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Yamaha RX-777, Service Manual

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Yamaha RX-777 Service Manual Download Page 20

A

1

2

3

4

5

6

7

8

9

B

C

D

E

F

G

H

I

J

K

L

SCHEMATIC DIAGRAM (OPERATION 1/2)

26

RX-777

1SS133
HZS4B2TD
HZS5A2TD
HZS5C2TD
HZS6A2TD
HZS6B2TD
HZS7A2TD
MTZJ12C

M38B59EFFP

SIR-481ST3F

NJM2068D-D

2SC4488

B C

E

2SD2375

2SA933S
2SC1740S
2SD1915F
DTA144ES

E

C

B

Anode

Cathode

1

25

26

40

41

65

66

80

E

C

B

1

4

8

+

–

~

~

★

All voltage are measured with a 10M

Ω

/V DC electric volt meter.

★

Components having special characteristics are marked 

s

 and must be replaced 

with parts having specifications equal to those originally installed.

★

Schematic diagram is subject to change without notice.

8

7

6

5

4

3

2

1

OUT

1

–Vcc

+IN

2

–IN

2

OUT

2

+Vcc

+IN

1

–IN

1

IC302: NJM2068D-D
Dual OP-Amp

Point  1  Pin 15 of IC301

Point  2  emitter of Q305 
and collector of Q307

POWER ON

(Connect the power cord)

POWER OFF
(Disconnect the power cord)

Q305 E

Q307 C

8

7

1

4

5

6

2

3

REGULATOR

RESET

FL DISPLAY

REMOTE

A

B

6.0

-14.6

5.3

6.0

5.3

-14.6

0

-14.7

-14.7

6.0

6.0

6.0

6.0

6.0

6.0

0

0

0

-14.6

-14.6

6.0

-14.3

-14.4

0

0

0
0

0

0

6.0

5.1

2.4

11.6

5.7

18.0

12.1

11.6

12.1

0

5.7

0

0

0

5.1

0

13.9

6.0

5.3

6.7

6.0

5.3

6.7

0

13.2

13.9

0

0

5.1

0

0

0

5.1

5.7

5.2

6.0

5.7

-14.6

5.3

0

2.3

5.3

2.3

0

5.3

0

2.5

0

0.6

0.8

0

0

0

0

5.3

-14.6

-14.6

5.3

5.3

5.3

5.3

5.3

5.3

2.4

5.3

5.3

5.3

5.3

5.3

5.2

5.2

5.2

5.3

5.3

0

2.3

2.5

5.3

5.3

5.3

5.3

5.3

0

2.4

5.3

5.3

0.1

5.3

0.1

5.3

-26.7

-26.6

~

~

~

~

-26.6

~

~

~

~

-26.6

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

0

5.2

18.0

-26.8

2.3

0.8

0

5.2

0

0

0

0

5.3

5.3

5.0

5.0

5.3

0

5.3

0

-26.6

-26.7

~

~

-26.6

~

~

~

~

-26.6

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

-20.8

-20.8

-20.8

-20.8

-26.8

-21.2

A

2

1

B

P25

F7

P25

F8

P27

E1

P26

I6

P25

H4

P28

C1

P26

D8

FR441

12

R216

2.2

M38B57M6-172FP

Summary of Contents for RX-777

Page 1: ...ple 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 Modifications are therefore inevitable and specifications are subject to change without notice or obligation to retrofit Should any discrepancy appear to exi...

Page 2: ...es 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 TO 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 Measurement For 120V Models...

Page 3: ...RX 777 RX 777 2 REAR PANELS U model C model A model ...

Page 4: ...cteristics Bass Boost Cut 10 dB 20 Hz Turnover Frequency 350 Hz Treble Boost Cut 10 dB 20 kHz Turnover Frequency 3 5 kHz Continuous Loudness Control Attenuation 1 kHz 30 dB Gain Tracking Error 0 to 60 dB 2 dB or less FM Section Tuning Range U C models 87 5 to 107 9 MHz A model 87 50 to 108 00 MHz 50 dB Quieting Sensitivity IHF 1 kHz 100 Mod Mono 2 0 µV 17 3 dBf Stereo 25 µV 39 2 dBf Usable Sensiti...

Page 5: ... 4 INTERNAL VIEW w r t y u e i o 1 2 0 3 4 5 6 q q MAIN 5 P C B w MAIN 2 P C B e MAIN 3 P C B r MAIN 1 P C B t INPUT 4 P C B y INPUT 1 P C B u INPUT 2 P C B i INPUT 3 P C B o OPERATION 8 P C B 0 OPERATION 1 P C B 1 OPERATION 6 P C B 2 MAIN 4 P C B 3 OPERATION 4 P C B 4 OPERATION 5 P C B 5 OPERATION 2 P C B 6 OPERATION 3 P C B ...

Page 6: ...end as shown in Fig 2 f Connect the ground point of OPERATION 8 P C B to rear panel by using wire as shown in Fig 2 f Connect the ground point of OPERATION 8 P C B to rear panel by using wire as shown in Fig 2 g Connect the J420 J421 of OPERATION 8 P C B to rear panel by using wire as shown in Fig 2 CAUTION The ground point J420 and J421 must be connected to Rear Panel to keep the circuit in norma...

Page 7: ...36 R ch 0 1mV 10 0mV DC R175 L ch R176 R ch Cut off TEST MODE CAUTION Before setting to the TEST mode write down the existing preset memory content of the Tuner in a table as shown below This is because setting to the TEST mode will cause the memory content to be as factory set i e all the preset memory by the user will be erased Preset group P1 P2 P3 P4 P5 P6 P7 P8 A B C D E Preset group P1 P2 P3...

Page 8: ...n DC port pin No 79 input voltage Turn the POWER SW ON while pressing the EDIT and No 7 keys simultaneously The unit enters the TEST mode to display the Protection DC port input voltage as an AD value for 3 sec The microprocessor will not respond to any commands while in this mode Cancel When the POWER is turned OFF the TEST mode is cancelled PROTECTION FUNCTION When the microprocessor detect an a...

Page 9: ... u t u t u t u t u t u t u P16 w v V301 13 BT 181GK V6994700 PIN CONNECTION GRID ASSIGNMENT ANODE CONNECTION Pin No Connection Pin No 41 F2 40 F2 39 NP 38 NP 37 13G 36 12G 35 11G 34 10G 33 9G 32 8G 31 7G 30 6G 29 5G 28 4G 27 3G 26 2G 25 1G 24 NX 23 NX 22 NX 21 NX 20 P1 19 P2 18 P3 17 P4 16 P5 15 P6 14 P7 13 P8 12 P9 11 P10 10 P11 9 P12 8 P13 7 P14 6 P15 5 P16 4 NP 3 NP 2 F1 1 F1 Connection Note 1 ...

Page 10: ... 8 H ON 35 P35 O DIG 7 FL DIGIT 7 H ON 64 P2 0 Buz 02 FLD 0 63 P2 1 FLD 1 62 P2 2 FLD 2 61 P2 3 FLD 3 60 P2 4 FLD 4 59 P2 5 FLD 5 58 P2 6 FLD 6 57 P2 7 FLD 7 56 P0 0 FLD 8 55 P0 1 FLD 9 54 P0 2 FLD 10 53 P0 3 FLD 11 52 P0 4 FLD 12 51 P0 5 FLD 13 50 P0 6 FLD 14 49 P0 7 FLD 15 48 P1 0 FLD 16 47 P1 1 FLD 17 46 P1 2 FLD 18 45 P1 3 FLD 19 44 P1 4 FLD 20 43 P1 5 FLD 21 42 P1 6 FLD 22 41 P1 7 FLD 23 40 P...

Page 11: ... 14 H ON 56 P00 O SEG 15 FL SEGMENT 15 H ON 57 P27 O SEG 16 FL SEGMENT 16 H ON 58 P26 O VREC2 VIDEO REC OUT SELECTOR CONTROL 2 59 P25 O VREC1 VIDEO REC OUT SELECTOR CONTROL 1 60 P24 O Vin2 VIDEO INPUT SELECTOR CONTROL 2 61 P23 O Vin1 VIDEO INPUT SELECTOR CONTROL 1 62 P22 I STEREO TUNER MODE STEREO 63 P21 I TUNED TUNER MODE TUNED 64 P20 O T MU TUNER MUTING 65 P57 O T CE TUNER 66 P56 O CLK SERIAL CL...

Page 12: ...L TUR 15 R2R E R2L 15 PHR E PHL LB Vin1 Vin2 VREC1 VREC2 VCR VE POL E POR 15 MIR E MIL 15 MU CUSTM1 CUSTM2 FROM MAIN 4 TO OPERATION 2 TO OPERATION 8 TO OPERATION 8 TO OPERATION 8 12 11 PRINTED CIRCUIT BOARD Foil side Ref No Location D502 H4 IC502 B5 IC503 C5 IC504 C4 IC507 G3 IC508 H3 IC509 B3 IC510 C3 IC511 C3 IC512 C3 Semiconductor Location Ref No Location Q503 D3 Q504 D3 Q505 D3 Q506 D4 Q507 B6...

Page 13: ...OTE CONTROL IN OUT PHONO ZONE 2 OUT INPUT 4 P C B INPUT 3 P C B R2R 15 E R2L 15 PHR E PHL POL E POR 15 MIR E MIL 15 MU CUSTM1 CUSTM2 TO OPERATION 8 TO INPUT 1 14 13 PRINTED CIRCUIT BOARD Foil side Ref No Location IC501 F3 IC506 B4 Q501 G3 Q502 G3 Semiconductor Location ...

Page 14: ...TUL 15 R2R E R2L 15 PHR E PHL LB Vin1 Vin2 VREC1 VREC2 VCR VE R2L E R2R 15 PHL E PHR 15 5V TE CLK T_CE STEREO T_MU TE TUNED TUR TUL 12 T_DO DATA 2 B A 1 1 5 TO OPERATION 8 TO INPUT 2 TO INPUT 1 TO INPUT 1 TO INPUT 3 refer to Fig 2 of P 5 Ground Point FROM TUNER PACK TO OPERATION 2 TO MAIN 3 TO MAIN 3 Point 1 Pin 15 of IC301 Point 2 emitter of Q305 and collector of Q307 POWER ON Connect the power c...

Page 15: ... R1 E R2 E L2 E L1 VRP VRG VRup VRdn LED2 LED1 R1 E R2 E L2 E L1 HR E HL DG B A OP OP MIL E MIR E POR E POL E R E E L E CDR E CDL 15 15 VRup VRdn PDon CDon HL E HR DG B A HL E HR DG B A LDL1 LDL2 E LDR2 LDR1 TO OPERATION 3 TO MAIN 1 TO OPERATION 8 TO INPUT 1 FROM OPERATION 2 TO MAIN 1 TO OPERATION 4 FROM OPERATION 2 TO OPERATION 6 FROM OPERATION 4 LDL1 LDL2 E LDR2 LDR1 TO OPERATION 5 FROM OPERATIO...

Page 16: ...ANSFORMER Ref No Location Q101 B2 Q102 B2 Q103 B4 Q104 B3 Q105 B4 Q106 B3 Q107 B4 Q108 B3 Q109 B4 Q110 B3 Q111 C4 Q112 C3 Q113 B4 Q114 B3 Q115 B4 Q116 B3 Q117 D5 Q118 D2 Q119A D4 Q119C E4 Ref No Location Q120A D3 Q120C E3 Q125 C4 Q126 C3 Q127 F4 Q128 F3 Q129 G2 Q130 B5 Q131 B6 Q134 G2 Q135 B5 Q136 H5 Q137 H2 Q143 H2 Q144 H4 Q145 G5 20 19 PRINTED CIRCUIT BOARD Foil side Ref No Location D101 B4 D102...

Page 17: ...C PRDC PRI RY B SP RY HP RY A SP PRPS LB E E LB 25 RYHP_C LB E LB E DG SP B SP A PRPS E_LED MU PRPS PRI RY B SP MU FL1 DG SP A PRDC RYPS RY A SP FL2 LB 12V 25 RYHP SP B TO MAIN 1 TO MAIN 3 TO MAIN 4 TO MAIN 1 FROM MAIN 2 TO OPERATION 1 FROM MAIN 2 FROM MAIN 5 TO MAIN 1 TO MAIN 3 22 21 PRINTED CIRCUIT BOARD Foil side Ref No Location D111 A3 D112 A3 D123 B2 D125 A3 D127 A3 Q142 B3 Semiconductor Loca...

Page 18: ...AA IC509 0dB DVD IC510 0dB D TV IC406 IC501 BUFFER BUFFER IC511 0dB VCR TAPE MD OUT D REC2 IC512 0dB TAPE MD Q505 506 VCR OUT D REC1 Q311 312 ZONE2 OUT R2MU VR403 BALANCE PRE MAIN COUPLER VR404 LOUDNESS VR402 TREBLE SW401 CD DIRECT AMP Power Amp 35dB Q103 126 D101 106 RY101 RY104 Q142 F101 D120 D116 119 12000 63 12000 63 Q145 D131 Q130 D121 Q131 D122 A SPEAKERS AC IN RY102 RY103 B PHONES SPEAKERS ...

Page 19: ...ving special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed Schematic diagram is subject to change without notice CD DIRECT AMP BUFFER AMP BUFFER AMP INPUT SELECTOR REC OUT SELECTOR EQ AMP P26 A7 P26 A7 P26 E5 P26 B5 3 8 1 2 6 4 7 5 6 5 8 7 2 3 4 1 6 5 8 7 3 2 4 1 6 5 8 7 3 2 4 1 6 5 8 7 3 2 4 1 10 9 7 6 4 3 2 1 10 9 7 4 11 8 ...

Page 20: ...in 15 of IC301 Point 2 emitter of Q305 and collector of Q307 POWER ON Connect the power cord POWER OFF Disconnect the power cord Q305 E Q307 C 8 7 1 4 5 6 2 3 REGULATOR RESET FL DISPLAY REMOTE A B 6 0 14 6 5 3 6 0 5 3 14 6 0 14 7 14 7 6 0 6 0 6 0 6 0 6 0 6 0 0 0 0 14 6 14 6 6 0 14 3 14 4 0 0 0 0 0 0 6 0 5 1 2 4 11 6 5 7 18 0 12 1 11 6 12 1 0 5 7 0 0 0 5 1 0 13 9 6 0 5 3 6 7 6 0 5 3 6 7 0 13 2 13 9...

Page 21: ... 6 IN 2 OUT 1 8 VCC 2 10 OUT 2 9 P2 INPUT LOGIC PRE DRIVER 7 VCC 1 All voltage are measured with a 10MΩ V DC electric volt meter Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed Schematic diagram is subject to change without notice SPEAKERS PHONES PURE DIRECT AMP 7 6 5 4 1 3 2 8 8 4 0 5 2 0 0 1 0 13 8 0...

Page 22: ...Y R223 1P 82 D2375 Q P 0 0 14 6 14 6 0 0 14 8 15 4 15 4 0 0 15 4 15 4 14 8 15 7 18 5 6 3 19 5 18 6 18 6 18 5 26 7 0 27 4 0 7 0 7 0 0 18 5 0 5 19 5 19 5 0 1 18 6 19 5 0 1 18 6 0 18 6 18 5 18 6 19 5 0 0 15 6 18 6 0 0 56 6 45 6 56 5 45 5 0 AC 30 5 AC 82 4 AC 4 2V 14 0 9 7 0 1 0 1 0 14 0 6 3 0 14 0 6 2 6 3 0 6 2 AC 66 5 AC 12 6 14 3 0 56 2 0 14 3 56 6 56 4 0 0 5 1 1 0 5 55 4 0 5 0 56 5 56 5 0 6 1 1 56...

Page 23: ...DULE FLTR LC RF LC FILTER EMI GND MTL GROUND PLATE GND TERM GROUND TERMINAL HOLDER FUS FUSE HOLDER IC PRTCT IC PROTECTOR JUMPER CN JUMPER CONNECTOR JUMPER TST JUMPER TEST POINT L DTCT LIGHT DETECTING MODULE L EMIT LIGHT EMITTING MODULE LED DSPLY LED DISPLAY LED INFRD LED INFRARED MODUL RF MODULATOR RF PHOT CPL PHOTO COUPLER PHOT INTR PHOTO INTERRUPTER PHOT RFLCT PHOTO REFLECTOR PIN TEST PIN TEST P...

Page 24: ...EL 100uF 25V C554 VG287600 C EL 100uF 25V C555 UA652220 C MYLAR 220pF 50V C556 UA652220 C MYLAR 220pF 50V C557 UA655100 C MYLAR 0 1uF 50V C558 VF466800 C CE TUBLR 100pF 50V C559 VF466800 C CE TUBLR 100pF 50V C560 UR837100 C EL 10uF 16V C561 UR819100 C EL 1000uF 6 3V C562 UR837100 C EL 10uF 16V C563 UR819100 C EL 1000uF 6 3V C564 UR837100 C EL 10uF 16V C565 UR819100 C EL 1000uF 6 3V C566 VG286300 C...

Page 25: ...uF 16V C305 UM397100 C EL 10uF 16V C306 UR866100 C EL 1uF 50V C307 VU545000 C EL 47000uF 5 5V C308 VJ599100 C CE TUBLR 0 1uF 50V C309 VJ599100 C CE TUBLR 0 1uF 50V C310 VF466700 C CE TUBLR 47pF 50V C311 VF466700 C CE TUBLR 47pF 50V C312 UR848470 C EL 470uF 25V C313 VD930900 C CE SMI 0 1uF 25V C314 UR837100 C EL 10uF 16V C315 VF466700 C CE TUBLR 47pF 50V C316 VF466700 C CE TUBLR 47pF 50V C318 VJ599...

Page 26: ...Q21304M SW305 V2014900 SW TACT EVQ21304M SW306 V2014900 SW TACT EVQ21304M SW307 V2014900 SW TACT EVQ21304M SW308 V2014900 SW TACT EVQ21304M SW309 V2014900 SW TACT EVQ21304M SW310 V2014900 SW TACT EVQ21304M SW311 V2014900 SW TACT EVQ21304M SW312 V2014900 SW TACT EVQ21304M SW313 V2014900 SW TACT EVQ21304M SW314 V2014900 SW TACT EVQ21304M SW315 V2014900 SW TACT EVQ21304M SW316 V2014900 SW TACT EVQ213...

Page 27: ...16 VE198800 TR 2SC2705 O Y Z Q117 VK432900 TR 2SD1915F S T Z Q118 VK432900 TR 2SD1915F S T Z Q119A iX603580 TR PAIR 2SA1358 O Y Z Q119C iX603590 TR PAIR 2SC3421 O Y Z Q120A iX603580 TR PAIR 2SA1358 O Y Z Q120C iX603590 TR PAIR 2SC3421 O Y Z Q121A iX615750 TR PAIR 2SA1694 O P Y Z Q121C iX615760 TR PAIR 2SC4467 O P Y Z Q122A iX615750 TR PAIR 2SA1694 O P Y Z Q122C iX615760 TR PAIR 2SC4467 O P Y Z Q12...

Page 28: ...8 FCM3 5 V7167900 P C B ASS Y INPUT 6 V7168600 P C B ASS Y MAIN UC 6 V7168800 P C B ASS Y MAIN A 7 V7168900 P C B ASS Y OPERATION UC 7 V7169000 P C B ASS Y OPERATION A 8 V6782300 AM FM TUNER TFCE1U115A U C UC 8 V6782400 AM FM TUNER TFCE1E317A A B G A Z 11 XZ861A00 POWER TRANSFORMER U Z 11 XZ862A00 POWER TRANSFORMER C Z 11 XZ863A00 POWER TRANSFORMER A Z 12 V2296800 POWER CORD ASS Y A Z 12 V2363800 ...

Page 29: ...E SCREW 3x15 8 MFC2 125 V2728500 BIND HEAD S TITE SCREW 4x7 MFZN2 BL 126 21991500 PW HEAD S TITE SCREW 4x8 10 FCRM3 BL BL 127 AA627310 GROUND TERMINAL 128 VY731200 BONDING HEAD TAPPING SCREW 3x10 MFNI33 129 EP600250 BIND HEAD B TITE SCREW 3x8 ZMC2 Y 130 VU984400 RING D14 131 V2064200 DAMPER 150 VZ679700 DAMPER T8 PCB ACCESSORIES 200 V6893700 REMOTE CONTROL TRANSMITTER RAX11 200 1 AAX13340 LID BLJY...

Page 30: ...t No 1 0 Ω HJ35 3100 HF85 3100 1 8 Ω HJ35 3180 2 2 Ω HJ35 3220 HF85 3220 3 3 Ω HJ35 3330 HF85 3330 4 7 Ω HJ35 3470 HF85 3470 5 6 Ω HJ35 3560 HF85 3560 10 Ω HF45 4100 HF45 4100 15 Ω HJ35 4150 HF85 4150 22 Ω HF45 4220 HF45 4220 27 Ω HJ35 4270 HF85 4270 33 Ω HF45 4330 HF45 4330 39 Ω HJ35 4470 HF85 4390 47 Ω HF45 4470 HF45 4470 56 Ω HF45 4560 HF45 4560 68 Ω HF45 4680 HF45 4680 75 Ω HF45 4750 HF45 4750...

Page 31: ...1 1 ohm IR1 IR LED REMOTE CONTROL TRANSMITTER SCHEMATIC DIAGRAM A B C D E 1 2 3 4 5 6 7 RX 777 39 1 3 5 6 8 7 9 11 10 14 12 16 15 17 19 18 20 22 21 23 25 24 26 28 27 29 30 31 32 33 34 2 Key No Data Function 1 2 3 5 6 7 8 9 10 11 12 14 15 16 17 18 19 20 1E 1F 04 06 01 00 02 07 03 40 4F 0B 08 0A 0D 09 0C 11 Function Keychart Key No Data Function 21 22 23 24 25 26 27 28 29 30 31 32 33 34 10 12 16 15 ...

Page 32: ...RX 777 RX 777 ...

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