Yamaha-GX-505-505-VCD-Service-Manual电路原理图.pdf

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1、GX-505/GX-505VCD GX-505/VCD 100714 SERVICE MANUAL GX-505 GX-505VCD 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-505 PANELS . 34 GX-505VCD 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 . 3860 PIN CONNECTION DIAGRAM .61 SCHEMATIC DIAGRAM . 6269 PARTS LIST . 70102 GX-505 REMOTE CONTROL TRANSMITTER .103 GX-505VCD RE

9、MOTE CONTROL TRANSMITTER .104 GX-505 is composed of GX-505 (main unit) and NX-GX505s (speakers). GX-505VCD is composed of GX-505VCD (main unit) and NX-GX505s (speakers). RadioFans.CN 收音机爱 好者资料库 GX-505/GX-505VCD GX-505/VCD ITO SERVICE PERSONNEL 1. Critical Components Information. Components having sp

10、ecial 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, it is imperative to verify that all exposed conductive surfaces are properly insulated

11、 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. 1 AC LEAKAGE TESTER OR EQUIVALENT EQUIPMENT UNDER TEST INSULATING TABLE WALL OUTLET “CAUTION” “F201 : F

12、OR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 2.0A, 125V FUSE.” “F202 : FOR CONTINUED PROTECTION 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. ATTEN

13、TION 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: Laser Safety This product contains a laser beam component. This component may emit invisible, as well as visible radiation, which may cause eye damage.

14、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 repairing 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

15、 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 : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. WARNING: CHEMICAL

16、 CONTENT NOTICE! The solder used in the production of this product 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

17、 and/or birth defects or other reproductive harm. DO NOT PLACE 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 vapo

18、r! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food. RadioFans.CN 收音机爱 好者资料库 GX-505/GX-505VCD GX-505/VCD 2 B, G, R, L, T models B, G, R, L, T models Laser Emitting conditions: 1) When the Top Cover is removed, and the

19、 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 the lens of the laser pick-up unit. Do not attempt any servicing during this period! If no disc is detected, t

20、he 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, this level has been set by the factory prior to shipping from the factory. Do not adjust this laser level contro

21、l 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 Wavelength: 780 nm Emission duration: Continuous Laser output: Max. 44.6W* ANSI Class: Class 1 * This output is the val

22、ue 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-STEILYLLE. L KATSO STEESEEN. VARNING! : OSYNLIG LASERSTRLNING NR DENNA DEL R PPNAD OCH SPRREN R URKOPPLAD. BETRAKTA E

23、J STRLEN. Variable resistor (Do not turn) Optical pick-up GX-505/GX-505VCD GX-505/VCD IGX-505 PANELS M B, G models M U, C, R, A models 3 GX-505/GX-505VCD GX-505/VCD M A model M U, C models M R model M B, G models 4 GX-505/GX-505VCD GX-505/VCD M R, T modelsM L model IGX-505VCD PANELS 5 GX-505/GX-505V

24、CD GX-505/VCD ISPECIFICATIONS I AMPLIFIER SECTION Minimum RMS Output Power per Channel 1kHz, 0.9% THD, 6 . 80W + 80W 1kHz, 10% THD, 6 . 100W + 100W Input Sensitivity/Impedance AUX/MD .200mV/47k Spectrum Analyzed Band . 5 band (100Hz, 350Hz, 1kHz, 3.5kHz, 10kHz) I VIDEO SECTION (GX-505VCD only) Signa

25、l Level . 1Vp-p/75 I TUNER 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 model .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 Us

26、able Sensitivity (75) 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 I CD 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-ti

27、me oversampling digital filter 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 me

28、chanical unit and investigate the cause of the failure. 18 GX-505/GX-505VCD GX-505/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)

29、 Load a disc in “DISC 1”. 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 s

30、ervo ON VCO lock. Tracking 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, 1

31、1 pin) FOCUS BALANCE ADJ. FOCUS GAIN ADJ. TRACKING GAIN ADJ. 19 A GX-505/GX-505VCD GX-505/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

32、. Forced feed return. STOP : 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

33、, 26 pin) A GX-505/GX-505VCD GX-505/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 adjustmen

34、ts of mechanical system, 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

35、 GOscilloscope GFrequency 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 G

36、MTT-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 21 VR6 VR5 VR7 VR4 VR1 VR3 VR2 IC6 REC LEVEL ADJ. (Lch) REC LEVEL ADJ. (Rc

37、h) TAPE SPEED ADJ. PB LEVEL ADJ. (Lch) PB LEVEL ADJ. (Rch) BIAS ADJ. (Lch)BIAS ADJ. (Rch) GX-505/GX-505VCD GX-505/VCD “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

38、-60) MTT-114N 10kHz, 10dB MTT-111N 3kHz, 10dB MTT-111N 3kHz, 10dB Step 1 2 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

39、 be minimum both directions. (Fig. B) 3000Hz 15Hz Less than 0.19% (WRMS) Remarks 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 Oscillos

40、cope Frequency counter Wow/flutter meter Adjustment part Azimuth adjustment screw. (Fig. A) VR7 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) =

41、 7 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 T

42、est 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. (REVERSE) Azimuth adjustment screw. (FORWARD) GX-505/GX-505VCD GX-505/VCD Rating Adjust for equal record and playback levels. ( 27 dBV 0.3 dBV) Adjust for equal record and playback levels. ( 27 dBV 0.3 dBV) Adjust for equal record and playback levels. (Fig. D) Perf