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Toshiba Libretto 50CT/70CT Maintenance Manual Third edition February 1998 Disclaimer The information contained in this manual is subject to the use of this manual cannot be reproduced in connection with respect to change without the prior written permission of Toshiba. MS-DOS and Windows are trademarks of Microsoft Corporation. Sound Blaster and Pro are...
Toshiba Libretto 50CT/70CT Maintenance Manual Third edition February 1998 Disclaimer The information contained in this manual is subject to the use of this manual cannot be reproduced in connection with respect to change without the prior written permission of Toshiba. MS-DOS and Windows are trademarks of Microsoft Corporation. Sound Blaster and Pro are...
User Guide
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... messages will be sure to ensure that could cause overheating, smoke, or fire. Information on the Libretto 70CT has been incorporated into this manual are strictly adhered to perform hardware service maintenance for the Toshiba Personal Computer Libretto 50CT/70CT. Preface This maintenance manual describes how to . Each of a hazard that the following safety precautions...
... messages will be sure to ensure that could cause overheating, smoke, or fire. Information on the Libretto 70CT has been incorporated into this manual are strictly adhered to perform hardware service maintenance for the Toshiba Personal Computer Libretto 50CT/70CT. Preface This maintenance manual describes how to . Each of a hazard that the following safety precautions...
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... the FRUs. The manual is divided into the following : u Handling the LCD module u Board layout u Pin assignments u Key layout u Wiring diagrams u BIOS Rewrite Procedures u Reliability Libretto 50CT/70CT Maintenance Manual iii
... the FRUs. The manual is divided into the following : u Handling the LCD module u Board layout u Pin assignments u Key layout u Wiring diagrams u BIOS Rewrite Procedures u Reliability Libretto 50CT/70CT Maintenance Manual iii
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... Text generated by a plus (+) sign. We identify such operations by the keytop symbols separated by the Libretto 50CT, that you to type in is shown in the boldface type below : Format complete System transferred iv Libretto 50CT/70CT Maintenance Manual For example, Ctrl + Pause (Break) means you must hold down Ctrl and at...
... Text generated by a plus (+) sign. We identify such operations by the keytop symbols separated by the Libretto 50CT, that you to type in is shown in the boldface type below : Format complete System transferred iv Libretto 50CT/70CT Maintenance Manual For example, Ctrl + Pause (Break) means you must hold down Ctrl and at...
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... Test 3-1 3.2 Executing the Diagnostic Test 3-3 3.3 Subtest Names ...3-7 3.4 System Test ...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
... Test 3-1 3.2 Executing the Diagnostic Test 3-3 3.3 Subtest Names ...3-7 3.4 System Test ...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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... ...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
... ...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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4.16 I/O Adapter Board 4-33 Appendices Appendix A Handling the LCD Module A-1 Appendix B Board Layout B-1 Appendix C Pin Assignments C-1 Appendix D Key Layouts D-1 Appendix E Wiring Diagrams E-1 Appendix F BIOS Rewrite Procedures F-1 Appendix G Reliability...G-1 Libretto 50CT/70CT Maintenance Manual vii
4.16 I/O Adapter Board 4-33 Appendices Appendix A Handling the LCD Module A-1 Appendix B Board Layout B-1 Appendix C Pin Assignments C-1 Appendix D Key Layouts D-1 Appendix E Wiring Diagrams E-1 Appendix F BIOS Rewrite Procedures F-1 Appendix G Reliability...G-1 Libretto 50CT/70CT Maintenance Manual vii
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... 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 Manual 1-iii
... 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 Manual 1-iii
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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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q Memory Standard 16MB of up the Real Time Clock and CMOS memory. 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...special functions in the memory slot. q Keyboard An easy-to provide compact size, minimum weight, low power usage, and high reliability. Libretto 50CT/70CT Maintenance Manual 1-1 or 102-key enhanced keyboard. A video controller and 1MB of VRAM enable an external monitor to 16M colors at ...
q Memory Standard 16MB of up the Real Time Clock and CMOS memory. 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...special functions in the memory slot. q Keyboard An easy-to provide compact size, minimum weight, low power usage, and high reliability. Libretto 50CT/70CT Maintenance Manual 1-1 or 102-key enhanced keyboard. A video controller and 1MB of VRAM enable an external monitor to 16M colors at ...
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.... A Universal Asynchronous Receiver/Transmitter (UART) is equipped with a built-in addition to the PC card slot and accommodates both 2HD (1.44MB) and 2DD (720KB) disks. 1-2 Libretto 50CT/70CT Maintenance Manual 1.1 Features 1 Hardware Overview q Parallel port A Centronics compatible parallel port on the I /O adapter enables connection of such serial devices as a serial printer, mouse...
.... A Universal Asynchronous Receiver/Transmitter (UART) is equipped with a built-in addition to the PC card slot and accommodates both 2HD (1.44MB) and 2DD (720KB) disks. 1-2 Libretto 50CT/70CT Maintenance Manual 1.1 Features 1 Hardware Overview q Parallel port A Centronics compatible parallel port on the I /O adapter enables connection of such serial devices as a serial printer, mouse...
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Figure 1-2 System unit configuration Libretto 50CT/70CT Maintenance Manual 1-3 1 Hardware Overview The front of the computer is shown in Figure 1-1. 1.1 Features Figure 1-1 Front of the computer The system unit configuration is shown in Figure 1-2.
Figure 1-2 System unit configuration Libretto 50CT/70CT Maintenance Manual 1-3 1 Hardware Overview The front of the computer is shown in Figure 1-1. 1.1 Features Figure 1-1 Front of the computer The system unit configuration is shown in Figure 1-2.
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1.2 System Unit Block Diagram 1.2 System Unit Block Diagram Figure 1-3 is a block diagram of the system unit. 1 Hardware Overview Figure 1-3 System unit block diagram 1-4 Libretto 50CT/70CT Maintenance Manual
1.2 System Unit Block Diagram 1.2 System Unit Block Diagram Figure 1-3 is a block diagram of the system unit. 1 Hardware Overview Figure 1-3 System unit block diagram 1-4 Libretto 50CT/70CT Maintenance Manual
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...: Intel 75 MHz Pentium processor operates at 2.9/3.3 volts and incorporates the math co-processor and 16 KB cache memory. ∗Libretto 70CT: Intel 120 MHz Pentium processor with MMX technology operates at 2.9/3.3 volts and incorporates the math co-processor and 16 KB cache memory. q Video RAM • 1 ...MB, two 256K x 16-bit DRAM chips • 3.3 volt operation • Access time 50 ns Libretto 50CT/70CT Maintenance Manual 1-5 The video controller integrates an LCD/CRT graphics controller, RAMDAC, and clock synthesizers.
...: Intel 75 MHz Pentium processor operates at 2.9/3.3 volts and incorporates the math co-processor and 16 KB cache memory. ∗Libretto 70CT: Intel 120 MHz Pentium processor with MMX technology operates at 2.9/3.3 volts and incorporates the math co-processor and 16 KB cache memory. q Video RAM • 1 ...MB, two 256K x 16-bit DRAM chips • 3.3 volt operation • Access time 50 ns Libretto 50CT/70CT Maintenance Manual 1-5 The video controller integrates an LCD/CRT graphics controller, RAMDAC, and clock synthesizers.
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and controls: the internal keyboard, external keyboard, IPS and PS/2 mouse. 1-6 Libretto 50CT/70CT Maintenance Manual 1.2 System Unit Block Diagram 1 Hardware Overview q System Controller Gate Array This gate array has the following functions: • Two PICs: 82C59 equivalent • ...
and controls: the internal keyboard, external keyboard, IPS and PS/2 mouse. 1-6 Libretto 50CT/70CT Maintenance Manual 1.2 System Unit Block Diagram 1 Hardware Overview q System Controller Gate Array This gate array has the following functions: • Two PICs: 82C59 equivalent • ...
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q Sound Controller The Libretto 50CT uses one OPL3-SA2 that incorporates: OPL3 FM synthesizer, Digital Analog Converter (DAC), and MPU401 MIDI interface. ∗The Libretto 70CT uses one OPL3-SA3 that incorporates: OPL3 FM synthesizer, Digital Analog Converter (DAC), and MPU401 MIDI interface. Libretto 50CT/70CT Maintenance Manual 1-7 1 Hardware Overview 1.2 System Unit Block Diagram q Internal Pointing Stick Controller (IPSC) Provides simultaneous control of both an AccuPoint and a PS/2 mouse.
q Sound Controller The Libretto 50CT uses one OPL3-SA2 that incorporates: OPL3 FM synthesizer, Digital Analog Converter (DAC), and MPU401 MIDI interface. ∗The Libretto 70CT uses one OPL3-SA3 that incorporates: OPL3 FM synthesizer, Digital Analog Converter (DAC), and MPU401 MIDI interface. Libretto 50CT/70CT Maintenance Manual 1-7 1 Hardware Overview 1.2 System Unit Block Diagram q Internal Pointing Stick Controller (IPSC) Provides simultaneous control of both an AccuPoint and a PS/2 mouse.
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... method 2MB mode 1MB mode 2,000 1,440 2 80 1,000 720 2 80 3 3 181 181 15 15 135 135 500 250 300 300 Modified Frequency Modulation (MFM) 1-8 Libretto 50CT/70CT Maintenance Manual
... method 2MB mode 1MB mode 2,000 1,440 2 80 1,000 720 2 80 3 3 181 181 15 15 135 135 500 250 300 300 Modified Frequency Modulation (MFM) 1-8 Libretto 50CT/70CT Maintenance Manual
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It has a non-removable 2.5-inch magnetic disk and mini-winchester type magnetic heads. The HDD is a random access non-volatile storage device. 1 Hardware Overview 1.4 2.5-inch HDD 1.4 2.5-inch HDD The removable HDD is shown in Figure 1-5. The Libretto 50CT computer supports a 815MB HDD. ∗The Libretto 70CT computer supports a 1.58GB HDD. Figure 1-5 2.5-inch HDD Libretto 50CT/70CT Maintenance Manual 1-9
It has a non-removable 2.5-inch magnetic disk and mini-winchester type magnetic heads. The HDD is a random access non-volatile storage device. 1 Hardware Overview 1.4 2.5-inch HDD 1.4 2.5-inch HDD The removable HDD is shown in Figure 1-5. The Libretto 50CT computer supports a 815MB HDD. ∗The Libretto 70CT computer supports a 1.58GB HDD. Figure 1-5 2.5-inch HDD Libretto 50CT/70CT Maintenance Manual 1-9
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Table 1-2 HDD specifications Libretto 50CT: 815MB HDD Item Specifications Formatted capacity (MB) 815 Number of disks 1 Logical heads 2 Bytes per sector 512 Rotation speed (rpm) 4,000 Recording method 8-9 RLL *Libretto 70CT: 815MB HDD Item Formatted capacity (GB) Number of disks Logical heads Bytes per sector Rotation speed (rpm) Recording method Specifications 1.58 1 2 512 4,000 8-9 RLL 1-10 Libretto 50CT/70CT Maintenance Manual 1.4 2.5-inch HDD 1 Hardware Overview The specifications for the HDDs are listed in Table 1-2.
Table 1-2 HDD specifications Libretto 50CT: 815MB HDD Item Specifications Formatted capacity (MB) 815 Number of disks 1 Logical heads 2 Bytes per sector 512 Rotation speed (rpm) 4,000 Recording method 8-9 RLL *Libretto 70CT: 815MB HDD Item Formatted capacity (GB) Number of disks Logical heads Bytes per sector Rotation speed (rpm) Recording method Specifications 1.58 1 2 512 4,000 8-9 RLL 1-10 Libretto 50CT/70CT Maintenance Manual 1.4 2.5-inch HDD 1 Hardware Overview The specifications for the HDDs are listed in Table 1-2.
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... the system board through one 20-pin flat cable. Table 1-3 Keyboard specifications Item Input method Pitch Thickness Specifications Pantograph (Function keys use cylinders) 15mm 6mm Libretto 50CT/70CT Maintenance Manual 1-11 1 Hardware Overview 1.5 Keyboard 1.5 Keyboard The 80- (USA) or 82- key (European) keyboard is shown in Table 1-3. The AccuPoint, located on the...
... the system board through one 20-pin flat cable. Table 1-3 Keyboard specifications Item Input method Pitch Thickness Specifications Pantograph (Function keys use cylinders) 15mm 6mm Libretto 50CT/70CT Maintenance Manual 1-11 1 Hardware Overview 1.5 Keyboard 1.5 Keyboard The 80- (USA) or 82- key (European) keyboard is shown in Table 1-3. The AccuPoint, located on the...
