Yamaha-TX-497-Service-Manual电路原理图.pdf
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1、SERVICE MANUAL This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel. It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users, and have therefore no
2、t been restated. WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons, we advise all YAMAHA product owners that any ser
3、vice required should be performed by an authorized YAMAHA Retailer or the appointed service representative. IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or recognition of any applicable technical capabilities, or establi
4、sh a principle-agent relationship of any form. The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable
5、 and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributors Service Division. WARNING:Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by
6、 grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss). IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit. IMPORTANT NOTICE 100970 SERVICE MANUAL BLOCK DIAGRAM . . . . . . . . . . . . .
7、. . . . . . . . . . . . . .19 PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . . . .20 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . .2122 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2331 I CONTENTS TO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . .2 SP
8、ECIFICATIONS / . . . . . . . . . . . . . . . . . . . .3 FRONT PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 REAR PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 DISASSEMBLY PROCEDURES / . .
9、. . . . . .6 ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .711 1215 IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 DISPLAY DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 AM/FM STEREO TUNER TX-497 TX-497 2005 . All rights reserved.
10、 This manual is copyrighted by YAMAHA and may not be copied or redistributed either in print or electronically without permission. 05.09 2 TX-497 TX-497 WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or
11、 plastic (where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm. DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH
12、FOR ANY REA- SON WHATSOEVER! Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux vapor! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handli
13、ng food. TO SERVICE PERSONNEL Critical Components Information. Components having special characteristics are marked and must be replaced with parts having specifications equal to those originally installed. WALL OUTLET EQUIPMENT UNDER TEST AC LEAKAGE TESTER OR EQUIVALENT INSULATING TABLE About leadf
14、ree solder / 無鉛 The P.C.B.s installed in this unit are soldered using the following solder. 本機搭載基板付使用 下記通。 無鉛種類、修理時 下記無鉛使用推奨。 Sn+Ag+Cu(錫+銀+銅) Sn+Cu(錫+銅) Sn+Zn+Bi (錫+亜鉛+) 注意: 無鉛融点温度通常鉛入比30 40程度高、 合使用。 鉛入使得場合、交 換部品端子部周辺部無鉛取 除、無鉛鉛入十分 溶状態付。 Among some types of lead free solder currently available, it is
15、 recommended to use one of the following types for the repair work. Sn + Ag + Cu (tin + silver + copper) Sn + Cu (tin + copper) Sn + Zn + Bi (tin + zinc + bismuth) Caution: 1. As the melting point temperature of the lead free solder is about 30C to 40C (50F to 70F) higher than that of the lead solde
16、r, be sure to use a soldering iron suitable to each solder. 2. If lead solder must be used, be sure to remove lead free solder from each terminal section of the parts to be replaced and from the area around it completely before soldering, or make sure that the lead-free solder and lead solder melt t
17、ogether fully. TUNER P.C.B. OPERATION P.C.B. Side A / A 面 Side B / B 面 Lead Free Solder / 無鉛 Lead Free Solder / 無鉛 Side A Side B SMTREFLOW Process MIFLOW Process Solder Dip 3 TX-497 TX-497 FM SECTION / FM部 Tuning Range / 受信周波数範囲 U, C models . 87.5 to 107.9 MHz R, T, A, B, G, E, L models . 87.50 to 1
18、08.00 MHz J model . 76.0 to 90.0 MHz 50dB Quieting Sensitivity / 50dB SN感度 (IHF) U, C, R, T,A, L, J models Mono . 1.55 V(15.1 dBf) Stereo (1 kHz 100% MOD)21 V(37.7 dBf) Usable Sensitivity / 実用感度 (DIN) B, G, E models Mono (S/N 26 dB) . 0.9 V Stereo (S/N 46 dB) . 24 V Image Response Ratio / 妨害比 U, C,
19、R, T, J models . 40 dB A, B, G, E, L models . 80 dB IF Response Ratio / IF妨害比 .70 dB Spurious Response Ratio / 妨害比 U, C, R, T, J models . 60 dB A, B, G, E, L models . 70 dB Alternate Channel Selectivity / 実行選択度 U, C, R, T, J models . 85 dB A, B, G, E, L models Selectivity (two signals) 40 kHz Dev. 3
20、00 kHz . 70 dB Signal to Noise Ratio / 信号対雑音比 (DIN-Weighted 40 kHz) U, C, R, T, J models Mono . 82 dB Stereo . 76 dB A, B, G, E, L models Mono . 75 dB Stereo . 70 dB Harmonic Distortion / 歪率 (1 kHz) Mono . 0.1 % Stereo (B, G: 40 kHz Dev.) .0.2 % Stereo Separation / (1 kHz) B, G: 40 kHz Dev. . 50 dB
21、Frequency Response / 周波数特性 30 Hz to 13 kHz . 00.5 dB MW SECTION / AM部 Tuning Range / 受信周波数範囲 U, C, R models .530 to 1710 kHz T, A, B, G, E, L, J models . 531 to 1611 kHz Usable Sensitivity / 実用感度 . 200 V/m Selectivity / 選択度 . 32 dB Signal to Noise Ratio / 信号対雑音比 . 50 dB Image Response Ratio / 妨害比 .
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