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In order to enter service menu, first enter the main menu and then press the digits 4, 7, 2 and 5 respectively. To select adjust parameters, use Ù or Ú buttons. To change the selected parameter, use < or > buttons. Selected parameter will be highlighted. Entire service menu parameters of AK37 CHASSIS are listed below. For some of parameters the default values are given on the same table.
REGISTER PARAMETER OSD IF1 IF2 IF3 IF4 AGC VLIN VS1A VS1B VP1 HP1 VS2A VS2B VP2 HP2 RGBH VSOF VPOF HSOF HPOF HTOF WR WG WB BR BG APR FMP1 NIP1 SCP1 FMP2 NIP2 SCP2 S1V S2V F1H F1L F2H F2L BS1 BS2 BS3 CB OP1 OP2 OP3 OP4 OP5 TX1 GEOM OSD Horizontal Position IF Coarse Adjust IF Fine Adjust IF Coarse Adjust for L-Prime IF Fine Adjust for L-Prime Automatic Gain Control Vertical Linearity Vertical Size for 50 Hz / 4:3 (AK30) Vertical Size for 50 Hz / 16:9 (AK30) Vertical Position for 50 Hz (AK30) Horizontal Position for 50 Hz (AK30) Vertical Size for 60 Hz / 4:3 (AK30) Vertical Size for 60 Hz / 16:9 (AK30) Vertical Position for 60 Hz (AK30) Horizontal Position for 60 Hz (AK30) RGB Horizontal Shift Offset Vertical Size Offset for 60Hz (AK37) Vertical Position Offset for 60 Hz (AK37) Horizontal Size Offset for 60 Hz (AK37) Horizontal Position Offset for 60 Hz (AK37) Horizontal Trap Correction Offset for 60 Hz (AK37) White Point Adjust for RED White Point Adjust for GREEN White Point Adjust for BLUE Bias for RED Bias for GREEN APR Threshold FM Prescaler when AVL is OFF NICAM Prescaler when AVL is OFF SCART Prescaler when AVL is OFF FM Prescaler when AVL is ON NICAM Prescaler when AVL is ON SCART Prescaler when AVL is ON SCART1 Volume SCART2 Volume High Byte of crossover frequency for VHF1-VHF3 Low Byte of crossover frequency for VHF1-VHF3 High Byte of crossover frequency for VHF3-UHF Low Byte of crossover frequency for VHF3-UHF Band Switch Byte for VHF1 Meaningful for only Band Switch Byte for VHF3 Meaningful for only Band Switch Byte for UHF Meaningful for only Control Byte Meaningful for only PLL Tuner Option 1 (see the Option List) Option 2 (see the Option List) Option 3 (see the Option List) Option 4 (see the Option List) Option 5 (see the Option List) Teletext Option 1 (see the Option List) Geometry Option (see the Option List) (AK37) STEREO ONLY STEREO ONLY STEREO ONLY STEREO ONLY STEREO ONLY STEREO ONLY STEREO ONLY STEREO ONLY MEANINGFUL FOR ONLY PLL TUNER (see tuner setting table) MEANINGFUL FOR ONLY PLL TUNER (see tuner setting table) MEANINGFUL FOR ONLY PLL TUNER (see tuner setting table) MEANINGFUL FOR ONLY PLL TUNER (see tuner setting table) MEANINGFUL FOR ONLY PLL TUNER (see tuner setting table) MEANINGFUL FOR ONLY PLL TUNER (see tuner setting table) MEANINGFUL FOR ONLY PLL TUNER (see tuner setting table) MEANINGFUL FOR ONLY PLL TUNER (see tuner setting table) PERIPHERAL OPTIONS (see option table) RECEPTION STANDART OPTIONS (see option table) VIDEO OPTIONS (see option table) TV FEATURE OPTIONS (see option table) CHANNEL TABLE OPTIONS (see option table) TELETEXT OPTIONS (see option table) GEOMETRY OPTIONS (see option table) CVBS RGB HORIZONTAL POSITION COMPENSATION ADJUST AFTER SETTING ALL GEOMETRY VALUES IN 50 HZ ADJUST AFTER SETTING ALL GEOMETRY VALUES IN 50 HZ ADJUST AFTER SETTING ALL GEOMETRY VALUES IN 50 HZ ADJUST AFTER SETTING ALL GEOMETRY VALUES IN 50 HZ ADJUST AFTER SETTING ALL GEOMETRY VALUES IN 50 HZ ADJUST VERTICAL LINEARITY NOTE ADJUST HORIZONTAL POSITION FOR OSD

AK37 CHASSIS MANUAL ADJUSTMENT PROCEDURE

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In order to enter the geometry menu, press the green button on the remote control :
REGISTER VSIZ VPOS VSCO VCCO HSIZ HPOS HPCO HCCO HTCO VZSZ PARAMETER Vertical Size Vertical Position Vertical S Correction. Vertical C Correction. Horizontal Size Horizontal Position. Horizontal Pincushion Correction for Horizontal Corner Correction. Horizontal Trap Correction. Zoom Vertical Size. NOTE ADJUST VERTICAL SIZE (50 HZ) ADJUST VERTICAL POSITION (50 HZ) ADJUST VERTICAL S CORRECTION (50HZ) ADJUST VERTICAL C CORRECTION (50HZ) ADJUST HORIZANTAL SIZE (50 HZ) ADJUST HORIZANTAL POSITION (50 HZ) ADJUST HORIZANTAL PINCUSHION CORRECTION (50 HZ) ADJUST HORIZANTAL CORNER CORRECTION (50HZ) ADJUST HORIZANTAL TRAP CORRECTION (50HZ) ADJUST VERTICAL SIZE FOR ZOOM MODE (50HZ)

USING REMOTE CONTROL BUTTONS RED BUTTON (For Stereo models only): It switches the AVL to ON or OFF mode on service menu. AVL word is visible on service menu when AVL is on. GREEN BUTTON : It is used to enter the geometry menu. YELLOW BUTTON : It switches to VERTICAL SCAN DISABLE mode on service menu. It is usefull to adjust screen voltage. It is also used as Program Down button on geometry menu. BLUE BUTTON : It is used to adjust AGC and IF automatically on service menu.It is also used as Program Up button on geometry menu. TTX UPDATE BUTTON : It is used to change the picture mode on geometry menu. WHITE BALANCE ADJUSTMENT The following three parameters are used to make white balance adjustment. To do this, use a Colour Analyser. Using WR (White point adjust for RED), WG (White point adjust for GREEN), WB (White point adjust for BLUE) parameters, insert the + sign in the square which is in the middle of the screen. The suggested values for these parameters are given on the table above. AGC ADJUSTMENT In order to do AGC adjustment, enter a 60dBmV RF signal level from channel C-12 (224.25 MHz) Select AGC parameter from service menu. Press BLUE (INSTALL) button from remote controller. The adjustment will be done automatically by software. See the AGC indicator on service menu, it must be 1. Check that picture is normal at 90dBmV signal level.

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IF NEGATIVE ADJUSTMENT (WITHOUT L SYSTEMS) Set the video pattern to a PAL colour bar pattern with frequency 38.9 MHz. Apply this IF signal to PIN-10 and PIN-11 of tuner. Press PROG-1 and after that BLUE (INSTALL)button from remote controller. Select the standart as BG or I. (if BG is not available) Enter service menu. Select IF1 parameter from service menu and press BLUE (INSTALL) button from remote controller. IF adjustment will be done automatically by software. See the IF indicator on service menu, it must be like on FIGURE-1 shown above. IF POSITIVE ADJUSTMENT (WITH L SYSTEMS) Set the video pattern to a SECAM-L colour bar pattern with frequency 33.9 MHz. Apply this IF signal to PIN-10 and PIN-11 of tuner. Press PROG-1 and after that BLUE (INSTALL)button from remote controller. Select the BAND VHF-1 (S1 S4 for PLL tuners) and standard as L. Enter service menu. Select IF1 parameter from service menu and press BLUE (INSTALL) button from remote controller. IF adjustment will be done automatically by software. See the IF indicator on service menu, it must be like on FIGURE-1 shown above.

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OSD HORIZONTAL POSITION ADJUSTMENT Select OSD parameter on service menu. Adjust the horizontal position of OSD to the middle of screen, by using the reference bar on bottom of service menu. TELETEXT BRIGHTNESS ADJUSTMENT Set the TV set to a channel with Teletext. Enter service menu. Press TEXT button from remote controller. Adjust BRIGHTNESS parameter to value 39 by using left-right buttons from remote controller. Press TV button and MENU button from remote controller respectively. Adjustment is done. GEOMETRY ADJUSTMENTS First adjust all the 50 Hz geometry values defined in geometry menu for each picture mode. Then, enter service menu and adjust 60 Hz geometry values for each picture mode by using offset adjustment items.
Vertical Size for 50 Hz (VSIZ and VZSZ) Enter a PAL B/G circle test pattern via RF. Enter geometry menu and press TTX UPDATE button from remote controller to switch to any picture mode on geometry menu. Change VSIZ till the picture format becomes the required format. Check and readjust Vertical Size item if the adjustment becomes improper after some other geometric adjustments are done. Repeat this for every picture mode.Use VZSZ for proper vertical size adjustment in zoom,subtitle and cinema modes. Vertical Position for 50 Hz(VPOS) Enter a PAL B/G circle test pattern via RF. Enter geometry menu and press TTX UPDATE button from remote controller to switch to any picture mode on geometry menu. Change Vertical Position till the test pattern is vertically centred. Horizontal line at the centre pattern is in equal distance both to upper and lower side of the picture tube. Check and readjust Vertical Position item if the adjustment becomes improper after some other geometric adjustments are done. Repeat this for every picture mode. Horizontal Size for 50 Hz (HSIZ) Enter a PAL B/G circle test pattern via RF. Enter geometry menu and press TTX UPDATE button from remote controller to switch to any picture mode on geometry menu. Change HSIZ (Horizontal Size) till the picture format becomes the required format. Check and readjust Horizontal Size item if the adjustment becomes improper after some other geometric adjustments are done. Repeat this for every picture mode. Horizontal Position for 50 Hz (HPOS) Enter a PAL B/G circle test pattern via RF. Enter geometry menu and press TTX UPDATE button from remote controller to switch to any picture mode on geometry menu. Change Horizontal Position till the picture is horizontally centred. Check and readjust Horizontal Position item if the adjustment becomes improper after some other geometric adjustments are done. Repeat this for every picture mode. Horizontal Trap Correction for 50 Hz (HTCO) Enter a PAL B/G circle test pattern via RF. Enter geometry menu and press TTX UPDATE button from remote controller to switch to any picture mode on geometry menu. Change HTCO till the picture format becomes the required format. Repeat this for every picture mode. Vertical S Correction for 50 Hz (VSCO) Enter a PAL B/G circle test pattern via RF. Enter geometry menu and press TTX UPDATE button from remote controller to switch to any picture mode on geometry menu. Change VSCO till the picture format becomes the required format. Repeat this for every picture mode. Vertical C Correction for 50 Hz (VCCO) Enter a PAL B/G circle test pattern via RF. Enter geometry menu and press TTX UPDATE button from remote controller to switch to any picture mode on geometry menu. Change VCCO till the picture format becomes the required format. Repeat this for every picture mode. Horizontal Pincushion Correction for 50 Hz (HPCO) Enter a PAL B/G circle test pattern via RF. Enter geometry menu and press TTX UPDATE button from remote controller to switch to any picture mode on geometry menu. Change HPCO till the picture format becomes the required format. Repeat this for every picture mode. Horizontal Corner Correction for 50 Hz (HCCO) Enter a PAL B/G circle test pattern via RF. Enter geometry menu and press TTX UPDATE button from remote controller to switch to any picture mode on geometry menu. Change HCCO till the picture format becomes the required format. Repeat this for every picture mode. Vertical Size Offset for 60 Hz (VSOF) Enter a NTSC-M circle test pattern in any picture mode via RF. Enter service menu. By changing VSOF value adjust vertical size for 60Hz. Repeat this for every picture mode. Vertical Position Offset for 60 Hz (VPOF) Enter a NTSC-M circle test pattern in any picture mode via RF. Enter service menu. By changing VPOF value adjust vertical position for 60Hz. Repeat this for every picture mode. Horizontal Size Offset for 60 Hz (HSOF) Enter a NTSC-M circle test pattern in any picture mode via RF. Enter service menu. By changing HSOF value adjust horizontal size for 60Hz. Repeat this for every picture mode. Horizontal Position Offset for 60 Hz (HPOF) Enter a NTSC-M circle test pattern via RF. Enter service menu. By changing HPOF value adjust horizontal position for 60Hz. Repeat this for every picture mode. Horizontal Trap Correction Offset for 60 Hz (HTOF) Enter a NTSC-M circle test pattern via RF. Enter service menu. By changing HTOF value adjust horizontal trap correction for 60Hz. Repeat this for every picture mode. RGB MODE Horizontal Position (RGBH) Enter a RGB circle test pattern via video inputs. Force the TV to RGB mode by pressing AV button from remote controller. Change RGB Horizontal Position till the picture is horizontally centred. Check and readjust RGBH item if the adjustment becomes improper after some other geometric adjustments are done.

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50 Hz. 4:3 Geometry Adjustment for 4:3 Tube

50 Hz. 16:9 Geometry Adjustment for 4:3 Tube

50 Hz. 14:9 Geometry Adjustment for 16:9 Tube

OPTION SETTINGS Select concerned OPTION from service menu. To change a bit on selected option press the same number from remote controller. So this bit will be changed from 1 to 0 or from 0 to 1. If any option is selected on service menu you will see an indicator row shows you the bit numbers.
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