Alto PBM8.500 MKII Service Manual

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MODEL: PBM8.250 MKII

PBM8.500 MKII

www.altoproaudio.com

Version 1.0

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Page 1 MODEL: PBM8.250 MKII PBM8.500 MKII www.altoproaudio.com Version 1.0...
Page 2: Table Of Contents
CONTENT 1. Introduction…………………………………………………………………….1 2. Specification…………………………………………………………………...2 3. Block Diagram…………………………………………………………………4 4. Schematic Diagram…………………………………………………………...5 5. Wiring Diagram……………………………………………………………….19 6. PCB Layout……………………………………………………………………20 7. Test Procedure……………………………………………………………..36 8. Exploded View & Mechanical Parts List…………………………………37 9. BOM…………………………………………………………………………….40...
Page 3: Introduction
1. Introduction MODEL NO:PBM8.250 MKII FEATURE: 2X250 Watts at 4 Ohms RMS EIAJ One stereo and one mono graphic EQ Digital effects with with 256 effects Feedback locator on both MAIN and MONITOR output 8 XLR inputs with 48 Volt phantom power...
Page 4: Specification
2. Technical Specification Mono input channels Microphone input Electronically balanced, discrete input configuration Frequency response 10Hzto55kHz,+3dB Distortion(THD&N) 0.006%at4dBu,1kHz Gain 50dB(MIC) >90dB SNR(Signal to Noise Ratio) Line input Electronically balanced Frequency response 10Hz to 55kHz, 3dB Distortion (THD&N) 0.04% at 4dBu,1kHz Gain 30dB Stereo input channels...
Page 5 Main Mix Section Noise (Bus noise) Fader 0dB, channels muted:85dBr (ref.: +4dBu) Fader 0dB,all input channels assigned and set to UNITY gain:71dBr (ref.: +4dBu) Max output +27dBu balanced, +22dBu unbalanced, 1/4" jacks AUX Sends max out +22dBu Power supply Main voltage 100VAC~60Hz 230VAC~50Hz 120VAC~60Hz 240VAC~50Hz Power Consumption...
Page 6: Block Diagram
3. Block Diagram - 4 -...
Page 7: Schematic Diagram
4. Schematic Diagram - 5 -...
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Page 21: Wiring Diagram
5.Wiring Diagram - 19 -...
Page 22 7. PBM8.AMP (PBM500, PBM8.250) BIAS Adjustment Procedure 1. Test Instruments 1) Digital multi-meter 2. Procedure and Specification 1) No signal input to CH1 (J1-11) and CH2 (J2-11): switch on the power supply on the front panel, three green LEDs will light up (D2, D1-16, and D2-16);...
Page 23: Exploded View & Mechanical Parts List
8. Exploded Views & Mechanical Parts List - 37 -...
Page 24 Part List Mechanical Parts List No. Item NO. Item Description Specification MA05516 front panel PBM8.250MKII_V1.0 HK00758 PCB semi-finished product P-PBM8-CTRL-DIP HK00759 PCB semi-finished product P-PBM8-IN-OUT-DIP NI02957 9.8*5.5*11.2 black φ10*16.5 COOL GRAY 8C NI00359 plastic knob φ11*19 COOL GRAY 8C NI00399 plastic knob φ7*3.5 072C blue NI02252...
Page 25 MI02203 fixed bracket 11*10*106.2*1.2T ND00325 EV foam 5.0T*150*20 MG00527 copper pillar M4*8 MD00444 fan cover- Ni plated 80*80(K-G08a05-4HA) MI03003 handle Φ6*63*18 ND00388 EV foam black 2.0t*88*6 MF00030 Ni washer ψ3*ψ8*0.8t MF00018 color washer ψ4*ψ10*1t MG00167 Ni screw-flat M3*10*0.5PH MB03525 rear panel PBM8.500 MI01876 fixed bracket...
Page 26: Bom
9. Bom No. Part No. Description Specification Remark 1 TD00254 transformer PT-PBM8.250_230V 2 NI00437 rubber coil φ20*φ120*2tB 3 NI01627 fixed bracket CM-19S 4 NI00252 sleeve φ4*20mm 5 NI00248 sleeve φ4*1000mm PBM8.250 MKⅡ ALTO_V1.1 6 MA05545 panel PBM8.250MK Ⅱ 7 MA05636 panel 8 MA05516 panel 1.5t*475.23*257.4_V1.2 9 MJ00088...
Page 27 φ8.5*4 534C blue 44 NI02252 knob cover φ7*3.5 072C 45 NI01147 knob cover φ7*3.5 46 NE11347 label ALTO PI 47 NH00334 cone paper 0.040*1m 48 NF00061 assurance card ALTO 49 ND00388 EV foam 2.0t*88*6_V1.0 50 NE00840 label SOLTON 51 NH00115 paper 0.045*1M...
Page 28 RLS4148 0.5A (LL-34) 117 SG00068 SMD integrated circuit 74HC14DT(SO-14)/(PHI) 118 SG00410 SMD integrated circuit IC41LV16256-35KG(SOJ40)/(ICSI) IC6 119 SG00166 SMD integrated circuit TY-2 ALTO(GMCODE:105022) 120 SG00147 SMD integrated circuit CHEF DSP(GMCODE:105022) 121 SG00037 SMD integrated circuit LD1117DT33C(TO-252) 122 HC00611 IC socket (SMD)
Page 29 No. Part No. Description Specification Remark 126 NH00221 paper 0.055*1M 127 NI00016 membrane 0.05*1M 128 AC00002 solder wire 63/37% 129 CB00166 electrolytic capacitor 100uF/16V φ6*5mm C19,C12,C5,C2,C24,C16,C21 130 HK00758 PC board P-PBM8_CTRL-DIP 131 CB00009 electrolytic capacitor 1uF/50V φ4*7mm C4,C8,C1-7,C2-7,C34,C35,C36,C3-7,C37,C 38,C4-7,C55,C5-7,C57,C6-7,C7-7,C8-7,C1-1 132 CB00199 electrolytic capacitor 10uF/25V φ4*7mm 0,C2-10,C3-10,C4-10,C5-10,C6-10,C7-10,C7...
Page 30 No. Part No. Description Specification Remark 161 HI00238 push-button switch-RS 2 stage 6P PS-9226A(NON-LOCK) S2,S3,S1-1,S2-1,S3-1,S4-1,S5-1,S6-1,S7-1, 162 HI00236 push-button switch-RS 2-stage 6P PS-9226A(SELF-LOCK) S8-1 163 SD00032 integrated circuit LM317T U8,U12,U19 164 SD00033 integrated circuit LM337SP(1.5A)(TO-220) 165 NI00863 plastic washer TO220B 166 ME00015 color nut 3m/m 167 MF00037 washer φ3.2*φ5.5*1t...
Page 31 No. Part No. Description Specification Remark RF1-1,RF1-3,RF1-4,RF2-1,RF2-3,RF2-4,R5 0,R53,R58,R61,R66,R69,R73,R78,R85,RF1 0-1,RF10-3,RF10-4,RF10-8,RF11-1,RF11-3, RF11-4,RF11-8,R1-20,R1-23,R1-25,R1-26,R 1-28,R2-20,R2-23,R2-25,R2-26,R2-28,R3-20 ,R3-23,R3-25,R3-26,R3-28,R4-20,R4-23,R4- 188 RD00038 SMD fixed resistor 1/8W 22KΩ ±5% 0805 25,R4-26,R4-28,R5-20,R5-23,R5-25,R5-26,R 5-28,R6-20,R6-23,R6-25,R6-26,R6-28,R7-20 ,R7-23,R7-26,R7-27,R7-28,R7-43,R7-46,R7- 49,R8-20,R8-23,R8-26,R8-27,R8-28,R8-43,R 8-46,R8-49,RF10-10,RF10-11,RF11-10,RF1 1-11 RF1-2,R33,R49,R54,R57,R62,R65, R70,RF7-2,RF10-2,RF10-9,R1-21, 189 RD00028 SMD fixed resistor 1/8W 5.6KΩ ±5% 0805 RF16-2,RF16-9,R2-21,R3-21,R4-21 ,R5-21,R6-21,R7-21,R7-44,R8-21,R 8-44 RF1-5,RF2-5,RF3-5,RF4-5,RF5-5,R F6-1,RF6-3,RF6-4,RF6-5,RF7-5,RF...
Page 32 No. Part No. Description Specification Remark R10,R11,R12,R18,R24,R99,R1-14, R1-16,R1-18,R1-19,R1-27,R2-14,R 2-16,R2-18,R2-19,R2-27,R3-14,R3- 16,R3-18,R3-19,R3-27,R4-14,R4-1 6,R4-18,R4-19,R4-27,R5-14,R5-16, 204 RD00032 SMD fixed resistor 1/8W 10KΩ ±5% 0805 R5-18,R5-19,R5-27,R6-14,R6-16,R 6-18,R6-19,R6-27,R7-14,R7-16,R7- 18,R7-37,R7-39,R7-41,R8-14,R8-1 6,R8-18,R8-37,R8-39,R8-41,R97,R 205 RD00033 SMD fixed resistor 1/8W 12KΩ ±5% 0805 R15,R17,R22 206 RD00009 SMD fixed resistor 1/8W 220Ω ±5% 0805 R23,R48,R101,R104,R107,R110 207 RD00480 SMD fixed resistor 1/8W 68KΩ...
Page 33 No. Part No. Description Specification Remark 233 CI00007 22PF/50V NPO C15,C13 SMD ceramic capacitor 0805 234 CI00145 0.0015uF/50V X7R ±10% SMD ceramic capacitor 0805 237 SE00011 SMD rectifier diode RLS4148 0.5A (LL-34) D2,D3,D4,D5,D6,D7 238 SF00051 transistor SST176(S6)(SOT-23)/(VISHAY) Q1,Q2 239 RD00003 SMD fixed resistor 1/8W 10Ω ±5% 0805 R1,R9,R10,R11 240 RD00032 SMD fixed resistor 1/8W 10KΩ...
Page 34 No. Part No. Description Specification Remark 275 HC00076 connector(male) 2P 2.5mm 180° J1-3,J2-3 276 HC00365 connector(male) 14P 2.54mm 180°(C03-14AG1) J10,J11 277 RA00184 fixed resistor 1/4W 100Ω M type R19,R22,R29,R32,R42,R47 278 RA00103 fixed resistor 1/2W 22Ω M type R48,R49 279 HI00246 slide switch S2,S3 2 stages 6P SS-22H23-G14(2P2T)
Page 35 323 HA01315 single terminal wiring 100 green/yellow 324 AD00012 twin adhesive 90*120mm_V1.0 325 HK05800 PC board P-PBM8AMP(PBM8.250 MKII) 326 RC00319 semi-fixed resistor B100Ω PT1030-V1B101-C1-H10 R1-16,R2-16 327 RA00722 500Ω P type R1-21,R2-21 metal-oxide-film resistor 3W 328 RA01106 10Ω RSS P type...
Page 36 No. Part No. Description Specification Remark 404 SA00257 Zener diode 1/2W 3.9V D1-13,D1-14,D2-13,D2-14 405 RA01113 fixed resistor 1/4W 10KΩ R1-2,R1-3,R2-2,R2-3,R1-28,R2-28 406 RA01328 fixed resistor 1/8W 12KΩ R1-6,R2-6,R1-37,R1-38,R2-38 407 HB01263 PBM8AMP_VER050825 F1-1,F1-01,F1-2,F1-02,F2-1,F2-01, 408 HC00064 FUSE holder JEF-503B (5.2mm) F2-2,F2-02 409 HC00365 connector(male) 14P 2.54mm 180°(C03-14AG1) 410 HC00172 connector(male) 3P 3.96mm 180°...

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