28JW-76E
ADJUSTMENT PROCEDURES
All adjustments to this chassis, except for focus, are carried out in the Service Mode.
""""" SERVICE MODE
The Service Mode is provided to enable the engineer to correctly set up the receiver to the CRT fitted in the set.
Note that the value of these adjustments may vary from one receiver to another.
CH
To enter the Service Mode, carry out the following procedure.
1. Connect a test pattern to the antenna terminal.
2. Tune the receiver to this signal.
3. Turn the receiver off using the mains switch.
4. Press volume down and channel up buttons on the
front of the receiver at the same time.4
5
5. Keeping these buttons pressed, turn the mains on.
6. When the set starts up it will be in Service Mode, then the following
Figure 1
On Screen Display appears:
RED
GREEN
YELLOW
BLUE
Figure 2
7. Release the two buttons.
""""" Use the channel up and down buttons to move between the options.
""""" Use the volume control buttons to change the data.
""""" To store the data: use the Stand-by button(1) or Store button(11) on the remote control.
""""" To exit the Service Mode, turn the receiver off using the Main switch.
Note: In this Service Mode, by using the colour buttons of Remote Control is possible to pass directly to the adjustments
that are indicated inside of each coloured box (see Figure 2), as follows.
Press the RED button to access to Geometry adjustments.
Press the GREEN button to access to NVM adjustments.
Press the YELLOW button to access to Automatic Gain Control adjustments.
Press the BLUE button to access to CUT OFF adjustments.
Adjustment menu:
The following adjustments can be carried out in the Service Mode.
" Horizontal shift" Vertical angle" Hot Cut RED" NVM PAGE
" Horizontal size" Vertical bow" Hot Cut GREEN" NVM POSITION
" Pin phase" Vertical size" Hot Cut BLUE" NVM VALUE
" Pin amplitude" Vertical S-correction" Cold Cut RED
" Upper corner correction" Vertical shift" Cold Cut GREEN
" Lower corner correction" Cut RED" Cold Cut BLUE
" Extreme corner correction" Cut GREEN" Automatic Gain Control
" Vertical linearity" Cut BLUE" Subcarrier adjustment (ONLY PAL)
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ACEC
SHARP
