Yamaha DSP-AX620 Service Manual

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Owner's manual (73 pages)

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SERVICE MANUAL

IMPORTANT NOTICE

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 to 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.

The presentation or sale of this manual to any individual or firm does not constitute authorization, certification

or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any

form.

Static discharges can destroy 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).

Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the

unit.

Ic Data ................................................................ 29 – 36

Display Data .................................................... 37 – 38

Pin Connection Diagram ..................................... 39

Block Diagram ................................................ 40 – 43

Printed Circuit Board ................................. 44 – 67

SCHEMATIC DIAGRAM ....................................... 68 – 73

Parts List .......................................................... 74 – 92

Remote Control Transmitter .................. 93 – 95

AV AMPLIFIER

Table of Contents

Summary of Contents for Yamaha DSP-AX620

Page 1: Service Manual
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 specifically YAMAHA Products, are already known and understood by the users, and have therefore not been restated.
Page 2: To Service Personnel
DSP-AX620 TO SERVICE PERSONNEL Critical Components Information AC LEAKAGE Components having special characteristics are marked Z WALL EQUIPMENT TESTER OR and must be replaced with parts having specifications equal UNDER TEST OUTLET EQUIVALENT to those originally installed. INSULATING TABLE FRONT PANEL...
Page 3 DSP-AX620 REAR PANELS R, T models 240V B model G model...
Page 4: Specifications
DSP-AX620 SPECIFICATIONS AUDIO SECTION VIDEO SECTION Minimum RMS Output Power per Channel Video Signal Type MAIN, 20Hz to 20kHz, 0.06% THD, 8Ω ..90W+90W B, G models ....... . . PAL CENTER, 20Hz to 20kHz, 0.06% THD, 8Ω...
Page 5 DSP-AX620 DIMENSIONS SUPERIMPOSING Input DVD, etc. Output Superimposing Terminal Signal Monitor connection O (On screen) — — O (On screen) O (On screen) — — O (Blue back) — — O (On screen) — O (Blue back) — O (Blue back)
Page 6: Internal View
DSP-AX620 SET MENU TABLE SET MENU PRESET VALUE SETTING RANGES SPEAKER SET CENTER SPEAKER LARGE LARGE/SMALL/NONE MAIN SPEAKER LARGE LARGE/SMALL REAR L/R SPEAKER LARGE LARGE/SMALL/NONE LFE/BASS OUT BOTH SUBWOOFER/MAIN/BOTH MAIN LEVEL NORMAL NORMAL/–10dB L/R BALANCE L — 0 — R (0.5 step) (L/R 10.0)
Page 7: Disassembly Procedures
DSP-AX620 DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.) 1. Removal of Top Cover Remove 8 screws ( q and w ) and then remove the Top Cover in Fig. 1. 2. Removal of Front Panel Unit a. Remove 9 screws ( e, r and t ) in Fig. 1.
Page 8 DSP-AX620 5. Removal of Input (1)/(2) P.C.B. (Checking the Input (1)/(2) P.C.B. and Replacing Components) a. Remove the DSP P.C.B. b. Remove 1 screw ( !0 ) and then remove the Input (4) P.C.B. in Fig. 4. c. Remove 2 screws ( !1 ) and then remove the Operation (5) P.C.B. in Fig. 4.
Page 9 DSP-AX620 6. Removal of Main Chassis (Checking the Main (1) P.C.B. and Replacing Components) a. Remove the Front Panel Unit. b. Remove the Sub Chassis Unit. c. Remove the DSP P.C.B. d. Remove the Input (4) P.C.B, Operation (5)/(3)/(2) P.C.B.
Page 10: Self Diagnosis Function
DSP-AX620 SELF DIAGNOSIS FUNCTION This product has a built-in self diagnosis function (DIAG) to facilitate inspection, measurement and determination of a faulty item, if any. There are 14 DIAG menu items each of which has sub-menu items. Listed in the table below are menu items and sub-menu items.
Page 11 DSP-AX620 Starting DIAG Press the “POWER” (STANDBY/ON) key of the main unit while pressing the “EFFECT” key and the “INPUT MODE” key simultaneously, and DIAG will be activated. Starting DIAG in the protection cancel mode If the protection function activates and causes hindrance to trouble diagnosis, disable the protection function as described below, and it will be possible to enter the DIAG mode.
Page 12 DSP-AX620 If the protection function activates after DIAG has been started and the power is turned off ; When the protection function (*2) activates, the protection function history appears on the display and the power turns off. Repair the faulty parts according to the displayed history.
Page 13 DSP-AX620 Operation procedure of DIAG menu and SUB-MENU There are 14 MENU items and some SUB-MENU items as well. DIAG menu selection Main unit: Jog dial w(forward)/q(reverse) PROGRAM EFFECT Remote control unit: Cursor N(forward)/B(reverse) key – SUB-MENU selection Main unit: DSP PROGRAM (forward)/EFFECT (reverse) key <...
Page 14 DSP-AX620 Details of DIAG menu 1. DSP THROUGH There are 6 sub menu items. ANALOG BYPAS [Remote control code: 7A—88(PRG 1)] 1.ANALOG BYPAS • The input mode is fixed to use the analog (A/D) system. • The L/R signal is output through the analog bypass without using the DSP section.
Page 15 DSP-AX620 M, C, R, SW CH [Remote control code: 7A—89 (PRG 2)] 1.M C R SW CH • The input signal is automatically identified and switched in the priority order of dts DOLBY DIGITAL PCM AUDIO Analog (A/D) according to the signal detection.
Page 16 DSP-AX620 MAIN HPF [Remote control code: 7A—8A (PRG 3)] 1.MAIN HPF MAIN HPF is turned on and output. (Head margin included) Head margin MAIN L/R: 0/-3/-12/-18 dBF CENTER: Mute FL/FR: Mute RL/RR: Mute SWFR: Mute Reference INPUT : DVD ANALOG...
Page 17 DSP-AX620 FULL BIT F [Remote control code: 7A—92 (PRG 11)] 1.FULL BIT F The front channel signal is output in full bit to the main channel. Reference INPUT : DVD ANALOG SWFR: 50Hz, Others: 1kHz SPEAKERS Condition MAIN L/R CENTER...
Page 18 DSP-AX620 FULL BIT-6dB [Remote control code: 7A—03 (TAPE STOP)] 1.FULL BIT-6DB The head margin is included and the digital data is output in half bit. Head margin MAIN L/R: -6 dBFS CENTER: -6 dBFS FL/FR: Mute RL/RR: -6 dBFS SWFR: Add L/R signal at -6 dBFS.
Page 19 DSP-AX620 2. FRONT CH • The input signal is automatically identified and switched in the priority order of dts DOLBY DIGITAL PCM AUDIO Analog (A/D) according to the signal detection. • The front channel signal is output to the main channel.
Page 20 DSP-AX620 3. RAM THROUGH • The input signal is automatically identified and switched in the priority order of dts DOLBY DIGITAL PCM AUDIO Analog (A/D) according to the signal detection. • C, RL/RR and FL/FR signals are output through the external DRAM.
Page 21 DSP-AX620 (2ch) *Multi: All Mute AC3D3 YSS928 ANALOG CODEC -3dB SDOB0 (A/D) MAIN AK4527 AK4382 (Decoder) DD/dts SUB DSP DECODER DIGITAL CODEC C/Mute SDOB1 -3dB/Mute (D/A) SWFR AK4527 SDOB2 Mute SDOB3 -12dB 4M DRAM 5. MARGIN CHECK • The input signal is automatically identified and switched in the priority order of dts...
Page 22 DSP-AX620 6. MAIN MIX • The input signal is automatically identified and switched in the priority order of dts DOLBY DIGITAL PCM AUDIO Analog (A/D) according to the signal detection. • There are two sub-menu items. • The center and SW signals are output through the main channel.
Page 23 DSP-AX620 7. OTHER INPUT The signal input through the 6CH INPUT terminals is output. EXTERNAL DEC [Remote control code: 7A—8F (PRG 8)] 7.EXTERNAL DEC Reference INPUT : 6CH INPUT SWFR: 50Hz, Others: 1kHz SPEAKERS Condition MAIN L/R CENTER REAR L/R...
Page 24 DSP-AX620 9. MANUAL TEST The test noise is output by the noise generator with a built-in DSP from the channels specified by the sub-menu. There are seven sub-menu items. The noise frequency is 35 - 250Hz for LFE and 800Hz as the center frequency otherwise.
Page 25 DSP-AX620 11. AD DATA The sub-menu of this menu displays the A/D conversion value of the CPU (operation circuit board IC501) which detects the keys and protection functions of the main unit in %. (reference voltage 5V: 100%) When in KY0/KY1/KY2 page, it is not possible to operate the keys of the main unit because the values of all keys are detected.
Page 26 DSP-AX620 12. IF STATUS (Input function status) Using this menu, the status data is displayed in the hexadecimal notation one after another. During signal processing, the status before execution of this menu is maintained. To convert the analog input to the digital input, use the following procedure.
Page 27 DSP-AX620 5th byte Indicate Indicates the information on the signal processing status. 0 0 0 0 0 0 0 0 bit7 MUTE requested 7 6 5 4 3 2 1 0 bit6 dts flashing (Red) bit5 EX sound field being processed...
Page 28 DSP-AX620 13. DSP RAM CHECK [Remote control code: 7A—0A (CD SKIP +)] This menu is used to self-diagnose whether or not YSS928 (IC801 of DSP circuit board) and external RAM (IC802 of DSP circuit board) are connected properly. During signal processing, the status before execution of this menu is maintained.
Page 29: Amp Check
DSP-AX620 AMP CHECK Confirmation of Idling Current 1) No signal applied. 2) Non-loaded condition. 3) Aging is not neccessary. Cut OFF Test Point Note Item Rating (DC) MAIN L R145 If the measured voltage exceeds 10.1mV, cut MAIN R R150...
Page 30 DSP-AX620 IC DATA IC501 : µPD784217AGF (OPERATION P.C.B.) 16 bit µ-COM (CPU) P85/A5 P06/INTP6 P86/A6 P05/INTP5 P87/A7 P04/INTP4 P40/AD0 P03/INTP3 P41/AD1 P02/INTP2/NMI P42/AD2 P01/INTP1 P43/AD3 P00/INTP0 P44/AD4 RESET P45/AD5 P46/AD6 P47/AD7 P50/A8 P51/AD9 P52/AD10 P53/AD11 P127/RTP7 P54/AD12 P126/RTP6 P55/AD13 P125/RTP5...
Page 31 DSP-AX620 IC501 : µPD784217AGF (OPERATION P.C.B.) 16 bit µ-COM (CPU) No. PORT Name I/O Function o. PORT Name I/O Function P60/A16 TC74HC164 CLOCK 100 Vss Ground P61/A17 99 P57/A15 O LC78211/LC78213 CE P62/A18 98 P56/A14 O NC P63/A19 97 P55/A13...
Page 32 DSP-AX620 IC801 : YSS928 (DSP P.C.B.) AC3D3 RAMA10 RAMD2 RAMA11 RAMD1 RAMD0 VDD2 VDD2 SELI8 SELI7 OPORT7 SELI6 OPORT6 SELI5 OPORT5 RAMA12 OPORT4 RAMA13 OPORT3 RAMA14 OPORT2 RAMA15 OPORT1 RAMA16 OPORT0 RAMA17 ZEROBF2L OVFB/END ZEROBF2R ZEROFLG ZEROBF3L ZEROBF3R NONPCM VDD1...
Page 33 DSP-AX620 IC801 : YSS928 (DSP P.C.B.) AC3D3 Name Function Crystal oscillator connecting terminal Crystal oscillator connecting terminal (24.576MHz ) SELI1 Built-in selector input 1 (AXD) SELI0 Built-in selector input 0 (GND) SELOA Built-in selector output A (ISEL) SELOB Built-in selector output B...
Page 34 DSP-AX620 IC801 : YSS928 (DSP P.C.B.) AC3D3 Name Function SDWCKI1 Word clock input terminal for SDIB, SDOB interface (Unconnected) SDBCKI1 Bit clock input terminal for SDIB, SDOB interface (Unconnected) Ground terminal SDOB3 PCM output terminal from Sub DSP SDOB2 PCM output terminal from Sub DSP...
Page 35 DSP-AX620 IC801 : YSS928 (DSP P.C.B.) AC3D3 Name Function RAMA5 Sub DSP: External memory address terminal 5 RAMA2 Sub DSP: External memory address terminal 2 SELI13 Built-in selector input 13 (Unconnected) SELI12 Built-in selector input 12 (Unconnected) SELI11 Built-in selector input 11 (Unconnected)
Page 36 DSP-AX620 IC587 : LC74781-9798 (OPERATION P.C.B.) Superimpose VSS1 VDD1 XTAL IN XTAL OUT CTRL3 CTRL1 CTRL2 BLANK SEP IN OSC IN SEP OUT OSC OUT SEPC CHARA SYN IN VDD1 SCLK CV IN VDD2 CV OUT SERIAL 8 BIT LATCH...
Page 37 DSP-AX620 IC587 : LC74781-9798 (OPERATION P.C.B.) Superimpose Pin No. Symbol Terminal name Function Ground terminal Connection to GND (Digital system ground terminal) VSS1 Crystal oscillation Terminal to connect the crystal of the crystal oscillator for internal synchronous XTAL IN terminal signal generation and a capacitor or to input an external clock.
Page 38: Display Data
DSP-AX620 DISPLAY DATA V501 : 10-BT-236GNK (V6785800) PATTERN AREA PIN CONNECTION Pin No. Connection F1 NP NP P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P16 P17 P18 P19 P20 P21 P22 P23 P24 P25 P26 Pin No.
Page 39 DSP-AX620 ANODE CONNECTION...
Page 40: Pin Connection Diagram
DSP-AX620 PIN CONNECTION DIAGRAM µPC29M33T-E1 NJM78L05A-T3 NJM79M05FA NJM7805FA PQ025EZ5MZP TC74HCU04AP TC74HC4053AP NJM79M12FA NJM7812FA 1: VIN 1:OUTPUT 1: INPUT 2: VC 1:COMMON 2:COMMON 2: GND 1: OUTPUT 3: VO 2:INPUT 3: OUTPUT 3:INPUT 2: COMMON 4: NC 3:OUTPUT 4: GND 5: GND...
Page 41 DSP-AX620 BLOCK DIAGRAM D743-746 T741 See page E-68/J-66 (DSP) XL801 CONVERTER COAXIAL IC801 YSS928 IC808A IC808B IC811A Q741 SDOB0 L (DAL) See page E-73/J-71 (POWER) – IC815 AK4382 IC811B SIGNAL R (DAR) CXDTA – DETECTOR IC808C IC705 D723 IC703 OPTICAL...
Page 42 DSP-AX620 BLOCK DIAGRAM CONTROL IC581A C-INPUT IC584B Q584 SELECTOR D-TV/CBL IC582 Q581 Y-INPUT SELECTOR VCR 1 IC583 Q583 IC585 Q585 VCR 2 VIDEO OUTPUT Q586 – 589 EXPANSION VIDEO HP-RELAY IC586 CONTROL IC584A SP-RELAY XL501 10MHz 87-90 XL581 Q587 IC588...
Page 43 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) Point q (Pin 1 of IC801) DSP P. C. B. (Lead Type Device) V : 2V/div, H : 50 nsec/div DC, 1 : 1 probe FROM : INPUT (1) Semiconductor Location Ref. No. Location Ref.
Page 44 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) Semiconductor Location INPUT ( 1 ) P. C. B. (Lead Type Device) Ref. No. Location IC301 IC302 IC303 FROM : INPUT (2) IC304 FROM : INPUT (2) W581 FROM : DSP TO : INPUT (4)
Page 45 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) Semiconductor Location Ref. No. Location IC311 IC313 IC314 IC315 INPUT ( 1 ) P. C. B. (Surface Mount Device) IC316 IC317 IC319 IC320 Ref. No. Location Q301 Q302 Q303 Q304 Q305 Q306 Q308 E-48/J-46...
Page 46 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) INPUT ( 2 ) P. C. B. INPUT ( 2 ) P. C. B. INPUT ( 3 ) P. C. B. (Lead Type Device) (Surface Mount Device) (Lead Type Device) INPUT ( 3 ) P. C. B.
Page 47 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) OPERATION ( 2 ) P. C. B. (Lead Type Device) 6CH INPUT S–VIDEO OPERATION ( 2 ) P. C. B. (Surface Mount Device) Semiconductor Location Ref. No. Location Ref. No. Location D581 Q581 D582...
Page 48 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) Point w (Pin 38 of IC501) OPERATION ( 1 ) P. C. B. V : 2V/div, H : 0.1 µsec/div (Lead Type Device) DC, 1 : 1 probe TO : OPE (9) #505 W505...
Page 49 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) Semiconductor Location OPERATION ( 1 ) P. C. B. (Surface Mount Device) Ref. No. Location D501 D502 D503 D504 D505 D506 D507 R, T only D508 D509 R, T, B, G only D510 D511 D512 Ref.
Page 50 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) OPERATION ( 6 ) P. C. B. OPERATION ( 5 ) P. C. B. (Lead Type Device) (Lead Type Device) OPERATION ( 5 ) P. C. B. VIDEO AUX SILENT (Surface Mount Device) W711...
Page 51 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) Semiconductor Location MAIN ( 1 ) P. C. B. Ref. No. Location Ref. No. Location D101 Q101 D102 Q102 FROM : OPE (1) D103 Q103 PRVI D104 Q104 D105 Q105 D106 Q106 TO : MAIN (3)
Page 52 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) MAIN ( 5 ) P. C. B. MAIN ( 2 ) P. C. B. FROM : MAIN (1) W372 TO : MAIN (6) W109 TO : MAIN (1) –12 –25 –5 R, T, B, G only...
Page 53 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) R, T models J, B, G models POWER ( 2 ) P. C. B. POWER ( 1 ) P. C. B. POWER ( 1 ) P. C. B. TO : POWER (3) W722 J, B only...
Page 54 DSP-AX620 PRINTED CIRCUIT BOARD (Foil side) J, B, G models R, T models POWER ( 5 ) P. C. B. POWER ( 6 ) P. C. B. POWER ( 4 ) P. C. B. TO : POWER (1) TO : POWER (2)
Page 55 DSP-AX620 SCHEMATIC DIAGRAM (DSP) P-E69/J67 Point q (Pin 1 of IC801) to INPUT (1) V : 2V/div, H : 50 nsec/div DC, 1 : 1 probe DRAM 11.9 –11.2 –11.3 IC803 : PQ025EZ5MZP +2.5V Regulator DC INPUT (VIN) DC OUTPUT (VO) ON/OFF CONTROL (VC) –11.2...
Page 56 DSP-AX620 SCHEMATIC DIAGRAM (INPUT 1/2) P-E71/J69 P-E70/J68 P-E70/J68 P-E70/J68 PHONO MM EQ AMP 10.7 11.2 11.2 RJ-1073F-09-0351A –0.1 –0.1 –11.2 –11.8 –11.1 –10.6 –11.8 11.2 11.2 P-E72/J70 IC301, 303 : LC78211 Analog Function Switch –11.8 –11.8 –0.1 –11.8 L1 1 P-E70/J68 –0.1...
Page 57 DSP-AX620 SCHEMATIC DIAGRAM (INPUT 2/2 & OPERATION 1/2) 11.9 11.9 P-E69/J67 11.9 11.3 –5.7 –5.7 –5.7 –5.7 –5.1 –11.9 –5.1 –20.5 LEVEL CONTROL –28.2 –14.4 –24.5 –24.5 –24.5 –10.9 –27.8 –28.2 –24.8 –24.8 –24.8 –5.1 –24.4 FL DRIVER –27.8 –24.5 –5.1...
Page 58 DSP-AX620 SCHEMATIC DIAGRAM (OPERATION 2/2) SAME PAGE SAME PAGE IC581 : TK15420M VIdeo Amp CIRCUIT CHANGES BY MARKET. X : NOT USED –IN – – –IN INPUT SELECTOR IC588 : LA7109 Ω Video Driver VIN1+ +VCC1 NFB1 VOUT1 MUTE1 VIN2+...
Page 59 DSP-AX620 SCHEMATIC DIAGRAM (MAIN 1/2) P-E71/J69 POWER AMP (L ch) 54.2 54.1 53.8 52.4 53.3 53.3 53.9 53.9 54.2 41.8 35.0 41.8 41.8 53.9 35.1 34.5 35.0 –0.4 35.6 29.8 –1.0 35.6 –0.5 53.1 –0.5 –1.0 –54.2 –1.0 52.6 –54.2 –53.0...
Page 60 DSP-AX620 SCHEMATIC DIAGRAM (MAIN 2/2 & POWER) CIRCUIT CHANGES BY MARKET. O : USED X : NOT USED X : NOT USED CIRCUIT CHANGES BY MARKET. O : USED POWER SUPPLY SAME PAGE 12.5 12.5 12.6 P-E72/J70 SAME PAGE POWER SUPPLY –54.3...
Page 61: Parts List
DSP-AX620 WARNING PARTS LIST Components having special characteristics are marked Z and must be replaced with parts having specifications equal to those originally installed. Carbon resistors (1/6W or 1/4W) are not included in the ELECTRICAL PARTS ELECTRICAL PARTS List. For the parts No. of the carbon resistors, refer to last page.
Page 62 DSP-AX620 P.C.B. INPUT...
Page 63 DSP-AX620 P.C.B. INPUT...
Page 64 DSP-AX620 P.C.B. INPUT & OPERATION...
Page 65 DSP-AX620 P.C.B. OPERATION...
Page 66 DSP-AX620 P.C.B. OPERATION & DSP...
Page 67 DSP-AX620 P.C.B. DSP...
Page 68 DSP-AX620 P.C.B. DSP & MAIN...
Page 69 DSP-AX620 P.C.B. MAIN...
Page 70 DSP-AX620 P.C.B. MAIN...
Page 71 DSP-AX620 P.C.B. MAIN...
Page 72 DSP-AX620 P.C.B. POWER...
Page 73 DSP-AX620 CHIP RESISTOR...
Page 74 DSP-AX620 EXPLODED VIEW B model R,T models models only 9 (5) models only 9 (6) B,G models only 10 (7) 9 (4) G model 3-104 3-101 9 (3) 3-106 3-10 2-101 3-103 3-107 1-25 3-102 1-25 200-1 3-11 2-112 3-102...
Page 75 DSP-AX620 MECHANICAL PARTS...
Page 76 DSP-AX620...
Page 77 DSP-AX620...
Page 78: Remote Control Transmitter
DSP-AX620 REMOTE CONTROL TRANSMITTER 7A15 7A16 7AC9 7AC1 7A54 7A0F 7A14 7A55 7A13 7ACA 7A87 7A18 7A11 7A10 7A85 7A12 7A98 A/B/C/D/E 7A53 7A52 7AC2 7A86 7A9C 7A1D 7A1E 7A1A 7A57 7A1B 7A1C KEY POSITION ONLY "AMP/TUNER" 0003 CODE Function Keychart...
Page 79 DSP-AX620 List of the Yamaha Code (NEC Format) DVD MENU Name Yamaha 0008 Yamaha 0008 Yamaha 0007 Yamaha 0005 Yamaha 0015 7C-94 7C-94 7C-17 79-11 79-11 7C-95 7C-95 7C-18 79-12 79-12 7C-96 7C-96 7C-19 79-13 79-13 7C-97 7C-97 7C-1A 79-14...
Page 80 DSP-AX620 SCHEMATIC DIAGRAM...
Page 81 DSP-AX620 Parts List for Carbon Resistors Value 1/4W Type Part No. 1/6W Type Part No. Value 1/4W Type Part No. 1/6W Type Part No. 1.0 Ω 3100 3100 7100 10 kΩ 7100 HJ35 HF85 HF45 HF45 1.8 Ω 3180 7110 11 kΩ...
Page 82 DSP-AX620...

Yamaha DSP-AX620 Service Manual

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