Sharp Aquos LC-20S1M, Service Manual

Page: 12 / 76

12
LC-20S1M
ADJUSTING PROCEDURE OF EACH SECTION
The best adjustment is made before shipping. If any position deviation is found or after part replace is performed, adjust
as follows.
Preparation for Adjustments
Use the exclusive-use AC adapter or stable DC power supply.
AC adapter: UADP-A043WJPZ
DC power supply: 12 ± 0.5V 5.0A
1. Adjustment Procedure
1-1. Adjusting the checker
Turning on the power (initialization)
→
Setting the model and size in inches
→
Transferring the model-specified
data to the E
2
PROM (I
2
C)
→
Calling the adjustment process mode
→
Starting the adjustment (+B adjustment)
1-2. Adjusting the finish process
Reassembling the set
→
Turning on the power
→
Calling the adjustment process mode (using the remote
controller)
→
Adjusting the counter bias, TV contrast and white balance
2. Calling the MAIN adjustment process mode
There are the following two ways to choose from.
• Set the Pin (81) (KEY4) or Pin (82) (KEY5) of IC2001 (microprocessor) to "L", turn on the power.
• For servicing, hold down the "TV/VIDEO" and "MENU" keys at once, and turn on the "POWER" switch. (Make
sure the process mode "K" appears at the top left of the screen.) Then press the "CH (
Ù
)" and "VOL (–)" keys
at once. (Make sure the adjustment process mode screen shows up.) To quit this mode, turn off the power. (Or
turn off the "POWER" switch or use the remote controller’s "OFF" key.)
3. Using the keys for the adjustment process
Selecting a reception channel
• Using the "CH (
ù
)/(
Ù
)" key, turn up and down reception (broadcasting) channels.
Just click on the key, and channels are selected on by one.
Hold down the key, and the next receivable channel is searched up and down.
• Adjustment items
Adjust each of the items by using the "MENU", "CURSOR UP/DOWN" and "VOL (+)/(–)" keys (on the set or on
the remote controller).
• Select an adjustment item using the "CURSOR UP/DOWN" key.
• An adjustment item is toggled on and off by activating the MENU SELECT key (next item).
Let’s suppose that the item at the bottom of a page is now selected. When the "MENU" key is activated here, the
item at the top of the next page will be selected.
4. Initialization
4-1. Set pins (81) and (82) of IC2001 (microprocessor) to GND. Turn on the power.
4-2. Select the inch size (20).
4-3. Select the model number "A641M".
~
Once "A641M" has been selected, the screen shuts off and the power turns off. But the power turns
itself on to get the set restarted. (The microprocessor resets itself due to a change in model number.)