SHARP LC-20S1M _ ADJUSTMENT PROCEDURE_SERVICE MODE_ INITIALIZATION _ LAMP ERROR DETECTION

Use the exclusive-use AC adapter or stable DC power supply.

AC adapter: UADP-A043WJPZ

DC power supply: 12 ± 0.5V 5.0A.

• Adjusting the checker

Turning on the power (initialization) => Setting the model and size in inches => Transferring the model-specified data to the E2PROM (I2C) => Calling the adjustment process mode => Starting the adjustment (+B adjustment).

• 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

MAIN ADJUSTMENT PROCESS MODE

1. Set the Pin (81) (KEY4) or Pin (82) (KEY5) of IC2001 (microprocessor) to "L", turn on the power.
2. 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 (UP)" and "VOL (–)" keys at once. (Make sure the adjustment process mode screen shows up.) 
3. To quit this mode, turn off the power. (Orturn off the "POWER" switch or use the remote controller’s "OFF" key.).

ADJUSTMENT PROCESS KEYS

• Using the "CH (UP)/(DN)" 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.

INITIALIZATION

• Set pins (81) and (82) of IC2001 (microprocessor) to GND. Turn on the power.
• Select the inch size (20).
• 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.)

+B ADJUSTMENT

1. Receive the colour bar signal.
2. Adjust the voltage at pin (4) of P3701 to 5.00 ± 0.02 V.

Note: The 5.0 V level is used as reference for all the line voltages. Make this adjustment as precisely as possible.

LAMP ERROR DETECTION

• The main unit of television is turned off 5 seconds after it is turned on. (The power LED on the front side of TV turns from green to red.)
• If the situation 1 happens 5 times sequentially, television can not be turned on. (The power LED remains red.)

Check when turning off the lamp error detection

• When television is turned off by the lamp error detection mentioned above, it enters the adjustment process with the power LED red. Entering the adjustment process turns off the error detection and turns on TV.
• This enables the operation check to detect errors in the lamp or lamp circuit.
• Check whether "ERROR NO RESET" on line 4, page 1 of the adjustment process is 1 or more. If it is 1 or more, it indicates the lamp error detection was execute.

RESETTING OF LAMP ERROR COUNT

• After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO RESET" on line 4, page 1 of the adjustment process and set the number to 0 using the volume button.