Yamaha-KMA-950-Service-Manual电路原理图.pdf

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1、KMA-1000/KMA-950 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 specifi cally YAMAHA Products, are already known and understood by the users, and have therefore

2、 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 specifi ed. For these reasons, we advise all YAMAHA product owners that an

3、y service required should be performed by an authorized YAMA- HA Retailer or the appointed service representative. IMPORTANT: The presentation or sale of this manual to any individual or fi rm does not constitute authorization, certifi cation or recognition of any applicable technical capabilities,

4、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 products. Modifi cations are, therefore,

5、 inevitable and specifi cations are subject to change without notice or obligation to retrofi t. 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

6、accumu- lated 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. IMPORTANT NOTICE 101140 SERVICE MANUAL CONFIRMATION OF IDLING

7、CURRENT OF AMP UNIT .14 IC DATA .1516 BLOCK DIAGRAM .17 PIN CONNECTION DIAGRAMS .18 PRINTED CIRCUIT BOARDS .1936 SCHEMATIC DIAGRAMS .3750 REPLACEMENT PARTS LIST .5163 REMOTE CONTROL .64 SETUP MODE .6567 CONTENTS TO SERVICE PERSONNEL .2 IMPEDANCE SELECTOR .3 FRONT PANELS .3 REAR PANELS .4 REMOTE CONT

8、ROL PANEL .5 SPECIFICATIONS .56 INTERNAL VIEW .6 DISASSEMBLY PROCEDURES .7 INDICATION OF PROTECTION INFORMATION .8 SELF-DIAGNOSTIC FUNCTION .913 Copyright 2009 YAMAHA CORPORATION. All rights reserved. This manual is copyrighted by YAMAHA and may not be copied or redistributed either in print or elec

9、tronically without permission. 09.05 DIGITAL KARAOKE MIXING AMPLIFIER KMA-1000/KMA-950 For T model RadioFans.CN 收音机爱 好者资料库 2 KMA-1000/KMA-950 KMA-1000/KMA-950 TO SERVICE PERSONNEL 1. Critical Components Information Components having special characteristics are marked Z and must be replaced with part

10、s having specifi cations 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 properly insulated from supply circuits. Meter impedance should be equivalent to 15

11、00 ohms shunt- ed by 0.15F. AC LEAKAGE TESTER OR EQUIVALENT EQUIPMENT UNDER TEST INSULATING TABLE WALL OUTLET WARNING: CHEMICAL CONTENT NOTICE! This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm. DO NOT PLACE SOLDER, ELECTRIC

12、AL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT SO EVER! Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or ex- pose eyes to solder/fl ux vapor! If you come in contact with solder or components located inside the enc

13、losure of this product, wash your hands before handling food. Leakage current must not exceed 0.5mA. Be sure to test for leakage with the AC plug in both polarities. About Lead Free Solder All of the P.C.B.s installed in this unit and solder joints are soldered using the lead free solder. Among some

14、 types of lead free solder 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 4

15、0C (50F to 70F) higher than that of the lead solder, be sure to use a soldering iron suitable to each solder. “CAUTION” “F401: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 2.5A, 250V FUSE.” “F402: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYP

16、E 4A, 250V FUSE.” A V WARNING: Lithium batteries CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type. WARNING: Lithium batteries are dangerous because they can be exploded by improper handling. Observe the following precautions when handling

17、or replacing lithium batteries. Leave lithium battery replacement to qualifi ed service personnel. Always replace with batteries of the same type. When installing on the PC board by soldering, solder using the connection terminals provided on the battery cells. Never solder directly to the cells. Pe

18、rform the sol- dering as quickly as possible. Never reverse the battery polarities when installing. Do not short the batteries. Do not attempt to recharge these batteries. Do not disassemble the batteries. Never heat batteries or throw them into fi re. ADVARSEL! Lithiumbatteri Eksplosionsfare ved fe

19、jlagtig hndtering. Udskiftning m kun ske med batteri af samme fabrikat og type. Levr det brugte batteri tilbage til leverandren. VARNING Explosionsfara vid felaktigt batteribyte. Anvnd samma batterityp eller an ekvivalent typ som rekommenderas av apparattillverkaren. Kassera anvnt batteri enligt fab

20、rikan- tens instruktion. VAROITUS Paristo voi rjht, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. Hvit kytetty peristo valmistajan ohjeiden mu- kaisesti. RadioFans.CN 收音机爱 好者资料库 3 KMA-1000/KMA-950 KMA-1000/KMA-950 IMPEDANCE SELECTOR FRONT PAN

21、ELS KMA-1000 KMA-950 IMPEDANCE SELECTOR WARNING: Do not change the setting of the IMPEDANCE SELECTOR switch when the unit power is switched on, as doing so may damage the unit. KMA-1000 model 4 KMA-1000/KMA-950 KMA-1000/KMA-950 REAR PANELS KMA-1000 (T model) KMA-950 (T model) 5 KMA-1000/KMA-950 KMA-

22、1000/KMA-950 REMOTE CONTROL PANEL SPECIFICATIONS AMPLIFIER SECTION Minimum RMS Output Power L/R (1 kHz, 1% THD, 8-ohms) KMA-1000 160 W + 160 W KMA-950 120 W + 120 W Maximum Useful Output Power (JEITA) L/R (1 kHz, 10% THD, 8-ohms) KMA-1000 200 W + 200 W KMA-950 150 W + 150 W Damping Factor 20 Hz to 2

23、0 kHz, 8-ohms 60 or more Input Sensitivity/Input Impedance DVD etc. 200 mV/42 k-ohms Mic 6 mV/20 k-ohms Maximum Input Voltage DVD etc. 2.3 V or more Mic 60 mV or more Rated Output Voltage/Output Impedance Subwoofer 2.0 V/1.2 k-ohms Rec out 1.0 V/1.2 k-ohms Total Harmonic Distortion (20 Hz to 20 kHz)

24、 DVD etc. to SP OUT KMA-1000 (80 W/8-ohms) 0.1% or less KMA-950 (60 W/8-ohms) 0.1% or less Signal to Noise Rate (IHF-A Network) DVD etc., Input shorted (200 mV) 85 dB or more MIC, Input shorted (6 mV) 75 dB or more Residual Noise (IHF-A Network) 180 V or less Channel Separation (1 kHz) DVD etc., Inp

25、ut 5.1 k-ohms shorted 55 dB or more Tone Control Characteristics MUSIC Bass boost/cut (100 Hz) 12 dB Treble boost/cut (10 kHz) 12 dB MIC Bass boost/cut (100 Hz) 12 dB Mid boost/cut (1 kHz) 12 dB Treble boost/cut (10 kHz) 10 dB Gain Tracking Error 2.0 dB or less GENERAL Power Supply AC220 V, 50 Hz Po

26、wer Consumption KMA-1000 200 W KMA-950 145 W AC Outlet 2 switched outlets 100 W max. total Dimensions (W x H x D) 435 x 150 x 430 mm (17-1/8 x 5-7/8 x 16-7/8) Weight KMA-1000 11.3 kg (24.9 lbs.) KMA-950 10.7 kg (23.6 lbs.) Finish Black color Accessories Remote control x 1 Lithium battery (CR2025) x

27、1 * Specifi cations are subject to change without notice due to prod- uct improvements. T .Chinese model 6 KMA-1000/KMA-950 KMA-1000/KMA-950 435 (17-1/8) 18 (5/8) 132 (5-1/4) 150 (5-7/8) 376 (14-3/4) 430 (16-7/8) 40 (1-5/8) 14 (1/2) DIMENSIONS Unit : mm (inch) INTERNAL VIEW q MAIN (5) P.C.B. w MAIN

28、(3) P.C.B. (KMA-1000) MAIN (4) P.C.B. (KMA-950) e OPERATION (1) P.C.B. r FUNCTION (3) P.C.B. t MAIN (1) P.C.B. y MAIN (2) P.C.B. u FUNCTION (1) P.C.B. i OPERATION (3) P.C.B. o OPERATION (2) P.C.B. !0 FUNCTION (2) P.C.B. !1 OPERATION (5) P.C.B. (KMA-1000) OPERATION (6) P.C.B. (KMA-950) !2 OPERATION (

29、4) P.C.B. Front view Top view ? ? ? 7 KMA-1000/KMA-950 KMA-1000/KMA-950 DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.) 1. Removal of Top Cover a. Remove 8 screws (q) and 2 screws (w). (Fig. 1) b. Slide the top cover rearward to remove it. (Fig. 1) 2. Removal of Front Panel Unit a. R

30、emove 4 screws (e) and 4 screws (r). (Fig. 1) b. Remove CB2, CB15 and CB562. (Fig. 1) c. Remove the front panel unit. (Fig. 1) Fig. 1 Fig. 2 3. Removal of OPERATION (1) P.C.B. a. Remove 6 (KMA-1000) / 3 (KMA-950) screws (t) and 2 nuts (y). (Fig. 2) b. Remove CB237. (Fig. 2) c. Remove the OPERATION (

31、1) P.C.B. (Fig. 2) Top cover ? ? ? CB2 CB15 CB562 ? ? ? Front panel unit ? ? ? ? ? ? ? CB237OPERATION (1) P.C.B. KMA-1000 model 8 KMA-1000/KMA-950 KMA-1000/KMA-950 INDICATION OF PROTECTION INFORMATION If any of indicators shown below fl ashes after turning on the power to this unit, it means that th

32、e protection func- tion is at work and normal operation is not available. Details of Protection Information a. DC protection Cause: Abnormal DC voltage of amplifi er output L/R Normal value: 0.312 to 2.327 V Detection port: PRD (58 pin of microprocessor IC15) Detected at: Amplifi er output L/Rch of

33、MAIN P.C.B. b. I protection Cause: Excess current fl ow into amplifi er Normal value: Low (0 V) Detection port: PRI (56 pin of microprocessor IC15) Detected at: Amplifi er output L/Rch of MAIN P.C.B. c. TH protection Cause: Abnormal temperature of heat sink. Normal value: 0.3 to 1.4 V Detection port

34、: TH_R (57 pin of microprocessor IC15) Detected at: Heat sink temperature detection IC401 of MAIN P.C.B. MUSIC indicator flashing: DC protectionMIC indicator flashing: TH protection ECHO indicator flashing: I protection KEY CONTROL indicator flashing in red/green alternately 9 KMA-1000/KMA-950 KMA-1

35、000/KMA-950 This unit has self-diagnostic functions that are intended for inspection, measurement and location of faulty point. There are 10 main menu items, each of which has sub-menu items. Listed in the table below are main menu items and sub-menu items. SELF-DIAGNOSTIC FUNCTION No.Main menuSub-m

36、enu 1FIRMWARE VERSION aFirmware Version #1 bFirmware Version #2 2TEMPERATURE of HEAT SINK aMonitor bMaximum cMinimum 3TEMPERATURE of POWER TRANSFORMER aMonitor bMaximum cMinimum 4DC VOLTAGEaDC Voltage 5PROTECTION HISTORY aHistory 1 bHistory 2 cHistory 3 6CHECKSUM aUpper bit bLower bit 7ANALOG CHECK

37、aDVD bAUX (KMA-1000) / TAPE (KMA-950) cTAPE (KMA-1000) / BGM (KMA-950) dBGM (KMA-1000) / (KMA-950) 8KP MUSIC CHECK aDVD bAUX (KMA-1000) / TAPE (KMA-950) cTAPE (KMA-1000) / BGM (KMA-950) dBGM (KMA-1000) / (KMA-950) 9KP MIC CHECK aL ch bR ch 10INDICATOR CHECK aAll Light up bAll Off cAutomatic Sequenti

38、al Lighting 11INPUT MODE aDVD bAUX (KMA-1000) / TAPE (KMA-950) cTAPE (KMA-1000) / BGM (KMA-950) dBGM (KMA-1000) / (KMA-950) 12KP DELAY CHECK aDVD bAUX (KMA-1000) / TAPE (KMA-950) cTAPE (KMA-1000) / BGM (KMA-950) dBGM (KMA-1000) / (KMA-950) 10 KMA-1000/KMA-950 KMA-1000/KMA-950 Starting Self-Diagnosti

39、c Function While pressing the “INPUT” key of this unit, press the “POWER” switch to turn ON the power. “INPUT” key“POWER” switch Canceling Self-Diagnostic Function Press the “POWER” switch of this unit to turn OFF the power. Operation Procedure of Main menu and Sub-menu There are 12 main menu items,

40、 each of them having sub-menu items. Main menu selection Select the main menu using “KEY CONTROL” knob. Sub-menu selection Select the sub-menu using “INPUT” key. Main menu indicator (lit in red) Sub-menu indicator Main menu No.KEY CONTROL indicators 1 ? 2+ 1 3+ 2 4+ 3 5+ 4 6+ 5 7- 1 8- 2 9- 3 10- 4

41、11- 5 12- 5, - 4 Sub-menu Code INPUT indicators KMA-1000KMA-950 aDVDDVD bAUXTAPE cTAPEBGM dBGM 11 KMA-1000/KMA-950 KMA-1000/KMA-950 Details of Self-Diagnostic Function menu 1. FIRMWARE VERSION The fi rmware version is indicated. a. Firmware Version #1: Firmware free area b. Firmware Version #2: Firm

42、ware fi xed area 2. TEMPERATURE of HEAT SINK The temperature of heat sink is indicated. a. Monitor: Current temperature b. Maximum: Highest value c. Minimum: Lowest value 4. DC VOLTAGE The DC voltage of amplifi er output L/R is indicated. 5. PROTECTION HISTORY The 3 protection histories are indicate

43、d. 0. No protection 1. DC protection 2. I protection 3. TH protection Version: 1 . 0 0 + 0 2 6 Voltage: 0 . 0 0V History 1 (Latest)History 2History 3 (+: Off, -: Lit (Amber) + 0 2 6 (+: Off, -: Lit (Amber) 3. TEMPERATURE of POWER TRANSFORMER The temperature of power transformer is indicated. a. Moni

44、tor: Current temperature b. Maximum: Highest value c. Minimum: Lowest value 12 KMA-1000/KMA-950 KMA-1000/KMA-950 6. CHECKSUM The checksum value is indicated in the decimal number. a. Upper bit b. Lower bit Music Vocal A/D A/D Gm_L Gm_R Gv D/A D/A ANALOG CHECK through ANALOG CHECK through SW Through

45、KP VR Music VR Mic KP KEY CONTROL Volume INPUTGm_LGm_RGvSW MUSICECHOMIC ANALOG CHECK ? Active (Min) Min Active (Min) Active (DVD) through KP MUSIC CHECK ? 0 dB Active (Min) Active (DVD) 0 dBoff KP MIC CHECK L ch ? Active (Min) Min off0 dB KP KP MIC CHECK R ch ? Active (Min) Min off 0 dB KP Fig. 3 IN

46、PUT selectL ch: 0 to 4, R ch: 6 to 10 “ECHO MODE” key Upper bit 0 5 4 (decimal number) ? 3 9 (Hexadecimal) Lower bit 1 6 9 (decimal number) ? 8 6 (Hexadecimal) Checksum value: 3 9 8 6 7. ANALOG CHECK The signal passage is checked. (Fig. 3) INPUT select: DVD, AUX (KMA-1000 model), TAPE, BGM MUTE ON/OFF: ECHO MODE key (ON: Lit (amber), OFF: Off) 8. KP (Karaoke processor) MUSIC CHECK The signal passage is checked. (Fig. 3) INPUT select: DVD, AUX (KMA-1000 model), TAPE, BGM 9. KP (Karaoke processor) MIC CHECK The signal