LEM Amp 2.4 Service Manual

Stereo power amplifier

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SERVICE MANUAL

Index
2
4
5

Warnings

Address
L CODE: 270232M
Technical Specifications, Introduction, Test Procedures & Adjustments
Schematic Diagrams
Layout & Spare Part List
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 Amp 2.4

  • Page 1: Service Manual

    Index Technical Specifications, Introduction, Test Procedures & Adjustments Schematic Diagrams Layout & Spare Part List Warnings 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. ✔...
  • Page 2 Before proceed to supply the amplifier check visually the internal assem- CN3 pin 3 =-15±1Vdc TECHNICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS bly, if appears an evident damage find the most possible reasons that If one or more voltages don’t correspond, check the rectifiers, capacitors cause it.
  • Page 3 on the amplifier, connect temporarily (by means of a suitable conductor one leg of each emitter pin and measure the emitter-collector resistance Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 wire) CN2 pin 2 to +15Vdc (CN3 pin 5), the PROTECT led must turn on in on each device.
  • Page 4 ❏ ❏ ❏ ❏ ❏ 4 4 4 4 4...
  • Page 5 OUTPUTS INPUTS DESIGNED AND MOD. MADE ENGINEERED IN ITALY SER. CHINA MIN. LOAD 8 STEREO CH. A CH. B EARTH MODE 030247 10u 25V 20% Vert Electrolytic Bipolar Capacitor Spare Part List Spare Part List Spare Part List Spare Part List Spare Part List 340750 TO126 Mica Washer...

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