Date : 10/02/98 R7621127
Sync+Vertical Deflection
R7621127
15
Adjustments procedures
Adjustments on the main
module
a. Hysteresis-center adjustment for deflection switching relay P1
This control adjusts the switching point of the relay to adapt the deflection coils for
low and high line input frequencies.
- The projector has to operate on a signal (the frequency is not relevant)
- Adjust the potentiometer P401 for synchronisation of the picture (Vertical lock)
a. Vertical Hold P401
Adjustments on the sub
module
b. Vertical Parabola P400-P402
Adjustment of the
Symmetry
of the vertical parabola P402
- The projector has to operate on a signal with standard frequency.
- Connect the oscilloscope to the resistor R456 (side: output pin 1 of IC409).
- Adjust the potentiometer P402 for a symmetrical curve of the parabola signal.
Adjustment of the
Amplitude
of the vertical parabola P400
- The projector has to operate on a signal with standard frequency.
- Connect the oscilloscope to the resistor R456 (side: output pin 1 of IC409).
- Adjust the potentiometer P400 for an amplitude of the parabola signal of 1.5V.
4 kHz
Default setting
75 kHz
Deflection coils
series connection
Deflection coils
parallel connection
Hysteresis curve
Freq.
b. Main Vertical SHIFT adjustment for RED and BLUE image
Note
: the mentioned adjustments are provided on the main module in order to correct the Vert. Shift
range and the Vert. Amplitude of the red and blue picture after replacement of the respective picture
tubes.
Preparation
Adjust the vertical raster centering controls for Red and Blue in their mid position.
The numeric indicator under the respective bar scale indicates 50.
(Refer to the Owner's manual of the projector - Guided or Random adjustment
mode).
Alignment
Use the vertical shift controls P3 for RED and P2 for BLUE to shift vertically the Red
and Blue image until the center coincides with the center of the Green image.
c. Vertical amplitude correction for RED and BLUE image
Adjust potentiometer P4 for the Red image and P5 for the Blue image to obtain the
same vertical amplitude as the Green image.
Factory default adjustment:
mid
position of the potentiometer (switching
point of the relay at approx. 75 kHz with
a hysteresis of 4 kHz).
Adjustment range
: the potentiometer
P1 adjusts the switchover point of the
relay between 60 and 90 kHz.
Summary of Contents for GRAPHICS 1209S
Page 4: ...BARCO PROJECTION SYSTEMS GRAPHICS 1209S 90 00972 230V AC 90 00977 120V AC SAFETY NOTICE...
Page 9: ...BARCO PROJECTION SYSTEMS GRAPHICS 1209S 90 00972 230V AC 90 00977 120V AC GENERAL INFORMATION...
Page 28: ...BARCO PROJECTION SYSTEMS GRAPHICS 1209S 90 00972 230V AC 90 00977 120V AC SERVICE SHEETS...
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