Yamaha-NXA-01-Service-Manual电路原理图.pdf

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1、P.O.Box 1, Hamamatsu, Japan NX-A01 TROUBLESHOOTING. 6 IC DATA . 710 BLOCK DIAGRAM. 11 PRINTED CIRCUIT BOARDS. 1213 PIN CONNECTION DIAGRAMS. 14 SCHEMATIC DIAGRAMS. 1516 REPLACEMENT PARTS LIST . 1721 101029 I CONTENTS TO SERVICE PERSONNEL . 2 FRONT PANELS . 3 REAR PANELS . 3 SPECIFICATIONS . 3 INTERNA

2、L VIEW . 4 About the Status Indicator (LED). 4 DISASSEMBLY PROCEDURES . 45 SERVICE MANUAL SPEAKER SYSTEM NX-A01 06.08 2006 All rights reserved. This manual is copyrighted by YAMAHA and may not be copied or redistributed either in print or electronically without permission. IMPORTANT NOTICE This manu

3、al 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 not been restated. WARNING

4、:Failure to follow appropriate service and safety procedures when servicing this product may result in per- 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 b

5、e 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, certifica- tion or recognition of any applicable technical capabilities, or establish a principle-agent

6、 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 and specifications

7、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 grounding yourself

8、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. RadioFans.CN 收音机爱 好者资料库 NX-A01 2 NX-A01 I TO SERVICE PERSONNEL 1. Critical Components Information C

9、omponents having special characteristics are marked s 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, it is imperative to verify that all exposed conductive surfaces are

10、properly insulated from supply circuits. GMeter impedance should be equivalent to 1500 ohms shunted by 0.15F. GLeakage current must not exceed 0.5mA. GBe sure to test for leakage with the AC plug in both polarities. WALL OUTLET EQUIPMENT UNDER TEST AC LEAKAGE TESTER OR EQUIVALENT INSULATING TABLE WA

11、RNING: CHEMICAL CONTENT NOTICE! The solder used in the manufacturing process except soldering of the P.C.B. assy 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 Agenc

12、y (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 WHATSOEVER! Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhal

13、e 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 handling food. All of the P.C.B.s installed in this unit are soldered using the lead free solder. Among some types of lead free so

14、lder currently available, it is 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: As the melting point temperature of the lead free solder is about 30C to 40C (50F to 70F) higher

15、 than that of the lead solder, be sure to use a soldering iron suitable to each solder. About Lead Free Solder RadioFans.CN 收音机爱 好者资料库 NX-A01 3 NX-A01 I FRONT PANELS I REAR PANELS Front view Top view Side view Bottom view Rear view Type.1 box opposed stereo type Dynamic Power (1 kHz, 8 ohms, 10% T.H

16、.D.) . 4 W x 2 Input Sensitivity . 200 mV/33 k-ohms PORTABLE IN Frequency Response . 90 Hz to 20 kHz Drivers .3 cm (1-3/16) titanium diaphragm full range x 2 Input Jack .3.5 mm mini jack (PORTABLE IN) Maximum Permissible Input. 2.0 V Power Supply . 100-240 V AC, 50/60 Hz Power Consumption. 8 W Stand

17、by Power Consumption C model . 0.6 W T, G, L models. 0.7 W Dimensions (W x H x D) . 84 x 89 x 84 mm (3-5/16 x 3-1/2 x 3-5/16) Weight . 310 g (11 oz.) Finish .White color Accessories. AC adaptor x 1 3.5 mm mini jack cable x 1 *Specifications are subject to change without notice due to product improve

18、ments. C . Canadian modelT. Chinese model G . European modelL . Singapore model I SPECIFICATIONS DIMENSIONS Unit: mm (inch) 89 (3-1/2) 84 (3-5/16)84 (3-5/16) (C model)(G model)(T model)(L model) NX-A01 4 NX-A01 After disassembling the unit or replacing any part, be sure to input a signal (20 Hz to 2

19、0 kHz) from the PORTABLE IN terminal to make sure that the unit is free from chattering or abnormal sound. When replacing the MAIN (2) P.C.B. and button assembly, be sure to use the button support jig for installation of the button assembly. The sheet window once removed cannot be reused. Be sure to

20、 use a new sheet window for replacement. 1. Removal of MAIN(1) P.C.B. a. Remove 2 sheet window. (Fig. 1) b. Remove 4 screws (1), and then remove MAIN (2) P.C.B. together with bottom case. (Fig. 1) c. Remove CB302 and CB303. (Fig. 1) 2. Removal of MAIN (2) P.C.B. a. Remove SPBOX ASSY. (Fig. 1) b. Rem

21、one 4 screws (2), and then remove MAIN (2) P.C.B. (Fig. 2) Fig. 1Fig. 2 CB303 CB302 SPBOX Assy Case Bottom Case Sheet Window Sheet Window 1 1 MAIN (1) P.C.B. MAIN (2) P.C.B.Case 2 2 I About the Status Indicator (LED) The status indicator turns on or flashes to indicate the sta- tus of this unit. Thi

22、s unit is on. This unit is in the standby mode, or discon- nected from the AC adaptor. This unit is muted. The protection circuitry has been activated. (Disconnect the AC adaptor and wait for a while.) On Off Flashing (every second) Flashing (rapidly) 1 2 3 4 Status indicator (LED) MAIN (2) P.C.B. S

23、PBOX assy MAIN (1) P.C.B. 1 2 3 4 The current status of this unitLED status I INTERNAL VIEW I DISASSEMBLY PROCEDURES NX-A01 5 NX-A01 Fig. 5Fig. 6 Precautions when replacing the MAIN (2) P.C.B. and button assembly a. Install the cushion to the button assembly. (Fig. 5) b. Place the button support jig

24、 on the MAIN (2) P.C.B. by aligning positions of its 4 dowels. (Fig. 5) c. Install the button assembly by setting it to the center of the button support jig. (Fig. 6) Fig. 3Fig. 4 Support P.C.B. Dowel Support P.C.B. Wind the tape 3 turns. Making Button Support Jig *Prepare a support P.C.B. (Ref No.

25、16: Part No. WG593900). a. Using dowels together, install the support P.C.B. into its 4 installation holes. (Fig. 3) b. Wind the tape around 3 times at 4 places of the support P.C.B. (Fig. 4) MAIN (2) P.C.B. Dowel Dowel Button Assy Cushion Button Support Jig MAIN (2) P.C.B. Button Assy Button Suppor

26、t Jig NX-A01 6 NX-A01 I TROUBLESHOOTING Check the cable connections Reconnect cables and check again Check the fault in the power supply section (1) +12V and +12VA for system is OK? (2) +5V for system is OK? Trouble of microproce- ssor (IC501) or LEDs (D506, 509-511) circuit in MAIN (2) P.C.B. Good

27、condition Check the power supply Does status indicator light when STANDBY/ON key is pressed? Step 1 OK NG NG NO OK YES Step 2 Step 3 When the status indicator does not light even when STANDBY/ON key is pressed When no sound is produced Check the cable connections Reconnect cables and check again Con

28、nect CB302 in MAIN (1) P.C.B. to CB502 in MAIN (2) P.C.B. is OK? Trouble of audio circuit (IC301 and peripheral cir- cuit) in MAIN (1) P.C.B. Trouble of amplifier circuit (IC304 and peripheral cir- cuit) in MAIN (1) P.C.B. Trouble of microprocessor (IC501) circuit in MAIN (2) P.C.B. Good condition I

29、s the sound produced? Check the power when the power is turned on. Step 1 OK NG NG NO OK YES Step 2 Step 3 (1) +12V and +12VA for system is OK? (2) +VA and +5V for system is OK? Check the fault in the power supply section Trouble of microprocessor (IC501) circuit in MAIN (2) P.C.B. Check microproces

30、sor (IC501) clock Microprocessor (IC501) may work well Xtal (XL501) defective Trouble of RESET circuit (Q501 and peripheral cir- cuit) 14 and 15 pins of microprocessor (IC501) is OK? 18 pin of microprocessor (IC501) is OK? Step 1 OK NG NG OK Step 2 Check the RESET signal NX-A01 7 NX-A01 IC301: LC753

31、48M (MAIN (1) P.C.B.) Analog IC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 DI CE VSS TEST LOUT LBASS2 LBASS1 LTRE LIN LSEL0 L4 L3 L2 L1 NC NC R1 R2 R3 R4 RSEL0 RIN RTRE RBASS1 RBASS2 ROUT TIM Vref VDD CL Serial data and clock input terminal for control. Chip ena

32、ble terminal. / Data is written in the inside latch when H changes to L and each analog switch operates. / Data transfer is enabled at H level. Ground terminal. Test terminal of electronic volume. / Set to VSS potential. Volume + equalizer output terminal. Connection terminal for capacitor and resis

33、tor constructing bus band filter. Connection terminal for capacitor and resistor constructing bus band filter. Connection terminal for capacitor constructing treble band filter. Volume + equalizer input terminal. Input selector output terminal. Input signal terminal. Input signal terminal. Input sig

34、nal terminal. Input signal terminal. Set no connect terminal/open or connect to VSS. Set no connect terminal/open or connect to VSS. Input signal terminal. Input signal terminal. Input signal terminal. Input signal terminal. Input selector output terminal. Volume + equalizer input terminal. Connecti

35、on terminal for capacitor constructing treble band filter. Connection terminal for capacitor and resistor constructing bus band filter. Connection terminal for capacitor and resistor constructing bus band filter. Volume + equalizer output terminal. When there is no zero cross signal until the timer

36、is completed even after setting the timer terminal/data when there is no signal of the zero cross circuit, the data is forced to be set. Connect a capacitor of about some 10uF between Vref to VSS (VSS) as a measure against power ripple where 1/2 VDD voltage for analog ground occurs. Power voltage te

37、rminal. Serial data and clock input terminal for control. No.Pin nameDescription TEST VSS CE DI CL VDD Vref RVref LVref CCB INTERFACE ZERO CROSSDETMULTIPLEXER MULTIPLEXER LOGIC CIRCUIT CONTROL CIRCUIT ZERO CROSSDET NO SIGNAL TIMER TIM LOUT 5 6 7 8 9 10 11121314151617181920 21 22 23 24 25 26 27282930

38、1234 ROUT LBASS2 LBASS1 LTRE LIN LSELO L4 L3 L2 L1 R1 NC NC R2 R3 R4 RSELO RIN RTRE RBASS1 RBASS2 I IC DATA NX-A01 8 NX-A01 IC304: YDA138-EZE2 (MAIN (1) P.C.B.) Digital amplifier IC Thermal 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

39、 41 42 HPOR AVSS VSSBGR VREFR INR MUTEN PVDDPR OUTPR PVSSR PVSSR PVSSR PVSSR PVSSR OUTMR PVDDMR PROTN SLEEPN DVSS CKIO XO XI DVDD MODE0 MODE1 MODE2 VOL0 VOL1 PVDDML OUTML PVSSL PVSSL PVSSL PVSSL PVSSL OUTPL PVDDPL HP INL VREFL PVDDREG REFA HPOL O Pow Pow O I I Pow O Pow Pow Pow Pow Pow O Pow O I Pow

40、 I/O O I I I I I I I Pow O Pow Pow Pow Pow Pow O Pow I I O Pow O O R-ch headphone output terminal. 5V analog ground terminal. Ground terminal for reference voltage source. R-ch reference voltage terminal. (capacitor connected externally) R-ch analog signal input terminal. Mute control terminal. R-ch

41、 12V type VDD terminal. R-ch positive side output terminal. R-ch 12V type VSS terminal. R-ch 12V type VSS terminal. R-ch 12V type VSS terminal. R-ch 12V type VSS terminal. R-ch 12V type VSS terminal. R-ch negative side output terminal. R-ch 12V type VDD terminal. Warning signal output terminal. (O/D

42、) Sleep control terminal. Digital ground terminal. Clock input/output terminal. CERALOCK connection terminal. *1 CERALOCK connection terminal. *1 Digital ground termibnal. (connected to REFA terminal externally) Operation mode select terminal. Operation mode select terminal. Operation mode select te

43、rminal. Input sensitivity setting terminal. Input sensitivity setting terminal. L-ch 12V type VDD terminal. L-ch negative side output terminal. L-ch 12V type VSS terminal. L-ch 12V type VSS terminal. L-ch 12V type VSS terminal. L-ch 12V type VSS terminal. L-ch 12V type VSS terminal. L-ch positive si

44、de output terminal. L-ch 12V type VDD terminal. Headphone control terminal. L-ch analog signal input terminal. L-ch reference voltage terminal. (capacitor connected externally) 12V type PVDD terminal for regulator circuit. 5V regulator output terminal. (capacitor connected externally) L-ch headphone

45、 output terminal. No.Terminal NameI/OFunction I/OI: Input terminal, O: Output terminal, I/O: Input/output terminal, Pow: Power terminal * 1CERALOCK is a registered trade mark of Murata Mfg. Co., Ltd. NX-A01 9 NX-A01 IC501: PD789022GB-A70-8ES-A (MAIN (2) P.C.B.) Microprocessor 8-bit timer event/counter 00 78K/0S CPU core ROM 4 KB RAM 256 bytes Port 0 Port 1 Port 2 Port 3 Port 4 Port 5 P00 to P07 P20 to P22 P30 to P32 P40 to P47 P50 to P53 RESET X1 X2 IC VDD0 VDD1 VSS0 VSS1 P10 to P17 Ser