Sharp LC 20M4U, Service Manual

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LC-20M4U
12
1
> + B – A D J 1 6 0
M O D E L M 4 U
I N C H S I Z E 2 0
T I M E R 1
S Y S T E M A U T O
N T S C P W M F R E Q 0 C 0
P A L P W M F R E Q 0 B 0
T V G A I N O F F
E R R O R N O R E S E T 0
P M U T E 0 0
P U B L I C M O D E O N
C O L O R S W
2 0 M 4 V E R 1 . 0 0 0
Adjustment process
settings
Microprocessor
version
Adjustment process
items
Adjustment process page number
2. Lamp error detection
Function
For added safety, this LCD color TV set has the lamp error detection. The power is automatically turned off if the lamp
or its circuit gets in trouble.
If by any chance there is a problem with the lamp or its circuit, or if the lamp error detection function is activated for any
other reason, the set behaves itself as follows.
1 Even when you switch on the power, the set turns itself off in about 5 seconds. (The power LED indicator on the
front of the set turns from green to red.)
2 If the above action 1 occurs 5 times consecutively, the set cannot be switched on. (The power LED indicator stays
in red.)
Correction
●
Checking with the lamp error detection circuit off
If the lamp error detection fuction is activated to turn off the power LED indicator turns red and the set is now in the
adjustment process mode. In this state, the error detection circuit gets disabled and the power is turned on again.
In so doing, the lamp and its circuit can be checked for anything unusual.
Check to see if “1” or higher value appears in the “ERROR NO RESET” box in the 9th line of the adjustment
process page 1. If so, a lamp error has been detected.
●
Resetting the lamp error counter
Finally make sure the lamp and its circuit are error-free, and reset the lamp error counter. To do so, select the
“ERROR NO RESET” box in the 9th line of the adjustment process page 1 and enter “0” with the VOL button.
Do the performance check and make sure the lamp error detection functions is not activated.
3. Precautions in making adjustments
In making adjustments, keep the following points in mind.
●
When you have modified the MODEL and INCH SIZE settings on the process page 1, never turn off the power in
at least 5 seconds. It takes this time to write the E
2 PROM for all the adjustment process parameters of a different
mode. (The cursor does not move for a few seconds when the writing is going on.) If you have wrongly turned off
the power, once change the MODEL setting to any other model number, wait for 5 seconds, and change the setting
back to the right model number. Then wait for another 5 seconds just to be sure.
●
To quit the adjustment process mode with adjustments complete, use the ADJUST PROCESS key on the remote
contoller.
4. Adjustment process items