LTO MC250.8 Service Manual
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LTO MC250.8 Service Manual

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MODEL: MC250.8

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Summary of Contents for LTO MC250.8

  • Page 1 MODEL: MC250.8...

  • Page 2: Table Of Contents

    CONTENT 1. INTRODUCTION……………………………………………………………………………..1 2. TECHNICAL SPECIFICATION…………………………………………………………….. 3. BLOCK DIAGRAM……………………………………………………………....3 4. SCHEMATIC DIAGRAM…………………………………………………………………….4 5. WIRING DIAGRAM…………………………………………………………………………12 6. PCB LAYOUT………………………………………………………………………………. 7. TEST PROCEDURE…………………………………………………………....18 8. EXPLODED VIEW & MECHANICAL PARTS LIST……………………………………. 9. BOM………………………………………………………………………………………….25...

  • Page 3: Introduction

    1. INTRODUCTION Innovative design and high stability power amplifier Fan-cooled AB class high power amplifier in 19", 2U size 8 independent channels with separate protection system DC, infrasonic, overheat & short circuit protection Smart-designed protection system for auto re-operation after fault Parallel-input: channel 1 to channel 2, channel 3 to channel 4, channel 5 to channel 6, channel 7 to channel 8 Allowing selection of Stereo, Bridge or parallel operation Ultra low-noise and hum...

  • Page 4: Technical Specification

    2. TECHNICAL SPECIFICATION BRIDGE MODE: 8ohms,1kHz,0.1%THD (EIAJ) 4×500W Distortion(SMPTE-IM) <0.05% MONO MODE: Output Power 8 ohms per channel(EIAJ) 8x180W 4 ohms per channel(EIAJ) 8x250W (20Hz 20kHz THD @ 0.1%) Frequency Response 20Hz-20kHz 1dB, -3dBpoint: 10Hz-60kHz Damping Factor,1kHz,0.1%THD(EIAJ) >300@8ohms Signal to Noise,20Hz-20kHz 90dB Voltage Gain 40×( 32dB)

  • Page 5: Block Diagram

    3. BLOCK DIAGRAM CH5,6,7,8 RELAY PS BRIDGE CH5,6,7,8 FAN PS BRIDGE CH1,2,3,4 RELAY PS BRIDGE CH1,2,3,4 FAN PS BRIDGE - 3 -...

  • Page 6: Schematic Diagram

    4. SCHEMATIC DIAGRAM 0.1uF/50V C1_19 C1_26 100uF/16V 220UF/25V C1_18 10R 3W R1_41 100nF/250V poly C1_17 C1_3 C1_2 220uF/25V 220uF/25V - 4 -...
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  • Page 14: Wiring Diagram

    5. WIRING DIAGRAM CH5GND CH5OUT CH6GND CH6OUT CH7GND CH7OUT CH8GND CH8OUT HB01868 Amplifier CH1~CH4 CH4GND CH4OUT CH3GND CH3OUT CH2GND CH2OUT CH1GND CH1OUT NP35L-Y2 NP35L-Y2 - 12 -...

  • Page 15: Pcb Layout

    6. PCB LAYOUT - 13 -...
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  • Page 19 PCB:MC250.8POWER Bottom Layery Bottom Solder PCB:MC250.8POWER Top Layer Top Overlay Top Solder - 17 -...

  • Page 20: Test Procedure

    7. TEST PROCEDURE The Finished Products Test Test instruments 1). VF analyzer 2). Multimeter 3). Frequency transformer 4). 4Ω（1000W）load resistance*2PCS 5). 8Ω（1000W）load resistance*2PCS 6). Oscilloscope 7). AC protector 1. Initialize: 1) The Power switch turns OFF. 2) Connect the Power cord to AC protector. 3) The Output of frequency converter is 230V/50Hz;...
  • Page 21 Noise<2mV. 7. Filter Test: Set the push switches to FILTER ON and 75Hz FILTER positions (“2” turn on and “3” turn off), set the TIME/DIV knobs of oscilloscope to 10ms position, and set the VOLTS/DIV knobs to 0.5mV position. Input 125Hz/0dB signal, adjust VR of the test fixture and input signal, make sure the output is 5dB, and then adjust the input signal to 75Hz, at this time, the output is 2dB±0.5dB.
  • Page 22 Mono Channel Or Parallel Connection - 20 -...
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  • Page 24: Exploded View&Mechanicalparts List

    8. EXPLODED VIEW&MECHANICALPARTS LIST - 22 -...
  • Page 25 Description Specification 1 HB01868 PCB MC250.8AMP VER060701 2 HB01869 PCB MC250.8POWER_VER060626 3 HB01865 PCB MC250.8VR_VER060320 4 HB01864 PCB MC250.8 Output+Input VER060523 5 HB01867 PCB MC250.8LED_VER060320 6 MA06177 ZC-panel MC250.8_V1.0 7 MA06178 ZC-panel MC250.8 ALTO_V1.0 8 MB04939 ZC-rear board MC250.8_V1.0 9 MI03773 ZC-panel fixed bracketMC250.8_V1.0 10 MI03645 ZB-panel fixed bracket MC250.8_V1.0...
  • Page 26 No. Part No. Description Specification 46 HA04784 header wiring 20P-20P 450mm UL2651#28 PH1.27mm 47 NE16520 ZC-bar code MC250.8 bar code_V1.0 48 HC00005 AC socket AC-008 49 HE00050 fan DV12V/0.37A 80*80*25 360mm JST2P 50 HI00031 power switch R415KKETOF 51 HI00142 manual reset switch...

  • Page 27: Bom

    17 HI00031 power switch-RS R415KKETOF 18 HJ00006 dessicant 19 MA06177 panel-RS MC250.8_V1.0 20 MA06074 panel-RS MC250.8 21 MA06073 panel-RS MC250.8 22.4*81.8*422_V1.0 22 ME00181 iron pillar M3*15*0.5PH_V1.0 23 MJ00088 single light board 1.5*2135*1220 30.67kg 24 AE00055 solvent solvent 25 AE00200 painting 5076...
  • Page 28 No. Part No. Description specification Remark 44 AE00177 paint-RS 4866 45 MI03646 fixed bracket-RS MC250.8 2t*26.5*88.8*446.5L type_V1.1 46 MJ01154 single light board 2.0t*1850*950mm 27.6kg 47 MI03645 fixed bracket-RS MC250.8_V1.0 48 AE00343 solvent No.330 49 AE00177 paint-RS 4866 50 MI03644 fixed bracket-RS MC250.8 2t*26.5*88.8*446.5L type_V1.1...
  • Page 29 105 NH00334 cone paper 0.040*1m 106 NF00061 assurance card ALTO 107 NB03187 carton MAC ALTO_V1.0 108 NB04917 gift carton-RS MC250.8 ALTO_V1.1 109 NF02620 user manual-RS MC250-8 ALTO_V1.1 110 NH00149 paper 889*640mm 111 NB04927 barrier-RS MC250.8_V1.0 112 NI01867 self-adhere foot cushion 20.5*14*7.6mm(SF-006)
  • Page 30 Q1_2,Q1_7,Q2_2,Q2_7,Q3_1,Q3_7,Q4_1,Q4_7 129 MG00252 copper pole M3*6.2*0.5PHsingle,length12 130 MI00700 fixed bracket SA-2000 131 MJ00068 iron board 0.8*2135*1220 16.35kg 132 MI03649 bady-RS MC250.8 313*79*59.5 _V1.1 133 MI03112 heat-sink 59.5*79*1M+5(1M/5.1KG)_V 1.0 134 NC00005 mica SB-9500DSP 18*13*0.1t_V1.0 U1_4 135 ND00204 silicone sleeve-RS-ACT 1*18mm D1_14,D2_14,D2_13,D1_15,D4_11,D4_12,D3_12,D3_13...
  • Page 31 No. Part No. Description specification Remark 170 HB01868 PCB-RS MC250.8AMP_VER060921 D2_3,D1_3,D1_5,D1_4,D1_6,D2_4,D2_6,D3_4,D2_5,D4_ 171 SE00011 SMD rectifier diode RLS4148 0.5A (LL-34) 3, D3_3,D3_2,D4_6,D3_1,D4_5,D4_4 172 CI00095 SMD ceramic capacitor 1206 0.1uF/50V X7R C4_5,C2_9,C3_5,C1_8 173 CI00138 SMD ceramic capacitor 1206 0.22uF/50V X7R ±10% C1_4,C2_7,C4_3,C3_3 174 CI00212 SMD ceramic capacitor1206 0.047uF/50V X7R ±5% C3_4,C4_4,C1_5,C2_8...
  • Page 32 235 MG00252 copper pole M3*6.2*0.5PHsingle,length12 236 MI00700 fixed bracket SA-2000 237 MJ00068 iron board 0.8*2135*1220 16.35kg 238 MI03649 bady-RS MC250.8 313*79*59.5 _V1.1 239 MI03112 heat-sink 59.5*79*1M+5(1M/5.1KG)_V 1.0 240 NC00005 mica SB-9500DSP 18*13*0.1t_V1.0 241 ND00204 silicone sleeve-RS-ACT 1*18mm D1_14,D2_14,D2_13,D1_15,D4_11,D4_12,D3_12,D3_13 242 ND00171...
  • Page 33 No. Part No. Description specification Remark 249 RA00031 metal-oxide-film resistor 2W 10 P type R3_40,R2_39,R4_39,R1_41 250 RA00041 metal-oxide-film resistor 2W 500 P type R3_36,R4_37,R2_37,R1_37 251 RA00071 metal-oxide-film resistor 3W 0.1 RSS P type R3_13,R3_14,R4_14,R2_14,R2_15,R1_15,R1_14,R4_15 252 RA00064 metal-oxide-film resistor 3W 2.0K RSS P type R3_7,R3_6,R1_8,R1_7 253 RH00028...
  • Page 34 No. Part No. Description specification Remark 292 RD00129 SMD fixed resistor 1/4W 0.0 ±5% 1206 R1_6 293 RD00246 SMD precise resistor 1/4W 1.80K ±1% 1206 R3_26,R2_27,R4_27,R1_27 294 RD00245 SMD precise resistor 1/4W 1.00K ±1% 1206 R2_40,R2_41,R4_40,R4_41,R1_60,R3_60 295 RD00515 SMD precise resistor 1/4W 4.7 ±1% 1206 R3_35,R3_34,R1_35,R4_35,R4_36,R1_36,R2_35,R2_36 R4_24,R2_18,R3_23,R3_21,R1_24,R3_22,R2_21,R2_20,...
  • Page 35 C1,C2,C3,C4,C5,C6,C7,C8,C9,C10,C11,C12,C13,C14, 340 CA00125 ceramic capacitor-RS 0.01uF/500V Y5V ±20% C15,C16,C17,C18,C19,C20,C21,C22,C23,C24,C25,C26, C27, C28,C29,C30,C31,C32 341 HK06873 PC board MC250.8 Output+Input 342 HB01864 PCB-RS MC250.8 Output+Input VER060523 343 HC00088 connector(male) 2P 3.9mm 180°(#3921) CN11,CN12,CN13,CN14,CN15,CN16,CN17,CN18 344 HC00343 connector(male) 20P 2.54mm(C03-20-A-3-1) CN19,CN20,CN21,CN22 345 HC00654 terminal block...
  • Page 36 No. Part No. Description specification Remark 371 HI00144 manual reset switch-RS A0701HM-11A 372 MI03683 shelves board-RS MC250.8 4.0t*63.6*23.5_V1.1 373 MJ00070 AL plate 4*2440*1220 32.40kg 374 HC00692 terminal-RS 5ESDVM-03P_V1.0 375 HC00652 terminal-RS 5ESDVM-08P_V1.0 376 NA00122 PE bag 0.04t*350*230mm - 34 -...

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