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Summary of Contents for Alesis RA100
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Page 1: Service Manual
ALESIS RA100 Amplifier (PA) Service Manual P/N: 8-31-0020-A... - Page 2 Your purchase of the Manual shall be for your own ultimate use and shall not be for purposes of resale or other transfer. As the owner of the copyright to the Manual, Alesis does not give you the right to copy the Manual, and you agree not to copy the Manual without the written authorization of Alesis. Alesis has no obligation to provide to you any correction of, or supplement to, the Manual, or any new or superseding version thereof.
- Page 3 ALL REPAIRS DONE BY ANY ENTITY OTHER THAN AN AUTHORIZED ALESIS SERVICE CENTER SHALL BE SOLELY THE RESPONSIBILITY OF THAT ENTITY, AND ALESIS SHALL HAVE NO LIABILITY TO THAT ENTITY OR TO ANY OTHER PARTY FOR ANY REPAIRS BY THAT ENTITY.
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Page 4: Safety Instructions
Safety Instructions Carefully read the applicable items of the operating instructions and these safety suggestions before using this product. Use extra care to follow the warnings written on the product itself and in the operating instructions. Keep the operating instructions and safety suggestions for reference in the future. 1. - Page 5 The input signal drives QX15 (one half of a diff amp pair; consisting of transistors QX15 and QX16). QX16 is driven by a feedback signal from the output section through a 39K resistor (RX30). This 39K resistor is used to match the impedance seen at the base of QX15 so that the voltage at the base of both transistors is approximately 0.1V.
- Page 6 The first stage drives a second diff amp pair that is used to drive the output stage. This is where the clip indicator is connected. As QX12 and QX13 are being turned on and off, there is a constant current being delivered through RX27. This current sets up a voltage drop of about 0.45V that is seen at the base of QX14.
- Page 7 inductor then acts like a short around RX44. This protects the speakers from being damaged if the unit is on with the volume controls turned up.
- Page 8 ALESIS RA100 Amplifier (PA) SCHEMATIC FILES...
- Page 10 ALESIS RA100 Amplifier (PA)
- Page 11 GROUP DESCRIPTION ALPARTNO QTYPER POSITION MANUFACT NOTES AMP MODULE W \ HEATSINK 8-20-0028 REPLACEMENT ASSEMBLY 100 MF ELEC 6.3V 6x11mm 1-07-0100 C101,105,201,205 6x11mm/0.1 47 MF ELEC 25V 6x11mm 1-09-0476 C108,113,208,213 6x11mm/0.1 1.0 MF ELEC 50V 5x11mm 1-11-0105 C103,115,203,215 5x11mm/0.1 2.2 MF ELEC 50V 5x11mm 1-11-0225 C109,209 5x11mm/0.1...
- Page 12 PUSH CLP CONN 2 CTR BLK 4-08-0001 INOUT IEC320 CONN/FUSE HLDR 4-09-0001 1N4148 100V DIODE 2-00-4148 D101-113,201-213 0.4 SPC 1N4002 200V DIODE 2-01-4002 0.5 SPC TRANS, MPSA42 2-03-1042 Q112,113,117,212,213,217 TO92/0.1 TRANS, 2SC4382 2-03-4382 Q105,205 SANKEN TO220/0.1 TRANS, MPS8099 2-03-8099 Q104,106,110,114,204,206,210,214 TO92/0.1 TRANS, MPSA92 2-04-1092...
- Page 13 10KA SINGLE 0-09-1005 R145,245 OHM 1/4W 5% 0-03-0000 0.4 SPC OHM 1/4W 5% 0-03-0101 R101,119,121,122,127,133,134,201,219,221,222,227,233,234 0.4 SPC OHM 1/4W 5% 0-03-0102 R129,229 0.4 SPC OHM 1/4W 5% 0-03-0103 R104,116,135,136,138,141,204,216,235,236,238,241 0.4 SPC 100K OHM 1/4W 5% 0-03-0104 R142,242 0.4 SPC 1.1K OHM 1/4W 5% 0-03-0112 R140,240 0.4 SPC...
- Page 14 WIRE, POWER CONN TERM 9-89-0008 FEM SPADE-TERM 20 GA WIRE, POWER CONN RING 9-89-0009 FEM SPADE-RING 20 GA WIRE, POWER SWITCH 9-89-0010 FEM SPADE-FEM SPADE 20 GA WIRE, LED RIGHT 9-89-0011 TERM PIN-TERM PIN 20 GA WIRE, LED LEFT 9-89-0012 TERM PIN-TERM PIN 20 GA...
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