Alto PBM4 Service Manual
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Alto PBM4 Service Manual

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MODEL: PBM4
MODEL: PS 4LA
www.altoproaudio.com
Version 2.0

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Summary of Contents for Alto PBM4

  • Page 1 MODEL: PBM4 MODEL: PS 4LA www.altoproaudio.com Version 2.0...

  • Page 2: Table Of Contents

    CONTENT 1. Function Introduction… … … … … … … … … … … … … … … … … … … … … … … .2 2. Specification… … … … … … … … … … … … … … … … … … … … … … … … … … … .2 3.

  • Page 3: Function Introduction

    1. Function Introduction The PBM4 is professional monitor. It is packed with some key features. For example: there is four MIC/LINE inputs which provided with ultra low noise microphone pre-amplifiers and phantom power at +15V, each of them features a 2-band equalizer, one AUX send and level control. FX MAIN/MONITOR outputs,16-position multi-effect and soon.

  • Page 4: Block Diagram

    3. Block Diagram...

  • Page 5: Schematic Diagram

    4. Schematic Diagram...
  • Page 6 7 BAND EQ MAIN SECTION DSP SECTION PBM4-MX_4.SCH PBM4-MX_2.SCH PBM4-MX_3.SCH Titel 100N 100N 100N 100N 100N 100N 100N 100N PBM4 INPUT SECTION -VCC Size Model No: Revision PBM4 V1.0 8-Jan-2005 Date: Sheet 1 of File: PBM4-MX_1.Sch Drawn By: SHUNG LIN...
  • Page 7 C122 MAIN-BUS R151 4U7/63V(NP) VR17 3K9/0805 100P 100P W50K CGND CGND CGND R181 +PHANTOM Titel 470R 1/2W PBM4 MAIN & OUTPUT SECTION SCJ-0658-1-Y C146 FOOTSW 470uF/50V 6P-SL2020 CGND Size Model No: Revision CGND PBM4 8-Jan-2005 CGND Date: Sheet 2 of File: PBM4-MX_2.Sch...
  • Page 8 U16B C133 10UF/25V 220U/16V 10UF/25V U18F NE555 74HC14 4580M 4580M 74HC14 C110 C112 R162 100N 100N DGND DGND DGND -VCC Titel PBM4 DSP SECTION Size Model No: Revision PBM4 8-Jan-2005 Date: Sheet 3 of File: PBM4-MX_3.Sch Drawn By: SHUNG LIN...
  • Page 9 MON_EQ_SOURCE 100N RF9_1 UF2C UF3C UF4C MON_EQ_OOL_2 RF9_4 4580V 4580V 4580V RF9_3 C137 100N -VCC RF9_7B W100K RF9_2 CF9_2 Titel PBM4 7 BANE EQ Size Model No: Revision PBM4 Date: 8-Jan-2005 Sheet 4 of File: PBM4-MX_4.Sch Drawn By: SHUNG LIN...

  • Page 10: Wiring Diagram

    5. Wiring Diagram...

  • Page 11: Pcb Layout

    6. PCB Layout (1) PCB: PBM4-MX BOTTOM LAYER PCB: PBM4-MX BOTTOM LAYER...
  • Page 12 PCB: PBM4-MX BOTTOMOVERLAY...
  • Page 13 0 0 0 0 0 0 0 0 0 0 0 00 0000 0000 PCB: PBM-MX TOP LAYER...
  • Page 14 PCB: PBM-MX TOPOVERLAY...
  • Page 15 (2) PBM4-AMP PCB: PBM4-AMP BOTTOMOVERLAY PCB: PBM4-AMP BOTTOM LAYER...
  • Page 16 PCB: PBM4-AMP TOP LAYER PCB: PBM4-AMP TOPOVERLAY...
  • Page 17 (3) 313123/2 PCB: 313123/2 TOP LAYER PCB: 313123/2 BOTTOM LAYER PCB: 313123/2 TOPOVERLAY...

  • Page 18: Test Procedure

    7. Test Procedure...
  • Page 19 (1) AP output: 0dBu 1KHz SINE(sine wave), load out 600Ω Bal-Float. (2) AP input: Load 100KΩ BNC-Unbal. BW: 22Hz~22KHz. Fltr: A-weighting(12017) 3. Visual check Inspect the appearance of PBM4. Ensure it is ok; the knob of the potentiometer should be no friction. 4. Test function (1) Test the Phantom power The power indicator lights up when you switch on PBM4.
  • Page 20 MAIN OUT: –7dBu(±3dBu), distortion <0.05%. MONTOR OUT LEFT: -2dBu(±3dBu), distortion <0.05% FX SEND: –7dBu(±3dBu), distortion <0.003% TAPE OUT: –7dBu(±3dBu), distortion <0.05% (4) Test the output signal of CH5/6, when input mono signal to LEFT IN. A. Set the LEVEL knobs of CH5~CH6 to the middle position MAIN OUT: –21dBu(±3dBu), distortion <0.1%.
  • Page 21 A. Input the signal of 1KHz,-20dBu from MIC jack with Balanced. Output level data is similar to LINE IN input . B. When press the DSP switch, MUTE CHIP lamp should be up or down. Connect FOOT switch. MUTE CHIP should be up or down. C.
  • Page 22 Turn the EQ knob of all channels to the middle position after finishing test. (9) Test the curve of MAIN EQ A. Respectively input signal 0dBu, 1KHz to a channel from CH1~CH4. Set all slide potentiometers of MAIN EQ to the middle position. Adjust LEVEL of the corresponding channel to make MAIN ON is 0dBu.
  • Page 23 repeat twice or thrice, eliminate unwanted noise during test and the output should be changed accordingly. Turn on/off the switch twice, it should be no noise. Company preset: Turn all LEVEL knobs to the minimum. Set the PHANTOM switch to OFF position and other knobs to the middle position.
  • Page 24 SEKAKU ELECTRON INDUSTRY CO., LTD. PAGE: 1 Test Result JFM-1006-5.0 Model No:PBM4-AMP Test Date: 2005/01/17 Test Item Test Conditions Spec Test Result Remark Power Source AC: 240 V； 50 Hz Motionless State DC______V Load_____Ω ________A ________A Current _______A _______A Power Rated Output.
  • Page 25 SEKAKU ELECTRON INDUSTRY CO.,LTD PAGE: 2 Test Result JFM-1006-5.0 Model No:PBM4 Test Date:2005/01/17 Tester： 4. Distortion at 5. Frequency Test Item 1. Input Sensitivity 2. Signal/Noise 3. Distortion at 1W Rated Response Test Conditions FLAT Rated FLAT Rated FLAT Output...

  • Page 26: Exploded Views & Mechanical Parts List

    8. Exploded Views & Mechanical Part List...
  • Page 27 Part No. Description Specification NI03241 Panel 318*194*30 black_V1.0 NI01957 Rear cover PAM5 MG00550 Screw M4*35 MG00370 Screw M8*14.2*1.25PH ME00094 M8*1.25PH MF00097 Washer φ32*φ9*2t PAM-5 MG00387 Screw M3*20 MG00051 Screw M3*16 HK05013 Panel PBM4-MX HK05111 Panel PBM4_230V MG00465 Screw M8*9.5*1.25PH...

  • Page 30: Bom

    0.035*1M 17 MG00051 screw M3*16 18 NF00061 assurance card ALTO 19 NA00125 PE bag 0.04t*580*400mm 20 NB03358 gift carton PBM4 ALTO_V1.0 21 NB03246 carton PAM5;PAM5A;PAM5T_V1.0 22 NB03374 cushion PBM4 down_V1.0 23 NB03375 cushion PBM4 up_V1.0 24 HJ00006 desiccant 25 HK05013...
  • Page 31 W50KΩ RD09F113A224-50K4BT(SAS1);30F-C VR3,VR4,VR7,VR8,VR11,VR12,VR15,VR16,VR21,VR22 65 SA00054 L.E.D 3m/m round(yellow)long foot 26 66 NI01786 LED spacer support LEDS-12 12mm 67 HK05039 PC board P-PBM4-MX-AI 100Ω 68 RA01112 fixed resistor 1/4W R32,R149,R150 100uF/25V φ6*11mm 69 CB00235 electrolytic capacitor C135 10uF /25V φ4*7mm...
  • Page 32 No. Part No. Description Specification Remark 1.2KΩ ±5% 0603 92 RD00084 RF2-2 SMD fixed resistor 1/10W 1.5KΩ ±5% 0603 93 RD00085 SMD fixed resistor 1/10W R129 1.8KΩ ±5% 0603 94 RD00086 SMD fixed resistor 1/10W RF4-2 95 RD00125 1.0MΩ ±5% 0603 SMD fixed resistor 1/10W R105,R106,R107,R108,R109,R110, R111,R156 96 CI00065...
  • Page 33 RLS4148 0.5A (LL-34) 158 SG00068 SMD integrated circuit 74HC14DT(SO-14)/(PHI) 159 SG00410 SMD integrated circuit IC41LV16256-35KG(SOJ40)/(ICSI) 160 SG00166 SMD integrated circuit TY-2 ALTO(GMCODE:105022) 161 SG00147 SMD integrated circuit CHEF DSP(GMCODE:105022) 162 SG00037 SMD integrated circuit LD1117DT33C(TO-252) 163 HC00233 IC socket (PCB) PLCC32 (D03-32T.A.4)
  • Page 34 0.0047uF/100V 5% CASE01 C39,C40,C41,C42,C43,C44,C45,C46 metal-film capacitor MSC 186 NI02957 knob 9.8*5.5*11.2mm black_V1.0 187 HK05111 PC board PBM4_230V 188 MA05448 panel PBM4 230V 50/60Hz CHINA ALTO_V1.2 189 MA00440 panel PBM4S 4.0t*242.5*95.5 190 MA00437 panel PBM4S 4.0t*242.5*95.5_V1.2 191 MJ00218 panel 4.0t*242.5*95.5 PAM5A 192 HI00021...
  • Page 35 263 NE05267 label 264 NH00025 bond paper 0.065*1M 265 NI00018 membrane 0.06*1M 266 MG00465 screw M8*9.5*1.25PH 267 NF02055 instruction PBM4 ALTO_V1.0 268 NH00231 paper 889*554mm 269 NE02717 label MADE IN CHINA 270 NH00038 paper 0.115*1M 271 NI00028 membrane 0.110*1M...

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