Yamaha-RX-777-Service-Manual电路原理图.pdf
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1、SERVICE MANUAL STEREO RECEIVER RX-777 100749 IMPORTANT NOTICE 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
2、 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 personal injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons, w
3、e advise all YAMAHA product owners that any service 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 an
4、y applicable technical capabilities, or establish 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 pro
5、ducts. Modifications are, therefore, inevitable 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 stati
6、c electricity your body may have accumulated 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. RX-777 P.O.Box 1, Hamamatsu, Jap
7、an I CONTENTS TO SERVICE PERSONNEL . 1 IMPEDANCE SELECTOR . 1 REAR PANELS . 2 SPECIFICATIONS. 3 INTERNAL VIEW . 4 DISASSEMBLY PROCEDURES . 5 OPERATION P.C.B. CHECK. 5 AMP ADJUSTMENTS. 6 TEST MODE . 6 DISPLAY DATA . 8 IC DATA . 910 PRINTED CIRCUIT BOARD . 1122 BLOCK DIAGRAM. 2324 SCHEMATIC DIAGRAM .
8、2528 PARTS LIST . 2938 REMOTE CONTROL TRANSMITTER . 39 RX-777 RX-777 1 WALL OUTLET EQUIPMENT UNDER TEST AC LEAKAGE TESTER OR EQUIVALENT INSULATING TABLE WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or
9、 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
10、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
11、ng food. I TO SERVICE PERSONNEL 1. Critical Components Information Components having special characteristics are marked Z and must be replaced with parts having specifications equal to those originally installed. 2. Leakage Current Measurement (For 120V Models Only) When service has been completed,
12、it is imperative to verify that all exposed conductive surfaces are properly insulated from supply circuits. GMeter impedance should be equivalent to 1500 ohm shunted by 0.15F. GLeakage current must not exceed 0.5mA. GBe sure to test for leakage with the AC plug in both polarities. I IMPEDANCE SELEC
13、TOR IMPEDANCE SELECTOR WARNING: Do not change the IMPEDANCE SELECTOR switch setting while the power to this unit is on, otherwise this unit may be damaged. RX-777 RX-777 2 I REAR PANELS U model C model A model RX-777 RX-777 3 I SPECIFICATIONS I AUDIO SECTION Minimum RMS Output Power (Power Amp. Sect
14、ion) 8 ohms, 20 Hz to 20 kHz, 0.019% THD .100W + 100W 6 ohms, 20 Hz to 20 kHz, 0.03% THD .120W + 120W Dynamic Power Per Channel (IHF) 8/6/4/2 ohms . 140/170/220/290 W Power Band Width 8 ohms, 50W, 0.03% THD .10 Hz to 50 kHz Damping Factor 8 ohms, 20 Hz to 20 kHz, SPEAKER-A . 240 or more Input Sensit
15、ivity / Input Impedance PHONO MM . 2.5 mV / 47 k-ohms CD, etc. . 150 mV / 47 k-ohms MAIN IN . 1 V / 30 k-ohms Maximum Input Signal Level PHONO MM (1 kHz, 0.015% THD) . 115 mV CD, etc. (1 kHz, 0.015% THD) . 2.2 V Output Level / Output Impedance PRE OUT . 1 V / 1.2 k-ohms REC OUT (PHONO) . 150 mV / 1.
16、7 k-ohms Headphone Jack Rated Output / Impedance 0.015% THD, 8 ohms, 1 kHz, 150 mV . 0.47 V / 470 ohms Frequency Response CD, etc. (20 Hz to 20 kHz). 00.5 dB MAIN IN (20 Hz to 20 kHz) . 00.5 dB CD (CD DIRECT AMP ON, 20 Hz to 100 kHz) . 01.0 dB RIAA Equalization Deviation PHONO MM (20 Hz to 20 kHz) .
17、 0 0.5 dB Total Harmonic Distortion (20 Hz to 20 kHz) PHONO MM, to REC OUT (3 V) .0.008% or less CD, etc. to PRE OUT (1 V) .0.007% or less CD, etc. to SP OUT (50 W / 8 ohms) .0.012% or less Signal to Noise Ratio (IHF-A network) PHONO MM (5 mV Input shorted) .87 dB or more CD (CD DIRECT AMP ON, 150 m
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- Yamaha RX 777 Service Manual 电路 原理图
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