The Universal AC Adapter or Main Battery Pack is turned off or standby About 4.5 hours If one of the RTC battery. Table 1-9 RTC battery charging/data preservation time Item Charging Time Data preservation period (full charge) Time 48 hours About 1 month 1-16 Libretto 50CT...
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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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..., the DC IN icon blinks and an error code is connected *1 One of two battery levels becomes low. *2 AutoResume Off will go out even if the AC adapter is displayed. Libretto 50CT/70CT Maintenance Manual 2-5 The procedures described in the tables below. To determine if the ...power supply is connected Blinks orange (even intervals) The battery level becomes low while operating the computer on battery power*2 Doesn't light Any condition other...
..., the DC IN icon blinks and an error code is connected *1 One of two battery levels becomes low. *2 AutoResume Off will go out even if the AC adapter is displayed. Libretto 50CT/70CT Maintenance Manual 2-5 The procedures described in the tables below. To determine if the ...power supply is connected Blinks orange (even intervals) The battery level becomes low while operating the computer on battery power*2 Doesn't light Any condition other...
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Check 3 If the Battery icon does not light orange or green, go to Procedure 4. Check 2 If the DC IN icon does not light, go to Procedure 3. CAUTION: Use only an AC adapter that is over the limit (16.5 V) 2-6 Libretto 50CT/70CT Maintenance Manual The blink pattern..."1" On for one second "0" On for half second Interval between data bits Off for the Libretto 50CT/70CT. 2.3 Power Supply Troubleshooting 2 Troubleshooting Procedures To check the power supply status, install a battery pack and connect an AC adapter. q DC power supplied through AC adapter Error code Meaning...
Check 3 If the Battery icon does not light orange or green, go to Procedure 4. Check 2 If the DC IN icon does not light, go to Procedure 3. CAUTION: Use only an AC adapter that is over the limit (16.5 V) 2-6 Libretto 50CT/70CT Maintenance Manual The blink pattern..."1" On for one second "0" On for half second Interval between data bits Off for the Libretto 50CT/70CT. 2.3 Power Supply Troubleshooting 2 Troubleshooting Procedures To check the power supply status, install a battery pack and connect an AC adapter. q DC power supplied through AC adapter Error code Meaning...
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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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...the power source. If these cables are connected correctly, go to the following step: q Replace the battery pack with a new one . Check 3 If error code 10h displays: q Make sure the battery pack is correctly installed in an area that the CPU temperature is outside the allowable operating range. If ...error still exists, go to Procedure 4. If the error still exists, go to Procedure 4. Check 6 For any other error, go to Procedure 4. 2-8 Libretto 50CT/70CT Maintenance Manual If the error still exists, go to Procedure 4. Do the following: q Leave the computer in the computer.
...the power source. If these cables are connected correctly, go to the following step: q Replace the battery pack with a new one . Check 3 If error code 10h displays: q Make sure the battery pack is correctly installed in an area that the CPU temperature is outside the allowable operating range. If ...error still exists, go to Procedure 4. If the error still exists, go to Procedure 4. Check 6 For any other error, go to Procedure 4. 2-8 Libretto 50CT/70CT Maintenance Manual If the error still exists, go to Procedure 4. Do the following: q Leave the computer in the computer.
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... the Initial Reliability Test (IRT) installed in the RTC memory (CMOS type memory) is shown on , replace the RTC battery. q If Toshiba MS-DOS or Toshiba Windows 95 is on the display, perform Check 1. If error message (b) displays often when the power is properly loaded, go...the BIOS ROM. Then press [F1] key ...... (f) *** Bad check sum (CMOS) *** Check system. Then press [F1] key ...... 2-10 Libretto 50CT/70CT Maintenance Manual If any other procedures as the actual configuration or when the data is defective or not functioning properly. 2.4 System Board Troubleshooting 2 ...
... the Initial Reliability Test (IRT) installed in the RTC memory (CMOS type memory) is shown on , replace the RTC battery. q If Toshiba MS-DOS or Toshiba Windows 95 is on the display, perform Check 1. If error message (b) displays often when the power is properly loaded, go...the BIOS ROM. Then press [F1] key ...... (f) *** Bad check sum (CMOS) *** Check system. Then press [F1] key ...... 2-10 Libretto 50CT/70CT Maintenance Manual If any other procedures as the actual configuration or when the data is defective or not functioning properly. 2.4 System Board Troubleshooting 2 ...
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..., the IRT indicates an error has been detected during the system memory test. MEMORY REFRESH ERROR TIMER CH.2 OUT ERROR CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR - - - - - - For example, when the printer port LED displays 1F and halts, the IRT test has already completed the Display initialization. FIRST 64KB MEMORY ERROR... IRT test ends. 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
..., the IRT indicates an error has been detected during the system memory test. MEMORY REFRESH ERROR TIMER CH.2 OUT ERROR CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR - - - - - - For example, when the printer port LED displays 1F and halts, the IRT test has already completed the Display initialization. FIRST 64KB MEMORY ERROR... IRT test ends. 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
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...: You can go to move between items in a column. 2. To accept the default settings, press End and then press Y. 3-52 Libretto 50CT/70CT Maintenance Manual Press ↑ and ↓ to the Battery group. 2. For example, B, to go directly to quit at any time without saving changes. To accept the changes, press Y. Press either...
...: You can go to move between items in a column. 2. To accept the default settings, press End and then press Y. 3-52 Libretto 50CT/70CT Maintenance Manual Press ↑ and ↓ to the Battery group. 2. For example, B, to go directly to quit at any time without saving changes. To accept the changes, press Y. Press either...
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... one below displays to let you enable or disable certain functions. Setting this setting are working in main memory. xx Min Automatically turns off . Low Battery Alarm Panel Close Alarm = Enabled = Enabled Enabled Disabled Enables the feature. (Default) Disables the feature. 3-60 Libretto 50CT/70CT Maintenance Manual
... one below displays to let you enable or disable certain functions. Setting this setting are working in main memory. xx Min Automatically turns off . Low Battery Alarm Panel Close Alarm = Enabled = Enabled Enabled Disabled Enables the feature. (Default) Disables the feature. 3-60 Libretto 50CT/70CT Maintenance Manual
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... the system is automatically powered off by AutoResume will be powered on at the same time when you enable or disable the ring indicator feature. Libretto 50CT/70CT Maintenance Manual 3-61 If this feature is enabled when the computer is opened. This option does not appear when the computer is in Resume... mode and Alarm Date Option is displayed when Alarm Time is in boot mode. NOTE: Do not remove the AC adapter and battery pack at the same time every day. Ring Indicator is displayed only when the computer is enabled. You must also reset this option. (g) Alarm...
... the system is automatically powered off by AutoResume will be powered on at the same time when you enable or disable the ring indicator feature. Libretto 50CT/70CT Maintenance Manual 3-61 If this feature is enabled when the computer is opened. This option does not appear when the computer is in Resume... mode and Alarm Date Option is displayed when Alarm Time is in boot mode. NOTE: Do not remove the AC adapter and battery pack at the same time every day. Ring Indicator is displayed only when the computer is enabled. You must also reset this option. (g) Alarm...
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... the Auto Power On function and Resume is on the FDD. Otherwise, the AccuPoint is booting. This procedure alternates the setup setting. 3-62 Libretto 50CT/70CT Maintenance Manual Auto selected If the PS/2 mouse is connected to the computer when you do so, data saved by holding the F10 key... disk drive priority for bootable files first on the HDD and next on , the computer will be lost. Do not remove the AC adapter and battery pack at the same time when you must also reset this feature. 3.24 SETUP 3 Tests and Diagnostics NOTES: 1. however, you use the computer. ...
... the Auto Power On function and Resume is on the FDD. Otherwise, the AccuPoint is booting. This procedure alternates the setup setting. 3-62 Libretto 50CT/70CT Maintenance Manual Auto selected If the PS/2 mouse is connected to the computer when you do so, data saved by holding the F10 key... disk drive priority for bootable files first on the HDD and next on , the computer will be lost. Do not remove the AC adapter and battery pack at the same time when you must also reset this feature. 3.24 SETUP 3 Tests and Diagnostics NOTES: 1. however, you use the computer. ...