Sony DVS-7200A Maintenance Manual page 126

3-6. Troubleshooting (BKDS-7025/7026)
3-6-4. Test Procedures
(3) Checking the test result
Check the followings on each item of the "EL test".
. The character font of the main screen uses the flash memory.
. The character font of the sub screen uses the ROM.
(a) "1. Main screen crosshatch test"
Check that the vertical and horizontal lines of the crosshatch pattern do not bend or disappear.
n
If there is any non-programmed memory, all elements of the EL display light.
(b) "2. Main screen character test"
Check that the alphanumeric characters are indicated.
(c) "3. Main screen scroll test"
Check that the alphanumeric character display of the item (b) scrolls in the vertical direction.
(d) "4. Main screen reverse test"
Check that the alphanumeric character display of the item (b) is partially highlighted in blocks.
= = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
α α α α α α α α α α α α
A A A A A A A A A A A A
B B B B B B B B B B B B
C C C C C C C C C C C C
D D D D D D D D D D D D
(e) "5. Main screen blink test"
Check that the partially highlighted portions of the item (d) blink.
(f) "6. Sub screen crosshatch test"
Check that the vertical and horizontal lines of the crosshatch pattern do not bend or disappear.
(g) "7. Sub screen character test"
Check that the alphanumeric characters are indicated.
(h) "8. Sub screen scroll test"
Check that the alphanumeric character display of the item (g) scrolls in the vertical direction.
(i) "9. Sub screen over test"
Check that the alphanumeric characters "S" are displayed in the alphanumeric characters "M" in
blocks shape.
(j) "10. Sub screen OR test"
Check that the alphanumeric characters "S" are displayed on the half-tone background.
(k) "11. All clear"
Check that all elements of the EL display light off.
(l) "12. All light"
Check that all elements of the EL display light.
(m) "13. EL disable test"
Check that all elements of the EL display light off.
(4) Ending the "EL test"
Press your required button on the terminal and the display returns to the "H/W Tester on CPU-263" menu.
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α α α α α α α α α α α α α α α α α α α α α
A A A A A A A A A A
B B B B B B B B B B
C C C C C C C C C C
D D D D D D D D D D
= = = =
A A A A A A A A A A A
B B B B B B B B B B B
C C C C C C C C C C C
D D D D D D D D D D D
DVS-7200AE MMP1