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Marantz MM7025 Service Manual
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Marantz MM7025 Service Manual

Marantz MM7025 Service Manual

2 channel power amplifier
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Service
Manual
• For purposes of improvement, specifi cations and design are subject to change without notice.
• Please use this service manual with referring to the operating instructions without fail.
• Some illustrations using in this service manual are slightly different from the actual set.
S0169-1V01DM/DG1010
MM7025
Copyright 2010 D&M Holdings Inc. All rights reserved.
WARNING: Violators will be prosecuted to the maximum extent possible.
MM7025 /
2 Channel Power Amplifi er
N1B/U1B
Ver. 2
Please refer to the
MODIFICATION NOTICE.

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Summary of Contents for Marantz MM7025

  • Page 1 Service MM7025 / N1B/U1B Manual 2 Channel Power Amplifi er • For purposes of improvement, specifi cations and design are subject to change without notice. • Please use this service manual with referring to the operating instructions without fail. • Some illustrations using in this service manual are slightly different from the actual set.

  • Page 2: Ordering Parts

    MARANTZ which it is famous. Parts for your equipment are generally available to our National Marantz Subsidiary or Agent. MARANTZ ORDERING PARTS : Parts can be ordered either by mail or by Fax.. In both cases, the correct part number has to be specifi ed.
  • Page 3 SAFETY PRECAUTIONS The following check should be performed for the continued protection of the customer and service technician. LEAKAGE CURRENT CHECK Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis resistance check.

  • Page 4: Note For Schematic Diagram

    NOTE FOR SCHEMATIC DIAGRAM WARNING: Parts marked with this symbol z have critical characteristics. Use ONLY replacement parts recommended by the manufacture CAUTION: Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the power cord is less than 460 kohms, the unit is defective.

  • Page 5: Technical Specifications

    TECHNICAL SPECIFICATIONS Rated power output 140 W/ch, 8 Ω (from 20 Hz to 20 kHz, two channels 170 W/ch, 6 Ω driven): Maximum effective output power 210 W/ch, 6 Ω (from 1 kHz, two channels driven): Output bandwidth (8 Ω load, 0.09 %): 5 Hz –...

  • Page 6: Top Cover

    DISASSEMBLY • Disassemble in order of the arrow of the fi gure of following fl ow. • In the case of the re-assembling, assemble it in order of the reverse of the following fl ow. • In the case of the re-assembling, observe "attention of assembling" it. TOP COVER FRONT PANEL ASSY MAIN PCB ASSY(2)

  • Page 7: Special Mode

    SPECIAL MODE Special mode setting button s b Enters the special mode when A button is pressed in normal power state. Mode Button A Contents CPU version displayed. Service mode Service Furthermore,this unit in a condition of the following by pushing the Button A. 1-1 Protection Log display Service Displayed protection history.
  • Page 8 1. CPU Version check The fi rmware version is displayed on LEDs as follows. V1(D407) V2(D406) V3(D405) Version Ver1 Ver2 Ver3 Ver4 Ver5 Ver6 Ver7 1.1. Protection Log display The last time protection log is displayed on LEDs as follows if the Service button is pushed(>5sec) in the Service mode.
  • Page 9 2. Cooling FAN active The fan rotates according to the condition of the temperature sensor(IC409) as follows. T :IC409 temperature Fan rotate T < 0°C STOP 0°C ≦ T < 10°C Rotate Low speed 10°C ≦ T Rotate High speed 2.1.

  • Page 10: System Error

    3. SYSTEM ERROR The reason for the error can be presumed from Standby LED display when the error occurs and protection log display. Refer to [1-1.] for the method of confi rming protection log. If the AC power supply is turned off, the state of all protection can be released. Protection log display Error Detection...

  • Page 11: Version Upgrade Procedure Of Firmware

    • The target devise is internal fl ash ROM of microprocessor (IC402) on CPU PWB (12336Z-A). • The updating of software takes about 20 seconds. • The software is common by MM7055 and MM7025. Necessary Equipment The following items are required for updating.
  • Page 12 (6) Double click the CPU (MM7055_7025) folder. (7) Double click the FlashSta.exe. And launch the M16C Flash Start. (8) Check the internal fl ash memory in the Select Program. Choose the COM Port number. And the click OK.
  • Page 13 (9) Click the Refer..(10) Choose the MM7055_7025_yymmddvv.mot. And click Open. NOTE : The yy is two digit of year. The mm is month. The dd is date. The vv is version. (11) The FilePath and ID are inputted automatically, and the MCU Type is selected to R8C automatically. Click the OK.
  • Page 14 (12) Click the Setting..(13) Choose the 57600 in the Baud rate. (DO NOT choose the other one.) Choose the 40 in Program_intervals(ms). Click the OK.
  • Page 15 (14) Click the E.P.R..(15) Click the OK. (16) Software is written into the internal Flash-ROM of CPU. The updating of software takes about 20 seconds.
  • Page 16 (17) Click the OK. (18) Click the Exit. (19) Disconnect the mains cord from the unit. (20) Disconnect the RS-232C cable from the unit.

  • Page 17: Left Side

    ADJUSTMENT Idling Current Alignment (1) Each of the measurement points are provided with the two test points. Set a digital Voltage meter to DC voltage input, connect the meter to the test points at both contact points. (2) After the setup above, turn on the main switch. (3) Adjust variable resistors (VR11,VR12) according to the digital voltmeter readings.

  • Page 18: Troubleshooting

    TROUBLE SHOOTING 1. POWER 1.1. Power not turn on Power not turn on. When the AC line turned on, does the Is a DC 5V voltage supplied from the ON/STANDBY indicator on the front Confi rm +5V regulator(IC32) circuit. STANDBY PCB to the μ-com? panel light? Is the "P_DOWN"...
  • Page 19 2. AUDIO 2.1. No audio output No audio output Is the signal input terminal(Bal or IChange the input selector SW to Unbal) and the Input selentor SW correct setting. setting suitable? Is the speaker relay(RY15) operate Confi rm ±21V power supply and normary? control line"SPK ON1"(CN41-7pin).
  • Page 20 2.2. Power Amp (MAIN PWB) No audio output (caused by power amp) Is the power transistor open or short circuit? Replace the power transistor. 2SC2922/2SA1216 Is the emitter resistance of the power transistor open? Replace the emitter resistance. (0.10Ω) Is the base resistance of the power transistor open? Replace the base resistance.

  • Page 21: Block Diagram

    BLOCK DIAGRAM Audio Block AMP PART INPUT PART AMP_B PART +29dB +12V UNBAL +29dB +18V AMP_A PART +29dB FL_LEVEL +12V +29dB FR_LEVEL SPK_ON1 +29dB SL_LEVEL PO100-1 PO100-2 PO100-3 SR_LEVEL DC_AMP +12V POSISTOR POSISTOR POSISTOR UNBAL SPK_ON1 _HEAT_DET_1 _HEAT_DET_2 _HEAT_DET_3 CURR_AMP CNT_LEVEL +VCC LM94022BIMG...

  • Page 22: Level Diagram

    LEVEL DIAGRAM UNBAL INPUT SPEAKER OUTPUT BAL INPUT AMP IN SPK OUT LINE IN ; 2V 28.2V UNBAL ; 1V +40dB +40dB +30dB +30dB +29dB +20dB +20dB +10dB +10dB BAL IN -6dB UNBAL IN -10dB -10dB -20dB -20dB -30dB -30dB -40dB -40dB...

  • Page 23: Printed Wiring Boards

    PRINTED WIRING BOARDS MAIN (1) (COMPONENT SIDE) 鉛フリー半田 半田付けには、鉛フリー半田 (Sn-Ag-Cu) を使用してください。 Lead-free Solder When soldering, use the Lead-free Solder (Sn-Ag-Cu).
  • Page 24 MAIN (2) (COMPONENT SIDE) MAIN (3) (COMPONENT SIDE) STANDBY (COMPONENT SIDE) FRONT (1) (COMPONENT SIDE) FRONT (2) (COMPONENT SIDE) FRONT (3) (COMPONENT SIDE) 鉛フリー半田 半田付けには、鉛フリー半田 (Sn-Ag-Cu) を使用してください。 Lead-free Solder When soldering, use the Lead-free Solder (Sn-Ag-Cu).
  • Page 25 CPU (COMPONENT SIDE) CPU (FOIL SIDE) 鉛フリー半田 半田付けには、鉛フリー半田 (Sn-Ag-Cu) を使用してください。 Lead-free Solder When soldering, use the Lead-free Solder (Sn-Ag-Cu).
  • Page 26 CPU PART MM7025 MM7055 R465 OPEN 100K R464 OPEN 100K R474 JUMPER OPEN R475 JUMPER OPEN 0.1uF C426 0.1uF C427 0.1uF C428 +5VL +3.3VL +5VL IC404 Q400 +12V 13.+12V R431 220 RPM6936 KRA102 IC401 NJM2831F33 R433 R434 +5VL 12.+5VL R432 220...

  • Page 27: Schematic Diagrams

    MM7025 ST-BY LED PCB FRONT PCB CUP12337Z-4 CUP12337Z-1 (PWR_button key) +5VD +5VL +5VD +5VL1 R901 SW91 Q901 Q902 1.PWR_BTN 1.PWR_BTN KRA102M Q903 Q904 Q905 Q906 KRA102M KRA102M KRA102M KRA102M KRA102M 2._ST BY_LED 2._ST BY_LED 3.+5VL 3.+5VL +5VL1 +5VL 4.CPU_GND 4.CPU_GND +5VL1 5.CPU_GND...
  • Page 28 R202 UNBALANCE INPUT PART 10(2W) MAIN PART C171 Q130 Q131 Q132 JK11 KTC3423Y 2SC4883A 2SC2922YP C103 R101 AGND KTA1268 C109 R107 22/50V Q123 C105 Q137 +16V 22/25V +38V R175 KTA1268 (ROA) Q124 IC11 AGND OPEN NJM2068DD KTA1360Y 1.5K(2W) CURR_AMP CURR_AMP -VCC -15V Q136...
  • Page 29 SPEAKER OUT PART 10(1W) R313 JK15 0.5uH L101 -12V R317 470(1W) FLGND C247 0.1uF JK16 FRGND RY15 +13V 10(1W) R314 0.5uH L102 C249 0.1uF FLGND FRGND KTA1267Y Q162 R319 10K Q161 HVTKRC102MT SPK_ON1 -21V +21V R324 +18VP_GND R325 +18VP R326 D152 FR_LEVEL 1SS133M...
  • Page 30 ST-BY PCB D354 13.P_CON CVD1SS355T IC31 12.CPU_GND S-80842CNY-X D351 R353 11.P_DOWN 1N4003SR 10.NC 9.STANDBY1 D352 8.+5VL 1N4003SR 7.CPU_GND IC32 NJM2831F5 *OPTION T100 6.+5VD D355 VOUT 5.+12V 1N4003SR D356 4.+18VP_GND 1N4003SR D357 3.+18VP 1N4003SR 2.+18VA_GND D358 1.+18VA 1N4003SR FB Ver. CLT5I008ZJ U1B Ver.

  • Page 31: Wiring Diagram

    WIRING DIAGRAM UNBAL INPUT JACK SPEKER TERMINAL CN11(7P) CN13(5P) UNBAL IN(2.0mm) SPK OUT(3.96mm) *OPTION GUIDE PCB BALANCED JACK 100/120V 230V CN41(13P) CPU PCB MAIN(2.0mm) BN41(11P) MAIN(2.0mm) CN43(13P) CN42(11P) BN12(13P) ST-BY(2.0mm) FRONT(2.0mm) MAIN(2.0mm) CN12(11P) MAIN(2.0mm) CN32(2P) AC-IN(7.92mm) ST-BY PCB BN6(1P) FROM BN3 S3 POWER MAIN TRANS CN33(5P)

  • Page 32: Exploded View

    EXPLODED VIEW WARNING: Parts marked with this symbol have critical characteristics. Use ONLY replacement parts recommended by the manufacturer.

  • Page 33: Parts List Of Exploded View

    PARTS LIST OF EXPLODED VIEW zParts for which "nsp" is indicated on this table cannot be supplied. zP.W.B. ASS'Y for which "nsp" is indicated on this table cannot be supplied. When repairing the P.W.B. ASS'Y, check the board parts table and order replacement parts. zPart indicated with the mark "...
  • Page 34 Ref. No. Part No. Part Name Remarks Q'ty 00M14AJ057210 LEGS SL CKL1A199H46 00M14AJ056110 LEGS CUSHION CHG1A451 RUBBER CHG1A113 CUSHION, MAIN TRANS CHG1A487 CUSHION CHG1A488 PCB SUPPORT CRE1A087 SUPPORT, FAN CMH1A312 CUSHION CHG3A104 LOCKER CRE1A037 SHEET, PROTECTOR CMC1A409Z SHEET, COVER CHS1A154 ★...

  • Page 35: Packing View

    PACKING VIEW PARTS LIST OF PACKING & ACCESSORIES zParts for which "nsp" is indicated on this table cannot be supplied. zPart indicated with the mark " ★ " is not illustrated in the exploded view. zThe parts listed below are for maintenance only, might differ from the parts used in the unit in appearances or dimensions. Note: The symbols in the column "Remarks"...
  • Page 36 SEMICONDUCTORS Only major semiconductors are shown, general semiconductors etc. are omitted to list. The semiconductor which described a detailed drawing in a schematic diagram are omitted to list. 1. IC's R5F21246SNFP (IC402) Pin assignments (top view) P0_6/AN1 P1_3/KI3/AN11 P0_5/AN2 P1_4/TXD0 P0_4/AN3 P1_5/RXD0/(TRAIO)/(INT1) P4_2/VREF...
  • Page 37 R5F21246SNFP Block Diagram I/O ports Port P0 Port P1 Port P2 Port P3 Port P4 Port P6 Peripheral functions System clock A/D converter generation circuit (10 bits 12 channels) Timers XIN-XOUT High-speed on-chip oscillator Timer RA (8 bits) Low-speed on-chip oscillator Timer RB (8 bits) UART or XCIN-XCOUT...
  • Page 38 Port STBY Port Spec Act. Init Port Name Ext. R Description Setting setting MODE P26/TRDIOC1 SPK_ON2 47kPD NO USE P25/TRDIOB1 SPK_ON3 47kPD NO USE Protection LED ON/OFF P24/TRDIOA1 Protection LED DTrPU LED ON:L/ OFF:H Version display LED bit3(MSB) P23/TRDIOD0 V_LED3 LED ON:L/ OFF:H Version display LED bit2 P22/TRDIOC0...
  • Page 39 Port STBY Port Spec Act. Init Port Name Ext. R Description Setting setting MODE _STANDBY1 10kPD Standby Control 1 _STANDBY2 10kPD Standby Control 2 Sensor "Power AMP Heat detection 1 P03/AN4 _HEAT_DET_1 100kPD Voltage (NS LM94022)" P02/AN5 _AVSS_DET 10kPU Power AMP AVSS Level detection "Power Supply H/L switch P01/AN6 AVSS_OUT...

  • Page 40: Serial Eeprom

    AT24C04BN-SH-B (IC403) Features • Low-voltage and Standard-voltage Operation – 1.8 (V = 1.8V to 5.5V) • Internally Organized 512 x 8 (4K), or 1024 x 8 (8K) • Two-wire Serial Interface • Schmitt Trigger, Filtered Inputs for Noise Suppression • Bidirectional Data Transfer Protocol •...
  • Page 41 LM94022BIMG (IC409) December 6, 2007 LM94022/LM94022Q 1.5V, SC70, Multi-Gain Analog Temperature Sensor with Class-AB Output Disk Drives General Description Games The LM94022 is a precision analog output CMOS integrated- Appliances circuit temperature sensor that operates at a supply voltage as low as 1.5 Volts. A class-AB output structure gives the Features LM94022 strong output source and sink current capability for driving heavy loads.
  • Page 42 2SC2922 Y (Q132,Q152) 2SC2922 LAPT Silicon NPN Epitaxial Planar Transistor Application : Audio and General Purpose (Complement to type 2SA1216) External Dimensions MT-200 ■ ■ Absolute maximum ratings (Ta=25°C) Electrical Characteristics (Ta=25°C) 2SC2922 Symbol Symbol Unit Conditions 2SC2922 Unit ±0.2 36.4 ±0.3 μ...
  • Page 43 2SA1216 Y (Q135,Q155) 2SA1216 LAPT Silicon PNP Epitaxial Planar Transistor (Complement to type 2SC2922) Application : Audio and General Purpose ■ ■ External Dimensions MT-200 Absolute maximum ratings Electrical Characteristics (Ta=25°C) (Ta=25°C) Symbol 2SA1216 SymboI 2SA1216 Unit Conditions Unit ±0.2 36.4 ±0.3 μ...

  • Page 44: Parts List Of P.c.b. Unit

    PARTS LIST OF P.C.B. UNIT zParts for which "nsp" is indicated on this table cannot be supplied. zThe parts listed below are for maintenance only, might differ from the parts used in the unit in appearances or dimensions. Note: The symbols in the column "Remarks" indicate the following destinations. U1B : North America model N1B : Europe model MAIN PCB ASS'Y...
  • Page 45 Ref. No. Part No. Part Name Remarks Q'ty Q162 00MHT600111B0 TRS. KTA1267Y HVTKTA1267YT Q163 00MHT30001000 TRS. KTC3199Y HVTKTC3199YT Q164 00MBA20001000 TRS. KRC102M HVTKRC102MT Q165 90M-BA001450R TRS. KRA107M HVTKRA107MT Q166,167 00MBA20001000 TRS. KRC102M HVTKRC102MT Q168 00MHT30001000 TRS. KTC3199Y HVTKTC3199YT Q169-172 00MBA20001000 TRS.
  • Page 46 Ref. No. Part No. Part Name Remarks Q'ty R235 RES. 120 OHM 2W METAL OXIDE FILM CRG2SANJ121RT R236 943124011650S RES. 470 OHM 1/4W FLAME RETARDANT CRG14SANCJ471T R242 943124011650S RES. 470 OHM 1/4W FLAME RETARDANT CRG14SANCJ471T R245 RES. 1K 1/4W 5% FLAME RETARDANT CRG14SANCJ102T R247,248 RES.
  • Page 47 Ref. No. Part No. Part Name Remarks Q'ty C157 CER. CAP. 0.1UF 50V Z CERAMIC CCBS1H104ZFT C158 00MOA10605020 ELECT CAP. 10UF 50V CCEA1HH100T C159 CER. CAP. 0.1UF 50V Z CERAMIC CCBS1H104ZFT C160 CER. CAP. 1000PF 50V B CERAMIC CCBS1H102KBT C161 00MOA22605020 ELECT CAP.
  • Page 48 Ref. No. Part No. Part Name Remarks Q'ty C246 CER. CAP. 100PF 50V KB CCKT1H101KB C247 CER. CAP. 0.1UF 50V ZF CCFT1H104ZF C248 CER. CAP. 100PF 50V KB CCKT1H101KB C249 CER. CAP. 0.1UF 50V ZF CCFT1H104ZF C331,332 FILM CAP. 0.039UF 100V J MYLAR HCQI1H393JZT C333,334 CER.
  • Page 49 STANDBY PCB ASS'Y Ref. No. Part No. Part Name Remarks Q'ty SEMICONDUCTORS GROUP IC31 90M-HC108410R IC S-80842CNY-X HVIS-80842CNY-X IC32 90M-HC900200R IC NJM2831F05 CVINJM2831F05 IC33 00MHC3890509F IC NJM7805FA HVINJM7805FA IC35 00MHC3891809F IC NJM7818FA CVINJM7818FA IC72 00MHC3891209F IC NJM7812FA HVINJM7812FA Q351 00MHT600111B0 CHIP TRS.
  • Page 50 Ref. No. Part No. Part Name Remarks Q'ty z RY31 943682004660S RELAY ! RELAY G5PA-1 DC6V CSL1E002ZE z T100 943101011370S TRANSFORMER SUB EI 28*16 CLT5I008ZU z T100 00D9430193203 TRANSFORMER SUB EI 28*16 CLT5I008ZE HEAT SINK CMY1A223 HEAT SINK CMY3A025 SCREW CTB3+8JR...

  • Page 51: Cpu Pcb Ass'y

    CPU PCB ASS'Y Ref. No. Part No. Part Name Remarks Q'ty SEMICONDUCTORS GROUP IC401 00D2631242905 IC NJM2831F33 CVINJM2831F33 IC402 943243001000M IC U-COM R5F21246SNFP CVIR5F21246SNFP IC403 943236000650S IC AT24C04BN-SH-B CVIAT24C04BNSHB NOTE : When update Firmware, IC404 90M-HW100690R PHOTO UNIT RPM674CBR-S CRVRPM6936 please confi...
  • Page 52 Ref. No. Part No. Part Name Remarks Q'ty CN43 CONN. 7STRAIGHT WAFER , 2MM CJP13GI236ZW CN44 CONN. 7P WAFER CARD CABLE CJP07GB113ZY CN45 CONN. 7P WAFER CJP07GA117ZY D400 90M-HI200020R L.E.D. SIR-34ST3F BVDSIR34ST3F D401 00MHZ21303210 DIODE 1SS355 CVD1SS355T D402 90M-HD201750R DIODE 1N4003 CVD1N4003SRT D403,404 00MHZ21303210...

  • Page 53: Front Pcb Ass'y

    FRONT PCB ASS'Y Ref. No. Part No. Part Name Remarks Q'ty SEMICONDUCTORS GROUP Q901-906 00MBA10001000 TRS KRA102M HVTKRA102MT D901 263710016400S LED SLI-325URT31W TP CVDSLI325URT31WT055 D902-905 90M-HI101190R LED BLUE LED TOL-52CSBBCEAB2 CVD52CSBBCEAB2 D906,907 263710016400S LED SLI-325URT31W TP CVDSLI325URT31WT055 D908 90M-HI101190R LED BLUE LED TOL-52CSBBCEAB2 CVD52CSBBCEAB2 CAPACITORS GROUP C901...

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