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Quad Electroacoustics QUAD 405 User Manual

Quad Electroacoustics QUAD 405
24 pages
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Œ 405
POWER AMPLIFIER
Service Data
The Acoustical Manufacturing Co. Ltd. (Œ)
Huntingdon, Cambridgeshire, PE29 6XU, England
Tel: +44(0)1480 447700 Fax: +44(0)1480 431767
www.quad-hifi.co.uk
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Quad Electroacoustics QUAD 405 Specifications

General IconGeneral
Weight8.5 kg
TypePower Amplifier
Power Output100 W per channel
Input Sensitivity0.5V
Signal-to-Noise Ratio100 dB
Speaker Load Impedance4Ω - 16Ω

Summary

CIRCUIT DESCRIPTION

TEST EQUIPMENT

DISCONNECTING CLAMP CIRCUITS

AMPLIFIER CIRCUIT TESTING

CLAMP CIRCUIT TESTING

FAULT FINDING

MODIFICATIONS TO PRINTED CIRCUIT BOARDS

Amplifier Board M 12368 iss. 5

Original configuration of the amplifier board.

Amplifier board M 12368 iss.6

Modification to the copper track layout.

Amplifier board M 12368 iss.7

Component changes and copper track reduction.

Amplifier board M 12368 iss.9

Introduction of the clamp circuit for output protection.

Amplifier board M 12368 iss. 10

Modification of copper pads for production.

Amplifier board M 12565 iss.3

Features clamp circuit and ESL voltage limiter.

Amplifier board M 12565 iss.5

Details specific to the QUAD 405-2 PCB version.

Transistor and LED Alternatives

Lists alternative components for transistors and LEDs.

CLAMP CIRCUIT

REPLACING THE CLAMP BOARD

CONVERSION OF 405 TO A MONO 180W AMPLIFIER

REMOVING THE AMPLIFIER MODULES

REPLACING THE QUAD 405 TRANSFORMER

QUAD 405-2

Assembly Diagram

QUAD 405 CIRCUIT DIAGRAM DRG No. M12333 ISS2

QUAD 405 CIRCUIT DIAGRAM DRG No. M12333 ISS3

QUAD 405 CIRCUIT DIAGRAM DRG No. M12333 ISS4

QUAD 405 CIRCUIT DIAGRAM DRG No. M12333 6

QUAD 405-2 CIRCUIT DIAGRAM DRG. NO. M12333 ISS 8

QUAD 405-2 CIRCUIT DIAGRAM M12333 ISS 10

QUAD 405-2 CIRCUIT DIAGRAM M12333 ISS 9