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3 7 63 1515 0
DSP-A595a
TE
L 13942296513
CONTENTS
TO SERVICE PERSONNEL ........................................... 1
REMOTE CONTROL PANELS ....................................... 1
REAR PANELS ............................................................... 2
SPECIFICATIONS ....................................................... 3~4
INTERNAL VIEW ............................................................ 5
DISASSEMBLY PROCEDURES .................................... 5
SELF DIAGNOSIS FUNCTION ................................ 6~17
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FACTORY PRESET ...................................................... 18
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1 0 0 6 7 8
http://www.xiaoyu163.com
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.
WARNING:
IMPORTANT:
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 exist, please contact the distributor's Service Division.
WARNING:
IMPORTANT:
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http://www.xiaoyu163.com
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AV AMPLIFIER
SERVICE MANUAL
IMPORTANT NOTICE
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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 of 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.
AMP ADJUSTMENT ..................................................... 19
IC DATA .................................................................. 20~30
DISPLAY DATA ........................................................... 31
BLOCK DIAGRAM .................................................. 32~33
PRINTED CIRCUIT BOARD ................................... 34~47
SCHEMATIC DIAGRAM ......................................... 48~53
PARTS LIST ............................................................ 54~67
REMOTE CONTROL TRANSMITTER ......................... 68
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   Summary of Contents for Yamaha DSP-A595a

  • Page 1

    DSP-A595a SERVICE MANUAL 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 specifically YAMAHA L 13942296513 Products, are already known and understood by the users, and have therefore not been restated.

  • Page 2: To Service Personnel, Remote Control Panels

    DSP-A595a 3 7 63 1515 0 TO SERVICE PERSONNEL 1. Critical Components information. Components having special characteristics are marked and must be replaced with parts having specifications equal to those originally AC LEAKAGE installed. WALL EQUIPMENT TESTER OR 2. Leakage Current Measurement (For 120V Model only).

  • Page 3

    DSP-A595a 3 7 63 1515 0 REAR PANELS R model T model L 13942296513 B model G model u163 http://www.xiaoyu163.com...

  • Page 4: Specifications

    DSP-A595a 3 7 63 1515 0 SPECIFICATIONS Residual Noise(IHF-A Network) AUDIO SECTION MAIN L/R, SP OUT 150µV Minimum RMS Output Power Per Channel Channel Separation(Vol. –30dB, EFFECT OFF) (Power Amp. Section) PHONO, Input shorted, 1kHz/10kHz 60dB/55dB MAIN L/R, REAR L/R CD etc, Input 5.1kΩ...

  • Page 5

    DSP-A595a 3 7 63 1515 0 DIMENSIONS WARNING Do not change the IMPEDANCE SELECTOR switch setting while the power to this unit is on, otherwise this unit may be damaged. IMPEDANCE SELECTOR Manufactured under license from Digital Theater Systems, Inc. US Pat. No. 5,451,942 and other wirld- wide patents issued and pending.

  • Page 6

    DSP-A595a 3 7 6 3 1 5 1 5 0 BLOCK DIAGRAM MAIN PHONES MAIN SELECTOR POWER AMP LEVEL IC102 VR401 IC10A IC103 Q506,511,512, IC103 IC351 521,529,Q527A/C IC108B IC401A IC802A INPUT MAIN COAXIAL SELECTOR IC352 H,P,F Q810 Q501 DVD/LD...

  • Page 7: Self Diagnosis Function

    SELF DIAGNOSIS FUNCTION 1. PURPOSE AND OPERATION The DSP-A595a has a Self Diagnosis Function to locate a faulty part, if any, by inspecting and taking measurements. There are 11 main items in the diagnostic menu and some of them have sub-menu items as listed below.

  • Page 8

    DSP-A595a 3 7 63 1515 0 2. BEGINNING AND CANCELLATION (1) STARTING UP THE FUNCTION AND THE DISPLAY After starting up, menu No. 1 is selected. A. How to start diagnostic program Using the front panel keys of the main unit.

  • Page 9

    DSP-A595a 3 7 63 1515 0 FL display at start-up of diagnostic program When the diagnostic program has started, the history (*2) of the protection function (*1) is displayed. If the protection function has been activated in the past, the type and voltage value are displayed. After a few seconds the diagnosis function menu will appear.

  • Page 10

    DSP-A595a 3 7 63 1515 0 3. OPERATION AND DISPLAY WHEN STARTING DIAGNOSIS FUNCTION (1) Selection of diagnostic menu The diagnostic menu and the sub-menu can be selected by using the front panel keys of the main unit or the remote control unit.

  • Page 11

    DSP-A595a 3 7 63 1515 0 4. CONTENTS OF DIAGNOSIS FUNCTION This section describes the contents of the self diagnosis function in detail. No.1 ANALOG THROUGH The input is fixed to analog (A/D). There are two submenus. 1 DVD/LD MAIN BYPAS 1.

  • Page 12

    DSP-A595a 3 7 63 1515 0 No.2 DSP THROUGH The input is automatically discriminated by signal detection and switched with priorities AC-3 (DOLBY DIGITAL)>DTS Digital Surround>Audio>analog. There are the following three submenus. 2 DVD/LD YSS918SRAM 1. YSS918-SRAM MAIN L/R are input to the DSP via AC3D2av, pass through SRAM, and are then output to all channels without being processed.

  • Page 13

    DSP-A595a 3 7 63 1515 0 No.3 AC-3/DTS THROUGH The input is digital signal only. AC-3 (DOLBY DIGITAL) or DTS Digital Surround decoding operation is executed, according to the input source. bit 0 bit 7 3 DVD/LD 3T00000001 1. STATUS(BINARY FORM) AC-3 (DOLBY DIGITAL) decoded signals are output to each channel via AC3D2av.

  • Page 14

    DSP-A595a 3 7 63 1515 0 No.5 SPEAKERS SET The input is automatically discriminated by AC-3(DOLBY DIGITAL)>DTS Digital Surround>PCM Audio>analog. There are the following 9 submenu items: The signal from the DSP block is normally in the effect off status for menu items 1-4.

  • Page 15

    DSP-A595a 3 7 63 1515 0 No.6 DISPLAY CHECK Check program for FL display. The display status will change as follows with submenu operation. The signal is processed with EFFECT OFF. 6 DVD/LD DISP CHECK Initial display All segments turn off...

  • Page 16

    DSP-A595a 3 7 63 1515 0 No.9 AD DATA CHECK The A/D conversion values of the main CPU which detects key scan, protection, etc. are displayed in % (100%: 5V). All signal processing before this menu is executed will be held.

  • Page 17

    DSP-A595a 3 7 63 1515 0 No.10 STATUS FROM DSP MICOM The status data from the DSP microprocessor is sequentially displayed in a hexadecimal number. All signal processing before this menu is executed will be held. STATUS 1st 2nd 3rd 4th...

  • Page 18

    DSP-A595a 3 7 63 1515 0 No.11 CPU VERSION/CHECK SUM/PORT INFO/EXIT DIAG The check sum, version and port setting of main CPU/DSP CPU are displayed. The signal is EFFECT OFF. Operating the submenu will finish self-diagnosis, and ordinary operation mode will be restored.

  • Page 19: Factory Preset

    DSP-A595a 3 7 63 1515 0 FACTORY PRESET All of the system settings are initially set from the factory as follows. INPUT (VIDEO) DVD/LD (DVD/LD) EFFECT LEVEL EFFECT CHANNEL PRESET VALUE CENTER 0 dB RIGHT SURROUND 0 dB LEFT SURROUND...

  • Page 20

    DSP-A595a 3 7 63 1515 0 AMP ADJUSTMENT Confirmation of Idling Current of Main Amplifier • Right after power is turned on, confirm that the voltage across the terminals of R688(Main Lch),R690(Main Rch), R692(Center), R694(Rear Lch), R696(Rear Rch) are between 0.1mVand 5.0mV.

  • Page 21: Internal View, Disassembly Procedures

    DSP-A595a 3 7 63 1515 0 INTERNAL VIEW 1 2 3 4 5 6 1 POWER TRANSFORMER 2 P.C.B. MAIN (3) 3 P.C.B. OPERATION (7) (R, T models only) 4 P.C.B. OPERATION (3) 5 P.C.B. MAIN (4) 6 P.C.B. MAIN (8) 7 P.C.B.

  • Page 22

    DSP-A595a SCHEMATIC DIAGRAM (DSP) TO INPUT(3) CB354 page E-50/J-48 N-8 AK4526A-VQ AK4526VQ DIGITAL Point Pin 13 of IC3 V : 2V/div H : 50nsec/div AC range 1 : 1probe L.P.F 3. 1 2. 4 DSP + DOLBY DIGITAL/ 2. 4 2.

  • Page 23

    DSP-A595a SCHEMATIC DIAGRAM (INPUT) TO OPE(4) CB802 VOLUME AMP FRONT L REAR L page E-52/J-50 H-4 TO DSP CB6 page E-53/J-51 N-4 MAIN L MAIN L MAIN L MAIN L (DSP) (DSP) 11.7 CENTER PHONO(MM) CENTER/SUB WOOFER/FRONT/REAR AMP CENTER EQ AMP 23.3...

  • Page 24

    DSP-A595a SCHEMATIC DIAGRAM (MAIN) REGULATOR MAIN (1),(2),(5),(6) MAIN (3),(4),(7),(8) MAIN POWER AMP 29.4 12.8 43.5 13.4 43.4 43.5(30.2) OUTPUT MAIN POWERAMP 43.5(30.2) MAIN L 43.3 C751 752 8200/56 8200/56 8200/56 (V317930) (VV95180) (VV95180) -0.5 :NOT USED MAIN MUTE -1.1 -11.6...

  • Page 25

    DSP-A595a SCHEMATIC DIAGRAM (OPERATION) S VIDEO IC801, 802 : NJM2068LD Dual OP-Amp VIDEO – – 2 3 4 5 6 • IC800: LC876564A-5M19→See page E-20/J-18~E-22/J-20 AUDIO -22.7 -29.7 OPE(2),(3),(4) TONE CONTROL -11.7 NJM2068LD 11.8 11.8 -19 .6 -11.7 SYSTEM & DSP -8.9...

  • Page 26

    DSP-A595a 3 7 6 3 1 5 1 5 0 SCHEMATIC DIAGRAM (VIDEO) S-VIDEO SELECTOR VIDEO SELECTOR & AMP & AMP VIDEO SIGNAL DVD/LD VIDEO SIGNAL TO INPUT (1) CB101 page E-50/J-48 DVD/LD TV/DBS VIDEO TO OPE (2) S VIDEO...

  • Page 27

    DSP-A595a 3 7 63 1515 0 IC DATA IC800 : LC876564A-5M19 µ 8 bit Main -COM S48/PG0 S19/PC3 S49/PG1 S18/PC2 S50/PG2 S17/PC1 S51/PG3 S16/PC0 VDD3 S15/T15 S14/T14 S13/T13 VSS2 S12/T12 VDD2 S11/T11 TOP VIEW S10/T10 S9/T9 S8/T8 S7/T7 P10/SO0...

  • Page 28

    DSP-A595a 3 7 63 1515 0 IC800 : LC876564A-5M19 µ 8 bit Main -COM Port Function Port Function Name Name FLA-CLK I/O Flash clock 26 P70/INT0 I Power down detect FLA-I/O I/O Flash input/output 27 P71/INT1 O Full mute (L : ON)

  • Page 29

    DSP-A595a 3 7 63 1515 0 IC800 : LC876564A-5M19 µ 8 bit Main -COM Port Function Port Function Name Name 76 S43/PF3 POWER-RY O Power relay 52 S20/PC4 O FL Segment 5 77 S44/PF4 –10dB O –10 dB select (L : –10dB)

  • Page 30

    DSP-A595a 3 7 63 1515 0 IC14 : LC875164A-5K20 µ 8 bit Sub -COM PWM1 SI2P3 SCK2 P17/PWM P16/PWL VSS3 P15/SCK1 VDD3 P14/SI1 P13/SO1 TOP VIEW P12/SCK0 P11/SI0 P10/SOO P87/AN7 P86/AN6 L 13942296513 INTERRUPT CONTROL STANDBY /RES CONTROL CLOCK...

  • Page 31

    DSP-A595a 3 7 63 1515 0 IC14 : LC875164A-5K20 µ 8 bit Sub -COM Port Function Port Function Name Name I Receive data from DIR2 PWM0 OL Unconnected /ICDI O Initial clear for DIR2 VDD2 VDD2 +5V +5V power supply...

  • Page 32

    DSP-A595a 3 7 63 1515 0 IC3 : YM3436DK (DIR2) Digital Format Interface Receiver 24 26 28 25 17 15 14 13 12 31 EXTW DOM0 SYSTEM CLOCK EXTW DOM1 TIMING DDIN DIM0 SYNC GENERATOR DIM1 DDIN TOP VIEW...

  • Page 33

    DSP-A595a 3 7 63 1515 0 IC4 : YSS918D-F (AC3D2av) DSP + AC-3 (Digital Dolby)/Pro Logic/DTS Digital Surround Decoder PVSS SDWCK0 SDWCK1 SDBCK0 SDBCK1 SDIA0 SDOB0 SDIA1 SDOB1 RAMA1 SDOB2 RAMA0 RAMA7 RAMWEN RAMA8 RAMOEN RAMA9 TOP VIEW VDD2...

  • Page 34

    DSP-A595a 3 7 63 1515 0 IC4 : YSS918D-F (AC3D2av) DSP + AC-3 (Digital Dolby)/Pro Logic/DTS Digital Surround Decoder Name Function VDD1 +5V power supply RAMCEN RAM chip enable output terminal (normally unconnected) RAMA16 RAM address output terminal 16, connected to external 1M SRAM address...

  • Page 35

    DSP-A595a 3 7 63 1515 0 IC4 : YSS918D-F (AC3D2av) DSP + AC-3 (Digital Dolby)/Pro Logic/DTS Digital Surround Decoder Name Function VDD2 +3V power supply NONPCM non-PCM data output terminal, non-PCM data detect CRC output terminal (normally unconnected) MUTE...

  • Page 36

    DSP-A595a 3 7 63 1515 0 IC5 : M5M51288BKJ-20LTEL (1M SRAM) 131072-word x 8 bit High Speed Static RAM 131072-word x 8 bit MEMORY ARRAY (512-row X 2048-column) 2048 TOP VIEW COLUMN I/O COLUMN ADDRESS /CE1 DECODER COLUMN INPUT...

  • Page 37

    DSP-A595a 3 7 6 3 1 5 1 5 0 DISPLAY DATA IC6 : AK4526A-VQ (CODEC AD/DA) 20 bit 6 channel A/D, D/A Converter V800 : 16-BT-59GK (V2421800) LIN+ Audio PATTERN AREA LIN– Clock Gen. RIN+ MCLK SDOS VREFL RIN–...

  • Page 38

    DSP-A595a 3 7 6 3 1 5 1 5 0 PRINTED CIRCUIT BOARD (Foil side) P. C. B. DSP P. C. B. DSP TO: INPUT (1) TO: INPUT (3) TO: INPUT (1) LC875164A-5K20 1 3 9 4 2 2 9 6 5 1 3...

  • Page 39

    DSP-A595a 3 7 6 3 1 5 1 5 0 PRINTED CIRCUIT BOARD (Foil side) Semiconductor Location Ref. No. P. C. B. INPUT (1) Location D101 D102 D103 D104 TO: DSP TO: DSP IC101 IC102 IC103 IC104 IC106 IC107...

  • Page 40

    DSP-A595a 3 7 6 3 1 5 1 5 0 PRINTED CIRCUIT BOARD (Foil side) P. C. B. INPUT (3) P. C. B. INPUT (4) P. C. B. VIDEO TO: INPUT (1) W102 –12 +12A LFEO INPUT (1) W101...

  • Page 41

    DSP-A595a 3 7 6 3 1 5 1 5 0 PRINTED CIRCUIT BOARD (Foil side) P. C. B. MAIN (1) B, G models only NFRL NFRR –B B, G only SPRY PRV1 B, G only 1 3 9 4 2 2 9 6 5 1 3...

  • Page 42

    DSP-A595a 3 7 6 3 1 5 1 5 0 PRINTED CIRCUIT BOARD (Foil side) P. C. B. MAIN (7) P. C. B. MAIN (6) P. C. B. MAIN (3) P. C. B. MAIN (4) TO: INPUT (1) TO: MAIN (1)

  • Page 43

    DSP-A595a 3 7 6 3 1 5 1 5 0 PRINTED CIRCUIT BOARD (Foil side) P. C. B. OPERATION (1) Semiconductor Location Ref. No. Location D800 D801 D802 D803 D805 EFFECT /DTS MOVIE MONO ROCK CONCERT D806 SURROUND ENHANCED...

  • Page 44

    DSP-A595a 3 7 6 3 1 5 1 5 0 P. C. B. OPERATION (6) PRINTED CIRCUIT BOARD (Foil side) P. C. B. OPERATION (5) • J, R and T models SWITCHED 100W MAX. TOTAL P. C. B. OPERATION (3)

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