Hitachi CG2026S, Service Manual

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USING COLOUR BUTTONS ON SERVICE MENU
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 switched the PICTURE MODE to 4:3 or 16:9 on service menu. It is usefull when it is necessary to
adjust 16:9 picture mode vertical size.
YELLOW BUTTON : It switches to VERTICAL SCAN DISABLE mode. It is usefull to adjust screen voltage.
BLUE BUTTON : It is used to adjust AGC and IF automatically on service 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 (224.25MHz)
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 38.9MHz . 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 33.9MHz . 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 standart 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.
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.