Sharp LC-20B2EA, Service Manual

Page: 10 / 66

10
LC-20B2EA
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 dedicated AC adaptor or stable DC power supply.
LC20E1E AC adaptor: UADP-0241CEPZ
DC power supply: 13V 5.4A
1. Adjusting procedure
• Checker adjustment
Power ON (Adjustment processing mode)
→
+B adjustment
→
Counter bias adjustment
→
TAMP (Contrast)
adjustment
→
White balance adjustment
2. Entering the adjustment processing mode
There are the following two methods.
• Setting the pin (81)(KEY4) or pin (82)(KEY5) of IC2001 (microprocessor) to GND, turn on the power.
• A “POWER” key is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.(K of the inspection
process mode is displayed by the upper left of the image plane.)
→
Next, “CH (
Ù
)” and “VOL (–)” keys are pushed
at the same time.(It becomes the image plane of the adjustment process mode.).....When it is canceled, it is made
to turn it off.(Even off in the “MAIN POWER” key, off with R/C are good.)
3. Key operation in the adjustment process mode
• The receiving channel UP/DOWN is performed with the “CH (
ù
)/(
Ù
)” keys.
One push ... The UP/DOWN tuning is performed per channel.
Continuous push ... The UP/DOWN search is performed until a next receivable station is found.
• Various adjustments
The adjustment is performed for each item by the “MENU”, “Menu cursor”, “CH (
ù
)/(
Ù
)” or “VOL (+)/(–)” keys
(LCD TV set and remote control).
• Adjustment item is chosen with the Menu cursor upward/downward keys.
• The adjustment item makes a toggle operation with the “MENU” key input. (Next item)
If the “MENU” key is input while the bottom item is selected, it moves to the top item on the next page.
• 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
→
Page 2
→
...
→
Page 22
→
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.
• UP/DOWN of each adjustment vale selected is performed with the VOL (+)/(–) keys input.
• For P16 – 17, the unit enters the register select mode with the VOL (+)/(–) keys input while NTSC/PAL is selected,
and the cursor moves to the address 01.
• The cursor moves up or down with the “CH (
ù
)/(
Ù
)” keys and moves left or right with the VOL (+)/(–) keys, and a
decision is made with the 12 key.
When the decision is made, the cursor moves to the adjustment value selected, and UP/DOWN of each adjustment
value selected by the “VOL (+)/(–)” keys input is performed.
0
↔
1
↔
...
↔
9
↔
A
↔
...
↔
F
↔
0
↔
...
Decide with the 12 key and return to the address select. Move to the next item with the “MENU” key.
During address select, the cursor movement by the “VOL (+)/(–)” keys input is as follows:
Example: 01
↔
02
↔
03
↔
01
↔
...
The cursor movement by the “CH (
ù
)/(
Ù
)” keys input is as follows:
Example: 02
↔
05
↔
...
↔
F6
↔
02
↔
...