Technology of Q 2500 colour TV set
Technology of Q 2500 colour TV set
Technology of Q 2500 colour TV set
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<strong>Technology</strong> <strong>of</strong> Q <strong>2500</strong> <strong>colour</strong> <strong>TV</strong> <strong>set</strong>Beam current limitationD531R53112(9)C51132kVR552UvidR551Signal boardR2604R2611U8D2611R2603BCLC2604C2603I 252143 Video/deflectionProcessor14 45T53110FocusUG2D548 D549C549W511/Pin11Basic boardFPW1511/Pin11R2609C2608R2608R1043D2544FPR2608R2607 D2607R2606R2544D2549R2547R2552E/W amp. compensationPhase compensationR2636R2549Q2638R2637R2638C2638Q2639R2546U8The second protective switch monitors the Vflyback pulse that is fed from I 561 /pin 6 viaR 563 to the pin connector W 511 /pin 4. Onthe signal board this V flyback pulse is rectifiedby diode D 2591/1769 and integrated withcapacitor C 2592/2593. With the voltage availableon capacitor C 2992/2593, Q 2594 conducts.The collector <strong>of</strong> Q 2594 is then at thesame potential as L, and diode D 2594 isblocked.If there is no flyback pulse due the absence <strong>of</strong>a V output stage, no voltage can build up oncapacitors C 2592/2594 and Q 2594 blocks.Pin 94 <strong>of</strong> the CCU is <strong>set</strong> to H level via diode D2594.If pin 94 <strong>of</strong> C 161 is <strong>set</strong> to H level by the absence<strong>of</strong> a V flyback pulse in the operatingcondition <strong>of</strong> the unit, as described, after 2seconds the CCU switches the device back tostandby operation. This permits safe shutdown <strong>of</strong> the device with a faulty deflectioncontroller.2.7 Beam current limitationTo limit the beam current the Q <strong>2500</strong> chassisis provided with an average value control. Thelimit switch is integrated into TDA 9332.Document Q <strong>2500</strong> 32 © Loewe ProCollege
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