Toshiba Libretto 50CT/70CT Manual

							3.2  Executing the Diagnostic Test3  Tests and Diagnostics3-6Libretto 50CT/70CT Maintenance ManualThese three selections have the following functions respectively:
1. Terminates the test program and exits to the subtest menu.
2. Continues the test.
3. Restarts the test from the error.
Use the arrow keys to move the cursor to the desired option and press Enter.
Select NO for ERROR STOP to keep the test running even if an error is found.
Table 3-1 in Section 3.3 lists the function of each test on the subtest menu. Table 3-2
in Section 3.16 lists the codes and statuses for each error. 
						

							3  Tests and Diagnostics3.3  Subtest NamesLibretto 50CT/70CT Maintenance Manual3-73.3 Subtest NamesTable 3-1 lists the subtest names for each test program on the Diagnostic Test Menu.Table 3-1 Subtest names (1/2)
No.Test nameSubtest No.Subtest item1SYSTEM01ROM checksum2MEMORY01RAM constant data02RAM address pattern data03RAM refresh04Protected mode05Memory module06Cache memory3KEYBOARD01Pressed key display02Not used03PS/2 mouse connect check04Pointing stick4DISPLAY01VRAM read/write for VGA02Gradation for VGA03Gradation for LCD04Gradation & mode test for VGA05All dots on/off for LCD06“H” pattern display5FDD01Sequential read02Sequential read/write03Random address/data04Write specified address05Read specified address6PRINTER01Ripple pattern02Function03Wraparound 
						

							3.3  Subtest Names3  Tests and Diagnostics3-8Libretto 50CT/70CT Maintenance ManualTable 3-1 Subtest names (2/2)
No.Test nameSubtest No.Subtest item7ASYNC01Wraparound (board)02Point to point (send)03Point to point (receive)04Interrupt test05Infra_red wrap_around test06Infra_red transmit mode07Infra_red receive mode8HDD01Sequential read02Address uniqueness03Random address/data04Cross talk & peak shift05Write/read/compare (CE)06Write specified address07Read specified address08ECC circuit09Sequential write10W-R-C specified address9REAL TIMER01Real time02Backup memory03Real time carry10NDP01NDP test11EXPANSION01PCMCIA wraparound12SOUND01FM synthesizer02SINE-wave playback 
						

							3  Tests and Diagnostics3.4  System TestLibretto 50CT/70CT Maintenance Manual3-93.4 System TestTo execute the System Test select 1 from the Diagnostic Test Menu, press Enter and follow
the directions on the screen. The System Test contains one test that tests the system. Move
the highlight bar to the subtest you want to execute and press Enter
.Subtest 01ROM checksum
This subtest executes a checksum test of the BIOS ROM on the system board. 
						

							3.5  Memory Test3  Tests and Diagnostics3-10Libretto 50CT/70CT Maintenance Manual3.5 Memory TestTo execute the Memory Test select 2 from the Diagnostic Test Menu, press Enter and
follow the directions on the screen.  The Memory Test contains six subtests that test the
computer’s memory.  Move the highlight bar to the subtest you want to execute and pressEnter
.Subtest 01RAM constant data (real mode)
This subtest writes a 256-byte unit of constant data to conventional memory (0
to 640 KB), then reads the new data and compares the result with the original
data.
The constant data is FFFFh, AAAAh, 5555h, 0101h, and 0000h.
Subtest 02RAM address pattern data (real mode)
This subtest writes address pattern data created by the exclusive-ORing
(XORing), to the address segment and address offset in conventional memory
(from program end to 640 KB), then reads the new data and compares the
result with the original data.
Subtest 03RAM refresh (real mode)
This subtest writes a 256-byte unit of constant data to conventional memory (0
to 640 KB), then reads the new data and compares the result with the original
data.
The constant data is AAAAh and 5555h.
NOTE: There is a short delay between write and read operations,depending on the size of the data.Subtest 04Protected mode
This subtest writes constant data and address data to extended memory
(maximum address 100000h), then reads the new data and compares the result
with the original data. 
						

							3  Tests and Diagnostics3.5  Memory TestLibretto 50CT/70CT Maintenance Manual3-11Subtest 05Memory module
NOTE: To execute this subtest, an optional memory card must beinstalled in the computer.This subtest functions the same as subtest 04, except it is used for testing an
optional memory card.  Memory module capacity is 8 MB or 16 MB.
After selecting subtest 05, the following message displays:
Extended memory size
(1:8 MB,2:16 MB)?
Select the number that corresponds to the memory card installed in the
computer.
Subtest 06Cache memory
To test the cache memory, a pass-through write-read comparison of ‘5A’ data
is run repeatedly to the test area (‘7000’:’Program’ size to ‘7000’:’7FFF’ (32
KB)) to check the hit-miss ratio (on/off status) for CPU cache memory.  One
test takes 3 seconds.
Number of misses < Number of hits ® OK
Number of misses ³ Number of hits ® Fail 
						

							3.6  Keyboard Test3  Tests and Diagnostics3-12Libretto 50CT/70CT Maintenance Manual3.6 Keyboard TestTo execute the Keyboard Test select 3 from the Diagnostic Test Menu, press Enter and
follow the directions on the screen.  The Keyboard test contains three subtests that test the
keyboard, PS/2 mouse, and AccuPoint actions.  Move the highlight bar to the subtest you
want to execute and press Enter
.Subtest 01Pressed key display
NOTE: The Num Lock
 and the Overlay mode must be off to execute thissubtest.When you execute this subtest, the keyboard layout is drawn on the display as
shown below.  When any key is pressed, the corresponding key on the screen
changes to the corresponding character.  Holding a key down enables the auto-
repeat function which causes the key’s display character to blink.
>If test OK, Press [Del] [Enter] Key
Subtest 02Pressed key code display - not used
Subtest 03PS/2 mouse connect check
NOTE: To execute the PS/2 mouse connect check, a PS/2 mouse must beconnected to the computer before the power is turned on.This subtest checks whether a PS/2 mouse is connected. 
						

							3  Tests and Diagnostics3.6  Keyboard TestLibretto 50CT/70CT Maintenance Manual3-13Subtest 04Pointing stick
This subtest checks the functions of the pointing stick as shown below.
A) IPS stick pressure sensing direction and parameter.
B) IPS switch function check.
This test reports the pointing stick motion response from the IPS and IPS
switch.  When the stick is pressed towards the upper left, the display changes according to the following illustration.  If an IPS switch is
pressed, the 
 display alternates between black and white.  Also, the
parameters appear on the right side of the display.
If two IPS switches are pressed at the same time, the subtest menu is
displayed. 
						

							3.7  Display Test3  Tests and Diagnostics3-14Libretto 50CT/70CT Maintenance Manual3.7 Display TestTo execute the Display Test select 4 from the Diagnostic Test Menu, press Enter and follow
the directions on the screen.  The Display test contains six subtests that test the display in
various modes.  Move the highlight bar to the subtest you want to execute and press Enter
.Subtest 01VRAM Read/Write for VGA
This subtest writes constant data AAh and 55h and address data to video RAM
(2MB: A0000h-AFFFFh).  This data is then read from the video RAM and
compared to the original data.
Subtest 02Gradation for VGA
This subtest displays four colors: red, green, blue, and white from left to right
across the screen from black to maximum brightness. The image below
displays on the screen when this subtest executes.To exit this subtest and return to the DISPLAY TEST menu, press Ctrl +
Break.
Subtest 03Gradation for LCD
This subtest displays eight colors: red, semi-red, green, semi-green, blue, semi-
blue, white, and semi-white. Each color displays full screen for three seconds. 
						

							3  Tests and Diagnostics3.7  Display TestLibretto 50CT/70CT Maintenance Manual3-15Subtest 04Gradation & mode test for VGA
This subtest displays gradations for each mode. Execute the test, then press
Enter to change the mode.
ResolutionMode640 x 4803, 12, 13The image below displays on the screen when this subtest executes.Pressing Enter changes the size of the displayed image.Pressing Enter
 changes the size of the displayed image.