ATC113 ATC113 Page 3-2 Page 3-1 ALIGNMENT

Transcription

ATC113
ALIGNMENT PROCEDURES
Operating Conditions
Unless otherwise noted, the following conditions must be
observed when aligning the ATC113 chassis:
1. Chassis must be operated from a 120VAC isolation
transformer, with line voltage set to 120VAC (±2.0V).
2. Picture controls (brightness, contrast, etc.) must be set
to factory presets via the Picture Quality menu presets
item or reset on the remote transmitter.
3. Procedures must be performed in the sequence given.
4. A 10X probe must be used for oscilloscope and frequency measurements.
5. Minimum warm-up time is 10 minutes
Required Test Equipment
Personal Computer: IBM or Compatible 486DX 66 meg
PC (or LAPTOP) with 16 MEG Memory, VGA Monitor, one
3 1/2 floppy drive, 540 Meg or larger hard drive, compatible mouse, one parallel port dedicated for service interface
box and one port for mouse, Windows 95, 4X CD ROM,
Printer and Sound Card.
Isolation Transformer:
Digital Voltmeter: Range .1V DC to 1000V DC, Accuracy: ±
.5%/
True RMS Voltmeter: Range: 01 to 1000 Volts ± .5% Accuracy
DC Voltage Supply: Range: 0 to 50V, 2AWell Filtered
Temperature Controlled Soldering Station: Grounded Tip
TypeTip Temperature 500F to 800F Adjustable
Frequency Counter: Range: 50Hz to 100 MHz Sensitivity:
25mV to 5V. Equipped with Lo-Cap Probe (10:1 Attenuation)
AC Variac: Continuously Variable. Isolation Type Preferred
NTSC Video Signal Generator: Must provide 1V P-P Negative Sync, Video into 75-OHM input. Produce, standard NTSC
75% Saturated Color Bars with 100% White Window. (B&K
1249, or equivalent)
RF Signal Generator: 100 kHz to 150 MHz .1V RMS, Int.
Mod. 1KHz 30%
TAG001 Tuner Alignment Generator (stock # 215568) or
equivalent: Equivalent Generator must have RF output capabilities for cable channels 1-125.
Cross Hatch Generator: Must have RF output.
S-Video Source: Must provide standard Y-C separated signal. SVHS output of VCR, DSS or DVD will suffice
Dual Trace, Delayed Sweep Oscilloscope: 25 MHz with
Channel invert capability. Sensitivity 5mV/cm Maximum
Sweep Rate: .1us/cm.
Hot Air Desoldering Station:
MTS TV Stereo Generator: Must produce L-R, L+R, SAP at
300 Hz, 1KHz, 8KHz(B&K 2009, or equivalent).
Chipper Check® software:
Chipper Check® interface box
NOTE: All alignments with the exception of basic color
temperature and geometry require the use of Chipper
Check® software and interface box.
Service Mode
Most of the alignments for this chassis are software-driven.
Adjustments are made by modifying parameter values using
Chipper Check and the service menu. When parameter values are modified, the corresponding T-chip registers, tuner
registers and EEPROM locations are updated. A list of the
software alignment parameters accessible using the front panel
is shown in Table 1. All other alignments require Chipper
Check®
Using the Front Panel Controls to enter Service Mode
1.
2.
3.
Turn the instrument on.
Press and hold the MENU button.
a. Press and release the POWER button.
b. Press and release the VOL+ button.
Release the MENU button.
The following Service Mode Screen will be displayed.
Service Mode Screen
The Parameter (P) number is on the left side of the display
and represents the function that will be performed. The Value
(V) is on the right side of the display and represents the decimal value stored for the function selected. Once the Service
Mode Security Code has been entered the CH /\ and CH \/
buttons on the front panel (or the remote transmitter) are used
to change the parameter (P) number. The VOL + and VOL buttons are used to change the decimal value (V) of the function.
NOTE: When the service mode is accessed, the parameter
will be 0. Parameter 0 is used to input the security
code. The security code is necessary to protect the factory alignments from inadvertent modification. Attempting to change the parameter (P) using CH /\ or CH \/
before the proper security code has been entered will
cause the instrument to exit the service mode. A valid
security code is entered (using VOL + or VOL -)
Security Codes
When the Service Mode is first entered, the parameter (P)
will come up set at 0, which corresponds to the security
code function. With the parameter (P) set to 0 adjust the
value (V) (using VOL + or VOL -) to 76 for access to the
Front Panel Service Mode. Set the value (V) to 200 for Chipper Check® operation.
Page 3-1
ATC113
Once the security code has been set, individual alignments
can be accessed by pressing CH /\ or CH \/ changing the
parameter (P) number.
Once a parameter ( P ) has been selected for a particular
alignment the VOL + and VOL - buttons can be used to
change the value ( V ) of the alignments selected. Parameters available through the front panel are shown in table 1.
Parameter #
Parameter name
Value range
Notes and comments
Security pass- number, must be set to 76, must not advance to other parameters until value set
00
Instrument Parameter:
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Error Detection (1st)
Error Detection (2nd)
Error Detection (last)
Main RF_AGC
AKB OK Status
Red Cut-off
Green Cut-off
Blue Cut-off
RG Drive Gain
B Drive Gain
Sub Contrast
Sub Brightness
Sub Color
Sub Tint
Horizontal position
Vertical phase
Vertical Size
Vertical Centering
Vertical Linearity
VS Correction
Horizontal Size
EW Parabola Correction
EW Trapezium Correction
EW Correction Top
EW Correction Bottom
RF AGC for 2nd Tuner
Audio Input Level
Audio Stereo VCO
Audio Filter Setting
Audio Low Band
Audio High Band
Audio SAP VCO
PIP Comb D/A Level
PIP Contrast
PIP CVBS Coarse Tint
PIP CVBS Fine Tint
PIP CVBS Saturation
PIP S-Video Coarse Tint
PIP S-Video Fine Tint
PIP S-Video Saturation
PIP Brightness
PIP BP Clamp Adjustment
Align Gemstar Horizontal
Align Gemstar Vertical
Service H Gemstar Pip
Service V Gemstar Pip
Service Gemstar Pip Size
V_EHT
H_EHT
SVM_Ph
?
?
?
0 - 63
1
0 - 31
0 - 31
0 - 31
0 - 127
0 - 127
0 - 15
0 - 33
0 - 33
0 - 33
0 - 31
0-7
0 - 127
0 - 63
0 - 15
0 - 15
0 - 31
0 - 63
0 - 63
0 - 31
0 - 31
0 - 31
0 - 63
0 - 63
0 - 63
0 - 63
0 - 63
0 - 63
0 - 127
0 - 127
0-7
0 - 255
0 - 127
0-7
0 - 255
0 - 127
0 - 31
!247!
73-185
10-160
5-80
20-100
0 - 13
0-7
0-7
0-1
First Error Code
Second Error Code
Last Error Code
This data is for reading only
Activates PIP Window
Do not change this default data (247)
NOTE: Before making any adjustments using the Service Mode Screen record the current values for all parameters so that the
instrument can be returned to its current status.
Page 3-2
ATC113
ATC113
Error Codes
If certain failures occur in the chassis, error codes will be
stored in the chassis EEPROM. These error codes are displayed in parameters 1, 2 and 3. Parameter 1 stores
the error code for the first failure experienced by the instrument. Similarly, parameter 2 stores the error code for the
second failure. Parameter 3 is automatically updated to
display the error code for the most recent failure experienced
by the instrument. Error codes are summarized in Table 2.
no failures have occurred since the last time the error code
parameters were reset.
NOTE: The error codes should be reset to 0 after servicing using the VOL + and VOL - buttons.
Because a failure of a bus IC is a possible reason for needing
service, normal acknowledgment checking is disabled in the
service mode. If an IIC device has failed, its address will be
stored in the error code area.
D evice
00
03
08
09
0A
0B
10
0
3
8
9
10
11
16
D etected by m icro
T 4-Chip
T 4-Chip
F2PIP
Stereo D ecoder
D etected by m icro
12
18
D etected by m icro
2C
B0
B4
90
C4
C6
44
176
180
144
196
198
Condition
F2PIP
Stereo D ecoder
T hree Line Comb Filter
V ideo M atrix Switch
M ain T uner
M ain T uner
N o error code throw n
12V R un fault
X R P event detected
Pow er on reset
Pow er on reset
Pow er on reset
R un I2C clock or data clam ped at logic state
zero
Standby I2C clock or data clamped at logic
state zero
N o acknow ledge from device
PLL bus fault
D A C bus fault
Test Point:
Adjust:
1.
4.
Service mode can be exited at any time by pressing the
POWER button. New data is stored in the EEPROM when
you exit.
X-Ray Shutdown Check
The following procedure should be performed prior to, and
upon completion of service:
1. Momentarily apply a short between the shutdown test
point (BL901- located at back edge of chassis near main
tuner) and chassis ground (main tuner shield). The instrument must shutdown immediately, then turn back on
after ~ 2 seconds.
2. Apply and maintain a short between the shutdown test
point and chassis ground (tuner shield). The instrument
must shutdown immediately and remain shutdown (the
instrument will attempt to restart several times, then remain off).
3. Remove the short from BL901.
4. Enter the Service Mode and reset the error code
parameter(s) to 0.
CHASSIS ALIGNMENT
The ATC113 chassis requires the use of ChipperCheck®, a
TV/PC interface box, and a suitable computer for the majority of the alignments. A 486DX/33MHz PC with 8Meg of
memory is recommended. Basic geometry and color temperature adjustments are the only alignments accessible
through the front panel. These adjustments are included in
this service manual as front panel procedures but can also be
performed using ChipperCheck®.
ChipperCheck® software and the TV/PC interface box are
available from Sencore Electronics @:
http://www.sencore.com/
or
Tel. 1-800-SENCORE
(1-800-736-2673)
Instructions for the operation of ChipperCheck® software and
connection of the TV/PC interface are included as contextsensitive help files in the ChipperCheck® software.
Range: 0 - 63
5.
Connect a signal generator with a Color Bar pattern to
the instruments Main Tuner RF input and adjust the generator for a 1mVrms signal at 193.25MHz (CH10).
Put the instrument into Service Mode.
Connect a digital voltmeter to Pin#1 of the Main Tuner
(NH01).
Adjust Main RF_AGC (parameter#04 ) starting from
step 63. Normally at step 63 the voltmeter should read
approximately 4.1V. Using the volume down button
decrease the parameter value until the voltage is less
than 3.9V. Increase the value by one (1) for the correct
setup.
Horizontal Phase Adjustment
Test Point:
Adjust:
1.
3.
4.
5.
Observe Display
Parameter #15
Parameter #21
Range: 0 - 31
Range: 0 31
Using a signal generator tune the instrument to receive a
crosshatch pattern .
Adjust the instrument for 50% brightness, contrast and
color saturation.
Adjust the Horizontal Position (parameter #15) until the
center of the pattern is an equal distance from the left
and right edges of the display. (Note: with a crosshatch
pattern the partial blocks on the left and right edges of
the screen should be equal.)
If the picture tube is 31" or greater, Adjust Horizontal
Size (parameter #21 ) so that 5% of the crosshatch pattern is hidden at both the left and right edges of the display. (10% over scan +/- 2.65%). The width is not adjustable for smaller screen sizes.
EXAMPLE: If the crosshatch display has sixteen blocks
horizontally, adjust so that approximately 3/4 of a block
is hidden at both the right and left sides of the display
(0.75/16 = 4.6%).
6. If necessary repeat steps 1 to 5 to obtain an optimum
picture.
Vertical Adjustments
Test Point:
Adjust:
1.
2.
Page 3-3
Pin #1 Tuner NH01
Parameter #04
ATC113 Geometry Alignment
2.
Exiting Service Mode
3.
4.
AGC Alignment Main Tuner
2.
3.
The presence of a 0 in the error code values indicates that
Error code:
(H ex) (D ec)
ATC113 Tuner Alignment
Observe Display
Parameter #16
Parameter #17
Parameter #18
Parameter #19
Range: 0 - 7
Range: 0 - 127
Range: 0 - 63
Range: 0 - 15
color saturation.
Adjust Vertical Phase ( course vertical centering, parameter #16 ) to center the display as close as possible,
using the center of the crosshatch as a reference.
Adjust Vertical Centering (fine centering adjustment, parameter #18 ) to center the display, using the center of
the crosshatch as a reference.
NOTE: There is a center indentation on the sides of most
tubes in the shadow mask that can be used for centering.
6. Adjust Vertical Size (parameter #17) so that the entire
crosshatch pattern is visible on the screen.
7. Adjust VS Correction ( parameter #20 ) so that boxes at
the top and bottom of the screen are equal in size to the
boxes in the center of the pattern.
8. Adjust Vertical Linearity ( parameter #19 ) so that the
boxes at the top and bottom of the crosshatch pattern
are an equal distance from the top and bottom of the
screen.
9. Adjust Vertical Size (parameter #17) so that approximately 3.75% of the crosshatch pattern is hidden at both
the top and bottom of the display (7.5% over scan +/2.5%)
EXAMPLE: If the crosshatch display has 12 blocks vertically, adjust so that ~ 1/2 block is hidden at both the top
and bottom of the display (0.5/12 = 4.1%).
10. If necessary repeat steps 5 to 9 to obtain an optimum
picture.
Pin Cushion Adjustments.
(Used for 27TF/27VHP/32/36V instruments only)
Test Point:
Observe Display
Adjust:
Parameter #22
Range: 0 - 63
Parameter #23
Range: 0 - 63
Parameter #24
Range: 0 - 31
Parameter #25
Range: 0 - 31
1.
2.
3.
4.
5.
6.
7.
8.
Tune the instrument to receive a crosshatch pattern.
Page 3-4
Tune the instrument to receive a crosshatch signal.
color saturation.
Preset EW Parabola Correction (parameter #22) and EW
Trapezium Correction (parameter #23) to the mid-range
(value 32).
Adjust EW Correction Top (parameter #24) so that the
vertical lines in the top left and right corners of the display are straight.
Adjust EW Correction Bottom (parameter #25) so that
the vertical lines in the bottom left and right corners of
the display are straight .
Adjust the EW Parabola Correction (parameter #22) so
that the vertical crosshatch lines on the left and right
edges of the display are straight. Repeat steps 5 & 6 if
necessary produce a straight vertical line.
Adjust the EW Trapezium Correction (parameter #23)
so that the vertical lines at the edge of the pattern are
straight and parallel to the sides of the tube mask.
ATC113
9.
ATC113
Repeat steps 4-8 until vertical lines are straight over the
entire screen.
S-Correction and High Voltage Sensitivity Settings
Test Point:
Adjust:
1.
2.
Parameter #20
Parameter #48
Parameter #49
Range: 0 - 15
Range: 0 - 7
Range: 0 - 7
Use the table below to set Parameter (P) to the indicated
Value (V) for S-correction (parameters #20), Vertical
EHT sensitivity (parameter #48) and Horizontal EHT
sensitivity (parameter #49) for the different tube types.
Tube size
20 TF Orion
27 1R RCA
27 VHP RCA
32/36VHP RCA
27 TF Samsung
32TF RCA
32 TF Toshiba
36TF RCA
P
20
20
20
20
20
20
20
20
V
10
10
10
10
12
12
12
12
P
48
48
48
48
48
48
48
48
V
7
7
2
7
2
2
5
2
P
49
49
49
49
49
49
49
49
Screen Adjustment
2.
Test Point:
Adjust:
R,G,B pins on CRT
Screen Control
Pins 6,8,11
Main PCB
Check:
Parameter #5
Range: 3
1.
2.
3.
Apply a black level test signal to the instrument.
With an oscilloscope measure the R, G and B pins on the
CRT Socket and leave the scope lead on the pin with the
highest voltage.
V
2
2
2
2
2
2
5
2
1.
2.
1.
2.
Apply a gray scale pattern to the instruments RF input.
Set Brightness, Saturation, Tint at 50% and Contrast at
70%. Or Access the customer control Main Menu. Select Picture Quality. Select Picture Presets and then
select Normal Lighting. This resets the customer controls.
Adjust the Sub Brightness (parameter 12) so the first
bar on the gray scale bar is black and that each of the
gray scale bars are clearly distinguishable from each
other.
Test Point:
Adjust:
1.
Figure 3.
4.
Pin #11
Range: 0 - 127
Apply a 100IRE white luma signal to BY07 (SVID input)
With an oscilloscope measure and record the peak - peak
level at the Blue Cathode (pin 11) on the CRT.
5.
6.
6.
Adjust the cutoff pulse to 140V +/-3V using the
SCREEN potentiometer located on the Focus Block on
the back of the IHVT.
Check that AKB OK status (parameter 5) is equal to 3.
Focus Adjustment
Test Point:
Adjust:
1.
2.
3.
Observe Display
Focus Control
Main PCB
Tune the instrument to receive a crosshatch signal.
Access the customer control Main Menu. Select Picture Quality. Select Picture Presets or press Reset
on the remote control. Select Preset Normal Lighting.
This resets the customer controls.
Adjust the Focus control potentiometer located on the
Focus Block on the IHVT for a sharp display.
. tekcoS
Tint and Color Preset Adjustment
Test Point:
Adjust:
Figure 1.
3.
4.
5.
6.
Using the analyzers first test probe to read low light
signal, adjust the sub-brightness (parameter 12), until
Y reads 1 ± 0.5 nits.
Alternate Method:
Test Point:
Blue CRT
Pin #11
Adjust:
Parameter #12
Range: 0 - 33
Peak White Adjustment
Comb D/A Level Adjustment (PIP Models Only)
CRT
Parameter #33
4.
5.
5
3.
4.
Figure 2.
Test Point:
Adjust:
3.
Access the customer control Main Menu. Select Picture Quality. Select Picture Presets and then select
Normal Lighting. This resets the customer controls.
Monitor the Blue cathode on Pin 11 of the CRT with an
oscilloscope.
Preset the Sub Color (parameter#13 ) and Sub Tint (parameter#14 ) to a mid-range value of 16.
Remove the S-VID connector from BY07.
Apply the same signal to BY04 Video Input 1.
Adjust the PIP Comb D/A Level (parameter #33) for the
same peak - peak level as measured in step 2 +/-2%.
Blue CRT
Parameter #13
Parameter #14
Pin #11
Range: 0 - 33
Range: 0 - 33
NOTE: Allow the instrument to warm up for at least 15
minutes before doing the Tint and Color Preset Adjustments. This compensates for color drift in the IC as it
warms to run temperature.
1. Apply a color bar signal to the instrument.
Page 3-5
Adjust the Sub Tint ( parameter#14 ) so that the levels of
the cyan and magenta bars are equal.
7. Adjust the Sub Color (parameter#13) and set the amplitude of the blue bar as close to the level of the white bar
as possible.
8. Repeat step 6 and 7 until both conditions are met.
9. Exit the service Mode Menu.
10. Apply the same color bar signal to Video 1 Input (BY04)
and select Video 1 input.
11. Put the instrument into Service Mode.
12. Adjust the Sub Tint ( parameter#14 ) so that the levels of
the cyan and magenta bars are equal.
2.
3.
4.
5.
Brightness Preset Adjustment
Test Point:
Adjust:
Display
Parameter #12
Range: 0 - 15
Apply a 2 % Peak white pattern to the instruments RF
Input.
Attached TV color analyzer sensor onto the center of
the Peak white pattern.
Using the second test probe to read highlight signal, adjust the peak white reading so the luminance Y, stays on
the limits below. Use TV Service Menu Sub Contrast
(parameter 11) to achieve a peak white reading of:
490 nits ± 5 % for 20 inch XF
255 nits ± 5 % for 27 inch VHP, 1R
250 nits ± 5 % for 32 inch
170 nits ± 5 % for 36 inch
Range: 0 - 33
minutes before doing the Tint and Color Preset Adjustments. This compensates for color drift in the IC as it
warms to run temperature.
1. Apply a signal pattern to the RF input with a low light
area with 13 IRE.
2. Set Brightness, Saturation, Tint at 50% and Contrast at
3. Attached TV color analyzer sensor onto the center of the
Peak white pattern.
Display
Parameter #11
@70% contrast
@70% contrast
@70% contrast
@70% contrast
@70% contrast
@70% contrast
6 Switch off the menu to check the peak white alignment.
Make fine adjustment where necessary.
Alternate Method:
Test Point:
R,G,B pins on CRT
Pins 6,8,11
Adjust:
Parameter #11
Range: 0 - 15
1.
2.
Page 3-6
Apply a gray scale pattern to the instruments RF input.
ATC113
3.
4.
5.
6.
ATC113
Set the Sub Contrast (parameter 11) to mid-range 8.
With an oscilloscope measure the peak - peak voltage on
the R, G and B pins on the CRT Socket and leave the
scope lead on the pin with the highest peak - peak.
Adjust the Sub Contrast (parameter 11) so that the voltage between blanking and white level is:
32 Tube - 109V
32 inch tube waveform
Color Temperature Adjustment
Display Areas
Parameter #06
Parameter #07
Parameter #08
Parameter #09
Parameter #10
Using the high light part of the image and the second
test probe, adjust RG drive gain (service parameter 09)
and Blue drive gain (service parameter 10) for:
x = 285 ± 5 (for RF/AV/ Component input)
y = 294 ± 5 (for RF/AV/ Component input)
6.
Repeat steps 4 and 5 until the color coordinates can be
achieved in both low and high light intensity.
7. Switch off the service menu and check the color alignment. Make fine adjustment where necessary
8. Make fine geometry adjustment where necessary, following the procedure described in Geometry Alignment section.
Component Video Adjustment:
9. Apply the low light high light pattern to the Component
Video input (BY06) and repeat steps 3 to 8.
Alternate Method:
Test Point:
Observe Display
Adjust:
Parameter #06
Range: 0 - 31
Parameter #07
Range: 0 - 31
Parameter #08
Range: 0 - 31
Parameter #09
Range: 0 - 127
Parameter #10
Range: 0 - 127
minutes before doing the Color Temperature Adjustments.
This compensates for color drift in the IC as it warms to
run temperature.
1. Tune the instrument to receive a gray scale stairstep signal.
Figure 4.
Test Point:
Adjust:
5.
Range: 0 - 31
Range: 0 - 31
Range: 0 - 31
Range: 0 - 127
Range: 0 - 127
minutes before doing the Color Temperature Adjustments.
This compensates for color drift in the IC as it warms to
run temperature.
1. Apply a pattern to the RF input that contains both a low
light area (27 IRE) and high light area (75 IRE).
2. Attached a TV color analyzer sensor onto the center of
the low light area.
4. Using the low light part of the image and the first test
probe, adjust Red cutoff (service parameter 06),
Green cutoff (service parameter 07) and Blue cutoff (service parameter 08) level for:
x = 285 ± 7 (for RF/AV input)
x = 285 ± 10 (for Component input)
y = 294 ± 7 (for RF/AV input)
y = 294 ± 10 (for Component input)
NOTE: Some generators produce a gray scale stairstep by
using the color bars signal with the color burst turned
off. This produces 8 bars that step from Black (7.5IRE)
to White (77IRE).
2. Access the customer control Main Menu. Select item #2
Picture Quality. Select item#2 Picture Presets and
then select item#2 Normal Lighting. This resets the
customer controls.
3. If not previously adjusted perform the Screen Adjustment procedure.
5. Adjust RG Drive Gain (parameter#09 ) to 42 and adjust
Blue Drive Gain (parameter#10 ) to 42.
6. Adjust Red cutoff (parameter#06) value to 10.
7. Adjust Green cutoff (parameter#07) and Blue cutoff
(parameter#08) to produce the best gray tones in the first
few steps of the gray scale. The Red cutoff (parameter#06) value may be adjusted to produce the best picture quality.
8. Adjust Green Gain (parameter#09) and Blue Gain (parameter#10) for best white level on the last steps of the
gray scale.
9. The biases and drives are interactive; you must check
the low light to high light gray scale tracking (black and
white picture). Should any color other than gray or white
be dominant in low light to high light areas the color
Page 3-7
the PIP luma bar (black to white) is the same as the main
picture luma bar ±2%.
temperature settings have not been properly set. Repeat
steps 7 and 8 until no adjustments are necessary.
NOTE: Color cutoff adjustments affect the low light (dark)
areas while color drive adjustments affect the high light
(white) areas.
10. Adjusting biases and drives may effect the overall brightness. And, adjusting the screen control may effect the
color temperature. If the screen control is adjusted after
the color temperature alignment is complete; the color
temperature should be checked again to insure that adjusting the screen control has not effected it.
11. Tune the instrument to a live RF channel and adjust
brightness for best looking picture in normal room lighting.
PIP Alignments (PIP Models Only)
PIP Contrast & Brightness
Test Point:
Adjust:
1.
2.
3.
4.
5.
CRT
Parameter #34
Parameter #41
Pin 11
Range: 0 - 127
Range: 0 - 31
Apply a composite video signal with 100IRE luma bar
to Video 1 at BY04.
Select Video 1 as the main picture.
Turn on PIP and select Video 1 as the PIP picture.
Connect an oscilloscope to the Blue Cathode on the CRT
Pin 11.
PIP Tint & Saturation Alignments (Composite)
Test Point:
Adjust:
CRT
Parameter #35
Parameter #36
Parameter#37
Pin 11
Range: 0 - 7
Range: 0-255
Range: 0-127
1.
Access the customer control Main Menu. Select item
Picture Quality. Select Auto Color and then select
Off. This turns Auto Color to OFF.
2. Apply a Color bar signal to Video 1 Input (BY04).
3. Select Video 1 as the main picture source.
4. Turn on PIP and select Video 1 as the PIP picture.
6. Connect an oscilloscope to the Blue Cathode on the CRT
Pin 11.
7. Adjust PIP CVBS Fine tint (parameter#35) to mid-range
(128).
8. Adjust the PIP CVBS Coarse Tint (parameter#35) to set
the amplitudes of the PIP Cyan and Magenta bars to be
as close as possible to the main picture Cyan and Magenta bars.
9. Adjust PIP CVBS Saturation level (parameter#37) so
that the PIP blue bar is as close as possible to the amplitude of the main picture blue bar at the blue cathode.
10. Fine tune the Cyan and Magenta levels by adjusting PIP
CVBS Fine tint (parameter#35) so that the amplitudes
of the PIP Cyan and Magenta bars are as close as possible to the same level as the main picture Cyan and
Magenta bars.
Figure 5.
6.
7.
Adjust the PIP Brightness level (parameter #41) such
that the black level of the PIP is in line with the black
level of the main picture at the blue cathode - ±2%.
Adjust the PIP Contrast level (parameter 34) such that
Figure 6.
11. Because of the interaction of the Saturation adjustment
to the Fine Tint alignment it may be necessary to repeat
steps 7 through 10 until the PIP is correctly adjusted.
Page 3-8
ATC113
ATC113
PIP Tint & Saturation Alignments (SVideo)
Test Point:
Adjust:
CRT
Parameter #38
Parameter #39
Parameter #40
up the Gemstar Diagnostic Screen shown below. Adjust
the horizontal centering of the Gemstar display so that
the distance from the edge of the color bars to the edge
of the tube is the same on both the left and right sides of
the display.
Pin 11
Range: 0 - 7
Range: 0-255
Range: 0-127
1.
Access the customer control Main Menu. Select item
Picture Quality. Select Auto Color and then select
Off. This turns Auto Color to OFF.
2. Apply a Color bar signal to S-Video Input (BY07).
3. Select Video 1 as the main picture source.
4. Turn on PIP and select Video 1 as the PIP picture.
6. Connect an oscilloscope to the Blue Cathode on the CRT
Pin 11.
7. Adjust PIP S-Video Fine tint (parameter#39) to mid-range
(128).
8. Adjust the PIP S-Video Coarse Tint (parameter#38) to
set the amplitudes of the PIP Cyan and Magenta bars to
be as close as possible to the main picture Cyan and Magenta bars.
9. Adjust PIP S-Video Saturation level (parameter#40) so
that the PIP blue bar is as close as possible to the amplitude of the main picture blue bar at the blue cathode.
10. Fine tune the Cyan and Magenta levels by adjusting PIP
S-Video Fine tint (parameter#39) so that the amplitudes
of the PIP Cyan and Magenta bars are as close as possible to the same level as the main picture Cyan and Magenta bars.
11. Because of the interaction of the Saturation adjustment
to the Fine Tint alignment it may be necessary to repeat
steps 7 through 10 until the PIP is correctly adjusted.
Gemstar Positioning
Test Point:
Adjust:
Observe Display
Parameter #43
Parameter #44
Parameter #45
Parameter #46
Parameter #47
Range: 73 - 185
Range: 10 - 160
Range: 5 - 80
Range: 20 - 100
Range: 0 13
NOTE: The OSD for Gemstar is not intended to need any
alignment. This alignment should only be performed if
the Gemstar module is repaired or replaced.
1. Apply a Color Bar pattern to the RF Input.
2. Turn on PIP and select the Color Bars as the Main and
PIP picture.
4. Go to parameters #43, #44, #45, #46, and #47 and record
their values before proceeding. This will allow you to
reset the alignments to known values in case one is adjusted by mistake.
5. Go to parameter #43, Gemstar horizontal position. Adjust the value by one in either direction. This will bring
Gemstar Diagnostic Screen
Go to parameter #44, Gemstar vertical position. Adjust
the vertical centering of the Gemstar display so that the
distance from the upper edge of the PIP to the top edge
of the tube is the same distance as the distance from the
bottom of the blue bar to the bottom edge of the display.
7. Go to parameter #46, PIP window vertical size. Adjust
the value either up or down. This will bring up the
Gemstar diagnostic screen shown below. Adjust the PIP
window so that the bottom of the PIP window is approximately even with the bottom of the Version line of text.
The larger the value the larger the PIP window.
8. Go to parameter #45, vertical PIP position, and adjust
the value. The screen will revert to the Gemstar Diagnostic Screen shown on the previous page. There is a
gray border around the PIP display. Adjust the value
with the volume down button until the lower gray border
of the PIP display is completely visible and the main picture can be seen below it. Record this value.
9. Adjust the value of the PIP vertical position with the
volume up button until the entire upper gray border of
the PIP display can be seen and the main picture can be
seen above it. Record this value. If the difference in
values is 1 or 0 go to step 6 and reduce the size of the PIP
window (increase the gap). If the difference is greater
than 1, adjust the value to the average of the two recorded
values.
10. Go to parameter #45, horizontal PIP position, and adjust
the value with the volume up button until the entire left
gray border of the PIP display can be seen and the main
picture can be seen on the left of it . Record this value.
11. Adjust the value of the PIP horizontal position with the
volume down button until the entire right gray border of
the PIP display can be seen and the main picture to the
right of it. Record this value. Adjust the value to the
average of the two recorded values.
6.
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ATC113 ATC113 Page 3-2 Page 3-1 ALIGNMENT

Transcription

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