Amc cdm 7 laser adjustment en

Page 1

AMC CDM7
LASER ADJUSTMENT PROCEDURE

ADJUSTMENT POINTS DIAGRAM:

/ R
:1
E2] U101.
uno
) U107
[151
4+.
U1 or
U10? u103
uros R127 F
\ L333: ADJ.

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Nil

(151

V:
RF SIGNAL

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LASER CURRENT ADJUSTMENT:

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The integrated circuitry used in the CD PCB eliminate the need for most adjustments by incorporating

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self adjusting circuitry. However, when parts in the servo circuitry or CD mechanism are replaced, a
laser current adjustment should be performed. Please follow the steps below:
1. Insert the test disc (Sony Type 4, YEDS 18).
2. Make sure the power is turned OFF.
3. Connect a high impedance voltmeter across the test points labelled LASER ADJ.
4. Turn the power ON and press the Play button.
5. When track 1 starts playing, adjust R127 to 50mv +/-2mV specification.

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