Date : 10/02/98 762457
Deflection Switching Module
762457
10
Each horizontal deflection yoke consists of two horizontal windings which may be
connected in either a series or parallel configuration. The inductance of the parallel
connection is obviously lower than the series configuration (parallel and series
inductance uses the same formula as resistance) therefore they are connected in
parallel for the "high" frequency mode.
The lower inductance in the parallel configuration causes the resonant frequency of
the flyback pulse to increase, thereby producing a more rapid horizontal retrace.
Note: HDM is the mid-point of the two series connected deflection MOSFETS. HDL
is the common connection to the three horizontal yoke windings, that supplies the
yokes with the +HTHD voltage, after passing through Q3 and the linearity coil.
The DC horizontal shift voltage from the "Focus and Shift Board (76 2271) is applied
between HDHX and HDLX (X stands for R, G or B or the Red, Green or Blue) of the
red, green and blue deflection yokes. The HDLX is in fact a feedback to the Focus
+ SHIFT board in order to to stabilise the horizontal width.
In the LOW FREQ mode, the two horizontal width alignment coils are in series. When
switched to the "High Freq." mode only one coil is in the circuit, (see schematics).
S10, S20 and S30 allow the horizontal scan to be inverted to adapt the projector for
a front or rear projection. S10 is also used to provide the HSIC information to the
controller board , so that the controller board will know the configuration of the
horizontal scan switches.
The HSI also goes to the "HOR SHIFT+FOCUS" board and is used by Q1 and Q2
to invert the shift voltages on P1 and P2 (horizontal shift Red and Blue).
Note that this board also contains the switch for the inversion of the vertical scan.
Here the same VSI info can be used for both, the controller and the Vert Defl board
(similar to Hor Defl).
The Scan Fail loop (SF3-SF4-SF5-SF6) passes through two contacts of the
deflection connectors. In the event that one of these yoke connectors is discon-
nected, the projector will go into scan fail, terminating the EHT.
Technical description
Scan coil switching (762457)
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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