Sony PRS-T1 Service Manual page 11

14. Write VCOM
In this mode, the VCOM voltage can be rewritten.
The VCOM voltage for INK INDICATOR 6inch ELEMENT is
individually different.
Therefor, when replacing the complete MAIN board or CHASSIS
ASSY (including INK INDICATOR 6inch ELEMENT) you need
to rewrite the VCOM voltage.
Procedure:
1. The VCOM voltage confi rm method is different according to
replaced parts.
When the complete MAIN board is replaced:
Disassemble this unit until the VCOM voltage is seen (Refer to
"2. DISASSEMBLY" (pages 3 to 7)), and confi rm the VCOM
voltage referring to the fi gure below. Record the confi rmed the
VCOM voltage by taking the memo etc..
Flexible board of INK
INDICATOR 6inch ELEMENT
-2.03
VCOM voltage
When the CHASSIS ASSY (including INK INDICATOR
6inch ELEMENT) is replaced:
Confi rm the VCOM voltage described on the label of new
CHASSIS ASSY (including INK INDICATOR 6inch ELE-
MENT). Record the confi rmed the VCOM voltage by taking
the memo etc..
2. Replace complete MAIN board or CHASSIS ASSY (including
INK INDICATOR 6inch ELEMENT) for new parts, and as-
semble this unit.
3. Make the text fi le on PC, and write the VCOM voltage con-
fi rmed in step 1.
Note 1: The VCOM voltage is described by the unit of mV that omits
minus (Example: Write "2030" when it is printed on the label as
"–2.03 V").
4. Press the [1] key to turn the power on.
5. Confi rm the HOME menu was completely displayed, and con-
nect this unit to PC by the USB cable (MICRO B).
6. Confi rm the USB connection screen displayed, and touch the
"Data Transfer Mode".
7. Confi rm the "READER" drive of this unit is recognized.
8. Make the following folder under the "READER" drive of this
unit.
/testmode/data/
9. Copy the text fi le made in step 3 to the "data" folder made in
step 8. Then, change the fi le name to "Vcom.dt".
10. Copy the fi le for the test mode from PC to directly under the
"READER" drive of this unit.
Note 2: When the fi le for the test mode already exists directly under the
"READER" drive of this unit, the fi le for the test mode need not
be newly copied.
11. Remove this unit and USB cable (MICRO B) from PC.
12. Enter the test mode (Refer to "HOW TO ENTER THE TEST
MODE" (page 8)).
13. Touch the "Write VCOM" in the test mode menu, and confi rm
current (unrenewed) VCOM voltage is displayed (Example:
-1854 mV in the fi gure below).
@Test Mode
Version: X.X.X
Target storage: Internal
Test Panal Update Waveform
Drawing with
Reset Device Lock
Points
Write VCOM
TP Coordinate Power Off
Status: 1854mV
Test All Key Log Extact 1
Whould you like to write?
Test Battery Life
New value: 2030mV
Temperature
Version
Write VCOM
Confirmation
Yes
Check Battery WWAN ON
Factory Initialize WWAN OFF
(Example of displaying current
(unrenewed) VCOM voltage)
14. Touch the "Yes", it starts rewriting the VCOM voltage.
15. Confi rm the VCOM voltage has been updated.
15. WWAN ON
This mode is not used in servicing.
16. WWAN OFF
This mode is not used in servicing.
17. IR-LED Level
This mode is not used in servicing.
18. Check 3G Module
This mode is not used in servicing.
19. Check User History
This mode is not used in servicing.
20. Switch ADB
This mode is not used in servicing.
21. Fake MoAkey
This mode is not used in servicing.
22. Reboot (Normal)
This mode is not used in servicing.
23. Reboot (Recovery)
This mode is not used in servicing.
24. Log Extact 2 (Flush)
This mode is not used in servicing.
PRS-T1
IR-LED Level
Check 3G Module
Check User
History
Switch ADB
Check
Fake MoAkey
Reboot (Normal)
No
Reboot (Recovery)
Log Extact 2
(Flush)
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