Yamaha-TX-396-L-Service-Manual电路原理图.pdf
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1、TX-396L SERVICE MANUAL AM/FM STEREO TUNER TX-396L 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, inevita
2、ble 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
3、 by 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. 100700 I CONTENTS TO SERVICE PERSONNEL . 1 SPECIFICATIONS. 1 INTERNAL VIEW .
4、 2 REAR PANELS . 2 DISASSEMBLY PROCEDURES . 2 ADJUSTMENTS . 37 COM DATA . 8 DISPLAY DATA . 9 BLOCK DIAGRAM. 1011 PRINTED CIRCUIT BOARD . 1213 SCHEMATIC DIAGRAM . 1415 PARTS LIST . 1621 This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel. It has been a
5、ssumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users, and have therefore not been restated. WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in per
6、sonal 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 service required should be performed by an authorized YAMAHA Retailer or the appointed service representative. IMPORTANT:The presenta
7、tion or sale of this manual to any individual or firm does not constitute authorization, certification or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form. IMPORTANT NOTICE TX-396L P.O.Box 1, Hamamatsu, Japan TX-396L 263.511.33.27016 27886
8、 435 WALL OUTLET EQUIPMENT UNDER TEST AC LEAKAGE TESTER OR EQUIVALENT INSULATING TABLE 1 I 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. WARNING: CH
9、EMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or plastic (where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause
10、 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 WHATSOEVER! Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/
11、flux vapor! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food. I SPECIFICATIONS I FM SECTION Tuning Range 87.50 to 108.00 MHz 50dB Quieting Sensitivity (IHF) Mono1.55 V(15.1 dBf) Stereo (1 kHz 100% MOD)21 V(37.7 dBf) U
12、sable Sensitivity (DIN) Mono (S/N 26 dB)0.9 V Stereo (S/N 46 dB)24 V Alternate Channel Selectivity Selectivity (two signals) 40 kHz Dev. 300 kHz 70 dB Signal to Noise Ratio (DIN-Weighted 40 kHz) Mono75 dB Stereo70 dB Harmonic Distortion 1 kHz Mono0.1 % Stereo0.2 % Stereo Separetion 1kHz (40 kHz Dev.
13、)50 dB Frequency Response 20 Hz to 15 kHz00.5 dB I MW SECTION Tuning Range 531 to 1611 kHz Usable Sensitivity200 V/m Signal to Noise Ratio50 dB Harmonic Distortion 1 kHz0.3 % I LW SECTION Tuning Range153 to 288 kHz Usable Sensitivity400 V/m Signal to Noise Ratio50 dB Harmonic Distortion 1 kHz0.3 % I
14、 AUDIO SECTION Output Level/Impedance (Fixed) FM 100 % MOD 1 kHz500 mV/2.2 k MW/LW 30 % MOD 1 kHz200 mV/2.2 k I GENERAL Power Supply AC230V, 50Hz Power Consumption7 W Dimensions (W x H x D)435 x 86 x 278mm Weight3.2 kg * Specifications subject to change without notice. DIMENSIONS MODEL COLOR Black a
15、nd Gold TX-396L 2 3456 1 2 I INTERNAL VIEW I REAR PANEL 1 Tuner P. C. B (1) 2 Front-end pack 3 Operation P. C. B. (2) 4 Tuner P. C. B. (2) 5 Operation P. C. B. (1) 6 Operation P. C. B. (3) I DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.) 1. Removal of Top Cover Remove 4 screws (1) a
16、nd 2 screws (2) in Fig. 1. 2. Removal of Front Panel a. Disconnect the connectors (CB3 anf CB4) in Fig. 1. b. Remove 2 plastic rivets (3) in Fig. 1. c. Remove 5 screws (4) in Fig. 1. d. Unhook at 2 place (5) in Fig. 1. TX-396L FM SG Oscilloscope ACVM DIST. M FM ANT L R OUT PUT GND FM dummy antenna T
17、uner P. C. B. FM SG Oscilloscope ACVM DIST. M FM ANT L R YLF-15 (LPF) OUT PUT GND FM dummy antenna Tuner P. C. B. SSG FM SG Oscilloscope ACVM DIST. M FM ANT L R OUT PUT GND FM dummy antenna Tuner P. C. B. oscillator FM SG DCVM FM ANT TP1 TP2 R51 GND FM dummy antenna Tuner P. C. B. oscillator 3 I ADJ
18、USTMENTS 1. Before Adjustment (1)With the power turned on, wait for 5 minutes before starting adjustment so that operation becomes stable. (2)Adjust the OSC coil and IFT with insulated screwdriver. (3)Set the TUNING MODE to AUTO. (4)Decibel abbreviations dB : Decibels above or below 1V Example : 0dB
19、 = 1 v, 60dB = 1 mV X dB = (X + 11.2) dBf When substituting 60 for X, 60 dB = 72.2 dBf 2. Measuring instrument abbreviations FM SG: FM signal generator SSG: Stereo signal generator AM SG: AM signal generator DIST. M: Distortion meter FC: Frequency counter ACVM: AC voltage meter DCVM: DC voltage mete
20、r Check that the voltage obtained across each test point and ground on the tuner circuit is as follows. Test pointsRating or Standard +5 V terminal+5.6 0.5 V -VP terminal-23.0 1.0 V CAUTION : Before setting to the TEST mode, write down the user preset memory content in the table as shown below. (Thi
21、s is because setting to the TEST mode will cause the memory content to be the factory preset memory content, i.e. all the user preset memory content will be erased.) Preset keysP1P2P3P4P5P6P7P8 A B C D E Turn on the POWER switch while pressing the A/B/C/D/ E and FM/AM(FM/MW/LW) keys simultaneously,
22、and the unit enters the TEST mode for the display check. After this, repeat (1) to (4). (1)All the segments on the display light up. (2)The model name, TX-396L is displayed. (3)The place of destination is displayed. (4)The COM-version is displayed. Pressing the P1 key will cause operation to start f
23、rom (1). Pressing any other key will cause the mode to return to the NORMAL mode. PresetP1P2P3P4P5P6P7P8 A, E87.5090.1095.1098.10108.0088.10106.10 108.00 B, D63010801440531161190013501404 C153171225270288180207252 1) Discriminator balance adjustment 2) Monaural distortion adjustment 3) Stereo distor
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