Yamaha-GX-707-707-VCD-Service-Manual (1)电路原理图.pdf

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1、GX-707/GX-707VCD GX-707/VCD 100713 SERVICE MANUAL GX-707 GX-707VCD 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-707 PANELS . 34 GX-707VCD 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 FUNCT

8、ION TEST MODE.18 CD ERROR MESSAGES .18 CD STANDARD OPERATION CHART . 1920 ADJUSTMENTS . 2123 IC DATA . 2430 DISPLAY DATA . 3132 BLOCK DIAGRAM . 3337 PRINTED CIRCUIT BOARD . 3862 PIN CONNECTION DIAGRAM .63 SCHEMATIC DIAGRAM . 6472 PARTS LIST . 73108 GX-707 REMOTE CONTROL TRANSMITTER .109 GX-707VCD RE

9、MOTE CONTROL TRANSMITTER .110 GX-707 is composed of GX-707 (main unit) and NX-P707 (speakers). GX-707VCD is composed of GX-707VCD (main unit) and NX-P707 (speakers). NX-P707 is composed of NX-GX505, NX-C707 and NX-E707. The NX-C707 and NX-E707 loudspeakers are not field serviceable and must be repla

10、ced as complete units. RadioFans.CN 收音机爱 好者资料库 GX-707/GX-707VCD GX-707/VCD ITO 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 Me

11、asurement (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. GLeakage current must not exceed 0.5mA. GBe sure to test

12、 for leakage with the AC plug in both polarities. 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 PROTECTION AGAINST RISK OF FIRE,

13、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 TYPE DE 4.0A, 125V. WARNING:

14、 Laser Safety This product contains a laser beam component. This component may emit invisible, as well as visible radiation, which may cause eye damage. To protect your eyes and skin from laser radiation, the following precautions must be used during servicing of the unit. 1) When testing and/or rep

15、airing any component within the product, keep your eyes and skin more than 30 cm away from the laser pick-up unit at all times. Do not stare at the laser beam at any time. 2) Do not attempt readjustment, disassembly or repair of the laser pick-up, unless noted elsewhere in this manual. 3) CAUTION :

16、Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (where ap

17、plicable) 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 FOR ANY REASON WHA

18、TSOEVER! 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 handling food. RadioFans.C

19、N 收音机爱 好者资料库 GX-707/GX-707VCD GX-707/VCD 2 Laser Emitting conditions: 1) When the Top Cover is removed, and the STANDBY SW is turned to the ON position, the laser component will emit a beam for several seconds to detect if a disc is present. During this time (5-10 sec.) the laser may radiate through

20、 the lens of the laser pick-up unit. Do not attempt any servicing during this period! If no disc is detected, the laser will stop emitting the beam. When a disc is set, you will not be exposed to any laser emissions. 2) The laser power level can be adjusted with the VR on the pick-up PWB, however, t

21、his level has been set by the factory prior to shipping from the factory. Do not adjust this laser level control unless instruction is provided elsewhere in this manual. Adjustment of this control can increase the laser emission level from the device. Laser Diode Properties Material: GaAlAs Waveleng

22、th: 780 nm Emission duration: Continuous Laser output: Max. 44.6W* ANSI Class: Class 1 * This output is the value measured at a distance of about 200 mm from the objective lens surface on the Optical Pick- up Block. VARO!: AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA NKYMTTMLLE LASER-STEILY

23、LLE. L KATSO STEESEEN. VARNING! : OSYNLIG LASERSTRLNING NR DENNA DEL R PPNAD OCH SPRREN R URKOPPLAD. BETRAKTA EJ STRLEN. B, G, R, L, T models B, G, R, L, T models Variable resistor (Do not turn) Optical pick-up GX-707/GX-707VCD GX-707/VCD IGX-707 PANELS M B, G models M U, C, R, A models 3 GX-707/GX-

24、707VCD GX-707/VCD M A model M U, C models M R model M B, G models 4 GX-707/GX-707VCD GX-707/VCD M R, T modelsM L model IGX-707VCD PANELS 5 GX-707/GX-707VCD GX-707/VCD ISPECIFICATIONS IAMPLIFIER SECTION Minimum RMS Output Power per Channel FRONT, 1kHz, 0.9% THD, 6 .80W + 80W FRONT, 1kHz, 10% THD, 6 .

25、100W + 100W CENTER, 1kHz, 0.9% THD, 6.80W CENTER, 1kHz, 10% 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-707VCD only) Signal Level .1Vp-p/75 ITUN

26、ER SECTION FM Tuning Range U, C models . 87.5 to 107.9MHz 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)

27、 30dB S/N Quieting, Mono, 1kHz, 100% mod. R, U, C, L, T models .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 f

28、ilter Wow Possible symptoms are, the clamp does not move up 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 investi

29、gate the cause of the failure. 18 GX-707/GX-707VCD GX-707/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”.

30、 Press PLAY key or push the tray. Tray closed. Table rotate. Disc sensing. Disc mechanism unit clamped up. Feed inward switch sensing. 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. Trackin

31、g Gain rough ADJ. Tracking Balance ADJ. (only Tray OPEN/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” (IC8, 8 pin) TLOCK = “H” “L” (IC8, 11 pin) FOCUS BALANCE ADJ.

32、 FOCUS GAIN ADJ. TRACKING GAIN ADJ. 19 A GX-707/GX-707VCD GX-707/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. STO

33、P : MUTE = “L” “H”, “0:00” appears in the time indicator. (IC8, 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” (IC8, 26 pin) A GX-707/GX-707

34、VCD GX-707/VCD IADJUSTMENTS (DECK SECTION ONLY) 1. Before adjustment GSince head magnetization, 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,

35、playback system and recording system in that order. GExcept for azimuth adjustment, adjust in the forward direction. GAdjust using the TAPE TEST MODE (shown on page 16). 2. Instruments required GAudio frequency oscillator GACVM or dual channel (ACVM) GDCVM GWow/flutter meter GOscilloscope GFrequency

36、 counter GTorque meter TW-2111A (TX911580) . Take up/back tension (FWD) TW-2121A (TX911570) . Take up/back tension (RVS) 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). Playb

37、ack 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 21 VR6 VR5 VR7 VR4 VR1 VR3 VR2 IC6 REC LEVEL ADJ. (Lch) REC LEVEL ADJ. (Rch) TAPE SPEED ADJ. PB LEV

38、EL ADJ. (Lch) PB LEVEL ADJ. (Rch) BIAS ADJ. (Lch)BIAS ADJ. (Rch) GX-707/GX-707VCD GX-707/VCD OK Rec out L : ch 1 Rec out R : ch 2 DC input, X-Y (Resurge) mode NG Fig. B 0.2V 0.2V “ELECTRICAL ADJUSTMENT” GUse 560 mV (250 nwb/m) for 0 dB as the standard level of the unit. 0dB = 250 nwb/m (315 Hz) = 7

39、dBV (Rec out level) Item to be Adjusted Playback level (315Hz) Confirmation of playback frequency response Step 1 2 Rating 7 dBV 0.3 dBV Check that the 10kHz playback level is within 0 3 dB of the 1kHz playback level. (Fig. C) Adjustment parts VR4 (L ch) VR1 (R ch) Tape MTT-212N 315Hz, 250nwb/m Test

40、 tape for frequency check. 3180s + 120s (LH) (MTT-256) 3180s + 70s (CrO2) (MTT-356) Points of measurement REC OUT REC OUT Mode PLAY PLAY Instrument required ACVM ACVM Oscilloscope G PLAYBACK FREQUENCY RESPONSE 4dB 3.5dB 1k 3dB 3dB 3k10kHz3152505012.5kHz Fig. C Fig. A 22 Azimuth adjustment screw. (RE

41、VERSE) Azimuth adjustment screw. (FORWARD) “MECHANICAL ADJUSTMENT” Item to be Adjusted Check each torque Check FF, REW take up time Azimuth Tape Speed Wow/Flutter Tape CT-160L (FF, REW) TW-2111A (FWD) TW-2121A (RVS) AC-514 (C-60) MTT-114N 10kHz, 10dB MTT-111N 3kHz, 10dB MTT-111N 3kHz, 10dB Step 1 2

42、3 4 5 Mode FF REW PLAY FF REW PLAY PLAY PLAY Rating FF, REW torque : within 70160g/cm. Take up torque : 3060g/cm. Back tension : 1.56g/cm. 80 to 120 seconds. Playback output of L and R is maxi- mum and phase difference should be minimum both directions. (Fig. B) 3000Hz 15Hz Less than 0.19% (WRMS) Re

43、marks After the adjustment make sure to apply screw lock paint. Perform adjustment at the center of the test tape, if possible. Confirm at center of the test tape, if possi- ble. Instrument required Torque meter ACVM Oscilloscope Frequency counter Wow/flutter meter Adjustment part Azimuth adjustment screw. (Fig. A) VR7 GX-707/GX-707VCD GX-707/VCD Rating Adjust for equal record and playb