JVC FS-SD5 - FS-SD7 - FS-SD9 - REPLACEMENT OF LASER PICKUP

LASER PICKUP REPLACEMENT

Cleaning the pick up lens

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

Life of the laser diode

When the life of the laser diode has expired, the following symptoms will appear.

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.

REPLACEMENT OF LASER PICKUP

FLOW OF FUNCTIONAL OPERATION UNTIL TOC READ [Click on chart to Enlarge]

CONNECTING METHOD

When the KSM-770ABA mechanism is used, the expansion cable is used as follows.

First short-circuit the pickup circuit before removing the pickup. Then carry out the replacement.

KSM-770ABA

Disassemble procedure is given by previous post here.