Sharp GX20 Service Manual - Page 43

Den: 075

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CONFIDENTIAL 3. Main display flicker adjustment procedure 1. Attach the battery pack. 2. Access the manual testmode. 3. Access the manual testmodeF81 (LCD Setting) by pressing the "8", "1" and "Right Soft" keys in this order. 4. Press the "2" (2. VCOM Adjust) key. GX20 5. Adjust the flickers on the screen to the minimum by pressing the " " and the " " keys. Make sure visually they are minimized at a distance of about 20 cm from the inverter fluorescent lamp. (Fine adjustments to the DC voltage between display electrodes) Enlargement (Add a black line at every one line) 58 Current set value 8 gradation patterns with a black line between each line of the patterns (monochrome pattern) Figure 70 6. Press the "Centre" key twice. The corrected value is registered. 7. Press the "End/Power" key to exit this mode. 4. External display contrast adjustment 1. Attach the battery pack and then connect the Data cable. 2. Hold down the "End/Power" key for startup in the normal mode. 3. Send the [AT+XDIAG] command to receive the response [DIAGREADY]. 4. Send the [PWRFON] command to receive the response [OK]. 5. Send the [PWRDOWN] command to power off. 6. Hold down the "End/Power" key to display "****". 7. Press the "3" key to display "H/W CHECK *GX20*" and then to access the test mode. 8. Press the "8" key to show the following pattern on the external display. Current set value Den: 075 8 gradation pattern (Monochrome pattern) Figure 71 9. Use " " or " " key to adjust the gradation pattern by comparing it with the other one already adjusted at the plant. 10.Press the "Centre" key to show [Save OK.] on the external display. Then the adjusted value is entered. 11. Press the "0 key to access the initial screen of the function test mode. 12.Press the "End/Power" key to power off. 13.Connect the Data cable and then hold down the "End/Power" key to display "****". 14.Press the "2" key to display "Function Mode *GX20*". 15.Send the [PWRFOFF] command to receive the response [OK]. 16.Send the [PWRDOWN] command to power off. 17.Hold down the "End/Power" key to check for startup in the normal mode. 18.Hold down the "End/Power" key to power off. 2 - 37

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GX20
2 – 37
CONFIDENTIAL
3. Main display flicker adjustment procedure
1.
Attach the battery pack.
2.
Access the manual testmode.
3.
Access the manual testmodeF81 (LCD Setting) by pressing the “8”, “1” and “Right Soft” keys in this order.
4.
Press the “2” (2. VCOM Adjust) key.
5.
Adjust the flickers on the screen to the minimum by pressing the “
” and the “
” keys. Make sure visually they are minimized at a distance of
about 20 cm from the inverter fluorescent lamp. (Fine adjustments to the DC voltage between display electrodes)
Figure 70
6.
Press the “Centre” key twice. The corrected value is registered.
7.
Press the “End/Power” key to exit this mode.
4. External display contrast adjustment
1.
Attach the battery pack and then connect the Data cable.
2.
Hold down the "End/Power" key for startup in the normal mode.
3.
Send the [AT+XDIAG] command to receive the response [DIAGREADY].
4.
Send the [PWRFON] command to receive the response [OK].
5.
Send the [PWRDOWN] command to power off.
6.
Hold down the "End/Power" key to display "****".
7.
Press the "3" key to display "H/W CHECK *GX20*" and then to access the test mode.
8.
Press the "8" key to show the following pattern on the external display.
Figure 71
9.
Use “
“ or “
“ key to adjust the gradation pattern by comparing it with the other one already adjusted at the plant.
10.Press the “Centre” key to show [Save OK.] on the external display.
Then the adjusted value is entered.
11.Press the "0 key to access the initial screen of the function test mode.
12.Press the "End/Power" key to power off.
13.Connect the Data cable and then hold down the "End/Power" key to display "****".
14.Press the "2" key to display "Function Mode *GX20*".
15.Send the [PWRFOFF] command to receive the response [OK].
16.Send the [PWRDOWN] command to power off.
17.Hold down the "End/Power" key to check for startup in the normal mode.
18.Hold down the "End/Power" key to power off.
Enlargement
(Add a black line at every one line)
8 gradation patterns with a black line between each line of the patterns (monochrome pattern)
58
Current set value
8 gradation pattern (Monochrome pattern)
Current set value
Den: 075