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1、GX-700/GX-700VCD GX-700/VCD 100673 SERVICE MANUAL GX-700 GX-700VCD MINI COMPONENT SYSTEM 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 specifi
2、cally 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 personal injury, destruction of expensive components, and failure of the product t
3、o 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 presentation or sale of this manual to any individual or firm does not constitute autho
4、rization, certifica- tion or recognition of any 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
5、are continually striving to improve YAMAHA products. 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 des
6、troy expensive components. Discharge any static 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
7、 to the unit. ICONTENTS TO SERVICE PERSONNEL .12 GX-700 PANELS .34 GX-700VCD PANELS .5 SPECIFICATIONS .6 INTERNAL VIEW .7 DISASSEMBLY PROCEDURES .812 VOLUME RANGE .13 SYSTEM CONTROL CHECK .13 TEST MODE .14 SYSTEM TEST MODE.14 RECEIVER TEST MODE .1516 TAPE TEST MODE .16 CD TEST MODE .17 ALL FUNCTION
8、TEST MODE.18 CD ERROR MESSAGES .18 CD STANDARD OPERATION CHART .1922 ADJUSTMENTS .2325 IC DATA .2632 DISPLAY DATA .3334 BLOCK DIAGRAM .3539 PRINTED CIRCUIT BOARD .4064 PIN CONNECTION DIAGRAM .65 SCHEMATIC DIAGRAM .6674 PARTS LIST .75110 GREASE APPLICATION DIAGRAM.111112 GX-700 REMOTE CONTROL TRANSMI
9、TTER .113 GX-700VCD REMOTE CONTROL TRANSMITTER .114 NX-GX500.115 、認定再生紙使用。 This Service Manual uses recycled paper. GX-700 is composed of GX-700, NX-GX500, NXC700 and NX-E700. GX-700VCD is composed of GX-700VCD, NX-GX500, NXC700 and NX-E700. NX-C700 requires replacement as a unit. NX-E700 requires r
10、eplacement as a unit. RadioFans.CN 收音机爱 好者资料库 GX-700/GX-700VCD GX-700/VCD ITO SERVICE PERSONNEL 1. Critical Components Information. Components having special characteristics are marked and must be replaced with parts having specifications equal to those originally installed. 2. Leakage Current Measu
11、rement (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. GMeter impedance should be equivalent to 1500 ohm shunted by 0.15F. PROTECTION OF EYES FROM LASER BEAM DURING SERVICING This se
12、t employs a laser. Therefore, be sure to carefully follow the instructions below when servicing . 1. Laser Diode Properties GMaterial: GaAlAs GWavelength: 780 nm GEmission Duration : Continuous GLaser Output: max. 44.6 W* * This output is the value measured at a distance of about 200 mm from the obj
13、ective lens surface on the Optical Pick-up Block. 2. When checking the laser diode emission, keep your eyes more than 30 cm away from the objective lens. CAUTION : USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE
14、. THE COMPACT DISC PLAYER SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONE EXCEPT PROPERLY QUALIFIED SERVICE PERSONNEL. GLeakage current must not exceed 0.5mA. GBe sure to test for leakage with the AC plug in both polarities. WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this pr
15、oduct 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 cancer and/or birth defects or other reproductive harm. DO NOT PLAC
16、E SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON 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 i
17、nside the enclosure of this product, wash your hands before handling food. 1 AC LEAKAGE TESTER OR EQUIVALENT EQUIPMENT UNDER TEST INSULATING TABLE WALL OUTLET “CAUTION” “F201 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 2.0A, 125V FUSE.” “F202 : FOR CONTINUED PROTECTI
18、ON AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 4.0A, 125V FUSE.” CAUTION F201 : REPLACE WITH SAME TYPE 2.0A, 125V FUSE. F202 : REPLACE WITH SAME TYPE 4.0A, 125V FUSE. ATTENTION F201 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 2.0A, 125V. F202 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYP
19、E DE 4.0A, 125V. RadioFans.CN 收音机爱 好者资料库 GX-700/GX-700VCD GX-700/VCD English THIS PRINTING (SEE POSITION SHOWN IN THE ILLUSTRATION) INFORMS THE USER THAT THE APPARATUS CONTAINS A LASER COMPONENT. THIS LABEL (SEE POSITION SHOWN IN THE ILLUSTRATION) WARNS THAT ANY FURTHER PROCEDURE WILL BRING THE USER
20、 INTO EXPOSURE WITH THE LASER BEAM. CAUTION : USE OF CONTROLS, ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN, MAY RESULT IN HAZARDOUS RADIATION EXPOSURE. Swedish DENNA MRKNING (SE FIGUR) UPPLYSER OM ATT DET I APPARATEN INGR EN LASERKOMPONENT AV TYP KLASS 1. VARNINGSMRKNI
21、NG (SE FIGUR) FR STRLNING. INGREPP I APPARATEN BR ENDAST FRETAGAS AV FACKMAN MED KNNEDOM OM LASER. APPARATEN INNEHLLER EN LASERKOMPONENT SOM AVGER STRLNING VERSTIGANDE GRNSEN FR LASERKLASS 1. VARNING : OSYNLIG LASERSTRLNING NR DENNA DEL R PPNAD: BETRAKTA EJ STRLEN. Danish DETTE MRKAT ER ANBRAGT SOM
22、VIST I ILLUSTRATIONEN FOR AT ADVARE BRUGEREN OM AT AP- PARATET INDEHOLDER EN LASERKOMPONENT. DETTE MRKAT OM LASEREN ER ANBRAGT P APPARATET SOM EN OPLYSNING OM AT APPARATET INDEHOLDER ET LASERKOMPONENT. ADVARSEL : INDGREB BOR KUN FORETAGES AF EN FAGMAND DA DER ER RISIKO FOR RADIOAKTIV STRLING. ADVARS
23、EL : USYNLIG LASERSTRLING VED BNING. UNDG UDSAETTELSE FOR STRLING. Finnish VARO! : AVATTAESSA OLET ALTTIINA NKYMTTMLLE LASERSTEILYLLE. L KATSO STEESEEN. 2 q B, G, R, L, T modelsw B, G, R, L, T models RadioFans.CN 收音机爱 好者资料库 GX-700/GX-700VCD GX-700/VCD IGX-700 PANELS M B, G models M U, C, R, A models
24、 3 343(13-1/2) 12 (1/2) 9 (3/8) 364(14-5/16) 100 (3-15/16) 172(6-3/4) 280(11) 320(12-5/8) 200(7-7/8) 320(12-5/8) 280(11-7/16) 113(4-7/16) 94(3-11/16) 117(4-5/8) GX-700/GX-700VCD GX-700/VCD M A model M U, C models M R model M B, G models 4 GX-700/GX-700VCD GX-700/VCD M R, T modelsM L model IGX-700VCD
25、 PANELS 5 200(7-7/8) 320(12-5/8) 280(11-7/16) 113(4-7/16) 94(3-11/16) 117(4-5/8) GX-700/GX-700VCD GX-700/VCD ISPECIFICATIONS IAMPLIFIER SECTION Minimum RMS Output Power per Channel FRONT, 1kHz, 0.9% THD, 6 .80W + 80W FRONT, 1kHz, 10% THD, 6 .100W + 100W CENTER, 1kHz, 0.9% THD, 6.80W CENTER, 1kHz, 10
26、% THD, 6.100W REAR, 1kHz, 0.9% THD, 6.25W REAR, 1kHz, 10% THD, 6.30W Input Sensitivity/Impedance AUX/MD . 200mV/47k Spectrum Analyzed Band .5 band (100Hz, 350Hz, 1kHz, 3.5kHz, 10kHz) IVIDEO SECTION (GX-700VCD only) Signal Level .1Vp-p/75 ITUNER SECTION FM Tuning Range U, C models . 87.5 to 107.9MHz
27、R, T models . 87.5 to 108.0MHz/87.50 to 108.00MHz A, B, G, L models . 87.50 to 108.00MHz AM Tuning Range U, C models . 530 to 1,710kHz R, T models .530 to 1,710kHz/531 to 1,611kHz A, B, G, L models . 531 to 1,611kHz FM Usable Sensitivity (75) 30dB S/N Quieting, Mono, 1kHz, 100% mod. R, U, C, L, T mo
28、dels .1.5V (14.8dBf) DIN Mono, S/N 26dB (A, B, G only) .1.8V ICD CHANGER SECTION Type . 3-Disc Carousel Auto-changer Signal Readout.Non-contact, 3-beam semi-conductor laser pick-up D/A Converter. 1bit DAC Filter .8-time oversampling digital filter Wow Possible symptoms are, the clamp does not move u
29、p or down, the table does not turn, mecha. sensor switch malfunctions, etc. The normal operation may be restored by tuning off the power once and then on again. If it does not work in this way, disas- semble the CD mechanical unit and investigate the cause of the failure. 18 GX-700/GX-700VCD GX-700/
30、VCD I CD STANDARD OPERATION CHART Press OPEN/CLOSE key. Forced feed return operation. Clamp down operation. Disc table reset. Tray open. Tracking Offset auto ADJ. (only POWER ON) Focus Offset auto ADJ. (only POWER ON) Load a disc in “DISC 1”. Press PLAY key or push the tray. Tray closed. Table rotat
31、e. Disc research. Disc mechanism unit clamped up. Feed inward switch research. Laser ON. Disc scan. FOCUS Gain rough ADJ. FOCUS Search operation. FOCUS LOCK servo ON. Spindle motor accelerated. TRACKING servo ON. Disc servo ON VCO lock. Tracking Gain rough ADJ. Tracking Balance ADJ. (only Tray OPEN/
32、CLOSE) “OPEN” appears in the TIME indicator. “TRV” signal is output until detection of LIMIT switch. DISC “1” is turned to DM clamp position. LDON = “H” (IC5, 40 pin) FLOCK = “H” “L” (IC11, 8 pin) TLOCK = “H” “L” (IC11, 11 pin) FOCUS BALANCE ADJ. FOCUS GAIN ADJ. TRACKING GAIN ADJ. 19 A GX-700/GX-700
33、VCD GX-700/VCD 20 * Data fetch cycle TRACK No. “1” is searched. PLAY Set to SEARCH by means of Y, T key. MUTE ON. TRACK search. After searching the beginning, MUTE is cancelled. PLAY MUTE ON. Spindle motor stop. Laser OFF. Forced feed return. STOP : MUTE = “L” “H”, “0:00” appears in the time indicat
34、or. (IC11, 64 pin) * TOC READ After searching the beginning, MUTE is cancelled. Press the STOP key. : MUTE = “H” “L” : MUTE = “L” “H”, “0:00” appears in the time indicator . : LDON = “H” “L” (IC5, 40 pin) : FLSW = “L” (IC11, 26 pin) A GX-700/GX-700VCD GX-700/VCD G CLOSE operationG HOME operation LOA
35、D MOTOR reverse rotate Start LOAD SW OFF ? NO YES TIMER 10ms LOAD SW ON ? NO YES LOAD MOTOR STOP END LOAD SW OFF ? NO YES LOAD MOTOR forward rotate TIMER 10ms LOAD SW ON ? NO YES G OPEN operation LOAD MOTOR reverse rotate Start UNLOAD SW OFF ? YES 10sec timer start LOAD MOTOR STOP END 10sec timer ti
36、me up ? NO YES LOAD MOTOR STOP ERROR NO TIMER 10ms UNLOAD SW OFF ? YES NO G DOWN operation LOAD MOTOR forward rotate Start DOWN SW ON ? YES 10sec timer start END 10sec timer time up ? NO YES LOAD MOTOR STOP ERROR NO TIMER 10ms DOWN SW ON ? YES NO LOAD MOTOR forward rotate Start LOAD SW ON ? YES 10se
37、c timer start LOAD MOTOR STOP END 10sec timer time up ? NO YES LOAD MOTOR STOP To OPEN operation NO TIMER 10ms LOAD SW ON ? YES NO 21 GX-700/GX-700VCD GX-700/VCD 22 G ROTARY TRAY initialization operation Start POSITION SW OFF ? YES ROTARY MOTOR forward rotate 10sec timer time up ? YES ROTARY MOTOR S
38、TOP ERROR NO 10sec timer start Timer 20ms POSITION SW OFF ? YES DISC NO. count STOP SW OFF ? YES DISC NO. 3 ? YES DISC NO. clear NO ROTARY MOTOR retard STOP SW ON ? NO YES ROTARY MOTOR STOP ROTARY MOTOR 32ms back pluse STOP SW ON ? YES Timer 60ms NO STOP SW ON ? YES NO Overrun count Overrun count =
39、3 ? YES NO ERROR Overrun count clear END NO NO 10sec timer time up ? 10sec timer time up ? YES POSITION SW ON ? Timer 20ms POSITION SW ON ? YES YES POSITION SW OFF ? NO NO YES YES NO NO NO NO GX-700/GX-700VCD GX-700/VCD IADJUSTMENTS (DECK SECTION ONLY) 1. Before adjustment GSince head magnetization,
40、 dust accumulations, etc. are likely to introduce error in the various character- istics, it is very important that the heads are properly demagnetized and cleaned. GMake adjustments of mechanical system, playback system and recording system in that order. GExcept for azimuth adjustment, adjust in t
41、he forward direction. GAdjust at TAPE TEST MODE. 2. Instruments required GAudio frequency oscillator GACVM or dual channel (ACVM) GDCVM GWow/flutter meter GOscilloscope GFrequency counter GTorque meter TW-2111A (TX911580) . Take up/back tension (FWD) TW-2121A (TX911570) . Take up/back tension (RVS)
42、CT-160L (TX911120) . FF/REW 3. Test tape required GMTT-111N (TX911650). Normal speed GMTT-114N (TX911680) . Azimuth GMTT-212N (TX911660) .Playback level GMTT-256 (TX911300). Playback frequency response (Normal) GMTT-356 (TX911310). Playback frequency response (CrO2) GReference tape Type I/Normal (LH). TDK AC225 (VU167200) Type II/High (CrO2) . TDK AC514 (VU167300) G Test point 23 VR6 VR5 VR7 VR4 VR1 VR3 VR2 IC6 REC LEVEL ADJ. (Lch) REC LEVEL ADJ. (Rch) TAPE SPEED ADJ. PB LEVEL ADJ. (Lch) PB LEVEL ADJ. (Rch) BIAS ADJ.(Lch) BIAS ADJ.(Rch) GX-700/GX-700VCD GX-700/VCD OK Rec out L : ch 1
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