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JVC RX-7520VBK Service Manual
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JVC RX-7520VBK Service Manual

JVC RX-7520VBK Service Manual

Audio/video control receiver
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Download this manual See also: Instruction Manual
SERVICE MANUAL
AUDIO/VIDEO CONTROL RECEIVER
FM/AM TUNING
STANDBY
STANDBY/ON
SURROUND ON/OFF
FM MODE
SURROUND MODE
PHONES
Contents
Safety precautions --------------------------------------------------------1-2
Importance administering point on the safety --------------------- 1-3
Disassembly method -----------------------------------------------------1-4
Adjustment method -------------------------------------------------------1-9
Description of major ICs -------------------------------------------------1-10~24
RX-7520VBK
RX-7520V AUDIO/VIDEO CONTROL RECEIVER
FM/AM PRESET
FM MODE
MEMORY
INPUT
ANALOG/DIGITAL
BASS BOOST
DVD MULTI
DVD
VCR
INPUT ATT
SPEAKERS ON/OFF
1
2
CD
TAPE/CDR
FM
SOURCE NAME
COPYRIGHT
2002 VICTOR COMPANY OF JAPAN, LTD.
COMPULINK
MASTER VOLUME
ADJUST
SETTING
TV SOUND
CONTROL
DOWN
UP
AM
RX-7520VBK
Area suffix
C ------------------- Canada
Remote
No.21097
Apr. 2002

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Summary of Contents for JVC RX-7520VBK

  • Page 1 RX-7520VBK SERVICE MANUAL AUDIO/VIDEO CONTROL RECEIVER RX-7520VBK Area suffix C ------------------- Canada RX-7520V AUDIO/VIDEO CONTROL RECEIVER FM/AM TUNING FM/AM PRESET FM MODE COMPULINK Remote STANDBY MASTER VOLUME MEMORY STANDBY/ON INPUT SURROUND ON/OFF ANALOG/DIGITAL BASS BOOST ADJUST SETTING FM MODE DVD MULTI...
  • Page 2 RX-7520VBK 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.
  • Page 3 RX-7520VBK Importance administering point on the safety LVA1029-C9 B110 PW104 TA201 B109 B108 B106 Primary part PW105 PW102 TA202 B105 B107 B104 FC211 PW103 6.3A-125V B103 F 201 B102 PW101 B101 FC212 B192 B191 FC232 FC222 B159 Secondary parts F 203...
  • Page 4 RX-7520VBK Disassembly method Top cover Removing the top cover (See Fig.1) Remove the four screws A attaching the top cover on both sides of the body. Remove the three screws B on the back of the body. Remove the top cover from behind in the direction of Fig.1...
  • Page 5 RX-7520VBK Removing each board connected to the rear side of the audio board CN411 (See Fig.5 to 9) Prior to performing the following procedure, remove the top cover and the rear panel. Audio Cut off the tie band fixing the harness.
  • Page 6 RX-7520VBK Removing the audio board (See Fig.10) Relay board Prior to performing the following procedure, remove the top cover and the rear panel. power supply supply Disconnect the card wire from connector CN402 on board board the audio board. CN473...
  • Page 7 RX-7520VBK Removing the power transformer (See Fig.15) Prior to performing the following procedures, remove the top cover. Power Cut off the tie band fixing the harness. supply board board Unsolder the two harnesses connected to the power FW201 transformer. Solder...
  • Page 8 RX-7520VBK Removing the system control board / Operation switch panel Front panel assembly power switch board (See Fig.18 to 20) Prior to performing the following procedure, remove the top cover and the front panel assembly. Pull out the volume knob on the front side of the front panel and remove the nut attaching the system control board.
  • Page 9 RX-7520VBK Adjustment method Tuner section 1. Tuner range 87.5MHz~108.0MHz AM (MW) 530kHz~1710kHz Power amplifier section Adjustment of idling current Measurement location TP301 (Lch) , TP302 (Rch) Adjustment part VR301 (Lch) , VR302 (Rch) Attention This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an internal temperature has risen).
  • Page 10 RX-7520VBK Description of major ICs AK4527BVQP (IC601) : A/D,D/A converter 1.Pin layout Top View 2. Pin function (1/2) Symbol Function SDOS SDTO Source Select Pin (Note 1) "L" : Internal ADC output, "H" : DAUX input OSKS Control Mode Select Pin "L"...
  • Page 11 RX-7520VBK Pin function (2/2) AK4527 Symbol Function Connect to GND ICKS No internal bonding. Analog Input Format Select Pin, Digital Power Supply ADIF "H" : Full-differential input, "L" : Single-ended input Chip Address 1 Pin, Connect to GND CAD1 Chip Address 0 Pin, Connect to GND...
  • Page 12 RX-7520VBK M62446FP (IC428) : 6ch master volume 1.Block Diagram OUT4 DVDD OUT- OUT3 OUT2 DATA PORT volume OUT1 LATCH AVDD DGND volume SWIN AGND GNDS SWout SRin SRout volume SLin SLout GNDC Cout volume Rout GNDR Lout AVSS volume GNDL...
  • Page 13 RX-7520VBK 2.Pin Function M62446FP Pin No. Symbol Function OUT4 BASS BOOST control terminal OUT3 SURROUND control terminal VIDEO 2 control terminal OUT2 OUT1 VIDEO 1 control terminal Analog positive power supply terminal AVDD SW IN SUB Woofer volume signal input terminal A.GND...
  • Page 14 RX-7520VBK MN101C35DJW (IC701) : System controller 1. Pin layout 2. Pin function (1/2) Symbol Function Pin No. VOL.JOG IN_1 VOL.JOG IN_1 VOL.JOG IN_2 VOL.JOG IN_2 DATA (PLL) DATA (PLL) (PLL) (PLL) (PLL) (PLL) VIDEO S/C DVD VIDEO S/C DVD VIDEO S/C VCR...
  • Page 15 RX-7520VBK Pin function (2/2) MN101C35DJW Symbol Function Pin No. (DSP) CLK DSP READY READY (DSP) RESET RESET (DSP) RY S RELAY SURRUND RY C RELAY CENTER RELAY FRONT 1 RY L/R1 RY L/R2 RELAY FRONT 2 RY HP RELAY HEADPHONE...
  • Page 16 RX-7520VBK UPD784215AGC167 (IC671) : Dital signal controller 1.Pin layout 2.Pin function (1/2) Pin No. Symbol Function Non connect Power supply terminal Connecting the crystal oscillator for system main clock Connecting the crystal oscillator for system main clock Connect to GND...
  • Page 17 RX-7520VBK Pin function (2/2) UPD784215AGC167 Pin No. Symbol Function Interface I/O terminal with microcomputer MILP Interface I/O terminal with microcomputer MIACK Non connect Non connect Reset signal output of DSP DSPRST Non connect 54~63 Interface I/O terminal with microcomputer CODEC OUT...
  • Page 18 RX-7520VBK LA1838 (IC102) : FM AM IF amp. & Detector, FM MPX decoder 1. Block Diagram DECODER RF.AMP ANIT-BIRDIE MUTE BUFF STEREO P-DET AM IF PILOT 384KHz COMP S-METER AM/FM S-CLRVE S-METER IF-BUFF TUNING STEREO DRIVE DRIVE FM IF 2. Pin Function...
  • Page 19 RX-7520VBK LC72136N (IC121) : PLL frequency synthesizer 1. Pin layout FM/AM LPFOUT LPFIN CLOCK FM/ST/VCO FMIN AM/FM AMIN IFCONT SDIN IFIN 2. Block diagram Phase Reference Detector Driver Charge Pump Swallow Counter Swallow Counter 1/16,1/17 4bit 1/16,1/17 4bit Unlock Detector...
  • Page 20 RX-7520VBK TC9446F-025 (IC631) : Digital signal processor for dolby digital (AC-3) / DTS audio decode Pin No. Symbol Function Reset signal input terminal (L:reset H: normal operation) Microcomputer interface mode selection input terminal (L:serial H:IC bus) MIMD Microcomputer interface chip select input terminal...
  • Page 21 RX-7520VBK TC9162AF (IC423) : Analog switch 1. Pin layout 2. Block diaglam R-S1 L-S1 R-S2 L-S2 R-COM1 L-COM1 R-S3 L-S3 R-S4 L-S4 R-COM2 L-COM2 R-S5 L-S5 R-S6 L-S6 R-COM3 L-COM3 R-S7 L-S7 R-COM4 L-COM4 DATA SHIFT REGISTER BA15218 (IC451) : Ope. amp.
  • Page 22 RX-7520VBK TC74HC4053AF (IC581) : Multiplecer Contorol inputs INHIBIT Y-COM X-COM Z-COM X: Don't Care. NJM2246D (IC501, 551, 552) : Video switch 1. Pin layout / Block diaglam Vout Vin3 Control input - output signal CTL 1 CTL 2 Output AMP.
  • Page 23 RX-7520VBK TC7SET32FU (IC672) : Z-Input or gate IMX9-W (IC652, IC662, IC682) : Driver 1. Pin layout / Block diagram 1. Pin layout / Block diagram IN B IN A OUT Y TC74HCU08AF (IC611) : Inverter 1. Pin layout / Block diagram 2.The truth value table...
  • Page 24 RX-7520VBK W24L010AJ-12 (IC641) : SRAM 1. Pin layout 2. Block diaglam DECODER CORE ARRAY I/O1 CONTROL DATA I/O I/O8 3. Pin function Pin No. Symbol Function Pin No. Symbol Function No Connection I/O4 Data Input/Output Address Input I/O5 Data Input/Output...
  • Page 25 < M E M O >...
  • Page 26 RX-7520VBK VICTOR COMPANY OF JAPAN, LIMITED AUDIO & COMMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.21097) 200204...

  • Page 27: Block Diagram

    RX-7520VBK Block diagram MONITOR MONITOR DVD FRONT IC451 SELECTOR SELECTOR DVD IN MONITOR TUNER SELECTOR CENTER IC551 RF101 IC121 IC581 VCR REC IC501 IC552 IC582 DVD REAR/ VCR PLAY VCR REC SUB WOOFER AM/FM DET MW RF&OSC VCR P.B. SUB WOOFER...
  • Page 28 RX-7520VBK RX-7520VBK Standard schematic diagrams Power supply section Component video terminal section Power transformer board To sheet 5/8 G-3 FW501 D1501 PW311 11ES2-T4 PW101 J1501 QNN0391-001 CN251 QGA3901F2-03 C1530 1.5ML C1518 C1520 C1522 To sheet 6/8 G-2 F202 R1508 R1510...
  • Page 29 RX-7520VBK Audio & Speaker terminal section To sheet 1/8 D-5 Audio board Speaker board EP301 CN351 C1301 0.1/160 ST302 C1302 QNB0001-002 0.01/500 QQLZ005-R45 D1301 L1351 R1351 RY301 B1005 D1304 QSK109-001 C1303 0.01/500 C1358 220p C1305 C1304 6800/63 6800/63 CN321 GGB2510J1-14...
  • Page 30 RX-7520VBK RX-7520VBK Audio amplirier section Rear amp. board (L) Front amp. board (L) TP301 C819 10/100 R821 R321 C821 C321 R849 Q315 Q805 Q815 R815 R831 KTA1268/GL/ R349 C307 D305 C319 Q819 0.0015 1SS133 Q319 C815 R331 100/63 R829 VR301...
  • Page 31 RX-7520VBK Main section Main section (Volume / Regulator / Source select) To sheet 8/8 E-1 To sheet 7/8 G-3 To sheet 5/8 D-3 To sheet 6/8 C-1 Audio board CN412 CN411 CN421 CN481 CN402 QGB2501J1-12 QGB2510J1-14 QGB2510J1-20 QGF1205C1-25 VGA2501C1-04 CN403...
  • Page 32 RX-7520VBK RX-7520VBK Audio / Video signal input terminal section Audio input board DVD board C408 IC401 100p NJM4580DD C414 R406 R410 R408 C415 470k 4.7/50 47/16 C412 C410 C406 R412 C400 100/10 0.0068MY 0.0018MY 100k 0.022 R409 R407 J401 470K...
  • Page 33 RX-7520VBK Digital signal input terminal / Surround section C627 TP601 J601 K601 R621 NQR0319-001 R622 D609 D610 QNN0347-001 IC621 1/50 1SS355-X 1SS355-X C621 C622 TC74HCU04AF 100p C630 J601 C626 R627 4.7k C629 TP602 C608 R629 R617 R618 IC612 TC74HC4072AF TP509...
  • Page 34 RX-7520VBK RX-7520VBK User control / System control / FL displaying section System control board C709 C707 4.7/50 4.7/50 QRB079J-104 QRB079J-104 RA701 RA702 GRID1 Q707 DTC114Y GRID2 Q708 DTC114Y DI701 QLF0098-001 GRID16 Q709 DTC114Y RDS_CLK R782 RDS_DATA R781 RDS_DAVN R780 CN703...
  • Page 35 RX-7520VBK Tuner section C129 0.001 RF101 C128 C134 QAU0124-002 0.47/50 0.0022 C137 330P C133 22/16 C156 0.001 R157 6.8K Q103 C161 2SC461/BC D129 10/16 R132 D125 1SS133 C162 R103 10/16 R158 6.8K R146 D124 3.9K C126 100P Q102 C139 2SC535/BC R109 0.033...

  • Page 36: Printed Circuit Boards

    RX-7520VBK RX-7520VBK Printed circuit boards Wire protection board Main board Audio input board S Video board Main board 2-10...
  • Page 37 RX-7520VBK System control & Audio board System control board Audio board 2-11...
  • Page 38 RX-7520VBK RX-7520VBK Power amp. board Amplifier board Power trans board Relay board 2-12...
  • Page 39 RX-7520VBK Digital signal input terminal board Forweard side Reverse side 2-13...

  • Page 40: Tuner Board

    RX-7520VBK Tuner board AT101 Q112 B105 D124 [DOM] D125 C107 B198 [DOM] B173 B197 Q103 B123 R108 R109 L111 B194 Q111 R119 C117 C118 C158 R105 R107 B180 R129 C157 B192 R146 C105 C168 B195 B189 B193 C138 C133 R103...

  • Page 41: Parts List

    RX-7520VBK PARTS LIST [ RX-7520VBK ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix C -------------------------- Canada - Contents - 3- 3 Exploded view of general assembly and parts list (Block No.M1) 3- 5 Electrical parts list (Block No.01~05)
  • Page 42 RX-7520VBK < M E M O >...
  • Page 43 RX-7520VBK Exploded view of general assembly and parts list Block No. Power trans board Speaker Power trans board board Component video board Power/Fuse board Relay board Main board Audio board power switch board Power supply board System control board...
  • Page 44 RX-7520VBK RX-7520VBK Parts list (General assembly) Parts list (General assembly) Block No. M1MM Block No. M1MM Item Parts number Parts name Q'ty Description Area Item Parts number Parts name Q'ty Description Area LV10457-018A FRONT PANEL QYSBSGY3008M SPECIAL SCREW 4 INPUT...
  • Page 45 RX-7520VBK Electrical parts list (Power amp board) Block No. 01 Item Remarks Parts number Parts name Area Item Parts number Parts name Remarks Area C 201 QFLC2AJ-104Z M CAPACITOR .10MF 5% 100V C 813 QFLC1HJ-103Z M CAPACITOR .010MF 5% 50V...
  • Page 46 RX-7520VBK Electrical parts list (Power amp board) Block No. 01 Item Parts number Parts name Remarks Area Item Remarks Parts number Parts name Area D 221 1SS133-T2 228ZIODE IM Q 311 KTC3200/GL/-T TRANSISTOR D 301 1SS133-T2 228ZIODE IM Q 312...
  • Page 47 RX-7520VBK Electrical parts list (Power amp board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 314 QRE141J-563Y C RESISTOR 56K 5% 1/4W R 804 QRE141J-563Y C RESISTOR 56K 5% 1/4W...
  • Page 48 RX-7520VBK Block No. 01 Electrical parts list (Power amp board) Item Parts number Parts name Remarks Area R 913 QRE141J-563Y C RESISTOR 56K 5% 1/4W R 915 QRJ146J-331X UNF C RESISTOR 330 5% 1/4W R 921 QRJ146J-100X UNF C RESISTOR...
  • Page 49 RX-7520VBK Electrical parts list (Main board) Block No. 02 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 400 QCBB1HK-223Y C CAPACITOR .022MF 10% 50V CN401 QGB2510K1-14 CONNECTOR C 419 QCBB1HK-223Y C CAPACITOR .022MF 10% 50V...
  • Page 50 RX-7520VBK Electrical parts list (Main board) Block No. 02 Item Remarks Parts number Parts name Area Item Parts number Parts name Remarks Area Q1304 KTC3199/GL/-T TRANSISTOR RY302 QSK0109-001 RELAY Q1305 2SD2395/EF/ TRANSISTOR RY303 QSK0109-001 RELAY Q1306 KTA1023/OY/-T TRANSISTOR RY304 QSK0109-001...
  • Page 51 RX-7520VBK Electrical parts list (System control & Audio board) Block No. 03 Item Remarks Parts number Parts name Area Item Parts number Parts name Remarks Area BK701 LV42093-001A FL HOLDER(L) C1429 QCB31HK-822Z C CAPACITOR 8200PF 10% 50V BK702 LV42092-001A FL HOLDER(R)
  • Page 52 RX-7520VBK Electrical parts list (System control & Audio board) Block No. 03 Item Remarks Parts number Parts name Area Item Parts number Parts name Remarks Area D1409 1SS355-X DIODE C.M Q1432 KRC104M-T D.TR.I.M D1410 1SS355-X DIODE C.M Q1433 KRC104M-T D.TR.I.M...
  • Page 53 RX-7520VBK Electrical parts list (System control & Audio board) Block No. 03 Item Parts number Parts name Remarks Area Item Remarks Parts number Parts name Area R 738 NRSA63J-102X MG RESISTOR R1420 NRSA63J-103X MG RESISTOR R 739 NRSA63J-122X MG RESISTOR...
  • Page 54 RX-7520VBK Electrical parts list (System control & Audio board) Block No. 03 Item Parts number Parts name Remarks Area R1502 NRSA63J-750X MG RESISTOR R1503 NRSA63J-750X MG RESISTOR R1504 NRSA63J-750X MG RESISTOR R1505 NRSA63J-750X MG RESISTOR R1506 NRSA63J-750X MG RESISTOR R1507...
  • Page 55 RX-7520VBK Electrical parts list (DSP board) Block No. 04 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 601 NCB31HK-102X C CAPACITOR C2512 NCF31CZ-104X C CAPACITOR C 602 NCB31HK-102X C CAPACITOR C2513 NCB31HK-122X C CAPACITOR...
  • Page 56 RX-7520VBK Electrical parts list (DSP board) Block No. 04 Item Remarks Parts number Parts name Area Item Parts number Parts name Remarks Area IC662 IMX9-W R 678 NRSA63J-822X MG RESISTOR IC671 UPD784215AGC167 IC(MICRO C ROM) R 679 NRSA63J-822X MG RESISTOR...
  • Page 57 RX-7520VBK Electrical parts list (DSP board) Block No. 04 Item Remarks Parts number Parts name Area R2566 NRSA63J-202X MG RESISTOR R2567 NRSA63J-103X MG RESISTOR R2568 NRSA63J-103X MG RESISTOR R2569 NRSA63J-122X MG RESISTOR R2570 NRSA63J-122X MG RESISTOR R2575 NRSA63J-102X MG RESISTOR...
  • Page 58 RX-7520VBK Electrical parts list (Tuner board) Block No. 05 Item Remarks Parts number Parts name Area Item Parts number Parts name Remarks Area AT101 QNB0014-001 ANT TERMINAL R 115 NRSA02J-104X MG RESISTOR BK 1 LV31618-001A SHIELD BKT R 119 NRSA02J-103X...
  • Page 59 RX-7520VBK < M E M O > 3-19...
  • Page 60 RX-7520VBK Packing materials and accessories parts list Block No. Block No. A2~A8 3-20...
  • Page 61 POLY BAG Parts list (Accessories) Block No. M5MM Item Parts number Parts name Q'ty Description Area RM-SRX7520J REMOCON ------------- BATTERY LVT0852-002A INST.BOOK 1 ENG,FRE EWP503-001C ANT.WIRE QAL0204-001 AM LOOP ANT YU20333 SAFETY INST. BT-52006-1 WARRANTY CARD BT-20071B JVC CENTER LIST 3-21...