ORION T1420MJ TV Service menu

ORION T1420MJ TV Service menu mode

ORION TV CHASSIS 11AK20S

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.

•There two selections in the Service Menu: ‘ADJUST...’ and ‘OPTIONS.
How to use the ADJUST Menu:
• Enter the Service Menu,
• Move the selection bar on the item ‘ADJUST...’ using the “P” or “P” keys,
• Select the item ‘ADJUST...’ using the “ ” or “ ” keys,
• The items below will be displayed (one of them at one time),
1) AGC (Automatic Gain Control) 8) HSH (Horizontal Shift)
2) VA1 (Vertical Amplitude for 4:3, 50Hz) 9) WG (White Point GREEN)
3) VA2 (Vertical Amplitude for 16:9, 50Hz) 10) WR (White Point RED)
4) VA3 (Vertical Amplitude for 4:3, 60Hz) 11) WB (White Point BLUE)
5) VA4 (Vertical Amplitude for 16:9, 60Hz) 12) CR (Cut-off Red)
6) VSH (Vertical Shift) 13) CG (Cut-off Green)
7) VL (Vertical Linearity) 14) OSH (OSD Horizontal Position)
• Press “P” or “P” keys till the desired item is displayed,
• Press “ ” or “ ” keys to change the values.
NOTE: The Service Menu below shows the ranges of the adjustment parameters.

ORION T1420MJ AGC Adjustment:
•Enter a 60dBmV RF signal level from channel C-12, • Connect a digital voltmeter to AGC test point (or to pin1 of the tuner), • Set the AGC parameter to zero and note the AGC voltage value, • Increase the AGC parameter till the AGC voltage decreases 1V below the noted voltage value, • Check that picture is normal at 90dBmV signal level.

ORION T1420MJ Vertical Amplitude Adjustments:
There’re four adjustment parameters: Two for 50Hz and two for 60Hz.
•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 disappears, Check and do the same adjustment if it becomes improper after some other geometric adjustments.
Vertical Shift and Horizontal Shift Adjustments:
•Enter a test pattern for geometric adjustments via RF,
•Change Vertical Shift till the test pattern is centred vertically and horizontally. • Check and do the same adjustment if it becomes improper after some other geometric adjustments.
Vertical Linearity Adjustment:
•Enter a cross-hatch pattern via RF, • Change VL paramaeter 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 do the same adjustment if it becomes improper after some other geometric adjustments.
ORION T1420MJ White Point Adjustment:
•Enter a white pattern via RF,
•Set all of the 3 parameters (WR, WG, WB) firstly to zero,
•Set the values till you get a pure white screen. (To to do a correct adjustment use a colour analyser).
Black point Adjustment:
•Set CR and CG parameter values firstly to zero, • Set the values to do this adjustment.

How to use the OPTION BYTEs:
•Enter the Service Menu,
•Move the selection bar on the item ‘OPTIONS...’ using the “P” or “P” keys, • Select the item ‘OPTIONS...’ using the “ ” or “ ” keys,• Select the desired option, Use the digit keys to do the adjustments. The digit keys 0 through 7 are used to change the bits 0 through 7, respectively.

ORION T1420MJ TV Service menu

Photo credit : meddiodesign.com

AFC Adjustment of ORION T1420MJ:
For TVs not including ‘ L/L’ ’ Standarts:
• Switched the system to the desired standard,
• Apply the IF signal to the IF inputs in accordance with the standards (38.9MHz for ‘ B/G ’ and ‘ D/K ’,
39.5MHz for ‘ I ’ ) at pin1 and 2 of SAW filter (Z101)
• Adjust the VL101 until getting 2.5 Vdc at pin9 of the microcontroller (IC501).
For TVs including ‘ L/L’ ’ Standarts:
• Switched the system to a desired standard,
• Apply the IF signal to the IF inputs in accordance with the standards (38.9MHz for ‘ B/G ’ and ‘ D/K ’,
39.5MHz for ‘ I ’ ) at pin1 and 2 of SAW filter (Z101),
• Adjust the VL101 until getting 2.5 Vdc at pin9 of the microcontroller (IC501),
• Switched the system to the standard ‘ L ’,
• Apply the IF signal to the IF inputs in accordance with the standards (33.9MHz for ‘ L ’) at pin1 and 2 of
SAW filter (Z101),
• Adjust the VC101 until getting 2.5 Vdc at pin9 of the microcontroller (IC501).