LEM Avalon AV12-4 Service Manual

Avalon series

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SERVICE MANUAL

Index

2
2
AV12-4, AV12-8, AV15-4, AV15-8, AV15S Passive Versions Schematic Diagrams
3
AV12-4, AV12-8, AV15-4, AV15-8, AV15S Passive Versions Spare Part List
3
AV12A, AV15A, AV15SA Block Diagrams
4
AV12A Test Procedures & Adjustment
5
AV15A Test Procedures & Adjustment
5
AV15SA Test Procedures & Adjustment
7
AV12A Schematic Diagram
8
AV15A Schematic Diagram
9
AV15SA Schematic Diagram
10
AV12A, AV15A, AV15SA Active Version Spare Part List

Warnings

Address
CODE: 270241
Notice
Service must be carried out by qualified personnel only.Any tampering carried out by unqualified personnel during the guarantee period
will forfeit the right to guarantee.
For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.
To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.
All components marked by this symbol have special safety characteristics, when replacing any of these components use only
manufacturer's specified parts.
The (µ) micro symbol of capacitance value is substituted by U.
The (Ω) omega symbol of resistance value is substituted by E.
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
All resistors are 1/8Ω unless otherwise specified.
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.
Soldering point.
Supply voltage.
Male connector.
Test point.
Female connector.
Flag joined with one or more flags
M/F faston connector.
with the same signal name inscribed.
ATTENTION
Observe precautions when handling electrostatic sensitive devices.
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12 - tel. 0541/959511 - fax 0541/957404
GENERALMUSIC on the NET: http://www.generalmusic.com
Logic supply ground.
Analog supply ground.
Chassis ground.
Earth ground.
1 1 1 1 1

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Summary of Contents for LEM Avalon AV12-4

  • Page 1 Index Technical Specifications AV12-4, AV12-8, AV15-4, AV15-8, AV15S Passive Versions Schematic Diagrams AV12-4, AV12-8, AV15-4, AV15-8, AV15S Passive Versions Spare Part List AV12A, AV15A, AV15SA Block Diagrams AV12A Test Procedures & Adjustment AV15A Test Procedures & Adjustment AV15SA Test Procedures & Adjustment AV12A Schematic Diagram AV15A Schematic Diagram AV15SA Schematic Diagram...
  • Page 2 AVALON TECHNICAL SPECIFICATIONS AV-12 AV-15 AV-15S LOUDSPEAKER SPECIFICATIONS High 1" tweeter with phasing 1" compression driver COMPONENTS plug and EWT horn with EWT horn 12" woofer 15" woofer 15" woofer POWER HANDLING W continuous (EIA RS-426A) W peak IMPEDANCE Ohms 4 / 8 4 / 8 5 kHz...
  • Page 3 227059 227059 227059 227059 227059 15" 8ohm Woofer Speaker 15" 8ohm Woofer Speaker 15" 8ohm Woofer Speaker 15" 8ohm Woofer Speaker 15" 8ohm Woofer Speaker Spare Part List (PASSIVE VERSIONS) Spare Part List (PASSIVE VERSIONS) Spare Part List (PASSIVE VERSIONS) Spare Part List (PASSIVE VERSIONS) Spare Part List (PASSIVE VERSIONS) 210242...
  • Page 4 Output Power*: (4Ω) 200W TEST PROCEDURES & ADJUSTMENTS TEST PROCEDURES & ADJUSTMENTS TEST PROCEDURES & ADJUSTMENTS TEST PROCEDURES & ADJUSTMENTS TEST PROCEDURES & ADJUSTMENTS Channels Check Channels Check Channels Check Channels Check Channels Check Max. Undistorted Out*: (4Ω) 80Vpp These procedures are relative to the ACTIVE versions (amplified loudspeakers) Verify, with the Multimeter, the insulation between the heatsink and the Sensitivity: (1W/1m)
  • Page 5 Disconnect the audio generator and short the input (pin 1,2,3 of XLR socket If the protection trips, turn off the amplifier, wait some minutes and disconnect BANDWIDTH CHECK: BANDWIDTH CHECK: BANDWIDTH CHECK: BANDWIDTH CHECK: BANDWIDTH CHECK: shorted) the output signal (noise) must be less than 1mV. the supplies from the amplifier module (CN2, CN3 on AMPLIFIER board), Switch alternatively the generator frequency to 100Hz and 10kHz, no level continue to check the supplies.
  • Page 6 Set the generator level at -10dB (0,245V ), adjust the trimmer VR1 on If the high rails appear distorted or are not modulating as shown in figure, then Supply Check Supply Check Supply Check Supply Check Supply Check CONTROLS & CROSSOVER board to obtain an output level of 19Vp the problem probably exists somewhere in the circuitry of the respective (+ (13.4V or -) defective high rail.
  • Page 7 7 7 7 7 7...
  • Page 8 8 8 8 8 8...
  • Page 9 9 9 9 9 9...
  • Page 10 110614 Mains Socket 030715 1000u 6v3 20% Vert Electrolytic Capacitor 140872 4 Contatcs Hor Male Connector Spare Part List (ACTIVE VERSIONS) Spare Part List (ACTIVE VERSIONS) Spare Part List (ACTIVE VERSIONS) Spare Part List (ACTIVE VERSIONS) Spare Part List (ACTIVE VERSIONS) 110291 Power Switch 340783...

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