Hitachi VTMX900ECT Manuel D'entretien page 70

2-8
Schaltungsbeschreibung
1. Schaltnetzteil PS (PS - Part) .......................................................................................................................................................................... 9
1.1 Technische Daten: .......................................................................................................................................................................................... 9
1.2 Funktionsprinzip: ............................................................................................................................................................................................ 9
1.3 Netzeingangsteil ............................................................................................................................................................................................. 9
1.4 Anlauf bei Netz-ein: ........................................................................................................................................................................................ 9
1.5 Normalbetrieb: ................................................................................................................................................................................................ 9
1.6 Überlast, Leistungsbegrenzung, Burst-Mode: .............................................................................................................................................. 10
1.7 Standby Mode: ............................................................................................................................................................................................. 10
2. Bedienteil DC (DC - Part) ............................................................................................................................................................................. 10
2.1 Auswertung der Tastenmatrix ....................................................................................................................................................................... 10
2.2 IR- Empfänger und Signalauswertung ......................................................................................................................................................... 10
2.3 Ansteuerung und Funktion der VFD-Anzeige .............................................................................................................................................. 10
3. Central Control AIO (AIO - Part) ................................................................................................................................................................. 11
3.1 Analoginterface zum µC : ............................................................................................................................................................................. 11
3.2 Bandende - LED - Ansteuerung : ................................................................................................................................................................. 11
3.3 CMT-Erkennung (Videoerkennung mit CSYNC) .......................................................................................................................................... 11
3.4 EE-PROM ..................................................................................................................................................................................................... 11
3.5 Easy Link (P50) ............................................................................................................................................................................................ 11
3.6 Shuttle: ......................................................................................................................................................................................................... 11
3.7 Satmouse ...................................................................................................................................................................................................... 11
4. Deckelektronik DE (DE - Part) .................................................................................................................................................................... 11
4.1 CTL - Stufe ................................................................................................................................................................................................... 11
4.2 Power On Reset (POR) - Generator ............................................................................................................................................................ 12
4.3 Das Sensorinterface : ................................................................................................................................................................................... 12
4.4 Schnittstelle zum Kopfradmotortreiberteil .................................................................................................................................................... 12
4.5 Schnittstelle zum Fädelmotortreiberteil: ....................................................................................................................................................... 12
4.6 Schnittstelle zum Capstanmotor .................................................................................................................................................................. 12
5.Frontend FV (FV - Part) ................................................................................................................................................................................. 13
5.1 Das Frontend besteht aus folgenden Teilen : .............................................................................................................................................. 13
5.2 Das Frontend wurde für den Empfang folgender Systeme konstruiert: ...................................................................................................... 13
5.3 Tuner-Modulator (TUMOD) .......................................................................................................................................................................... 13
5.4 ZF-Selektion ................................................................................................................................................................................................. 13
5.5 ZF-Demodulator ........................................................................................................................................................................................... 13
6. Video Signal Prozessing VS (VS - Part) ..................................................................................................................................................... 13
6.1 Umschaltfunktionen des Signalelektronik IC´s LA71595M [7004-B]: .......................................................................................................... 13
6.2 Aufnahme : ................................................................................................................................................................................................... 14
6.2.1 Luminanz ................................................................................................................................................................................................... 14
6.2.2 Chrominanz PAL ........................................................................................................................................................................................ 14
6.2.3 MESECAM ................................................................................................................................................................................................ 14
6.2.4 SECAM L ................................................................................................................................................................................................... 14
6.2.5 FM Signal .................................................................................................................................................................................................. 14
6.3. Wiedergabe: ................................................................................................................................................................................................ 15
6.3.1 FM Signal .................................................................................................................................................................................................. 15
6.3.2 Luminanz ................................................................................................................................................................................................... 15
6.3.3 Chroma PAL .............................................................................................................................................................................................. 15
6.3.4 Chroma MESECAM ................................................................................................................................................................................... 15
6.3.5 Chroma SECAM L ..................................................................................................................................................................................... 15
6.3.6 NTSC ......................................................................................................................................................................................................... 15
6.3.7 PAL M,N ..................................................................................................................................................................................................... 15
6.4 Allgemeines .................................................................................................................................................................................................. 15
7. Audio Linear (AL - Part) ............................................................................................................................................................................... 16
7.1 Audio I/O für 1-Scart Version ........................................................................................................................................................................ 16
7.2 Audio I/O für 2-Scart Version ........................................................................................................................................................................ 16
7.3 Audio Linear Aufnahme ................................................................................................................................................................................ 16
7.4 Audio Linear Wiedergabe ............................................................................................................................................................................. 16
7.5 Audio Linear Muting ...................................................................................................................................................................................... 16
8. Audio HiFi - für Stereo Geräte (AF - Part) .................................................................................................................................................. 16
8.1 Allgemein ...................................................................................................................................................................................................... 16
8.2 Audio I/O ....................................................................................................................................................................................................... 16
8.3 Audio HiFi Aufnahme .................................................................................................................................................................................... 16
8.4 Audio HiFi Wiedergabe ................................................................................................................................................................................. 16
8.5 Schnittstelle zum Audio Linear .................................................................................................................................................................... 16
9. IN/OUT (IO - Part) .......................................................................................................................................................................................... 17
9.1 Video: ............................................................................................................................................................................................................ 17
9.1.1 Audio für 2-Scart Version: ......................................................................................................................................................................... 17
9.2 Decoderbetrieb: (REC oder STOP) .............................................................................................................................................................. 17
9.2.1 Programmplatz mit Decoder (Frontend) ................................................................................................................................................... 17
9.2.2 Externer Eingang mit Decoder .................................................................................................................................................................. 17
10. Follow Me (FOME - Part) ........................................................................................................................................................................... 17
11. VPS/PDC-, On Screen Display (VPO - Part) ............................................................................................................................................ 17
11.1 VPS/PDC .................................................................................................................................................................................................... 17
11.2 OSD-PART .................................................................................................................................................................................................. 17
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