Grundig ELEGANCE 70 ST 70-300 DOLBY Servicehandbuch Seite 32

GRUNDIG Service
Alignment
13. Picture Feed in a convergence test pattern.
sharpness On 16:9 units, set the picture format to 16:9.
(TV sets without Contrast:
focus block) Set the brightness so that the black test pattern background
just brightens.
Line sharpness Feed in a convergence test pattern.
(TV sets with On 16:9 units, set the picture format to 16:9.
focus board) Contrast:
Set the brightness so that the black test pattern background
just brightens.
Line sharpness Feed in a convergence test pattern.
(TV sets with On 16:9 units, set the picture format to 16:9.
focus block) Contrast:
Set the brightness so that the black test pattern background
just brightens.
14. Screen grid Feed in a black raster.
voltage U Adjust the picture screen brightness so that the grey area
SG
just darkens.
Switch the unit to AV mode.
High-impedance voltmeter:
Determine the test point with the highest voltage level.
15. Adjustment of The bridge coil L53574 is adjusted during production and
the bridge coil should not be re-adjusted any more.
L53574
Call up the "Screen geometry" menu via "EASY DIALOG" –>
"Installation" (to page 2) –> "Dealer service menu" –>
"8500".
Set the picture width to minimum.
Oscilloscope channel 1: collector T53501
Oscilloscope channel 2: cathode D53572
16. IF-Type Call up the "IF-Type" menu via "EASY DIALOG" –>
"Installation" (to page 2) –> "Dealer service menu" –>
"8500" –> "Hardware settings".
Preparations
Maximum
Maximum
Maximum
Test point R, G, B
(picture tube plate)
2 - 6
Alignment procedure
Use the FOC control on the picture tube panel to adjust the
vertical lines about 5 cm to the right and left picture border
for minimum horizontal width.
Use the FOC control on the picture tube panel to adjust the
horizontal lines in the picture centre for minimum vertical
width. When this is done, use the focus control on the focus
board to adjust the vertical lines about 5 cm to the right and
left picture border for minimum horizontal width.
Use the FOCUS 1 control on the focus block to adjust the
horizontal lines in the picture centre for minimum vertical
width. The upper border sharpness must not be worse than
the centre sharpness - set to average value if necessary.
When this is done, use the FOCUS 2 control on the focus
block to adjust the vertical lines about 5 cm to the right and
left picture border for minimum horizontal width.
Units without focus block:
Use the SG control (right control on the regulating section)
on the picture tube panel to adjust 167,5V
Units with focus block:
Use the "SCREEN" control (bottom control on the focus
±
block) to adjust 167,5V 2.5V.
Check for equal impulse width of the oscillograms and
correct if necessary using the coil L53574.
Re-adjust the picture width according to the test pattern.
Adjust to IF Type built into the set.
National, Multi 8, Multi 9.
DIGI 100
±
2.5V.