Sharp 70GF-63E, Service Manual

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70GF-63E
SERVICE ADJUSTMENTS
All the adjustments required for this chassis will be done in Service Mode, except G2 and Focus.
••••• G2 ADJUSTMENT
1.Receive cross hatch pattern signal.
2. Set contrast to 80/100 and brightness to 40/100.
3. Connect the oscilloscope to the red cathode and adjsust G2 to read
140V on the sensor pulse as in the drawing:
NOTE:
Oscilloscope should be adjusted for vertical TV field trigger and synchronized
with wideo signal.
••••• SERVICE MODE FUNCTION
This mode function is provided to assist with the settings of those adjustments that may vary from one
Picture Tube to another, or between models.
In order to use the Service Mode:
1. Connect Test Pattern signal to antenna terminal.
2. Press main switch to «OFF».
3. Press volume-down and channel-up buttons and
main switch to «ON» simultaneously.
4. Service mode is now entered.
The required adjustments can then be made from the Remote Control Unit.
The only buttons required are the following:
Up/Down-channel for movement in adjustment options menu; Up/Down-volume are used to carry out an
adjustment in said menu; ON/OFF is used to memorize a new adjustment.
Adjustment menu is as follows:
To exit service mode, press main switch ot OFF.
Adjustment menu is as follows:
Horizontal:
-Adjust HORIZONTAL SHIFT.
-Adjust E-W WIDTH.
-Adjust PIN PHASE.
-Adjust PIN AMPLITUDE.
-Adjust UPPER CORNER CORRECTION.
-Adjust LOWER CORNER CORRECTION.
All adjustments for Geometries are based on internal pattern (fig.1)
The procedure for making adjustments is as follows:
Vertical:
-Adjust VERTICAL AMPLITUDE.
-Adjust S-CORRECTION.
-Adjust VERTICAL SHIFT.
-Adjust VERTICAL LINEARITY.
Fig.1
CH
1
2
140 V
CH1 gnd
-RED CUT OFF.
-GREEN CUT OFF.
-BLUE CUT OFF.
-ALTER NVM PAGE.
-ALTER NVM POSITION.
-ALTER NVM VALUE.
-TELETEXT MIX MODE CONTRAST.
-TELETEXT CONTRAST.
-OSD CONTRAST.
-DVCO ADJUSTMENT (Only NTSC).
-DVCO ADJUSTMENT (Only PAL).
-AGC ADJUSTMENT.
-AFT ADJUSTMENT.
-ROTATION OFFSET.
-AUTOINSTALLATION ON/OFF. -SERVICE SOFTWARE AND HEXADECIMAL
COUNTER DISPLAY: «SW ON XXXX SW OFF
XXXX HOURS ON XXXX
-HORIZONTAL SHIFT.
-EAST WEST WIDTH.
-PIN PHASE.
-PIN AMP.
-CORNER AMPLITUD.
-CORNER SYMMETRY.
-VERTICAL LINEARITY.
-VERTICAL AMPLITUDE.
-S CORRECTION.
-VERTICAL SHIFT.
-RED GAIN.
-GREEN GAIN.
-BLUE GAIN.