Yamaha-T80-tun-sm电路图 维修手册.pdf

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1、STEREO TUNER I(FRON+ PANEL HCONTENTS . TO SRVICE PERSONAL 1 . SPEClFICATlONS 1 . REARPANELS 2 . DISASSEMBLY PROCEDURES 3 . INTERNALVIEW 4 . . ADJUSTMENT . 4 19 BLOCKDIAGRAM . 10 PRINTED ClRGUlT BOARD . 11 13 WIRING DIAGRAM . 14. 15 SCHEMATIC DIAGRAM . 16. 17 EXPLODED VIEW . 18 PARTS LIST . 19 27 NIP

2、PON GAKKl CO., LTD . HAMAMATSU . JAPAN 1 I W - q Q l Printpd in laoan RadioFans.CN 收音机爱 好者资料库 WTO SERVICE PERSONAL 1. Critical Compnentt Information. Components having special characteristics are marked A and must be replaced with parts having specifications equal to those originally installed. 2. L

3、eakage Current Measurement (For 120V Model Only). When service has been completed, it is imperative that you verify that all exposed conductive surfaces are properly insulated from supply circuits. EQUIPMENT AC LEAKAGE TESTER Meter impedance should be equivalent to 1500 UNDER TEST or EQUIVALENT ohm

4、shunted by 0.1 5pF. Leakage current must not exceed 0.5mA. B Be sure to test for leakage with the AC plug in WALL both polarities. OUTLET INSULATING TABLE - IISPECIFSCATIONS FM SECTION Tuning Range . 87.6 - 108.OMHz 50 dB Quieting Sensitivity . . . . . . . . . . . . Mono (DX) 1.6pV (15.3dBf) . . . .

5、 . . . . . (NR ON) 1.2pV (12.8dBf) Stereo (DX) . . . . . . . . . . . . 20pV (37.2dBf) . . . . . . . . . . (NR ON) 1OpV (3i.2dBf) h b l e Sensitivity (IHF Mono) 75a . . . . . . . . .0.9V (10.3dBf) Usable Sensitivity (DIN) . . . . . . . . . . . . Mono (SIN 26dB). .l .OpV (E) . . . . . . . . . . . . St

6、ereo (SIN 46dB) .3.OpV (E) I-e Rarpoma Ratio . . . . . . . . . . . . . . . 9548 . . . . . . . . . . . . . . . . IF Rslponro Ratio .l 15dB . . . . . . . . . . . . Spurious R-ms Ratio. .l l OdB . . . . . . . . . . . . . . . AM Suppression Ratio 70dB Capture Ratio Local . . . . . . . . . . . . . . . .

7、. . . . . . . 1.2dB Alternate Channel Selectivity DX . . . . . . . . . . . . . . . . . .85dB (U,C,R,A) Selectivity (two Signak)(DIN 40kHz Dev.) . . . . . . . . . . . . . . . . . . . . . . DX 70dB (E) Adjacent Channel Selsctivity DX . . . . . . . . . . . . . . . . . . 20dB (U,C,R,A) Signal to Noise R

8、atio (IHF) . . . . . . . . . . . . . . . . Mono .94dB (U,C,R,A) . . . . . . . . . . . . . . . Stereo :86dB (U,C,R,A) Signal to Nobe Ratio . . . . . . . . . . . (DIN-Weighted) Mono 88dB (E) . . . . . . . . . . Stereo. 80dB (E) Harmonic Distortion . Mono 100Hz. .DX0.03%, Local 0.02% (U,C,R,A) . . 1 kH

9、z .DX0.15%, Local 0,03%(U,C,R,A) 6kHz . . .DX0.4%, Local 0.06% (U,C,R,A) Stereo lM3Hz . .DX0.5%, Local 0.04% (U,C,R,A) 1 kHz . .DXO.5%, Local 0.03% (U,C,R,A) 6kHz. . .DX0.8%, Local 0.07% IU,C,R,AI (4OkHz Dev) Stereo 100Hz . . . . . . DX 0.5%, Local 0.05% (E) l kHz . . . . . . . DX 0.5%. Local 0.04%

10、(El . . . . . 6.3kHz. OX 0.5%, Local 0.08% (E) Strreo Separation (IkHz) (Local) mkHz. a. .65dB 1 kHz. . . . . . . . . . . .65dB (U,C,R,A) 60dB (E) 10kHz . . . . . . . . . . . 50dB (U,C,R,A) 40dB (E) F-affiy Raporar 0+O.d9 . 50Hz to lOkHz . -0.3 Subcarrier Product Ratio . . . . . . . . . . . . . 65dB

11、 Metat Saturation Level . . . . . . . . . -3mV (75dBf) AM SECTION Tuning Range . . . . . . . . .510 - 1620kHz (U,C,R) 513 - 1620kHz (E.A,R) Usable Sansitivity . . . . . . . . . . . . . . . . . ,250pV Selectivity. . . . . . . . . . . . . . . . . . . . . 30dB Signal to N o b Ratio. . 55dB Image R w n

12、s e Ratio . . . . . . . . . . . . . . . 40dB Spurious Response Ratio. . . . . . . . . . . . . . 50dB Distortion (400Hz). . 0.2% AUDIO SECTION Output Levelllmpedance (HIGH) FM (100% MOD, 1kHz) . . . . 1V/2ka (U,C,R,A) 1.6VI2kS2 (E) . FM (30% MOD, 400Hz) 0.3VIZkn . REC CAL (50% MOD, 333Hz) 0.5V12kn .,

13、 Output Level/lmpedanee (LOW) i FM (100% MOD, IkHz) . . 0.5VI2.5ka (U,C,R,A) 0.8V12.5kn (E) AM (100% MOD, l kHzl . . . . . . . 0.15V12.5kSZ REC CAL (50% MOD, 333Hz) . . . 0.25VI2.5kn GENERAL Power Supply . . . . . . . . U.S. 2 A: Australian Model J: Japanese Model - . - . -. . -. .,- . . -1. RadioFa

14、ns.CN 收音机爱 好者资料库 WREAR PANELS U .S .ode, AM 1,08OkHz, FM 92.6 MHz and FM 98.OMHz are automatic:;.! stored into preset memories 8 to 10 respectively. AM ANT AMSG TUNING Make sure that auto search reception can UP, DOWN be made w t h the 400Hz 30% modu- TUNING button for lation both UP and DOWN adjust

15、ment, re- adjust VR204. Sensitivity con- I firmation l i TUNING MODE SW -+AUTO AM ANT AM SG 630kHz r 0.1 kHz 1440kHz + 0.1 kMz 1080kHz + 0.1 kHz (400Hz 30% modu- lation) switches and con- indicator above the PRESET ed, respectively. .In the same way, store the AM The TUNING MODE LED turns manuallmon

16、o MODE switch to operation con- be made with the TUNING button for UP and DOWN oper- ations. Also confirm that when FM is re- ceived, forced mon- 1 /OUTPUT OSC,DlSTM ! L o r R I I I VR204 Adjust so that all sig- I nal indicators light Confirm sensitivity by checking to see if tuning is made at the s

17、tandard values. 2 / Fun-scale signal i I level indicator ,? 1 When VR210 has I been turned after AM ANT AM SG /1080kHz t 0.1 kHz 58dBor lower 58dBb or lower 58dBb or lower . Who? sensitivity i s improper, ad- just a s described in steps (l l to (5). quency indicator. (When FM is or - switch. switch

18、is pressed, the following 3 memory opera- frequency in P2 is displayed and tion confirma- the P2 LED turns on. seconds have -r When the POWER switch is ON MODE switch to turned on, the frequency in P1 IN ITlAL STATION is displayed without respect to the frequency which is displayed before the POWER

19、switch is turned off. Therefore, before turning off the PWER switch, display a frequency which has . After 5 or more t this time, confirm that the seconds have pass- frequency in P1 is displayed and ed, turn on the TUNER CIRCUIT BOARD I Connect resistor across R467 to 5268, Full-scalle signal level indicator 1 Separation adiustrnent 1 l adiustment Center Meter (Ji 00036 or equivalent) m 7FM FRONT-END SECTION DC NFB MPX DECODER SECTION CIRCUIT BOARD (Panern Side) FRONT END CIRCUIT BOARD