SONY PCVL620
Service Manual

SECTION 4 PROGRAMS FOR SERVICE
4-1. Diagnostics for Service 4-1-1. General
The diagnostic programs (Diag.) for service are all supplied with FD. The Diag. for service uses the QA Plus/Factory and it can test the mother board, CPU, memory, FDD, HDD, and CD-ROM or DVDROM. After it started up, the test is conducted automatically in an interactive style. Additional use of exclusive Diag. disk can test the LCD, memory stick, and PC card in the same manner. However, these programs do not support the extension boards (such as FAX MODEM board).

4-1-4. Test Result
At the completion of test, �PASS� (on green screen) or �FAIL� (on red screen) is displayed. If �FAIL� is displayed, refer to the log file through the operation of �E:\> type L620.log�. The item with �F� in the flag field indicates a failure. [Example]
0700:210:01 ; 0700:210:01 0700:210:01 0700:211:01 F ~~~ Starting CPU tests flag and register test math test shift and rotate test

� Flag field

4-1-2. Start-up 4-1-5. Memory Stick Test
Set the start disk (first disk) of Diag. for service in the FDD, and start up the MS-DOS. After start, the programs on the first disk are automatically installed. Then, install the programs on the second disk following the instruction given on the screen. After making sure that the program installation is finished and the model selection screen appears, remove the Diag. disk for service. Before starting the test, set a formatted 1.44 M floppy disk without write protection and a CD-ROM that can be recognized from the MS-DOS in respective drives. Then, following the screen messages, execute the tests in order. As the Diag. programs are installed on the RAM Disk, they are cleared when the power is turned off after the test completed. Note: For this test, a memory stick is required additionally. 1. Set the service diag. disk for memory stick in the FDD. 2. Insert the memory stick. 3. PC starts up automatically and the contents of disk are read, then the test starts. 4. In case of OK, �PASS� is displayed, or in case of failure, �ERROR� is displayed.

4-1-6. LCD Test
1. Start up the Windows98. 2. Insert the service diag. disk for LCD. 3. Click [Start] t Select [Run], then enter �A: LCD� and press OK. The LCD test will start, then perform operation following the screen message. 4. �Press ESC key when Ready to start� is displayed, then press [ESC] key. 5. �After confirming LED, Press Enter key� is displayed, then after confirming that the second top red LED on the right side of LCD ( :mail receiving information lamp) lights up, press [Enter] key to turn off the red LED. 6. Press [Enter] key to proceed to the next step. 7. The background becomes green and a display frame appears fully on the screen. After confirming that the screen does not wobble extremely, press [Enter] key. 8. The background becomes white. After confirming that uneven brightness or a black point (skipped dot) is not found, press [Enter] key. 9. The background becomes black. After confirming that a luminance point (bright dot) can be seen, press [Enter] key. 10. The background colors vary from white to black successively in upward direction of the screen. After confirming the gradation, press [Enter] key. 11. �Output Left� is displayed, and after confirming that the sounds are outputted from the left speaker, press [Enter] key. 12. �Output Right� is displayed, and after confirming that the sounds are outputted from the right speaker, press [Enter] key. 13. �Opening MCI Device...� is displayed, and after confirming that the MIDI file is played back, press [Enter] key. 14. �Prepared to Suspend� is displayed, and press the Standby key ( ) on the keyboard to activate the Standby (Suspend) mode. After confirming that the Power lamp (1) changes from green to orange, press [Enter] key to return to the Test mode.

4-1-3. Test Items
� Parallel LPT1, Serial COM1, Hard Disk These are tested automatically. � Floppy Disk A (1) Random Seek/Verify The test is conducted automatically. (2) Write Protect Test When �Insert write protected formatted diskette� is displayed on the screen, remove the FD once, and set the write protect notch, then reinsert the FD into FDD and select Continue�. (3) Disk Change Test When �Remove scratch diskette from floppy drive� is displayed on the screen, remove the FD from FDD and select �Continue�. Then, when �Re-insert scratch diskette into floppy drive� is displayed, reset the write protect notch and reinsert the FD, then select �Continue�. � Base Memory, Extended Memory These are tested automatically. � Audio Speaker Test Confirm beep sounds from the speaker, then when �Did you hear the speaker?� is displayed, select �Yes�. � Video, Keyboard, Sys Information, CD-ROM, DVD-ROM These are tested automatically.

4-1

PCV-L620