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Arcam Alpha cd player User Manual

Arcam Alpha cd player
32 pages
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Table of Contents

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Arcam Alpha cd player Specifications

General IconGeneral
TypeCD Player
Dynamic Range95dB
Channel Separation90dB
Output Level2V RMS
Power Consumption15W

Summary

CIRCUIT DESCRIPTION

Audio Board

Describes the audio board's components and function, including DAC and output stages.

Main Board (brief description)

Detail measuring method

uP IC6530 ZC99685P

Details test points and signal frequencies for the ZC99685P microcontroller.

Check of Q channel signals

FILTER IC6541 SAA7220P/B (B-chip)

Covers test points and signal checks for the SAA7220P/B filter chip, including subcode clocks.

Check of timing signals between B chip and DAC

REMOVAL OF MAIN PCB

ALPHA CD PLAYER SERVICE NOTE 1 8/12/89

ALPHA CD SERVICE NOTE 2 (2/3/90)

CHECK OF LASER CURRENT AND FOCUS OFFSET ON THE ALPHA CD PLAYER

Provides procedures for checking and adjusting laser current and focus offset.

Laser adjustment

Details the procedure for adjusting the laser current via resistor 3501 to 50mV DC.

Focus offset adjustment

Explains how to adjust the focus offset to +400mV using a 22K preset.

CHANGE OF MAINS VOLTAGE

BOARD MODIFICATIONS

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