ADJUSTMENT PROCEDURES
Part-1
All adjustments for this chassis, except for focus, are to be carried out by the service mode. The service mode is provided to enable technicians to correctly set up the receiver to the CRT fitted in set. These adjustments may vary set to set.
TO ENTER SERVICE MODE
- Connect a test pattern to antenna terminal or on-air antenna.
- Tune in the signal.
- Turn the receiver OFF using its main switch.
- Press and Hold [Ch-Up & Vol-Dn] buttons on the front panel of the set, and power it ON by its front panel power switch.
- When the set start up, it will be in service mode.
- Release the two buttons.
- Use Channel Up or Channel Dn buttons to move between options.
- Use the Volume control buttons to change the data values to selected items.
- Use Standby button to store the selected data into memory.
- To Exit from service mode, turn OFF the receiver by its main switch.
In service mode, the screen will indicate:
SERVICE SOFTWARE version **.**
SW on: xxxx SW off: xxxx Hours On: xxxx
The figures displayed in "xxxx" locations are hexadecimal representations of the number of times that particular function has been executed. For example: if the hexadecimal number displayed after SW ON was 0E4A, this would correspond to the receiver being tuned on 3658 times.
SERVICE MODE ADJUSTMENTS
The following adjustments can be performed out in service mode.
- HORIZONTAL SHIFT.
- EAST WEST WIDTH.
- PIN PHASE.
- PIN AMP.
- UPPER CORNER CORRECTION.
- LOWER CORNER CORRECTION.
- VERTICAL LINEARITY
- VERTICAL AMPLITUDE.
- S-CORRECTION.
- VERTICAL SHIFT.
- RED GAIN.
- BLUE GAIN.
- GREEN GAIN.
- RED CUT OFF.
- GREEN CUT OFF.
- BLUE CUT OFF.
- ALTER NVM PAG.
- ALTER NVM POS.
- ALTER NVM VAL.
- TELETEXT MIX MODE CONTRAST.
- TELETEXT CONTRAST.
- OSD CONTRAST.
- DVCO ADJUSTMENT [PAL ONLY].
- DVCO ADJUSTMENT [NTSC ONLY]
- AGC ADJUSTMENT.
- AFT ADJUSTMENT.
- OPC VALUE.
- AUTO INSTALLATION ON/OFF
GEOMETRY ADJUSTMENTS.
All geometry adjustments are based on an internally generated test pattern. When carrying out any of these geometry adjustments, use the internally generated test pattern for reference.
Note that the receiver should be set to FULL MODE before carrying out any geometry adjustments. This can be achieved by pressing the Wide-Screen mode button on the remote control, until FULL MODE appears on the OSD. This can done only out of service mode.
Contd:
