Pioneer TX-9500II Tuner
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TX-9500II
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Beschreibung:
Stereo AM/FM Tuner

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Highly Sensitive FM Front End Rejection of spurious signals, images and other types of interference is strongly enhanced by the S-gang variable capacitor tuning circuit and three high gain, low noise dual gate MOS FET devices. This design also reduces phase distortion in the front end, leading to linear phase response in the RF stage. Inclusion of a buffer Amplifier in the local oscillator circuit prevents interference under strong signal input conditions, ensuring enjoyment of stable FM reception. Selectable Bandwidth IF Amplifier IF Amplifier response can be selected for wide or narrow bandwidth according to signal conditions. In the wideband mode, a newly developed SAW (surface acoustic wave) filter and 4 pole phase linear filter are utilized. These possess excellent group delay time flatness characteristics and provide superior phase response in comparison to conventional ceramic filters. Nearly ideal wide phase response and selectivity are realized together with ultra low distortion. In the narrow band mode, a 10 element ceramic filter is switched in to provide ultra high selectivity. This setting allows comfortable reception in locations where there is strong adjacent interference to the desired station. Automatic Pilot Signal Cancelling Circuit Earlier multiplex circuit designs employed 19kHz pilot signal blocking filters and thus exhibited a hint of reduction in frequency response at the high end of the band. This drawback is overcome by a newly developed PLL 1C which includes an automatic pilot signal cancelling circuit. Since carrier leakage can also be amply suppressed, the new device actually extends frequency response at high frequencies. The demodulator includes a negative feedback (NFB) circuit for improved SN ratio and minimum distortion. Convenient Recording Facilities High quality recordings from FM broadcasts depend in large measure on proper recording level settings and correct FM antenna direction. The REC LEVEL CHECK switch on the ΤΧ-9500Π activates a built-in 440Hz tone burst signal corresponding to a 50% modulated FM level which can be used as a reference for setting the recording level controls on the tape deck. In addition to determining levels prior to recording, this feature can be used for correct balance control settings on a stereo system, since an equal signal is provided to both stereo channels. An FM MULTIPATH switch is included which produces an audible signal that can be effectively employed for determining the optimum FM antenna direction. This signal can also be monitored with an oscilloscope. High Performance AM Tuner with Newly Developed 1C The AM section incorporates a 3-gang variable capacitor tuned type RF Amplifier circuit and a highly sensitive, low distortion 1C. Together with possessing superb imaging and IF rejection properties, selectivity and frequency response become advanced to new levels. Optimum AGC voltage is supplied to each section, providing stable reception with low spurious interference and distortion even in localities with strong field strength conditions. AF 1C Includes Built-in Muting Circuit Full NFB is applied in the wide dynamic range differential direct coupled audio frequency Amplifier circuit, while the muting circuit incorporates the most recent electronic circuit technology. By including both these circuits in a newly developed 1C, low distortion and high S/N are realized which approach the values associated with test instrumentation. Smooth, noise-free reception is thus assured.

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Schaltplan
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Schaltplan
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4
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532.92 Kbytes (545709 Bytes)
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english
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29 September 2020
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Bedienungsanleitung
Dokumenttyp:
Bedienungsanleitung
Seiten:
12
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5.39 Mbytes (5651882 Bytes)
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english
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Dokument-ID:
78C00Y7BI3
Datum:
01 Januar 1978
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Gescanntes Dokument, alles ist lesbar.
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29 September 2020
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Information

Features ... 2 Installation Cautions ... 3 Connection Diagram ... 3 Connections ... 4 Antenna Connections ... 4 Front Panel Facilities ... 6 Listening to Broadcasts ... 6 Effective Operation ... 8 FM-Dolby Reception ... 10 Specifications ... 11 Conditions Frequently Mistaken for Malfunction ... 12

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Serviceanleitung
Dokumenttyp:
Serviceanleitung
Seiten:
86
Größe:
4.79 Mbytes (5027074 Bytes)
Sprache:
english
Revision:
Dokument-ID:
Datum:
01 November 1976
Qualität:
Gescanntes Dokument, alles ist lesbar.
Upload Datum:
29 September 2020
MD5:
c0d007201f179b1255b2810d1aa212b7
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183

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1. SPECIFICATIONS ... 5 2. CONNECTION DIAGRAM ... 6 3. FRONT PANEL FACILITIES ... 7 4. BLOCK DIAGRAM ... 9 5. CIRCUIT DESCRIPTIONS 5.1 AM Tuner ... 11 5.2 FM Tuner ... 11 5.3 REC LEVEL CHECK Signal Generator Circuit ... 15 5.4 Power Supply Circuit ... 15 6. DISASSEMBLY ... 16 7. PARTS LOCATION 7.1 Front Panel View ... 17 7.2 Front View with Panel Removed ... 18 7.3 Top View ... 19 7.4 Rear Panel View ... 20 8. DIAL CORD STRINGING ... 21 9. ADJUSTMENTS 9.1 FM Section ... 22 9.2 AM Section ... 26 10. EXPLODED VIEWS 10.1 TopSide ... 27 10.2 Bottom Side ... 29 10.3 Nomenclature of Screws, Washers and Nut ... 31 11. PACKING ... 32 12. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LIST 12.1 Schematic Diagram and Miscellaneous Parts List ... 33 12.2 FM Front End (AWB-023) ... 36 12.3 AM FM IF Assembly (AWE-070) ... 37 12.4 MPX AF Assembly (AWD-009) ... 45 12.5 Power Supply Assembly (AWR-128) ... 50 Additional Service Manual 1. CONTRAST OF MISCELLANEOUS PARTS ... 54 2. KC TYPE 2.1 Schematic Diagram and Miscellaneous Parts List ... 56 2.2 Power Supply Assembly (AWR-129) ... 59 2.3 Packing ... 61 3. HG TYPE 3.1 Schematic Diagram and Miscellaneous Parts List ... 62 3.2 MPX AF Assembly (AWD-008) ... 65 3.3 Power Supply Assembly (AWR-130) ... 70 3.4 Packing ... 73 4. S TYPE 4.1 Schematic Diagram and Miscellaneous Parts List ... 74 4.2 MPX A F Assembly (AWD-010) ... 77 4.3 Power Supply Assembly (AWR-131) ... 82 4.4 Switch Assembly (AWX-113) ... 85 4.5 Packing ... 86

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