Orion T2915 TV Service menu

ORION T2915 TV Service menu mode

ORION TV CHASSIS 11AK33

How to enter the Orion TV Service Menu mode:
Enter the Main Menu
•Press number 4, 7, 2, and 5, respectively
Press channel up/down to select parameter.
Press volume down/up to change the data value.
•Press MENU key to exit.

Orion T2915 •WHITE BALANCE ADJUSTMENT:
The following three parameters are used to make white balance adjustment. To do this, use a Colour Analyser.
Using white point RED, white point GREEN and white point BLUE parameters, insert the + sign in the square
which is in the middle of the screen.
ADJUST 00 = White Point RED
ADJUST 01 = White Point GREEN
ADJUST 02 = White Point BLUE

Orion T2915 AGC ADJUSTMENT:
In order to do AGC adjustment, enter a 60dBmV RF signal level from channel C-12.
Connect a digital voltmeter to pin 1 of the tuner. Change the AGC parameter until you see 3.70VDC on voltmeter display. Check that picture is normal at 90dBmV signal level.
ADJUST 03 = AGC
IF-PLL NEGATIVE ADJUSTMENT (Only with PLL tuner):
Connect 38.9 MHz test pattern for PAL B/G, PAL-SECAM B/G, 39.5 MHz test pattern for PAL I or 45.75 MHz test pattern for PAL M/N, NTSC M model to Z401 SAW filter input terminals. Change the IF-PLL Negative parameter until you see IN, DOWN below. If you cannot catch IN, DOWN position this way, using a screwdriver rotate the VIF-COIL LT401 left or right until you
see IN, DOWN. ADJUST 04 = IF-PLL Negative
IF-PLL POSITIVE ADJUSTMENT (Only with PLL tuner):
Connect 33.9 MHz test pattern for SECAM L’ model to Z401 SAW filter input terminals. Change the IF-PLL
Positive parameter until you see IN, DOWN below. If you cannot catch IN, DOWN position this way, using a screwdriver rotate the VIF-COIL LT401
left or right until you see IN, DOWN. ADJUST 05 = IF-PLL Positive
LUMINANCE DELAY ADJUSTMENT (with only TDA 8844 video processor):
ADJUST 06 = Y-Delay PAL


Service menu Orion T2915 TV

Orion T2915 TV Service menu

Photo credit : spyhollywood.com

Enter a PAL B/G colour a
nd black-white bar test pattern via RF. Adjust Y-Delay PAL till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible.
Note: If the SAW filter is one of the G1965M, J1951M, J3950M, K2958M, K2962M, G3957M, K6256K, K6259K or M1963M, there is constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS. This means the adjustment must be set to the maximum value.
ADJUST 07 = Y-Delay SECAM
Enter a SECAM B/G colour and black-white bar test pattern via RF. Adjust Y-Delay SECAM till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible.
Note: If the SAW filter is one of the G1965M, K2958M, K2962M, G3957M, K6256K or K6259K, there is constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS.
This means the adjustment must be set to the maximum value.
ADJUST 08 = Y-Delay NTSC
Enter an NTSC colour and black-white bar test pattern via RF. Adjust Y-Delay NTSC till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible.
Note: If the SAW filter is M1963M, there is constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS. This means the adjustment must be set to the maximum value.
ADJUST 09 = Y-Delay Other In case of other colour systems, enter this system with colour and black-white bar test pattern via RF. Adjust YDelay
Other till the colour transients on the colour bar of the pattern become as sharper and colours between
transients do not mix with each other as possible. Normally for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS.
This means the adjustment must be set to the maximum value.
Orion T2915 VERTICAL ZOOM ADJUSTMENT (only for 110ø picture tubes):
ADJUST 10 = Vertical Zoom
Enter a PAL B/G circle test pattern via RF. Change vertical zoom till you see the upper and lower limit of the circle as close to the upper and lower limit of the picture tube as possible.
VERTICAL SCROLL ADJUSTMENT (only for 110ø picture tubes):
ADJUST 11 = Vertical Scroll
Enter a PAL B/G circle test pattern via RF. Change vertical scroll till you see the circle exactly in the middle of the screen.
Orion T2915 HORIZONTAL SHIFT ADJUSTMENT:
ADJUST 12 = 4 : 3 Horizontal Shift
Enter a RED PURITY test pattern via RF. Change horizontal shift till the picture is horizontally centred. Check whether this adjustment is correct after completing Service Mode Adjustment.
Orion T2915 VERTICAL SLOPE ADJUSTMENT:
ADJUST 13 = 4 : 3 Vertical Slope Enter a CROSS-HATCH B/G test pattern via RF. Change vertical slope till the size of squares on both the upper and lower part of test pattern become equal to the squares laying on the vertical centre of the test pattern. Check and readjust VERTICAL
SLOPE item if the adjustment becomes improper after some other geometric adjustments are done.
VERTICAL AMPLITUDE ADJUSTMENT:
ADJUST 14 = 4 : 3 Vertical Amplitude
Enter a PAL B/G test pattern via RF. Change vertical slope till horizontal black lines on both the upper and lower part of the test pattern become very close to the upper and lower horizontal sides of picture tube and nearly about to disappear. Check and readjust VERTICAL AMPLITUDE item if the adjustment becomes improper after some other geometric adjustments are done.
S-CORRECTION ADJUSTMENT:
ADJUST 15 = 4 : 3 S-Correction
Enter a PAL B/G circle test pattern via RF. Change S-correction till the middle part of the circle is as round as possible.
Orion T2915 VERTICAL SHIFT ADJUSTMENT:
ADJUST 16 = 4 : 3 Vertical Shift
Enter a PAL B/G test pattern via RF. Change Vertical Shift till the test pattern is vertically centred, i.e. horizontal line at the centre pattern is in equal distance both to upper and lower side of the picture tube. Check and readjust
Vertical Shift item if the adjustment becomes improper after some other geometric adjustments are done.
EW WIDTH ADJUSTMENT (only for 110ø picture tubes):
ADJUST 17 = 4 : 3 EW Width
Enter a PAL B/G test pattern via RF. Change EW Width till the vertical black and white bars on both left and right side of the pattern exactly disappear.
EW PARABOLA WIDTH ADJUSTMENT (only for 110ø picture tubes):
ADJUST 18 = 4 : 3 EW Parabola Width
Enter a PAL B/G test pattern via RF. Change EW Parabola Width till vertical lines close to the both sides of the picture frame become parallel to vertical sides of picture tube. Check and readjust EW Parabola Width item if the adjustment becomes improper after some other geometric adjustments are done.
EW UPPER CORNER PARABOLA ADJUSTMENT (only for 110ø picture tubes):
ADJUST 19 = 4 : 3 EW Corner Parabola
Enter a PAL B/G test pattern via RF. Change EW Upper Corner Parabola till vertical lines at the corners of both sides of picture frame become vertical and parallel to vertical corner sides of picture tube. Check and readjust EW
Upper Corner Parabola item if the adjustment becomes improper after some other geometric adjustments are done.
EW TRAPEZIUM ADJUSTMENT :
ADJUST 20 = 4 : 3 EW Trapezium
Enter a PAL B/G test pattern via RF. Change EW Trapezium till vertical lines, especially lines at the sides of the picture frame became parallel to the both sides of picture tube as close as possible. Check and readjust EW
Trapezium item if the adjustment becomes improper after some other geometric adjustments are done.
HORIZONTAL PARALLELOGRAM:
ADJUST 21 = Horizontal Parallelogram
Enter a PAL B/G test pattern via RF. Change Horizontal Parallelogram to set vertical lines orthogonal to the horizontal lines Check and readjust Horizontal Parallelogram item if the adjustment becomes improper after some other geometric adjustments are done.
BOW :
ADJUST 22 = Bow
Enter a PAL B/G test pattern via RF. Change Bow to straighten the vertical lines. Check and readjust Bow item if the adjustment becomes improper after some other geometric adjustments are done.
EW LOWER CORNER PARABOLA ADJUSTMENT (only for 110ø picture tubes):
ADJUST 23 = 4 : 3 EW Lower Corner Parabola
Enter a PAL B/G test pattern via RF. Change EW Lower Corner Parabola till vertical lines at the corners of both sides of picture frame become vertical and parallel to vertical corner sides of picture tube. Check and readjust EW
Lower Corner Parabola item if the adjustment becomes improper after some other geometric adjustments are done.