Amc cdm 7 laser adjustment en
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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.
l'lll'llrrr;iirrrrrl\
Nil
(151
V:
RF SIGNAL
\llllllllllllllllllllllll
\\ lll
LASER CURRENT ADJUSTMENT:
l
l l,696.6%.3626.0WlVllllltllllll
The integrated circuitry used in the CD PCB eliminate the need for most adjustments by incorporating
_¢_u_ 3AA, _ _ A»;33.0.0_t,A_¢,A_¢.t,o,b.g¢.a,ga_
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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