Technology of Q 2500 colour TV set

Technology of Q 2500 colour TV set2.4.1 High voltage productionQ2500 secondary H output stageThe filament voltage of the c.r.t. is assigned topin 9. On pin 4 the flyback pulse for the synchronisationof the control is assigned to pin 4.At the same time this pulse is rectified byD547 and fed to the c.r.t. plate via connectorW 549. The 60V occurring here is required bythe c.r.t. PCB for the speed modulator. TheUV+ and UV- for the vertical stage (approx. +13 V) occur in the windings between pin 6 and9 and pin 3 and 9.C532100p/500VD531RU2MR5313R312B533R5T53116W511Pin10 Pin11R5502k2R5421k8/2%32kVHFLBR548120RFPR545Just like the amplitude of the radiation currenta corrective voltage for the stabilisation of thehorizontal amplitude can be tapped at thebase, connection 10 of the high voltage winding.This radiation current dependent voltage is ledto the signal board via pin 11 of connectorW 511. The radiation current fuse and limiterare found here.R5343R35MP2017FOCUS13FOCUSUG2104869C54922nD5481N4148R5473R3L553R5581RD549C30VD547BA159C547100p/500VD558RU2MC556100p/500VB560R5C5502200uR551150k/2%R5521MC54822u/250VUV-C51122u/250VW550UVideo 5UF 43USVM21The operating voltage U 200 for the videooutput stage is tapped on the primary side ofthe pin 5 of the diode split transformer andrectified by D 531. In addition on connection 5another voltage UB -10 V and on pin 7 a voltageof UB +10 V are produced, which are felton capacitors C 535 and C 534. On UB = 136V there are 126 V and 146 V. These voltagesare required for the offset correction of thehorizontal deflector.3R5571RC5582200uD557RU2MUV+2C557100p/500V2.4.2 Horizontal- offset deflectorThe high voltage transducer also contains thecascade. The secondary winding of the stepup transformer is divided into four and thehigh voltage rectifier diodes are connectedbetween the individual winding sections. Thisform of high voltage production is possiblewithout the highly charged capacitors used upto now, which increases the reliability of highvoltage production and makes possible aspace-saving compact solution.The deflector pulse is formed in such a waythat through the deflection and S-correction alinear deflection results. This only functionshowever when the deflection is exactly central.As the Q 2500 chassis could also be usedas a VGA monitor, high demands are placedon linearity. For this reason the possibility ofoffset correction is created.The resistance voltage divider and the potentiometerof the focus and G2 adjustment isintegrated mechanically into the splitting combinationfor units with 4:3 c.r.t.s.Document Q 2500 25 © Loewe ProCollege