Technology of Q 2500 colour TV set

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Technology of Q 2500 colour TV setC1584C1589LS-R LS-LLS-L28C2081W2091/6 AC3 LCR2961R2962R1584R1589L1571C2967C2084R2084W1610/5C1571# #Q2083Q2966R2966 R2082R2967R2964Q2081C2082C2083R2963R1581R1582R1587 R1586Q1586Q1581R2081R2083U5UMD2967D2964C2968C2963Q2961W1610/1W1610/2R2028R1497R1489R1493R1492Q1453Q1473R1473Q1433R2027MSP/77R2026C2027Sound mute switchR1556Q2027rotW1494LweissQ1498R1498R1488Q1483 R1496 R1491RR1495R1483Q1496Q1491C1495R1490C1490U12LS-R27MSPR1453R1554RS C041 R077 RS LSR080MuteSurroundQ007R078Q006R079LS C037 R069Q005R072Q004Q008R088Q010C049C050Q009LRMute Headphonesto W1521/10/11HF transmitterW1431/2/4R1433MuteQ1556Q1551R1552R1551Q1552MuteStereooutput stage/BBMute LFEW1551/8Mute Front L/RRR1499R1494Q1493LW2091/4/5MSP Pin 36/37LFE W2091/1 MSP Pin 30W2091/7 AC3 RC(# not used with AC 3)On/OffCCU Pin 78R093R071R070AC3 module/Dolby DigitalR092R089 R090R091I01/Pin 30U12MuteSignal boardDocument Q 2500 118 © Loewe ProCollege
Technology of Q 2500 colour TV setOn the Dolby Digital Module the two surroundchannels are muted via transistors Q 8/Q 4/5and Q 6/7. If a data error is detected on theDolby Digital Module during digital sound signalprocessing, pin 30 on I 01 outputs H level.Via the two transistors Q 9 and Q 10 the mutefunction is then activated. For the mute functionthe Dolby Digital Module represents bothinput and output.As you can see from the mute circuit, somesounds have an output line, as, for example,for the LFE channel Q1552/56, two transistorsare used. This measure improves the mutebehaviour and the error rate of these stages.5.2.16 Headphone amplifierAs in previous models the front panel of thedevice has a connector for headphones. Asfor the loudspeaker branch the signals arealso generated in the MSP 3411. As alreadydescribed, the loudspeaker control for theheadphone control is also implemented in it.These signals are output in pulse width modulatedform on pins 24 and 26 of the MSP andintegrated with external RC components intoan VF signal at up to 1.2 Vss. They are fedrespectively to an amplifier stage, consistingof 2 transistors Q 1441/46 and Q 1461/66.This stage amplifies them to 9 Vss and outputsthem via a decoupling through C 1448/68to the headphones socket and pin 2/4 on pinconnector W 1431 for the HF transmitter.The headphones volume can be controlled in63 stages and the setting displayed on thescreen.Document Q 2500 119 © Loewe ProCollege
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Technology of Q 2500 colour TV set

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