Read Sharp LC-15M4E (serv.man2) Service Manual online
10
LC-15M4E
ADJUSTING PROCEDURE OF EACH SECTION
When the microprocessor (IC2001) or the EEPROM (IC2004) has been replaced or when the EEPROM has been
initialized, it is necessary to readjust the microprocessor. Below discussed is the adjustment procedure.
* When the microcomputer is replaced by a new version, be sure to replace the EEPROM too.
initialized, it is necessary to readjust the microprocessor. Below discussed is the adjustment procedure.
* When the microcomputer is replaced by a new version, be sure to replace the EEPROM too.
Preparations
Use a dedicated AC adaptor or a regulated DC power supply.
AC adaptor
Use a dedicated AC adaptor or a regulated DC power supply.
AC adaptor
: UADP-0226CEPZ
DC power supply : 12 V, 3.2 A
Use also a Sharp-made TV remote controller.
Use also a Sharp-made TV remote controller.
1. Adjustment procedure
Power on (initialization)
→
Adjustment process mode (remote controller)
→
+B adjustment
→
Counter bias adjustment
→
Other settings
→
Performance check
→
Factory settings
Calling the adjustment process mode
There are two ways to enter this mode.
There are two ways to enter this mode.
»
Turn on the power and press the “ADJUST PROCESS” key on the remote controller.
»
While holding either KEY4 (pin (81) of the microprocessor) or KEY5 (pin (82) of the microprocessor) at the “L”
level, turn on the power.
level, turn on the power.
Using the keys for the adjustment process
Selecting an adjustment item and adjusting its setting
Selecting an adjustment item and adjusting its setting
»
Using the menu button (M key), select an item, and using the VOL (+)/(-) buttons, adjust its setting. (The menu
button serves as a toggle switch. New settings entered with the VOL buttons are made effective immediately.)
button serves as a toggle switch. New settings entered with the VOL buttons are made effective immediately.)
Other key-in behaviors
»
The input select key serves also as a toggle switch.
The input is switched from AV1 to AV2.
»
Press the auto preset button on the remote controller in the adjustment process mode, and the top item of the
next page will show up regardless of which item appears now.
Page 1
next page will show up regardless of which item appears now.
Page 1
→
Page 2
→
...
→
Page 6
→
Page 1
»
Press the manual memory button on the remote controller in the adjustment process mode, and the top item of
the same page will show up.
the same page will show up.
2. Initialization
Ground two pins (81) and (82) of IC2001 (microprocessor) and turn on the power. The unit will be initialized and
then enter the adjustment process mode.
Select M4E in the MODEL item. Adjustment process page 1.
Select 15 in the INCH SIZE item. Adjustment process page 1.
Turn off the power and get the pins (81) and (82) of IC2001 (microprocessor) back to their original state.
* Before turning off the power, quit the adjustment process mode with the remote controller. If unavoidably
then enter the adjustment process mode.
Select M4E in the MODEL item. Adjustment process page 1.
Select 15 in the INCH SIZE item. Adjustment process page 1.
Turn off the power and get the pins (81) and (82) of IC2001 (microprocessor) back to their original state.
* Before turning off the power, quit the adjustment process mode with the remote controller. If unavoidably
the power must be switched off directly, wait at least 5 seconds after making the settings.
3. +B adjustment
Feed the standard NTSC color bar signal.
Enter the adjustment process mode.
Adjust the “+B-ADJ” setting on the adjustment process page 1 so that the voltage at pin (5) of P2001 should be
5.00 ±0.02 V.
Note: Make the 5.0 V adjustment as exactly as possible because this voltage will be reference level for all
Enter the adjustment process mode.
Adjust the “+B-ADJ” setting on the adjustment process page 1 so that the voltage at pin (5) of P2001 should be
5.00 ±0.02 V.
Note: Make the 5.0 V adjustment as exactly as possible because this voltage will be reference level for all
the supply voltages.
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