Adjustment Precautions - Sharp 21YF30 Service Manual

ADJUSTMENT PRECAUTIONS

This model's setting are adjusted in two different ways: through the I
analog manner. The adjustments via the I 2 C bus control include preset-only items and variable data.
CAUTION : MAKE SURE TV SET IN "NORMAL CONDITION" BEFORE SWITCH TO SERVICE MODE FOR
ADJUSTMENT.
1. Setting the service mode by the microprocessor.
1.
Short JA 304 & JA 307 , then tv set will switch to the service mode position, and the microprocessor
is in input mode. (Adjustment through the I2C bus control). (Use JWS Key to set as well).
2 .
Press the MENU key on the remote controller to get ready to select the mode (Adjustment
mode, Setting mode, Check mode and Option mode) one by one.
3.
Press the CH DOWN / UP key on the remote controller to select the items in Adjustment mode,
Setting mode and Option mode.
4.
Using the VOLUME UP/ DOWN key on the remote controller, the data can be modified.
5.
In Check mode the data cannot be changed.
6.
Disable the short of JA 304 & JA 307, it will switch to the normal mode (OFF) position, and the
microprocessor is out of the service mode.
2.Factory Presetting.
1.
Short JA 304 & JA 307, then turn ON the main power and release the shorted JA304 & JA307
after raster appeared on the screen. Initial values are automatically preset, only when a new
EEPROM is used. (Judge with the first 4 bytes.)
2.
The initial data are preset as listed in page 4-2, 5-1, 5-2 & 6-2.
3.
Make sure the data need modification or not(Initial data).
Note: Once the chassis has been assembly together and ready to be POWER ON for the FIRST TIME, make
sure to short JA304 & JA307 to switch to the service mode position first and then turn on the main
1 above). 1 1 1
power switch (See 2-1
Precaution: If haven't done this initiation, it may possibly generate excessive Beam current.
3. For reference please check with memory map.
2
C bus control and in the conventional
3-1
ADJUSTMENT ITEM
***Below is the adjustment items that we should done, PLS FOLLOW THE PROCEDURE.
Otherwise some adjustment items will not be accurate.
NO *** ADJUSTMENT ITEM
1 BUS SET UP
2 OPTION SET UP
3 V-SIZE (50 Hz)
4 V-SHIFT (50 Hz)
5 H-SHIFT (50 Hz)
6 H-VCO
7 VIF-VCO
8 S-TRAP fo
9 RF-AGC
10 PURITY ADJ
11 CONVERGENCE ADJ
12 FOCUS ADJ
13 SCREEN
14 WHITE BALANCE
15 SUB-BRIGHTNESS
16 SUB-CONTRAST
17 SUB-TINT
18 SUB-COLOR
19 MAX BEAM CHECK
20 BEAM PROTECTOR CHECK
21 HV PROTECTOR CHECK
22 OTHER PROTECTOR CHECK
23 AV OUT CHECK
24 AV IN CHECK
25 CONTRAST CONTROL CHECK
26 COLOR CONTROL CHECK
27 BRIGHTNESS CONTROL CHECK
28 TINT CONTROL CHECK
29 SHARPNESS CONTROL CHECK
30 CH DISPLAY COLOR CHECK
31 NORMAL DISPLAY CHECK
32 WHITE TEMP CONTROL CHECK
33 COLOR SYSTEM CHECK
34 SOUND SYSTEM CHECK
35 NOISE MUTE CHECK
36 HEAD PHONE CHECK
EFFECTIVE MODEL REVISION
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