manualshive.com logo in svg

Alto PBM8.250 MKII, Service Manual, Page: 1 / 36

Share
Download
Alto PBM8.250 MKII Service Manual Download Page 1

                                        www.altoproaudio.com

                                                           

Version 1.0

   

MODEL:

 PBM8.250 MKII

PBM8.500 MKII

Summary of Contents for PBM8.250 MKII

Page 1: ...www altoproaudio com Version 1 0 MODEL PBM8 250 MKII PBM8 500 MKII...

Page 2: ...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: ...e XLR input Two stereo channels Stereo or Monitor Main mode RCA L R tape in and L R tape out MODEL NO PBM8 500 MKII FEATURE 2X250 Watts at 4 Ohms RMS EIAJ One stereo and one mono graphic EQ Digital ef...

Page 4: ...N 0 006 at 4dBu 1kHz Impedances Microphone input 1 4kOhm Stereo return 2 5kOhm All other inputs 10kOhm or greater Tape out 1kOhm All other output 120 Ohm Equalization Hi shelving 15dB 12kHz Mid bell...

Page 5: ...Main voltage 100VAC 60Hz 230VAC 50Hz 120VAC 60Hz 240VAC 50Hz Power Consumption PBM8 250MKII Stereo mode 250W 4ohm 190W 8ohm Bridge mode 500W 8ohm 300W 8ohm Bridge mode 1000W 8ohm Fuse PBM8 250MKII 100...

Page 6: ...7 8 A B C D 8 7 6 5 4 3 2 1 D C B A 2 1 3 MAIN L DFX DSP MONITOR 2 1 3 MAIN L DFX DSP MONITOR MAIN R MAIN R A A 1 2 1 2 LEFT SPEAKON 1 2 1 2 RIGHT SPEAKON MAIN MAIN MONITOR MONITOR BRIDGE BRIDGE 3 Bl...

Page 7: ...0K R5_25 22K R5_4 B50K R5_20 22K PAD 20dB HIGH CH MID CH LOW LEVEL MON AUX1 PRE DSP FX AUX2 POST PAN POT U5_2C NJM4580M C5_11 100N C5_13 100N U5_1C NJM4580M C5_12 100N C5_14 100N R6_9 180R S6_1A SW PS...

Page 8: ..._13 100R 1 8W CF16_3 1N RF16_8 100K RF16_9 5K6 RF16_10 100K RF16_11 100K CF16_4 1N RF16_12 18K GND MAIN LED1 8KHz FREQUENCY BAND UF13A NJM4580M UF13B NJM4580M CF17_1 1N RF17_1 56K RF17_2 3K3 CF17_2 1N...

Page 9: ...7 U3B NJM4580M R30 33K C9 22P MONITOR LEVEL R27 B50K R32 33K C11 22P U2B NJM4580M R34 56K C12 22P U3A NJM4580M C13 47uF 25V R33 5K6 S2A SW PS 22E85L 3 S2B SW PS 22E85L 3 GND MAIN LED PUSH 2C_2P SWITCH...

Page 10: ...C41 1000uF 35V C42 1000uF 35V R31 0R C43 33uF 100V D18 BRIDGE 1 5A 200V C44 33uF 100V C48 100uF 100V C49 100uF 100V C45 100N C46 100N D19 1N4004 C47 220uF 35V D20 1N4004 R111 3K9 1 2W D21 3mm GREEN L...

Page 11: ...EMALE CH5 INPUT C5_1 47uF 63V R5_4 2K2 R5_1 6K8 R5_2 10K R5_3 6K8 PHANTOM C5_2 47uF 63V R5_5 2K2 3c 5e 1a 4d 2b J5_2 90STEREO JACK R5_6 22K C5_4 10uF 25V R5_8 2K2 R5_7 22K C5_3 10uF 25V R5_9 2K2 C5_5...

Page 12: ...4580M HEADPHONES R48 22R 1 2W 17V_HEAD C22 47uF 25V C23 100n R49 22R 1 2W 17V_HEAD C24 47uF 25V C25 100n TAPE IN 10dBV DUAL RCA STEREO CONNECTOR 3 2 1 U6A NJM4580M R15 5K6 L_BUS R17 6K8 R16 10K C9 22P...

Page 13: ...1 2 1 2 1 2 1 2 3 2 1 8 4 PIN 8 PIN 7 1 2 1 2 1 2 1 2 1 2 1 2 3 2 1 8 4 5 6 7 8 4 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 PIN 9 1 2 1 2 1 2 1 2 PIN 10 PIN 11 PIN 12 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1...

Page 14: ...1 2 3 4 A B C D 4 3 2 1 D C B A 1 1 2 2 SPK1 SPEAKON J1 L J2 L 1 1 2 2 SPK2 SPEAKON J3 R J4 R 3c 5e 1a 4d 2b X2 JY 6351G 02 250 3c 5e 1a 4d 2b X1 JY 6351G 02 250...

Page 15: ...TC 100R 1 5A 200V 12V 12V C4 470uF 35V C5 470uF 35V 1 2 R5 0R 1 2 R4 3K3 D2 3mm GREEN LED POWER ON LED C6 10uF 50 1 2 3 J3 CON3 1 2 3 4 5 6 7 8 9 10 J1 HEADER 5X2 CH1 INSERT OUT CH1 INSERT IN CH2 INSE...

Page 16: ...3 4 5 6 7 8 9 10 11 12 13 14 J4 HEADER 7X2 GND1 GND1 L1_1 2uH 10A R1_26 5R6 2W R1_22 10R 3W C1_2 100nF 250V poly GND1 CH1 OUTPUT 1 1 GND1 TO SPEAKON PCB R1_36 120K C1_1 47uF 100V D1_2 1N4004 R1_39 PTC...

Page 17: ...7 1 8W D2_9 W2 04 GND1 R2_25 47R 4 1 2 3 U2_2 VTL5C2 GND1 FTR VT90N1 VACTEC GND1 CH2 INSERT OUT CH2 INSERT IN L2_1 2uH 10A R2_26 5R6 2W R2_22 10R 3W C2_2 100nF 250V poly GND1 CH1 OUTPUT 1 1 GND1 TO SP...

Page 18: ...CH1 INSERT IN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 J4 HEADER 7X2 GND1 GND1 L1_1 2uH 10A R1_26 5R6 2W R1_22 10R 3W C1_2 100nF 250V poly GND1 CH1 OUTPUT 1 1 GND1 TO SPEAKON PCB R1_36 120K C1_1 47uF 100V D1...

Page 19: ...2 4K7 1 8W R2_41 4K7 1 8W D2_9 W2 04 GND1 R2_25 47R 4 1 2 3 U2_2 VTL5C2 GND1 FTR VT90N1 VACTEC GND1 CH2 INSERT OUT CH2 INSERT IN L2_1 2uH 10A R2_26 5R6 2W R2_22 10R 3W C2_2 100nF 250V poly GND1 CH1 OU...

Page 20: ......

Page 21: ...2 3 4 5 6 A B C D 6 5 4 3 2 1 D C B A QCN9 361NLJJ QCN9 611NLJJ AC SOCKET AC SW 1 2 3 1 2 3 J2 3 1 2 3 J2 1 2 3 J1_3 1 2 J1_4 J1_5 1 2 J3 1 2 J2_4 J2_5 1 2 J1_11 1 2 J2_11 1 2 J CON2 1 2 J CON2 1 2 3...

Page 22: ...1 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 moreover D1 4 and D2 4 will light up dimly Measure R1 11 R2 11 15V R2 12 R1 12 15V by...

Page 23: ......

Page 24: ...d screw iron board flat M3 16 40 15 MG00041 black plated screw pill M3 6 34 16 MG00061 black plated screw iron board pill M3 10 17 17 MF00061 MIC socket washer circle 1G 02 250 19 18 ME00060 MIC socke...

Page 25: ...6 42 MG00167 Ni screw flat M3 10 0 5PH 6 43 MB03525 rear panel PBM8 500 1 44 MI01876 fixed bracket PBM 8 1 5t 170 96 5 16 5 1 45 TD00255 loop transformer PT PBM8 500_230V 1 46 MG00526 Zn screw T squar...

Page 26: ...0127 color screw M4 8 19 NI03760 rear cover 553 3 275 6 208 PBM8 250 MK black_V1 0 20 MI03003 handle PBM8 250 MK 6 63 18_V1 0 21 NB04045 cushion PBM8 500MK _V1 0 22 NB04087 gift carton PBM8 250 MK ALT...

Page 27: ...board 1 5 2135 1220 30 67kg 61 MI02121 separating shade PBM 8_V1 0 62 MJ00999 AL plate RS 1 2000 1000 5 44kg 63 MI02128 fixed bracket PBM 8 L type_V1 0 64 MI02129 fixed bracket PBM 8 L type_V1 0 65 M...

Page 28: ...ramic capacitor 0603 0 1uF 50V Y5V 80 20 C17 C15 C18 C6 C10 C22 C20 C13 C14 C1 C3 C4 C11 108 RD00061 SMD fixed resistor 1 10W 10 5 0603 R22 109 RD00068 SMD fixed resistor 1 10W 100 5 0603 R12 R14 R7 R...

Page 29: ...D22 144 SA00052 L E D 3 round green long foot 26 D3 D4 D8 D9 D13 D14 D21 145 SA00054 L E D 3m m round yellow long foot 26 D5 D10 D15 146 NI01786 LED spacer support LEDS 12 12mm 147 SA00167 bridge rect...

Page 30: ...1 CF7 2 C7 3 CF8 1 CF8 2 C8 3 CF9 1 C F9 2 CF16 1 CF16 2 CF16 3 CF16 4 C F17 1 CF17 2 CF17 3 CF17 4 CF18 1 CF18 2 CF18 3 CF18 4 C7 13 C8 13 179 CI00007 SMD ceramic capacitor 0805 22PF 50V NPO C2 C3 C...

Page 31: ...8 3 RF8 4 RF12 1 RF12 3 RF12 4 RF12 8 RF17 1 RF17 3 R F17 4 RF17 8 RF12 10 RF12 11 R F17 10 RF17 11 R34 193 RD00025 SMD fixed resistor 1 8W 3 3K 5 0805 RF3 2 RF8 2 RF12 2 RF12 9 RF17 2 RF17 9 194 RD00...

Page 32: ...5 0805 R1 17 R2 17 R3 17 R4 17 R5 17 R 6 17 R7 17 R7 40 R8 17 R8 40 215 RD00027 SMD fixed resistor 1 8W 4 7K 5 0805 R1 24 R2 24 R3 24 R4 24 R5 24 R 6 24 R7 24 R7 47 R8 47 R8 24 216 RD00051 SMD fixed r...

Page 33: ...C14DT SO 14 PHI U5 256 SG00164 SMD integrated circuit 74HC109D U6 257 AE00221 tin soldering paste SJ 617 258 AC00002 solder wire 63 37 259 RA00157 fixed resistor 1 4W 0 0 R31 260 CB00050 electrolytic...

Page 34: ...d resistor 1 8W 6 8K 5 0805 R1 1 R1 3 R17 R2 1 R2 3 R26 R3 1 R3 3 R4 1 R4 3 R5 1 R5 3 R6 1 R6 3 R7 1 R7 2 R8 1 R8 2 291 RD00023 SMD fixed resistor 1 8W 2 2K 5 0805 R1 4 R1 5 R1 8 R1 9 R2 4 R2 5 R2 8 R...

Page 35: ...P type R1 23 R1 24 R2 23 R2 24 333 RA00063 metal oxide film resistor 3W 1 5K RSS P type R1 11 R1 12 R2 11 R2 12 334 SB00130 transistor MPSA42 PHILIPS Q1 6 Q2 6 335 SB00129 transistor MPSA92 TO92 PHI...

Page 36: ...80 J1 414 HC00324 connect terminal 6 5m m PC250 J1 4 J1 5 J2 4 J2 5 415 HC00034 short circuit connector NO 2700 2 54mm 6mm OPEN 416 CF00033 metal film capacitor MEF 0 1uF 250V C1 2 C2 2 417 CB00009 el...

Reviews:

No comments