JVC xm-px50wt Manuel D’Utilisation

XM-PX50WT

1-12

Turn off the power switch and,disconnect the
power cord from the ac outlet.

Replace the pickup with a normal one.(Refer 
to "Pickup Removal" on the previous page)

Plug the power cord in,and turn the power on.
At this time,check that the laser emits for 
about 3seconds and the objective lens moves 
up and down.
Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at TP1.

Finish.

(1)  Cleaning the pick up lens
     Before you replace the pick up, please try to 
     clean the lens with a alcohol soaked cotton 
     swab. 

(2)  Life of the laser diode 
     When the life of the laser diode has expired,
     the following symptoms will appear.
    
   1. The level of RF output (EFM  output:ampli 
        tude of eye pattern) will below.
 

Is the level of

RFOUT under

0.35Vp-p?

Replace  it.

NO

YES

O.K

(3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is
    attached to the pickup is used to adjust the laser power.Since this adjustment should be performed to match the 
    characteristics of the whole optical block, do not touch the semi-fixed resistor.
    If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should
    be replaced.
    If the semi-fixed resistor is adjusted while the pickup is functioning normally,the laser pickup may be damaged
    due to excessive current.