Pioneer DVH-3900MP/XZ/EW5 Service Manual page 3

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Additional Laser Caution
Transistors Q1101 in PCB drive the laser diodes for DVD and CD respectively.
When Q1101 is shorted between their terminals, the laser diodes for DVD or
CD will radiate beam. If the top cover is removed with no disc loaded while
such short-circuit is continued, the naked eyes may be exposed to the laser
beam.
Danger of explosion if battery is incorrectly replaced.
Replaced only with the same or equivalent type recommended by the manufacture.
Discord used batteries according to the manufacture's instructions.
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