Yamaha-TX497-tun-sm(1) 维修电路原理图.pdf
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1、SERVICE MANUALThis 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 alreadyknown and understood by the users, and have therefore not b
2、een restated.WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in personalinjury, destruction of expensive components, and failure of the product to perform as specified. For these reasons,we advise all YAMAHA product owners that any service r
3、equired should be performed by an authorized YAMAHARetailer or the appointed service representative.IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitute authorization, certification orrecognition of any applicable technical capabilities, or establish a prin
4、ciple-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 servicedepartments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable andspecifi
5、cations are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact thedistributors Service Division.WARNING:Static discharges can destroy expensive components. Discharge any static electricity your body may haveaccumulated by grounding your
6、self 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 NOTICE100970SERVICE MANUALBLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . .
7、. . . .19PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . . . .20SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . .2122PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2331I CONTENTSTO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . .2SPECIFICATIONS / . . . . . .
8、 . . . . . . . . . . . . . .3FRONT PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4REAR PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . .45INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6DISASSEMBLY PROCEDURES / . . . . . . . .6ADJUSTMENTS . . .
9、. . . . . . . . . . . . . . . . . . . . . . . .7111215IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16DISPLAY DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17AM/FM STEREO TUNERTX-497TX-497 2005 . All rights reserved.This manual is copyrighted by YAMAHA
10、and may not be copied or redistributed either in print or electronically without permission.05.09RadioFans.CN 收音机爱 好者资料库2TX-497TX-497WARNING: CHEMICAL CONTENT NOTICE!The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or plastic(where applic
11、able) 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 FOR ANY REA-SON WHATSOEV
12、ER!Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or exposeeyes to solder/flux vapor!If you come in contact with solder or components located inside the enclosure of this product, wash your hands beforehandling food.TO SERVICE PERSONNELC
13、ritical Components Information.Components having special characteristics are markedand must be replaced with parts having specificationsequal to those originally installed.WALLOUTLETEQUIPMENTUNDER TESTAC LEAKAGETESTER OREQUIVALENTINSULATINGTABLEAbout leadfree solder / 無鉛The P.C.B.s installed in this
14、 unit are soldered using thefollowing 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3040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 recommended to use one of the following types for therepair
15、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 solderis about 30C to 40C (50F to 70F) higher than that ofthe lead solder, be sure to use a soldering iron suitableto each solder.2. If lead
16、solder must be used, be sure to remove lead freesolder from each terminal section of the parts to bereplaced and from the area around it completely beforesoldering, or make sure that the lead-free solder andlead solder melt together fully.TUNER P.C.B.OPERATION P.C.B.Side A / A 面Side B / B 面Lead Free
17、 Solder / 無鉛Lead Free Solder / 無鉛Side ASide BSMTREFLOW ProcessMIFLOW ProcessSolder DipRadioFans.CN 收音机爱 好者资料库3TX-497TX-497 FM SECTION / FM部Tuning Range / 受信周波数範囲U, C models . 87.5 to 107.9 MHzR, T, A, B, G, E, L models . 87.50 to 108.00 MHzJ model . 76.0 to 90.0 MHz50dB Quieting Sensitivity / 50dB S
18、N感度 (IHF)U, C, R, T,A, L, J modelsMono . 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 modelsMono (S/N 26 dB) . 0.9 VStereo (S/N 46 dB) . 24 VImage Response Ratio / 妨害比U, C, R, T, J models . 40 dBA, B, G, E, L models . 80 dBIF Response Ratio / IF妨害比 .70
19、dBSpurious Response Ratio / 妨害比U, C, R, T, J models . 60 dBA, B, G, E, L models . 70 dBAlternate Channel Selectivity / 実行選択度U, C, R, T, J models . 85 dBA, B, G, E, L models Selectivity (two signals) 40 kHz Dev. 300 kHz . 70 dBSignal to Noise Ratio / 信号対雑音比 (DIN-Weighted 40 kHz)U, C, R, T, J modelsMo
20、no . 82 dBStereo . 76 dBA, B, G, E, L modelsMono . 75 dBStereo . 70 dBHarmonic 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 dBFrequency 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 mod
21、els .530 to 1710 kHzT, A, B, G, E, L, J models . 531 to 1611 kHzUsable Sensitivity / 実用感度 . 200 V/mSelectivity / 選択度 . 32 dBSignal to Noise Ratio / 信号対雑音比 . 50 dBImage Response Ratio / 妨害比 . 40 dBSpurious Response Ratio / 妨害比 . 50 dBHarmanic Distortion / 歪率 . 0.3 % LW SECTIONTuning RangeB, G, E mode
22、ls . 153 to 288 kHzUsable SensitivityB, G, E models . 400 V/mSelectivityB, G, E models . 32 dBSignal to Noise RatioB, G, E models .50 dBImage Response RatioB, G, E models .40 dBSpurious Response RatioB, G, E models .50 dBHarmanic DistortionB, G, E models . 0.3 % AUDIO SECTION / 部Output Level / Imped
23、ance(出力電圧 / )(Fixed)U, C, R, T, A, L, J modelsFM 100 % MOD 1 kHz . 900 mV/2.2 k-ohmsMW/AM/LW 30 % MOD 1 kHz .150 mV/2.2 k-ohmsB, G, E modelsFM 100 % MOD 1 kHz . 500 mV/2.2 k-ohmsMW/LW 30 % MOD 1 kHz .200 mV/2.2 k-ohms GENERAL / 総合Power Supply / 電源電圧U, C models . AC120V, 60HzR, L models . AC110 to 12
24、0V, 220 to 240V, 50/60HzT model . AC220V, 50HzA model .AC240V, 50HzB, G, E models .AC230V, 50HzJ model . AC100V, 50/60HzPower Consumption / 消費電力 .7 WDimensions / 寸法 (W x H x D) . 435 x 86 x 271mmWeight / 質量 . 3.2 kgFinish / 仕上Gold color .T, L, J modelsBlack color . U, C, R, A, B, G, L, E modelsTitan
25、ium color . R, B, G, L, E modelsAccessories / 付属品Indoor FM Antenna x 1AM Loop Antenna x 1Antenna Adapter x 1 (U, C models)75-ohm/300-ohm antenna adapter x 1 (B model)Audio Pin Cable256.6(10-1/8)13.4 (1/2)70(2-3/4)16(5/8)271(10-11/16)86(3-3/8)435(17-1/18) DIMENSIONSSPECIFICATIONS / 参考仕様* Specificatio
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