Sharp LC-28HM2E (serv.man2) Service Manual ▷ View online
25
LC-28HM2
AN-28SP2
OPERATIONS IN PROCESS ADJUSTMENT
<Basic functions for adjustment>
Cursor button up/down
: Page backward/forward
Channel selection up/down : 1 line backward/forward
Menu: 1 line forward
Cursor button left/right
Menu: 1 line forward
Cursor button left/right
: Adjustment value –16/+16
Volume up/down
: Adjustment value +1/–1
<Video source switching function> (See below.)
Input selection
: Input switch (Including frequency mode)
AV button
: Input switch (In every input source)
→
Video 1 (Composite)
→
Video 1 (S)
→
Video 2 (Composite
→
Video 2 (S)
→
Video 3
→
→
Component 1 (15k)
→
Component 1 (31k)
→
Component 1 (33k)
→
Component 1 (45k)
→
→
Component 2 (15k)
→
Component 2 (31k)
→
Component 2 (33k)
→
Component 2 (45k)
→
PC
→
* Input selection switches the whole mode including the difference of frequency. AV button moves to the
border of input source.
PC button
: Input switch (Direct PC)
Video1/Video2/Video3 : Input switch (Direct video (composite))
1-12 buttons
1-12 buttons
: Special functions are allocated in the process adjustment.
(TV direct channel button)
1
Color system selection
2
To change the vertical frequency setting for component 15kHz (50Hz/60Hz)
3
Unused
4
To switch the color system to N358
5
To switch the color system to PAL
6
To switch the color system to SECAM
7
To switch to component 15kHz/60Hz
8
Unused
9
Unused
10
Unused
11
Unused
12
Unused
<Special buttons>
Screen display button : Display and non-display of OSD. (Some functions, E
2
P initialization for example,
are disabled under non-display condition.)
End button
: Wide-view function switch
1-10 buttons
: After displaying solid screen in G/A TESTPAT, enter 3-digit figures using these keys
and press ENTER to set the luminance level.
Preset button
: Make presetting
Brightness (Toggle) : Brightness selection is done in the sequence of BRIGHT, MEDIUM and DARK.
Brightness (Direct) : Brightness can be set directly to BRIGHT, MEDIUM or DARK.
Brightness (Direct) : Brightness can be set directly to BRIGHT, MEDIUM or DARK.
26
LC-28HM2
AN-28SP2
<Items executed by ENTER button operation>
The following items are put into actual execution by switching the relevant line display from “OFF” to “ON” and then
pressing the ENTER button.
pressing the ENTER button.
P6L5
CENT EEP RST S/C ONLY
Initializing the center side EEPROM Sharp Corporation control
area (excluding accumulation time and +B ADJ)
P6L6
MONITOR EEP RST
Initializing the monitor side EEPROM
P6L7
UPDATE CENTER PROGRAM
Starting updating program for center microprocessor
(terminating the process adjustment)
P6L8
UPDATE MONITOR PROGRAM
Starting updating program for monitor microprocessor
(terminating the process adjustment)
P7L1
CENTER ACUTIME RESET
Resetting center accumulation time
P7L2
MONITOR ACUTIME RESET
Resetting monitor accumulation time
P27L1
INDUSTRY INIT
Presetting (Presetting is described separately.)
P1L7
LAMP NG CHECK
Resetting the times of lamp errors counted
P6L14
I2C DATA
Writing in the I
2
C data set separately (For test)
P7L11
NOISE LEVEL
Measuring the noise level of N358 video signal (For test)
The following items are put into execution by positioning the cursor on the relevant line and then pressing the
ENTER button.
ENTER button.
P5L13
DATA COPY
Copying the adjusted data into relevant part in other color
system
<Items executed by adjustment button operation (such as VOL button)>
The following items are executed immediately after switching the relevant line display from “OFF” to “ON”.
»
Additional explanation on some items
P27L1
MIN TO MAX~
Changing the selected item in the sequence of MIN, MEDIUM
and MAX by pressing the adjustment button (such as VOL +/–)
P27L13 RASTER
Displaying the single color solid signal in the following
sequence by pressing the adjustment button
Red
→
Green
→
Blue
→
White
→
Black
P27L14 DUTY SELECT
Switching the brightness to BRIGHT, MEDIUM or DARK
P27L15 REVERSE MODE
Displaying the video reverse in the following sequence by
pressing the adjustment button. The OSD does not appear
during the single color display.
Normal
→
Up/down reverse
→
Right/left reverse
→
→
Up/down & right/left reverse
P27L16 AV IN/OUT
Switching video 3 input and monitor output
27
LC-28HM2
AN-28SP2
ADJUSTING PROCEDURE
(1) AVC system chassis pre-adjustment
Adjusting point
Adjusting conditions
Adjusting procedure
1
AVC system +B
adjustment
(P2L1:
+BADJ CENTER)
adjustment
(P2L1:
+BADJ CENTER)
1. Connect DC voltmeter to
L806 on the side as shown
in the figure.
in the figure.
1. Adjust DC/DC 5V line output voltage to 5.0 ±0.05V.
2
Model selection
(P1L3:
MODEL SELECT)
(P1L3:
MODEL SELECT)
1. In the case of LC28HM2E, confirm that the setting is
“HM2E”.
Connect voltmeter
here.
here.
L806
(2) NTSC signal adjustment (Adjustment item appearing on the 1st line of page 1 is described as P1L1.)
Adjusting point
Adjusting conditions
Adjusting procedure
1
Color system setting
1. Feed the NTSC video
signal.
1. If “N358” is not found in the last part of the 1st line,
press [ 4 ] button of the remote controller to switch to
“N358”.
“N358”.
2
NTSC BRIGHT
adjustment
adjustment
1. Feed the color bar signal
carrying NTSC composite
100% white and 0% white
(pedestal black).
100% white and 0% white
(pedestal black).
(Example)
1. Adjust (P2L4) C N358 BRIGHT, so that the pedestal
black portion has the largest green area. If there is
no change against lowering the value, it is likely that
the adjustment point (“a” in the figure below) is
deviated from the correct point. In this case, once try
to increase the adjustment value.
no change against lowering the value, it is likely that
the adjustment point (“a” in the figure below) is
deviated from the correct point. In this case, once try
to increase the adjustment value.
2. After above adjustment is finished, deduct 16 from
the present adjustment value for final setting. (Press
“Left” button of the remote controller once to reduce
16 from the value.)
“Left” button of the remote controller once to reduce
16 from the value.)
The portion
referred to here
referred to here
Green level
Adjustment value
Adjust to this point
a
3
BRIGHT adjustment
value copy
value copy
1. Operate the adjustment button in the line (P2L5) BR
SET FROM N358. It works all right if “ON” appears
first and then “OFF” appears.
first and then “OFF” appears.
28
LC-28HM2
AN-28SP2
Adjusting point
Adjusting conditions
Adjusting procedure
4
NTSC CONTRAST
adjustment
adjustment
1. Feed the color bar signal
carrying NTSC composite
100% white and 0% white
(pedestal black).
100% white and 0% white
(pedestal black).
1. Adjust (P2L6) C N358 CONTRAST, so that the 100%
white portion has the largest green area.
5
NTSC R DRIVE
adjustment
adjustment
1. Feed the color bar signal
carrying NTSC composite
100% white and 0% white
(pedestal black).
100% white and 0% white
(pedestal black).
1. Adjust (P2L7) C N358 R DRIVE, so that the 100%
white portion has the largest red area.
The portion referred to here
The portion referred to here
6
NTSC B DRIVE
adjustment
adjustment
1. Feed the color bar signal
carrying NTSC composite
100% white and 0% white
(pedestal black).
100% white and 0% white
(pedestal black).
1. Adjust (P2L8) C N358 B DRIVE, so that the 100%
white portion has the largest blue area.
7
NTSC COLOR
adjustment
adjustment
1. Feed the color bar signal
carrying NTSC composite
100% white and 0% white
(pedestal black).
100% white and 0% white
(pedestal black).
1. Adjust (P2L9) C N358 COLOR, so that the 100%
blue portion has the largest blue area.
The portion referred to here
The portion
referred to here
referred to here
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