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...or more keys. For example: Read Only Memory (ROM) Keys Keys are instructed to describe many operations. The keytop symbol as it appears on the screen, is shown in the boldface type below : Format complete System transferred iv Libretto 50CT/70CT Maintenance Manual For example, Ctrl + Pause... (Break) means you are used , hold down the first two and at the same time press Pause (Break). We identify such operations by the keytop symbols separated by the Libretto 50CT, that you must hold...
...or more keys. For example: Read Only Memory (ROM) Keys Keys are instructed to describe many operations. The keytop symbol as it appears on the screen, is shown in the boldface type below : Format complete System transferred iv Libretto 50CT/70CT Maintenance Manual For example, Ctrl + Pause... (Break) means you are used , hold down the first two and at the same time press Pause (Break). We identify such operations by the keytop symbols separated by the Libretto 50CT, that you must hold...
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... 2.7 Keyboard Troubleshooting 2-23 2.8 Pointing Device Troubleshooting 2-24 2.9 Display Troubleshooting 2-25 Chapter 3 Tests and Diagnostics 3.1 The Diagnostic 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
... 2.7 Keyboard Troubleshooting 2-23 2.8 Pointing Device Troubleshooting 2-24 2.9 Display Troubleshooting 2-25 Chapter 3 Tests and Diagnostics 3.1 The Diagnostic 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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... 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...
... 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...
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... (LCD), that supports a 101- and software that enables a display of up the Real Time Clock and CMOS memory. Libretto 50CT/70CT Maintenance Manual 1-1 A video controller and 1MB of VRAM enable an external monitor to 16M colors at a clock speed of 75MHz. ∗...that backs up to display 16M colors at a clock speed of 640 x 480 pixels. 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 provides: a numeric...
... (LCD), that supports a 101- and software that enables a display of up the Real Time Clock and CMOS memory. Libretto 50CT/70CT Maintenance Manual 1-1 A video controller and 1MB of VRAM enable an external monitor to 16M colors at a clock speed of 75MHz. ∗...that backs up to display 16M colors at a clock speed of 640 x 480 pixels. 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 provides: a numeric...
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...& Technologies F65550 is composed of the following major components: q Microprocessor Libretto 50CT: 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 1 Hardware Overview 1.2 System Unit Block Diagram ...
...& Technologies F65550 is composed of the following major components: q Microprocessor Libretto 50CT: 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 1 Hardware Overview 1.2 System Unit Block Diagram ...
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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...• Address latch control − Address conversion − Address latch • Hibernation control • Ring wake up control • PC card control − Memory card control − I/O card control • BIOS-ROM interface • Infrared port control • Sound control q Keyboard Controller (KBC) This KBC includes: ...
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...• Address latch control − Address conversion − Address latch • Hibernation control • Ring wake up control • PC card control − Memory card control − I/O card control • BIOS-ROM interface • Infrared port control • Sound control q Keyboard Controller (KBC) This KBC includes: ...
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...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/70CT Maintenance Manual 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 setup information in memory while the computer is abnormal. Table 1-9 shows the charging time and data preservation period of the following occurs, the Main 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/70CT Maintenance Manual 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 setup information in memory while the computer is abnormal. Table 1-9 shows the charging time and data preservation period of the following occurs, the Main Battery...
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If an error is detected on the system test, memory test, display test, ASYNC test, printer test, expansion test, sound test, or real timer test do the Display troubleshooting procedures in Section 2.9. 2-4 Libretto 50CT/70CT Maintenance Manual If an error is detected on the display test, do the System Board troubleshooting procedures in Section...
If an error is detected on the system test, memory test, display test, ASYNC test, printer test, expansion test, sound test, or real timer test do the Display troubleshooting procedures in Section 2.9. 2-4 Libretto 50CT/70CT Maintenance Manual If an error is detected on the display test, do the System Board troubleshooting procedures in Section...
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...-DOS or Toshiba Windows 95 is defective or not functioning properly. Then press [F1] key ...... (e) *** Bad time function *** Check system. Then press [F1] key ...... (d) *** Bad memory size *** Check system. q If an error message is turned on, the system performs the ... Check 1. Then press [F1] key ...... (b) *** Bad RTC battery *** Check system. Then press [F1] key ...... 2-10 Libretto 50CT/70CT Maintenance Manual These errors occur when the system configuration preserved in Hibernation Mode Procedure 4: Diagnostic Test Program Execution and Replacement Checks Procedure ...
...-DOS or Toshiba Windows 95 is defective or not functioning properly. Then press [F1] key ...... (e) *** Bad time function *** Check system. Then press [F1] key ...... (d) *** Bad memory size *** Check system. q If an error message is turned on, the system performs the ... Check 1. Then press [F1] key ...... (b) *** Bad RTC battery *** Check system. Then press [F1] key ...... 2-10 Libretto 50CT/70CT Maintenance Manual These errors occur when the system configuration preserved in Hibernation Mode Procedure 4: Diagnostic Test Program Execution and Replacement Checks Procedure ...
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... ERROR (2) TIMER CH.2 OUT ERROR (3) MEMORY REFRESH ERROR (4) FIRST 64KB MEMORY ERROR (5) CRT ERROR (6) CRTC ERROR (7) KBC ERROR (8) VRAM ERROR (9) SYSTEM MEMORY ERROR (10) SYSTEM MEMORY PARITY ERROR (11) EXTENDED MEMORY ERROR (12) EXTENDED MEMORY PARITY ERROR (13) DMA PAGE REGISTER ERROR (14) DMAC #1 ERROR (15) DMAC #2 ERROR (16) PIC #1 ERROR Libretto 50CT/70CT Maintenance Manual 2-11 2 Troubleshooting...
... ERROR (2) TIMER CH.2 OUT ERROR (3) MEMORY REFRESH ERROR (4) FIRST 64KB MEMORY ERROR (5) CRT ERROR (6) CRTC ERROR (7) KBC ERROR (8) VRAM ERROR (9) SYSTEM MEMORY ERROR (10) SYSTEM MEMORY PARITY ERROR (11) EXTENDED MEMORY ERROR (12) EXTENDED MEMORY PARITY ERROR (13) DMA PAGE REGISTER ERROR (14) DMAC #1 ERROR (15) DMAC #2 ERROR (16) PIC #1 ERROR Libretto 50CT/70CT Maintenance Manual 2-11 2 Troubleshooting...
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... TIMER CH.2 OUT ERROR CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR - - - - - - FIRST 64KB MEMORY ERROR FIRST 64KB MEMORY PARITY ERROR - - - - 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 In this instance, the IRT indicates an error has been...
... TIMER CH.2 OUT ERROR CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR - - - - - - FIRST 64KB MEMORY ERROR FIRST 64KB MEMORY PARITY ERROR - - - - 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 In this instance, the IRT indicates an error has been...
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Libretto 50CT/70CT Maintenance Manual 2-15 Refer to Chapter 3, Tests and Diagnostics, for ...checksum error Optional ROM or Optional Card (CGA,MDA) is detected during these steps: 1. System test (1) Memory test (2) Printer test (6) ASYNC test (7) Real Timer test (9) NDP test (10) Expansion test (11) Sound test... (12) If an error is connected Extended memory checksum error Instant on error (extended memory checksum error) Procedure 4 Diagnostic Test Program Execution and Replacement Checks Execute the following tests from the ...
Libretto 50CT/70CT Maintenance Manual 2-15 Refer to Chapter 3, Tests and Diagnostics, for ...checksum error Optional ROM or Optional Card (CGA,MDA) is detected during these steps: 1. System test (1) Memory test (2) Printer test (6) ASYNC test (7) Real Timer test (9) NDP test (10) Expansion test (11) Sound test... (12) If an error is connected Extended memory checksum error Instant on error (extended memory checksum error) Procedure 4 Diagnostic Test Program Execution and Replacement Checks Execute the following tests from the ...
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Table of Contents 3.1 The Diagnostic 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 3.10 Async Test...3-22 3.11 Hard Disk Test ...3-24 3.12 ... 3-42 3.20.2 Operations 3-42 3.21 Running Test ...3-44 3.21.1 Function Description 3-44 3.21.2 Operations 3-44 3.22 Floppy Disk Drive Utilities 3-45 3.22.1 Function Description 3-45 Libretto 50CT/70CT Maintenance Manual 3-iii
Table of Contents 3.1 The Diagnostic 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 3.10 Async Test...3-22 3.11 Hard Disk Test ...3-24 3.12 ... 3-42 3.20.2 Operations 3-42 3.21 Running Test ...3-44 3.21.1 Function Description 3-44 3.21.2 Operations 3-44 3.22 Floppy Disk Drive Utilities 3-45 3.22.1 Function Description 3-45 Libretto 50CT/70CT Maintenance Manual 3-iii
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... CONFIGURATION q EXIT TO MS-DOS q SETUP The DIAGNOSTIC TEST MENU contains the following functional tests: q SYSTEM TEST q MEMORY TEST q KEYBOARD TEST q DISPLAY TEST q FLOPPY DISK TEST q PRINTER TEST q ASYNC TEST q HARD DISK TEST q REAL TIMER TEST q NDP TEST q EXPANSION TEST q SOUND TEST Libretto 50CT/70CT Maintenance Manual 3-1 Check all cables for loose connections. 2.
... CONFIGURATION q EXIT TO MS-DOS q SETUP The DIAGNOSTIC TEST MENU contains the following functional tests: q SYSTEM TEST q MEMORY TEST q KEYBOARD TEST q DISPLAY TEST q FLOPPY DISK TEST q PRINTER TEST q ASYNC TEST q HARD DISK TEST q REAL TIMER TEST q NDP TEST q EXPANSION TEST q SOUND TEST Libretto 50CT/70CT Maintenance Manual 3-1 Check all cables for loose connections. 2.
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The following Diagnostic Test Menu displays: TOSHIBA personal computer xxx DIAGNOSTICS version X.XX (c) copyright TOSHIBA Corp. 19XX DIAGNOSTIC TEST MENU : 1 - REAL TIMER TEST 10 - SYSTEM TEST 2 - SOUND... To execute the Diagnostic Test Menu from the Diagnostics Menu, set the highlight bar to the Diagnostics Menu. 3-4 Libretto 50CT/70CT Maintenance Manual DISPLAY TEST 5 - HARD DISK TEST 9 - EXPANSION TEST 12 - Function 99 exits the...- EXIT TO DIAGNOSTICS MENU Refer to Sections 3.4 through 12. MEMORY TEST 3 - ERROR RETRY COUNT SET [HDD & FDD] 99 - ASYNC TEST 8 -
The following Diagnostic Test Menu displays: TOSHIBA personal computer xxx DIAGNOSTICS version X.XX (c) copyright TOSHIBA Corp. 19XX DIAGNOSTIC TEST MENU : 1 - REAL TIMER TEST 10 - SYSTEM TEST 2 - SOUND... To execute the Diagnostic Test Menu from the Diagnostics Menu, set the highlight bar to the Diagnostics Menu. 3-4 Libretto 50CT/70CT Maintenance Manual DISPLAY TEST 5 - HARD DISK TEST 9 - EXPANSION TEST 12 - Function 99 exits the...- EXIT TO DIAGNOSTICS MENU Refer to Sections 3.4 through 12. MEMORY TEST 3 - ERROR RETRY COUNT SET [HDD & FDD] 99 - ASYNC TEST 8 -
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Table 3-1 Subtest names (1/2) No. Test name 1 SYSTEM 2 MEMORY 3 KEYBOARD 4 DISPLAY 5 FDD 6 PRINTER Subtest No. 01 01 02 03 04 05 06 01 02 03 04 01 02 03 04 05 06 01 02 ... RAM constant data RAM address pattern data RAM refresh Protected mode Memory module Cache memory Pressed key display Not used PS/2 mouse connect check Pointing stick VRAM read /write Random address/data Write specified address Read specified address Ripple pattern Function Wraparound Libretto 50CT/70CT Maintenance Manual 3-7 3 Tests and Diagnostics 3.3 Subtest Names 3.3 Subtest Names...
Table 3-1 Subtest names (1/2) No. Test name 1 SYSTEM 2 MEMORY 3 KEYBOARD 4 DISPLAY 5 FDD 6 PRINTER Subtest No. 01 01 02 03 04 05 06 01 02 03 04 01 02 03 04 05 06 01 02 ... RAM constant data RAM address pattern data RAM refresh Protected mode Memory module Cache memory Pressed key display Not used PS/2 mouse connect check Pointing stick VRAM read /write Random address/data Write specified address Read specified address Ripple pattern Function Wraparound Libretto 50CT/70CT Maintenance Manual 3-7 3 Tests and Diagnostics 3.3 Subtest Names 3.3 Subtest Names...
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... address/data Cross talk & peak shift Write/read/compare (CE) Write specified address Read specified address ECC circuit Sequential write W-R-C specified address Real time Backup memory Real time carry NDP test PCMCIA wraparound FM synthesizer SINE-wave playback 3-8 Libretto 50CT/70CT Maintenance Manual 3.3 Subtest Names 3 Tests and Diagnostics Table 3-1 Subtest names (2/2) No.
... address/data Cross talk & peak shift Write/read/compare (CE) Write specified address Read specified address ECC circuit Sequential write W-R-C specified address Real time Backup memory Real time carry NDP test PCMCIA wraparound FM synthesizer SINE-wave playback 3-8 Libretto 50CT/70CT Maintenance Manual 3.3 Subtest Names 3 Tests and Diagnostics Table 3-1 Subtest names (2/2) No.
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...on the screen. Subtest 01 RAM constant data (real mode) This subtest writes a 256-byte unit of constant data to conventional memory (0 to extended memory (maximum address 100000h), then reads the new data and compares the result with the original data. Protected mode This subtest writes constant ...data and address data to 640 KB), then reads the new data and compares the result with the original data. 3-10 Libretto 50CT/70CT...
...on the screen. Subtest 01 RAM constant data (real mode) This subtest writes a 256-byte unit of constant data to conventional memory (0 to extended memory (maximum address 100000h), then reads the new data and compares the result with the original data. Protected mode This subtest writes constant ...data and address data to 640 KB), then reads the new data and compares the result with the original data. 3-10 Libretto 50CT/70CT...
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... → Fail Libretto 50CT/70CT Maintenance Manual 3-11 This subtest functions the same as subtest 04, except it is 8 MB or 16 MB. After selecting subtest 05, the following message displays: Extended memory size (1:8 MB,2:16 MB)? Memory module capacity is used for CPU cache memory. 3 Tests and Diagnostics 3.5 Memory Test Subtest 05 Memory module Subtest 06...
... → Fail Libretto 50CT/70CT Maintenance Manual 3-11 This subtest functions the same as subtest 04, except it is 8 MB or 16 MB. After selecting subtest 05, the following message displays: Extended memory size (1:8 MB,2:16 MB)? Memory module capacity is used for CPU cache memory. 3 Tests and Diagnostics 3.5 Memory Test Subtest 05 Memory module Subtest 06...
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Press Enter to 7Fh) The subtest reads and compares this subtest. Subtest 02 Backup memory This subtest performs the following backup memory check: Writes 1-bit of "off" data to addresses FEh, FB, FD through 80h Writes 1-bit of "on the screen. To execute the real time subtest ... Writes the data patterns AAh and 55h to 50-byte memory (addresses 0Eh to toggle between the time and the date. If the current time is not correct, input the correct date at the "Enter new date" prompt and press Enter. Libretto 50CT/70CT Maintenance Manual 3-27 If the current date is not...
Press Enter to 7Fh) The subtest reads and compares this subtest. Subtest 02 Backup memory This subtest performs the following backup memory check: Writes 1-bit of "off" data to addresses FEh, FB, FD through 80h Writes 1-bit of "on the screen. To execute the real time subtest ... Writes the data patterns AAh and 55h to 50-byte memory (addresses 0Eh to toggle between the time and the date. If the current time is not correct, input the correct date at the "Enter new date" prompt and press Enter. Libretto 50CT/70CT Maintenance Manual 3-27 If the current date is not...